A British Thermal Unit (BTU) is defined as the amount of energy required to raise the temperature of one pound of water by one degree Fahrenheit. Your family has a water heater that is rated for 30,000 BTUs and has a capacity of 500 pounds of water. What is the expected change in temperature of the water?
a. 140 F
b. 120 F
c. 90 F
d. 60 F
e. 30 F

Answer:

I think it's option D

Explanation:

I think it's option D but not so sure

Answer:

The root pass is made with a 5/32” (4.0mm) diameter electrode. A cellulosic electrode (E-XX10) is being used. The root pass is welded with reverse (DC+) polarity.

Explanation:

In root pass welding, that electrode we are going to use cellulosic electrode (E-XX10).

Short arc welding is commonly used for root pass welding to prevent blow through and overheating at the weld joint. Because there is less drooping and suck back, short arc welding is also commonly used on root pass joints.

The first pass in any welding process that combines two pieces or members into one structure is referred to as the root pass.

Subsequent passes raise the weld depth to the desired thickness, resulting in the required strength. The first pass usually serves as the foundation for subsequent filler passes.

A 5/32" (4.0mm) diameter electrode is used for the root pass. A cellulosic electrode (E-XX10) is being used. The root pass is welded with reverse (DC+) polarity.

Thus, cellulosic electrode (E-XX10) for this.

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the case requires rotational equilibrium, for which the torque about O has to be 0.

The length of the rod is unclear, so i'll answer it according to the divisions in rod.

force at A = 0.8g

force at b = xg

0.8g*2 = xg*4

x = 0.4 = 400g

The closest mass to a 100N seed bag is 10.2 kg. How much anything weighs determines how much gravity is dragging it down. It results from the mass of an item and the acceleration brought on by gravity.

The formula, which yields an object's weight,

W = mg

the sack's weight is provided by,

W = 100 N

Adding all the numbers to the equation, where the value of g is 9.8 m/s2 (gravitational acceleration).

100 = m×9.8

m = 100/9.8 = 10.2 kg.

Consequently, the sack weighs 10.2 Kg.

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1 meter per second squared is equivalent to 0.001 kilometer per second squared.

To convert 1 meter per second squared (m/s²) into kilometer per second squared (km/s²), we need to consider the conversion factor between meters and kilometers.

1 kilometer is equal to 1000 meters, so we can use this conversion factor to convert the units.

First, let's convert the acceleration from meters per second squared to kilometers per second squared:

1 m/s² = (1/1000) km/s²

Therefore, 1 meter per second squared is equal to 0.001 kilometer per second squared.

So, 1 m/s² = 0.001 km/s².

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Answer:

Acceleration of one cyclist=\(2.67m/s^2\)

Yes, the acceleration is higher of another cyclist who accelerates from 0 to 30 m/s in 8 seconds.

Explanation:

We are given that

Initial velocity of one cyclist, u=0 m/s

Final velocity of one cyclist, v=8m/s

Time, t=3 s

Initial velocity of another cyclist, u'=0

Final velocity of another cyclist, v'=30m/s

Time, t'=8 s

We know that

Acceleration, \(a=\frac{v-u}{t}\)

Using the formula

\(a=\frac{8-0}{3}=\frac{8}{3}=2.67m/s^2\)

Acceleration of one cyclist=\(2.67m/s^2\)

Acceleration of another cyclist, a'=\(\frac{30-0}{8}m/s^2\)

Acceleration of another cyclist, a'=\(3.75m/s^2\)

Yes, the acceleration of another cyclist is higher than the cyclist which accelerates from 0m/s to 8m/s.

(a)The critical value for a 95% confidence level is approximately 1.96. (b) A higher confidence level requires a wider interval to capture the true population mean with greater certainty.

(a) To construct a 95% two-sided confidence interval on the mean life of the light bulbs, we can use the formula:

CI = X ± z × (σ ÷√n)

where X is the sample mean, σ is the population standard deviation, n is the sample size, and z is the critical value corresponding to the desired confidence level.

In this case, X= 1014 hours, σ = 25 hours, and n = 20. The critical value for a 95% confidence level can be found using a standard normal distribution table or a calculator. For a two-sided confidence interval, we divide the desired confidence level by 2 and find the corresponding z-value.

The critical value for a 95% confidence level is approximately 1.96. Substituting the values into the formula, we have:

CI = 1014 ± 1.96 × (25 ÷ √20)

the confidence interval on the mean life.

(b) To construct a 95% lower-confidence bound on the mean life, we can use the formula:

Lower bound = X - z × (σ ÷ √n)

Using the same values as in part (a), the lower bound can be calculated.

The lower bound from part (a) is the lower confidence bound for the mean life.

For the second part of the question, we have two confidence intervals: (38.02, 61.98) and (39.95, 60.05).

(a) To find the value of the sample mean, we take the average of the lower and upper bounds of each confidence interval. The sample mean is the midpoint of the confidence interval.

Sample mean = (38.02 + 61.98) ÷ 2 = 50

(b) One of the intervals is a 95% confidence interval, and the other is a 90% confidence interval. The interval (38.02, 61.98) is the 95% confidence interval because it is wider. A higher confidence level requires a wider interval to capture the true population mean with greater certainty.

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The additional force needed to bring the car into equilibrium is equal to the mass of the car times the acceleration of the car, or F = ma.

Equilibrium is a state of balance and stability between opposing forces or actions. In economics, it refers to the point where the supply and demand for a given product or service are equal, and the market price of the product or service is stable. In physics and chemistry, equilibrium is a state in which different competing forces are balanced, so that no net change is observed. In biology, it is the ability of an organism to maintain a stable internal environment despite changes in external conditions. Ultimately, equilibrium is a state of balance, stability, and homeostasis.

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a) uniform velocity

b) zero or no acceleration

c) (see picture)

EXPLANATION:

(see picture)

Several atmospheric factors can contribute to fatal injuries caused by excessive heat. These factors include:

1. Temperature: High ambient temperatures are a key factor in heat-related fatalities. Prolonged exposure to extreme heat can lead to heatstroke and other severe heat-related illnesses.

2. Humidity: Humidity affects the body's ability to cool itself through sweating. High humidity levels impede the evaporation of sweat, making it harder for the body to dissipate heat. This can result in a higher risk of heat exhaustion and heatstroke.

3. Heat index: The heat index takes into account both temperature and humidity to determine how hot it feels to the human body. Higher heat index values indicate an increased risk of heat-related injuries and fatalities.

4. Air quality: Poor air quality, such as high levels of pollutants or airborne particles, can exacerbate the effects of heat on the body. It can contribute to respiratory distress and other health complications, especially in individuals with pre-existing respiratory conditions.

5. Urban heat island effect: Urban areas tend to retain more heat due to the abundance of concrete, asphalt, and buildings. This can lead to higher temperatures in cities compared to surrounding rural areas, increasing the risk of heat-related injuries and fatalities.

6. Heatwave duration: The length of a heatwave can impact the severity of its effects. Prolonged exposure to extreme heat without relief or adequate cooling opportunities can escalate the risk of heat-related injuries and deaths.

It is important to monitor these atmospheric factors and take necessary precautions, such as staying hydrated, seeking shade or air-conditioned environments, and avoiding strenuous activities during periods of excessive heat, to mitigate the risks associated with fatal heat injuries.

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Answer:

the answer is mass divided by volume

Answer:

Mass divided by volume

Explanation:

Edgen answer 2020-2021

5,28 ft is the distance from the base of the cliff to the point on the ground.

This question is incomplete, it should be:

Height of the cliff = 462 ft

Angle of depression = 5°

Determine the angle of the base first,

Use the hypotenuse side:

90° - 5° = 85°

Hence, the angle of depression form the top of the cliff = 5°

So, the distance from the base of the cliff to the point on the ground:

tan α = opposite / adjacent

tan 85° = h/462

h = 462 × tan 85°

= 462 x 11.43

h ≈  5,28 ft

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It will take 472.35 seconds to decrease from 4.00 m to 0.350 m, if it takes 110 seconds to go from 1.0 m to decrease to 0.150 m.

Total distance decrease, d₁ = 1 - 0.150 = 0.85 m

Total time taken to decrease that distance, T₁ = 110 sec

Time taken to decrease unit distance, t₁ = 110/0.85 = 129.4 sec

Now, decrease in distance, d₂ = (4.0 - 0.350) = 3.65 m

Total time requires to decrease that distance, T₂ = 3.65 × 129.4

T₂ = 472.35 sec.

We can also use interpolation method to calculate this:

T₂ = 110 × (4.0 - 0.35)/(1 - 0.150) = 472.35 sec.

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The time for the ball to reach the final velocity is 3 seconds.

The time for the ball to reach the final velocity is calculated by applying first kinematic equation as shown below.

v = u + gt

where;

The time for the ball to reach the final velocity is calculated as;

v = 0 + gt

v = gt

t = v / g

t = ( 29.4 m/s ) / ( 9.8 m/s² )

t = 3 seconds

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Water conducts heat away from the body 25 times faster than still air.

When it comes to heat transfer, the rate at which heat is conducted depends on the thermal conductivity of the material. Thermal conductivity refers to the ability of a material to conduct heat. In general, water has a higher thermal conductivity than still air.

The transfer of heat occurs through the process of conduction, where heat is transferred from a warmer object to a cooler one through direct contact. Water molecules are closer together and have more opportunities for molecular interaction compared to air molecules. This closer proximity and increased molecular interaction allow water to conduct heat more efficiently.

Therefore, when water comes into contact with the body, it can absorb and carry away heat more effectively than still air. This is why activities such as swimming or taking a cold shower can help cool down the body faster compared to simply being in a still air environment.

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Answer:

m = 96.53 grams

Explanation:

Given that,

The density of metallic platinum, d = 21.5 g/cm³

Volume, V = 4.49 cm³

We need to find the mass. Let it is m. We know that the density is equal to the mass per unit volume. So,

\(d=\dfrac{m}{V}\\\\m=d\times V\\\\m=21.5\times 4.49\\\\m=96.53\ g\)

So, the required mass is 96.53 grams.

The reason why water isn't used in the manometer to measure blood pressure instead of mercury is that the pressure exerted by the blood would be much greater than the pressure that can be created by the weight of water in the column.

The pressure exerted by blood is generally above atmospheric pressure. So, it can't be measured directly. Hence, a pressure gauge is used. The mercury manometer is used to measure this blood pressure due to its high density which allows a column of mercury to be formed that can exert the pressure necessary to overcome the pressure exerted by the blood.

Hence, the pressure exerted by the blood is directly proportional to the height of the mercury column. Using water, the column required to be placed in the tube would have to be about 13 times higher than for mercury to create the same pressure.

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Answer:

expands

Explanation:

Answer:

C

Explanation:

Answer:

13807.2  J/g°C

Explanation:

I just took the test and got it correct

Answer:

The Electric Force on Negative Charge is 2.968 N

Explanation:

charge on each corner, q = 2.38 micro coulomb

Side of square, a = 75.2 cm

Coulombic constant, K = 8.98755 x 10^9 Nm²/C²

sides of the square are A,B,C and D

and all sides of a square are equal so

AB = BC = CD = DA = 75.2 cm = 0.752 m

Diagonal, AC = BD = 1.414 x 0.752 = 1.06 m

Electric field at D due to charge at A

EA= Kq÷AB^2

= 8.98755×10^9 × 9.87×10^-6 ÷ 0.752^2

EA= 156863.82 N/C

Similarly Electric field at D due to charge C

EC=Kq÷CD^2

= 8.98755×10^9 ×9.87×10^-6 ÷ 0.752^2

EC= 156863.82 N/C

Electric field at D due to charge at BB

EB=Kq÷BD^2

EB=8.98755×10^9 × 9.87×10^-6 ÷ 1.06^2

EB=78949.01 N/C

Resolve the compoents

Ex = EA + EB cos 45

Ex = 156863.82 + 78949.01 x 0.707

Ex = 212689.2 N/C

Ey = EC + EB Sin 45

Ey = 156863.82 + 78949.01 x 0.707

Ey = 212689.2 N/C

The resultant electric field is

E = 1.414 x 212689.2 = 300787.95 N/C

the electric force on the negative charge is

F = q x E

F = 9.87 x 10^-6 x 300787.95

F = 2.968 N

Answer:

hi my Friend

check in this link https://youtu.be/ErFP7VmNbGk

Explanation:

Answer:

i had a different thing and i finished mine so i thought id try my best to help

Explanation:

So i had to write about something that motivated me

looking at myself in the mirror and hating how i looked. i was okay with that at first but when others around me started calling me over weight or "chubby" it go to me. and its motivated me to work out. ill fall behind and stop but then i just think about how that made me feel and i just work harder.

Thats what i had wrote

I really hope this is helpful to someone

Answer:

I’m motivated to go to college after high school for many reasons, both extrinsic and intrinsic. I’ve always enjoyed studying literature, cultural studies, and human behavior, which is why I’m looking at colleges that offer a literature program where I can major in global cultural studies and minor in psychology or sociology. This acts as an intrinsic motivator for me because I enjoy studying these subjects. Also, I want to pursue a career as a novelist, which acts as an extrinsic motivation in my decision to go to college.

Explanation:

PLATO answer

Answer:

Sir Isaac Newton contributed significantly to the field of science over his lifetime. He invented calculus (opens in new tab) and provided a clear understanding of optics. But his most significant work had to do with forces, and specifically with the development of a universal law of gravitation and his laws of motion

Explanation:

A genius with dark secrets. Isaac Newton changed the way we understand the Universe. Revered in his own lifetime, he discovered the laws of gravity and motion and invented calculus. He helped to shape our rational world view.

Answer:

B. Atoms are altered in both processes

Explanation:

Answer: B. Atoms are altered in both processes

Explanation:

Answer:

bottle opener and door knob

Explanation:

Answer:

bottle opener

door handle

a. The total energy of the system and the maximum speed of the object when the amplitude of the motion is 3.00 cm are 0.619 m/s.

b. The velocity of the object when the displacement is 2.00 cm will be 0.365 m/s.

c. The kinetic and potential energies of the system when the displacement is 2.00 cm will be 0.036 J.

a. The total energy of the system is the sum of the kinetic and potential energies. At the maximum amplitude, all the energy is in the form of kinetic energy, and at the equilibrium position, all the energy is in the form of potential energy. Therefore, the total energy of the system is given by:

E = 1/2 kA²

where k is the spring constant, and A is the amplitude of the motion. Substituting the given values, we get:

E = 1/2 (18.5 N/m) (0.03 m)² = 0.008325 J

The maximum speed of the object can be found using the conservation of energy, which states that the total energy of the system is constant. At the maximum amplitude, all the energy is in the form of kinetic energy, and at the equilibrium position, all the energy is in the form of potential energy. Therefore, we can write:

1/2 mv² = 1/2 kA²

where m is the mass of the object, v is the maximum speed of the object. Solving for v, we get:

v = √(k/m) A = √(18.5 N/m / 0.530 kg) (0.03 m) = 0.619 m/s

b. The velocity of the object when the displacement is 2.00 cm can be found using the conservation of energy. At any point in the motion, the total energy of the system is given by:

E = 1/2 kx² + 1/2 mv²

where x is the displacement of the object from the equilibrium position. At the point where x = 2.00 cm = 0.02 m, we know the potential energy of the system is:

U = 1/2 kx² = 1/2 (18.5 N/m) (0.02 m)² = 0.0037 J

Using conservation of energy, we can write:

1/2 mv² = E - U

Substituting the given values, we get:

1/2 (0.530 kg) v² = 0.008325 J - 0.0037 J

Solving for v, we get:

v = √(2(E - U)/m) = √(2(0.008325 J - 0.0037 J)/(0.530 kg)) = 0.365 m/s

c. The kinetic and potential energies of the system when the displacement is 2.00 cm can be found using the equations:

U = 1/2 kx² = 1/2 (18.5 N/m) (0.02 m)² = 0.0037 J

K = 1/2 mv² = 1/2 (0.530 kg) (0.365 m/s)² = 0.036 J

Therefore, the potential energy of the system at x = 2.00 cm is 0.0037 J, and the kinetic energy of the system at x = 2.00 cm is 0.036 J.

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Answer:

290

Explanation: