a BTU is defined as the amount of energy required to raise the temperature of one lb of water by one degree celsius.T/F

Answers

Answer 1

A BTU is the amount of energy required to raise the temperature of one pound of water by one degree Celsius: False

The energy needed to raise the temperature of one pound of water by one degree Fahrenheit is known as a BTU.

British thermal units are used to assess the capacity of the majority of air conditioners (BTU). One pound (0.45 kilos) of water needs one BTU of heat to increase its temperature by one degree Fahrenheit (0.56 degrees Celsius). One tonne is 12,000 BTU in terms of heating and cooling.

Heat is measured in British thermal units. One BTU is about 1055 joules (J), the joule being the current SI unit for heat energy.  This represents the fact that the temperature change of a mass of water caused by the injection of a particular quantity of heat (measured in energy units, often joules) varies somewhat depending upon the water's beginning temperature.

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Related Questions

So the Fahrenheit scale has 180 divisions. But its highest temperature is 212. Im kinda confused..... what is the purpose of divisions??

Answers

Answer:

The melting and boiling point of water in Fahrenheit scale is divided into 180 equal intervals, that means each division denoting 1°F.

division means their melting and boiling point is divided into 180 equal intervals that means each division indicates 1 degree F.

To do work, this truck uses energy stored in chemical fuel and an electrical battery. An illustration of truck with a wide arrow away from it labeled input energy? J and it splits into 3 arrows labeled kinetic energy 400 J, heat 250 J, and friction 150 J. How much total energy does this truck put out? 50 J 250 J 400 J 800 J
I think it may be 800 J.

Answers

Answer:

(d)

Explanation:

I took the test

Total energy does this truck put out is 800 joule.

What is energy?

Energy is the ability or capability to do tasks, such as the ability to move an item (of a certain mass) by exerting force. Energy can exist in many different forms, including electrical, mechanical, chemical, thermal, or nuclear, and it can change its form.

Given in question energy split into 3 arrows labeled kinetic energy 400 J, heat 250 J, and friction 150 J. Total energy does this truck put out is 800 joule.

Total energy does this truck put out is 800 joule.

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4. Compare reflecting telescopes and refracting
telescopes.

Answers

A reflecting will have a mirror on the bottom where the light will bounce off a retracting uses lenses that focus the light

if a parallel circuit has three loads of equal resistance and a voltage of 120 v is applied to the circuit, what will the voltage drop be across each load?

Answers

Since load are connected in parallel so the voltage drop across each load will be 120 v.

Voltage and current are dependent on each other. In case of parallel connection, current gets divided in the circuit.

If all 3 loads are of equal resistance then R1=R2=R3=R.

so the equivalent resistance in parallel is = R/3

now the current supplied by the source is I = V/Req

I = 120/(R/3)

I = 360/R

Now since the load is equal so current also gets distributed equal.

So, the voltage drop across resistor would be Vr = (I/3)*R

putting the values of I, we get

Vr = 360R/3R

Vr = 120

Hence the voltage across the resistors is 120 V

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Explain You pull open a door. If the force
the door exerts on you is equal to the
force you exert on the door, why do you
not move?

Answers

Explanation: the force of the door on your hand is not the same as just the force of your hand

A rock is thrown horizontally from the top of a 494.9 m high cliff on Earth near sea level with an initial velocity of 27.6. The ground below the cliff is level. How long, in seconds, will it take the rock to hit the ground below the cliff? Enter your answer at least to the nearest tenth of a second, but do not include units in your answer.​

Answers

Answer:

Time 10.0 s

Explanation:

Given:

H = 494.9 m

V = 27.6 m/s

g = 9.8 m/s²

___________

t - ?

The fall time is found from the formula:

H = g·t² / 2

t = √ (2·H / g) = √ (2·494.9 / 9.8 ) ≈ 10.0 s

Attention! An extra given is speed. Find the distance from the base of the rock to the point where the stone fell:

L = V·t = 27.6·10.0 = 276 m

which of the following is not involved in hitting a tennis ball?
a. kinetic energy.
b. chemical potential energy.
c. gravitational potential energy.
d. elastic potential energy.

Answers

B. Chemical potential energy is not involved in hitting a tennis ball.

When hitting a tennis ball, the kinetic energy of the racquet is transferred to the ball, causing it to move. The kinetic energy of the racquet comes from the work done by the player, which may involve converting chemical potential energy stored in food into kinetic energy. However, the chemical potential energy is not directly involved in hitting the ball.

In addition, the other three options (kinetic energy, gravitational potential energy, and elastic potential energy) are all involved in hitting a tennis ball. The kinetic energy of the ball and racquet are important in causing the ball to move, the gravitational potential energy may affect the trajectory of the ball, and the elastic potential energy stored in the racquet and ball may be converted to kinetic energy upon impact.

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For a stirred tank that is cooled by a water coil, what is the consequences of neglecting coll dynamics? a • Thermal capacitance of the collis neglected with respect to the tank wall and the tank liquid • Energy balance is done only on the tank wall Ob • Thermal capacitance of the collis neglected with respect to the tank wall and the tank liquid • Energy balance is done only on the tank liquid oc • Thermal capacitance of the collis neglected with respect to the tank wall and the tank liquid

Answers

The thermal capacitance of the coil is neglected with respect to the tank wall and the tank liquid. Energy balance is done only on the tank liquid. Option C is the correct answer.

The consequence of neglecting the thermal dynamics of the cooling coil in a stirred tank can vary depending on the specific situation and the magnitude of the neglected effects. However, in general, neglecting the thermal capacitance of the cooling coil in relation to the tank wall and the tank liquid can have the following consequences:

Inaccurate temperature predictions: Neglecting the thermal capacitance of the cooling coil means that the cooling effect provided by the coil will not be properly accounted for in the energy balance of the system. This can lead to inaccurate temperature predictions within the tank. The coil may cool the tank contents faster or slower than anticipated, leading to deviations from the desired temperature profile.Inefficient cooling: Neglecting the thermal capacitance of the coil implies that the cooling coil is assumed to have an instantaneous cooling effect, without considering its own thermal inertia. This can result in inefficient cooling as the coil may not be able to transfer heat effectively to the cooling water due to the lack of thermal capacitance consideration. Consequently, the cooling process may be slower or less efficient than expected.Risk of equipment failure: If the cooling coil is subjected to rapid temperature changes due to neglecting its thermal capacitance, it can potentially lead to thermal stress and mechanical failure of the coil. The coil may not be designed to handle abrupt temperature variations, which can result in damage or reduced lifespan of the equipment.Energy consumption discrepancies: Neglecting the thermal capacitance of the coil can affect the overall energy balance calculations for the system. The energy required to operate the cooling coil may be underestimated, leading to discrepancies in energy consumption estimations. This can have implications for energy management and cost considerations.

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Brandon is flying in a spaceship past Earth at 0.9c and turns on the headlights. Mary watches from Earth, which we can assume is at rest. Each person measures how fast the light appears to be traveling. Who would measure what? A. Mary greater than c, Brandon greater than c B. Mary greater than c, Brandon equal to c C. Mary greater than c, Brandon less than c D. Mary equal to c, Brandon greater than c E. Mary equal to c, Brandon equal to c F. Mary equal to c, Brandon less than c G. Mary less than c, Brandon greater than c H. Mary less than c, Brandon equal to c I. Mary less than c, Brandon less than c

Answers

The measurement by a person would be E. Mary equal to c, Brandon equal to c

Both Mary and Brandon would measure the speed of light as c (the speed of light in a vacuum, approximately 299,792 km/s). This is because the speed of light is constant for all observers, regardless of their relative velocities, according to the theory of special relativity.

As a consequence of this principle, if Mary and Brandon are both moving at different velocities relative to each other, they would still measure the speed of light as c. This is true regardless of their motion or the direction from which they measure the light.

It means that no matter how fast or in which direction Mary or Brandon are moving, the speed of light would always appear to be the same for both of them.

This phenomenon has been experimentally confirmed through various experiments and observations, and it is a fundamental principle in our understanding of the nature of space and time.

The constancy of the speed of light is one of the key insights that led to the development of Einstein's theory of relativity and has significant implications for our understanding of the universe.

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Determine the average emissivity of the surface and the rate of radiation emission from the surface, in W/m2.

Answers

The average emissivity of the surface and rate of radiation emission in W/m2 can be calculated using relevant formulas.

The emissivity of a surface is a measure of its ability to emit thermal radiation.

To determine the average emissivity of a surface, the ratio of the actual radiation emitted by the surface to that emitted by a blackbody at the same temperature must be calculated.

The rate of radiation emission from the surface can be determined by multiplying the Stefan-Boltzmann constant by the emissivity of the surface and the fourth power of its temperature.

This will give the rate of energy emitted per unit area of the surface. The resulting value is expressed in watts per square meter (W/m2).

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How far can a mother push a 20.0 kg baby carriage, using a force of 62 N, if she can only do 2920 J of work?

Answers

Please find attached photograph for your answer.

Hope it helps.

One thing I have to mention is that here we do not need to calculate the mass because the amount of force is already given.

Please do comment if you have any query.

How far can a mother push a 20.0 kg baby carriage, using a force of 62 N, if she can only do 2920 J of

Increased levels of oxygen in the atmosphere due to photosynthesis caused rates of weathering to____
which aided in the formation of____
1. A.Increase
B. Decrease
C. Remain constant

2. A. Chloroplast
B. Roots
C. Soil

Answers

1. A:Increase
2. C: Soil

Increased levels of oxygen in the atmosphere due to photosynthesis caused rates of weathering to increases which aided in the formation of soil.

What is photosynthesis ?

The process in which use of solar energy occur by  plants, algae and certain bacteria convert them into chemical energy and starch called as photosynthesis.

Photosynthesis occur in chloroplast of the green plant which has its own DNA, genes and synthesize their own proteins.

photosynthetic Pigments are also involve in this process which is responsible for trapping sunlight present in chlorophyll pigment of chloroplast, like chlorophyll a, b and c.

some of the Bacteria have chlorophyll known as bacteriochlorophyll which can absorb infrared rays, Carotenoids which are yellow, orange or red-coloured pigments that absorb bluish-green light., Xanthophyll, Phycobilins.

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How long will it take a 50W heater to melt 2KG of ice at 0degree Celiu. Pecific latent heat of fuion of ice = 335000J/KG

Answers

The 50 W heater needs 13400 seconds to melt the material.

Equation:

t = mC/P

where t = Time and m = Ice Mass

C stands for the ice's specific latent heat of fusion.

P = The heater's power

Considering the query.

Assumed:

m = 2 kg

C = 335000 J/kg

P = 50 W

Substitute these values into equation

t = (2×335000)/50

t = 13400 seconds.

Consequently, it takes the ice 13400 seconds to melt.

The definition of specific latent heat of fusion?

The quantity of heat necessary to shift the unit mass of the substance from the solid to the liquid state without changing temperature is defined as the specific latent heat of fusion of a substance.

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1. A 0.1 mm diameter glass tube is inserted into a ethyl alcohol at 20 degree centigrade in a cup. How much does the Glycerin rise in the tube. The angle of alcohol with tube is 0 degree. D=0.1 mm=0.001 m 0∘ alcohol angel 20∘ ethyl alcohol η=1.1×10^−3 N⋅sec/ m^2sg=.0.79

Answers

A 0.1mm diameter glass tube is inserted into an ethyl alcohol at 20 degrees centigrade in a cup. The angle of alcohol with the tube is 0 degrees. D = 0.1 mm = 0.001m, alcohol angle is 0 degrees, ethyl alcohol

\(η=1.1×10^-3 N⋅sec/ m², s_g\)

=0.79.

We have to determine how much glycerin rises in the tube. The force that moves the liquid through the tube is the difference between the downward force of gravity on the liquid column and the upward capillary force produced by the surface tension of the liquid against the walls of the tube.

The height to which the fluid rises in a capillary tube may be measured by balancing the capillary force against the force of gravity on the column.

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Suppose that a Ferrari and a Porsche begin a race with a moving start, and each moves with constant speed. One lap of the track is 2 km. The Ferrari laps the Porsche after the Porsche has completed 9 laps. If the speed of the Ferrari had been 10 km/h less, the Porsche would have traveled 18 laps before being overtaken. What were the speeds of the two cars?
Help is for today

Answers

Answer:

The speed of the Porsche =  180 km/h

The speed of the Ferrari =  200 km/h

Explanation:

The distance of one lap = 2 km

The distance the Ferrari laps the Porsche = 9 laps

The distance the Ferrari will lap the Porsche with 10 km/h less speed = 18 laps

Let the speed of the Ferrari = S\(_F\), the speed of the Porsche = S\(_P\), and the time that lapse before two cars lapped = t

we have;

S\(_F\) × t₁ - S\(_P\) × t = 2 km

S\(_P\) × t₁ = 9 laps × 2 km/lap = 18 km

S\(_P\) × t₁ = 18 km

S\(_F\) × t₁ =  2 km + S\(_P\) × t = 2 km + 18 km = 20 km

S\(_F\) × t₁ =  20 km

Similarly, we are given that the following relation;

(S\(_F\) - 10) × t₂ - S\(_P\) × t₂ = 2 km...(2)

From which we have;

S\(_P\) × t₂ = 18 laps × 2 km/lap = 36 km

S\(_P\) × t₂ = 36 km

(S\(_F\) - 10) × t₂ = 2 km + 36 km = 38 km

(S\(_F\) - 10) × t₂ = 38 km

Therefore, given that S\(_P\) × t₂ (36 km) = 2 × S\(_P\) × t₁ (18 km), we have;

S\(_P\) × t₂ = 2 × S\(_P\) × t₁

t₂ = 2×t₁

Equation (2) becomes;

(S\(_F\) - 10) × 2×t₁ - S\(_P\) × 2×t₁ = 2 km...(2)

From which we have;

(S\(_F\) - 10) × 2×t₁  = 38 km

(S\(_F\) - 10) × 2×t₁  = 38 km

2 × t₁ × S\(_F\) - 2 × t₁ × 10 = 38 km

∵ S\(_F\) × t₁ =  20 km, we have;

2 × 20 km - 2 × t₁ × 10 = 38 km

2 × t₁ × 10 = 2 × 20 km - 38 km = 2 km

20 × t₁ = 2 km

t₁ = 2/20 = 0.1 hour = 6 minutes

Therefore, we have;

S\(_P\) × t₁ = 18 km

S\(_P\) × 0.1 h = 18 km

S\(_P\)  = 18 km/0.1 h = 180 km/h

The speed of the Porsche = S\(_P\) = 180 km/h

S\(_F\) × t₁ =  20 km

S\(_F\) × 0.1 h =  20 km

S\(_F\)  =  20 km/0.1 h = 200 km/h

The speed of the Ferrari = S\(_F\) = 200 km/h

The carbon monoxide molecule, CO, absorbs a photon with a frequency of 1.15 × 101 1 Hz, making a purely rotational transition from an 1-0 to an l = l energy level. What is the internuclear distance for this molecule?

Answers

The internuclear distance for this CO molecule is approximately 1.128 × 10⁻¹⁰ m. By the carbon monoxide molecule, CO, absorbs a photon with a frequency of 1.15 × 101 1 Hz, making a purely rotational.

To answer this question, we need to use the equation for rotational energy levels in a diatomic molecule, which is given by E = h²/8π²I ×J(J+1). Here, E is the energy of the rotational level, h is Planck's constant, I is the moment of inertia of the molecule, J is the quantum number for rotational energy levels, and l is the reduced mass of the molecule.
We know that the photon absorbed by the CO molecule has a frequency of 1.15 × 10¹¹ Hz, which corresponds to an energy of E = hf = 7.63 × 10⁻²⁰ J. We also know that the transition is from a J=0 level to a J=1 level, which means that ΔJ = 1.
Using the equation above, we can set up the following expression for the energy difference between the two levels:
ΔE = E(J=1) - E(J=0) = h²/8π²I ₓ (1+1)(1-0) - h²/8π²I ₓ (0+1)(0-1) = h²/8π²I
We can now substitute the value for ΔE and the given frequency of the absorbed photon into this equation, giving:
h²/8π²I = 7.63 × 10⁻²⁰ J
Rearranging for the moment of inertia, we get:
Finally, we can use the expression for the moment of inertia of a diatomic molecule in terms of its reduced mass and internuclear distance, which is I = μr², to solve for the internuclear distance:
r = √(I/μ) = √(I/mCₓmO) = 1.128 × 10⁻¹⁰ m

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When compared to winds at the surface, winds at 2,000 feet areA. higher due to absence of frictionB. higher and go at right angles to the isobars due to frictionC. higher because they move from an area of higher pressure to lower pressure

Answers

When compared to winds at the surface, winds at 2,000 feet are typically higher due to the absence of friction.

At the surface, winds are affected by friction with the Earth's surface, which slows them down and causes them to move in a more turbulent and erratic fashion. However, as winds move up in altitude, they encounter less and less friction, allowing them to increase in speed and flow in a more uniform and predictable manner.
While friction may still have some influence on winds at 2,000 feet, it is not as significant as at the surface. Therefore, winds at this altitude tend to move more smoothly and follow a more consistent path, often perpendicular to the isobars (lines of equal pressure) on a weather map. This makes them useful for aviation purposes, as pilots can use this information to plan their flight paths and take advantage of favorable tailwinds or avoid dangerous crosswinds.
In contrast, winds at the surface are more affected by local topography, temperature gradients, and other factors that can cause them to vary widely in direction and speed. Overall, winds at 2,000 feet are an important component of the Earth's atmospheric circulation system, and understanding their behavior is essential for predicting weather patterns and ensuring safe air travel.

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what is the pebble's acceleration? express your answer with the appropriate units. activate to select the appropriates template from the following choices. operate up and down arrow for selection and press enter to choose the input value typeactivate to select the appropriates symbol from the following choices. operate up and down arrow for selection and press enter to choose the input value type 51.57 m s2 submitprevious answersrequest answer incorrect; try again; 3 attempts remaining

Answers

The term  acceleration refers to a motion wherein an object travels in a straight line with an increase in velocity at equal intervals of time.

How to calculate acceleration ?

Diameter = 0.66m

r= 0.33m

Pebble speed = 2[3.14]/T *r

=6.217 m/sec

acceleration = w*w*r

=117.13m/sec

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a temperature of 54ºf measures a temperature of about:

Answers

A temperature of 54°F measures a temperature of about 12.222°C.

Degrees Celsius (°C) are used to express temperature in the metric system. Given that it is divided into 100 degrees, the Celsius scale is often known as the centigrade scale. The boiling point of water was at zero degrees Celsius, and the freezing point was at one hundred. Later, this scale was flipped, giving rise to the term "degree Celsius" and the sign °C. The temperature measurement scale and unit known as Fahrenheit is named after the German physicist Daniel Gabriel Fahrenheit, who developed it in 1724. The temperature units that are most frequently used around the world are Celsius and Fahrenheit. While Celsius is frequently used in regions like Europe, Asia, and Africa, Fahrenheit is more frequently used in the United States (USA).

Formula to convert Fahrenheit to Celsius:

ºC = (ºF - 32) / 1.8

°C = (54-32) / 1.8

°C = 22 / 1.8

°C = 12.222 (Ans)

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A particle (charge = 40 μC) moves directly toward a second particle (charge = 80 μC) which is held in a fixed position. At an instant when the distance between the two particles is 2.0 m, the kinetic energy of the moving particle is 16 J. Determine the distance separating the two particles when the moving particle is momentarily stopped.

Answers

Answer:

The distance separating the two particles when the moving particle is momentarily stopped is 0.947 m

Explanation:

Given that,

First charge = 40 μC

Second charge = 80 μC

Distance between the two particles = 2.0 m

Kinetic energy = 16 J

We need to calculate the distance separating the two particles when the moving particle is momentarily stopped

Using conservation of energy

\(K.E+\dfrac{kq_{1}q_{2}}{d}=\dfrac{kq_{1}q_{2}}{x}+K.E\)

Put the value into the formula

\(16+\dfrac{9\times10^{9}\times40\times10^{-6}\times80\times10^{-6}}{2}=\dfrac{9\times10^{9}\times40\times10^{-6}\times80\times10^{-6}}{x}+0\)

\(16+14.4=\dfrac{28.8}{x}\)

\(30.4x=28.8\)

\(x=\dfrac{28.8}{30.4}\)

\(x=0.947\ m\)

Hence, The distance separating the two particles when the moving particle is momentarily stopped is 0.947 m

The distance separating the two particles when the moving particle is momentarily stopped is 0.947 m.

The given parameters;

charge of the first particle, q₁ = 40 μCcharge of the second particle, q₂ = 80 μCinitial distance between the particles, x₁ = 2 minitial kinetic energy, K.E₁ = 16 J

The kinetic energy is zero at the instant the moving particle is momentarily stopped.

The distance separating the two particles when the moving particle is momentarily stopped is calculated as follows;

\(K.E_1 \ + W_1 = K.E_2 + W_2\\\\K.E_1 + \frac{kq_1q_2}{x_1} = K.E_2 + \frac{kq_1q_2}{x_2} \\\\16 \ + \ \frac{(9\times 10^9)\times (40\times 10^{-6})\times (80\times 10^{-6})}{2} = 0 \ + \ \frac{(9\times 10^9)\times (40\times 10^{-6})\times (80\times 10^{-6})}{x_2} \\\\30.4= \frac{28.8}{x_2} \\\\x_2 = \frac{28.8}{30.4} \\\\x_2 = 0.947 \ m\)

Thus, the distance separating the two particles when the moving particle is momentarily stopped is 0.947 m.

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The sum of potential energy and kinetic energy is

Answers

Answer:

The total mechanical energy

Explanation:

M = Mass

V = Velocity

G = Gravity

H = Height

KE = 1/2mv²

PE = mgh

ME = KE + PE

ME = 1/2 mv² + mgh

it requires 320 N to hold two protons in a particular arrangement. An alpha particle carries 2 protons. How much force in Newtons would be required to maintain the arrangement, if one of the protons was replaced with an alpha particle?​

Answers

Answer: 480 N is required to maintain the arrangement .

Explanation:

Given, 320 N  force is required to hold 2 protons in a particular arrangement .

Then the force required to keep 1 proton in a particular arrangement = 320/2

= 160 N

Then if  a proton is replaced by an alpha particle , it is given that a alpha contains 2 protons , then we conclude that after replcament , the arrangement has 1 alpha and 1 proton = 3 protons

Then , the force exerted by 3 protons = 3×160 = 480 N

The force exerted by the arrangement , if one of the protons is replaced with alpha is 480 N

   

What is the thickness of the Lithosphere

Answers

Answer: about 100 km[kilometers] thick

Explanation:

Answer:

about 100 km thick

Explanation: I searched it up on google <3

A large pendulum swings in the lobby of the United Nations building in New York City. The pendulum has a 91-kg gold-plated bob and a length of 22.9 m. Assume g = 9.81 m/s2.
Part A
How much time does it take for the bob to swing from its maximum displacement to its equilibrium position?
Express your answer to three significant figures and include the appropriate units.

Answers

Answer:

t = 2.40 s

Explanation:

It just told me

If you were making an electric device and needed a piece that would easily transmit an electric charge and also not react with other materials, what material would you choose?

Answers

Answer:

This question is incomplete

Explanation:

This question is incomplete because of the absence of options. However, one material that is good candidate for conducting electricity without reacting with other materials is metallic vanadium dioxide. This is because of the inability of this electrical conductor to conduct heat (an unusual property for all other electrical conductors) and thus makes it difficult for it to react with other materials (since an increase in temperature increases possibility of a reaction).

On a sunny summer day, why does a white car with a light-colored interior stay cooler than a black car with a dark-colored interior?

Solar radiation reflects off the lighter colours, away from the car, thus keeping the car cool

Solar radiation is absorbed into the lighter colours, keeping the car cool

Solar radiation is absorbed into the darker colours, keeping the car cool

Solar radiation reflects off the darker colours, away from the car, thus keeping the car cool

Answers

Answer: Solar radiation reflects off the lighter colours, away from the car, thus keeping the car cool

Explanation: This is because lighter colors reflect a good amount of radiation while darker colors absorb it. Just like, Antarctica hasn't completely melted because it reflects a lot of the heat that is acting upon it. Or, you notice that you get hotter when you wear a black shirt opposed to a white one.

Read the passage about the health risks of single-load liquid laundry packets. These packets are filled with concentrated, toxic chemicals. A 7-month-old in Florida died from swallowing the soap. Several soap and detergent companies are conducting studies to address these safety concerns; they want to reduce toxicity and to make the packets look less like candy. The U.S. Consumer Product Safety Commission (CPSC) is also performing studies to build more safety into these products. Why would the CPSC perform studies when other soap and detergent companies have already conducted research on the same products? The CPSC is the only organization that can test the safety of soaps and detergents. Studies conducted by any company that benefits financially are considered unreliable. Studies performed by the CPSC give reliability to the results of improved safety obtained by each soap company. Tests performed by the CPSC follow established scientific methods, but those performed by soap companies do n

Answers

Answer:

Studies performed by the CPSC give reliability to the results of improved safety obtained by each soap company.

Explanation:

The CPSC perform case studies when other soap and detergent companies have already conducted research on the same products because of the studies performed by the CPSC gives reliability to the results of improved safety obtained via each soap company.

The third option is correct.

What are chemicals?

The chemicals are the artificially prepared or purified and a distinct compound or substance.

Given is the passage about the health risks of single-load liquid laundry packets. The packets are filled with concentrated, toxic chemicals. A 7-month-old child in Florida died from swallowing the soap accidently. Several soap and detergent companies are conducting studies to address these safety concerns. They want to reduce toxicity and to make the packets look less like candy. The U.S. Consumer Product Safety Commission (CPSC) is also performing case studies to build more safety into these products.

The reason for CPSC to perform case studies when other soap and detergent companies have already conducted research on the same products is the studies performed by the CPSC gives reliability to the results of improved safety obtained via each soap company.

Thus, the third option is correct.

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4. Which statement best describes a neap tide?

a. a rise in ocean water levels that takes place on the side of Earth nearest the Moon

b. the difference in levels of ocean water at high tide and at low tide

c. a tide of minimum range that takes place two times a month

d. the periodic rise and fall of the water level in the oceans

Answers

Answer: c. A tide of minimum range that takes place two times a month best describes a neap tide.

A neap tide occurs when the gravitational pull of the sun and the moon are at right angles to each other, resulting in the smallest difference between high and low tides. This occurs twice a month, during the first and third quarters of the lunar cycle. During neap tides, the high tides are lower and the low tides are higher than average.

Explanation:

A 2 kg marble moving at 4 mi./s collides into a 1 kg marble at rest. After collision, the 2 kg marble speed decreased to 2 mi./s. Calculate the velocity and speed of the 1 kg marble immediately after colliding.

Please show work and please help me as fast as possible because this is time

Please help as soon as possible please

Please I’m begging

Answers

Answer:

\(2\sqrt{6}\)  \(\frac{mi}{s}\)

Explanation:

Assuming there is no waste of energy:

\(K_{1} = K_{2}\\\frac{1}{2}m_{1}v_{1_{1}}^{2} + \frac{1}{2}m_{2}v_{2_{1}}^2 = \frac{1}{2}m_{1}v_{1_{2}}^{2} + \frac{1}{2}m_{2}v_{2_{2}}^2\\\\=> m_{1}v_{1_{1}}^{2} + m_{2}v_{2_{1}}^2 = m_{1}v_{1_{2}}^{2} + m_{2}v_{2_{2}}^2\\\\m_{1} = 2 kg, m_{2} = 1 kg, v_{1_{1}} = 4 \frac{mi}{s} , v_{2_{1}} = 0\\=> 32 = 8 + v_{2_{2}}^{2} => v_{2_{2}} = 2\sqrt{6} \frac{mi}{s}\)

A car drives 10km with a speed of 72 km/hr and then runs out of gas. Then you walk 2km for the next 30 min
until you find a gas station.

Answers

Given :

A car drives 10 km with a speed of 72 km/hr and then runs out of gas.

Then you walk 2 km for the next 30 min  until you find a gas station .

To Find :

The average speed of whole journey .

Solution :

Average speed is given by :

\(v_{avg}=\dfrac{\text{Total distance covered}}{\text{Total time taken}}\\\\v_{avg}=\dfrac{10+2}{\dfrac{10}{72}+\dfrac{1}{2}}\\\\\\v_{avg}=18.78\ km/hr\)

Hence , this is the required solution .

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