What happens to the temperature of a substance while it is changing state?
A. It increases first and then decreases.
B. It decreases first and then remains constant.
C. It varies randomly.
D. It remains constant.

Answer:

The rate of change of velocity is acceleration.

Explanation:

In order to determine the number of particles of methane, use the following expression:

number of particles = (mass /molar mass ) x Avogadro's number

in this case, you have:

molar mass = 16.03 grams/mole

mass = 120 grams

Avogadro's number = 6.02*10²³ particles/mol

replace the previos values of the parameters into the formula for the number of particles:

number of particles=(120 grams/ 16.03 grams/ mol)x(6.02*10²³particles/mol)

= (7.46 mol) x (6.02*10²³ particles/mol)

= 4.50*10²⁴ particles

Hence, the number of particles of methane, in 120 grams, is 4.50*10²⁴

The data set that is most likely from the car equipped with ABS is :

Although the plots related to your question is missing attached below is the missing data.  

The First plot ( acceleration vs time ) plot is the data that represents the application of brakes in a car fitted with ABS ( antilock braking system ) because of the absence of skidding effect between 6.5 and 9 seconds in the graph.

The skidding effect is present in the second plot around the same time because the car is not fitted with ABS  

Hence we can conclude that the graph that shows the car fitted with ABS is the first plot .

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Answer:

b. The branch with more resistance will have less current than the other branches

Explanation:

The resistance of a resistor, is the property of a conductive material that prevents or oppose the flow of current through it

The resistivity is the resistance per unit length per unit cross sectional area

Based on the nature of electric current flow and resistance; the electric current flows through the path of least resistance

Therefore, more of the electric current will flow through the branch with lowest amount of resistance while a lesser amount of current will flow through the branch with more resistance.

Answer:

0.39 seconds

Explanation:

Given:

Distance, S = 0.75 m

Acceleration due to gravity, g = 9.81 m/s^2

Initial (vertical) velocity, u = 0 m/s

Final velocity,

S = ut + (1/2)gt^2

0.75 = 0(t) + (1/2)(9.81)t^2

t^2 = 0.75/(9.81/2) = 0.1529 s^2

t = sqrt(0.1529) s.

= 0.391 s.

The time it takes an object to fall a certain distance is 0.39 s. Therefore, option (B) is correct.

To determine how long it takes for the glass of iced tea to hit the ground, we can use the kinematic equation that relates the distance, time, initial velocity, and acceleration of an object under free fall.

Assuming the glass is dropped from rest, its initial velocity is zero, and the acceleration due to gravity is\(-9.8 m/s^2\) (negative because it is acting in the opposite direction to the motion).

Using the equation:

\(d = 1/2 * a * t^2\)

where d is the distance, a is the acceleration due to gravity, and t is the time, we can solve for t:

\(0.75 m = 1/2 * (-9.8 m/s^2) * t^2\)

Simplifying this equation gives:

\(t^2 = 0.75 m / (1/2 * 9.8 m/s^2) = 0.153\)

Taking the square root of both sides gives:

\(t = sqrt(0.153) = 0.39 s\)

Therefore, the correct option is B. It takes approximately 0.39 seconds for the glass of iced tea to hit the ground.

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The correct answer is velocity.

The vector measure of level and direction of motion is known as velocity. The speed at which an object goes in one direction is known as its velocity. Speed may be used to calculate both the speed of the car traveling north on the major highway and the speed of the rocket bursting in space. As you may expect, the vector velocity's scalar size (total value) corresponds to the movement's speed. Speed is the initial exit of a place in terms of time when it comes to computations. A straightforward formula that incorporates measurement, distance, and time can be used to determine speed.

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Answer:

450 kgm/s upward

Explanation:

From the question,

Change in monentum = mass× change in velocity

ΔM = mΔv....................... Equation 1

ΔM = m(v-u).................. Equation 2

Where ΔM = Change in momentum, m = mass of the gymnast, v = final velocity, u = initial velocity

Given: m = 50 kg, v = -4 m/s. u = 5 m/s

Substitute these values into equation 2

ΔM = 50(-4-5)

ΔM = 50(-9)

ΔM = -450 kgm/s

Hence the change in momentum of the gymnast is 450 kgm/s upward

Answer:

50.2 meters

Explanation:

When an object falls, it goes a distance d in time t according to the formula:

\(d=\frac{1}{2}*g*t^{2}\)

d is the distance in meter, g is the acceleration due to gravity with the value of 9.8\(m/s^{2}\) , t is the time in seconds

Therefore, \(d = \frac{1}{2}*9.8*(3.2)^{2}\)

d= 50.176 ≈ 50.2m

coal or natural gas i think

Answer:

A- The image of the moon on the waters surface is distorted.

Explanation:

Explanation:

A resistor is 'Ohmic' if as voltage across the resistor is increased, a graph of voltage versus current shows a straight line.

Answer:

A

Explanation:

accel =  Δv /  Δ t  =  12/6 = 2 m/s^2

we will use one of the kinematic equations :

d = u*t+0.5*a*t²

in which : d : distance

u : initial velocity

a : acceleration

t : time

after substitution :

initial velocity = 0 m/s (from rest)

2.8 = 0*t+0.5*7.14*t²

2.8 = 3.57*t²

t² = 0.7843

after square root

t = 0.885615 s

I hope this answer will help

The volume of the copper will increase by 10.08 cm³ when it is heated and its temperature is increased by 100°C.

When the copper measuring 20x30x10 cm is heated and its temperature is increased by 100°C, the volume of the copper will increase. This increase in volume is due to the fact that the heat causes the atoms in the copper to vibrate more rapidly, which increases the space between them and therefore increases the volume of the copper.To calculate the amount by which the volume of copper will increase, we can use the formula for thermal expansion. The formula is given by:
ΔV = V₀αΔT
Where ΔV is the change in volume, V₀ is the initial volume of the copper, α is the coefficient of thermal expansion for copper, and ΔT is the change in temperature.
The coefficient of thermal expansion for copper is 16.8 × 10⁻⁶ /°C. Using the given dimensions of the copper (20x30x10 cm), we can calculate the initial volume of the copper:
V₀ = 20 cm × 30 cm × 10 cm = 6000 cm³
Substituting the values into the formula, we get:
ΔV = (6000 cm³) × (16.8 × 10⁻⁶ /°C) × (100°C) = 10.08 cm³

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A message to travel from earth to a spacecraft at mars as its closest to earth is about 3.11 minutes.

To find the time, the given values are,

Distance = 56 million kilometers.

Here,

A message needs to be traveled to mars from earth and the distance between Earth and Mars (given) s = 56 million km

Speed of light = 3.00—10^5 km/ sec

As We know Velocity,

Velocity = distance / time

=> time = distance / velocity

Time taken t = 56 million km / 3.00—10^5

= 56 x 10^6 / 3 x 10^5

= 186.666 sec

Time taken t = 3.11 min.

So, the message to travel from earth to a spacecraft at mars as its closest to earth is about 3.11 minutes.

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Answer: 210 J

Explanation:

Since there is no friction, coefficient of friction, μ = 0

The free body diagram is shown below

There must be a downward force due to gravity. Thus,

Net force = applied force - downward force

From the diagram,

Downward force = mgSinθ

where

m is the mass of the crate

θ is the angle between the plane and the horizontal axis

g is the acceleration due to gravity

From the information given,

m = 3

applied force = 50N

θ = 30

g = 10 m/s^2

Net force = (50 - 3 x 9.81Sin30) = 35 N

Net work = net force x distance

Given that distance = 6m,

Net work = 35 x 6

Net work = 210 J

Directly proportional is: energy and frequency; Inversely proportional: wavelength and energy and frequency and wavelength.

(a) The wavelength and energy are inversely proportional to each other. This implies that as the wavelength of a wave increases, its energy decreases, and as the wavelength decreases,  energy increases.

(b) The frequency and wavelength are inversely proportional to each other. This implies that as  frequency of a wave increases, its wavelength decreases, and as frequency decreases, wavelength increases.

(c) Energy and frequency are directly proportional to each other. This implies that as frequency of a wave increases, its energy also increases, and as frequency decreases, energy decreases.

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Exposing the photographic plate or CCD to light for longer periods of time means that more light energy is being absorbed by the sensor, which results in a brighter and more detailed image. However, prolonged exposure may also lead to overexposure and loss of detail in the brightest areas of the image.A photographic plate is a light-sensitive material used for capturing photographic images. It is typically made of a thin sheet of glass or plastic coated with a layer of light-sensitive silver halide crystals suspended in a gelatin emulsion. When exposed to light, the silver halide crystals undergo a chemical reaction that forms a latent image. This latent image can be developed into a visible image through a series of chemical processes that reduce the exposed silver halide crystals to metallic silver.

Photographic plates were the primary medium for capturing photographic images before the advent of digital cameras. They were widely used in scientific research, astronomy, and artistic photography throughout the 20th century. One of the advantages of photographic plates is their high resolution, which can be several orders of magnitude higher than that of digital cameras. This makes them useful for capturing fine details in scientific and astronomical images.However, photographic plates have largely been replaced by digital cameras due to their limitations. They are relatively slow to process, require careful handling, and produce physical negatives that must be stored and preserved. Digital cameras offer greater convenience, speed, and versatility, and have become the standard for most modern photography. Nonetheless, photographic plates continue to be used in specialized fields, such as astrophotography, where their unique properties are still valued.

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C-peptide is secreted in equal amounts to insulin and can serve as a reliable clinical indicator of endogenous insulin production. Measuring C-peptide levels in the bloodstream is valuable for assessing pancreatic beta cell function, differentiating endogenous insulin from exogenous insulin, and evaluating conditions related to insulin secretion and metabolism.

C-peptide is a peptide hormone that is produced in equal amounts to insulin by the beta cells of the pancreas. During the production of insulin, a precursor molecule known as proinsulin is synthesized. Proinsulin consists of three parts: insulin, C-peptide, and a connecting peptide called the C-peptide.

When proinsulin is processed, it is split into insulin and C-peptide, and both are released into the bloodstream. While insulin plays a crucial role in regulating blood sugar levels, C-peptide has no known physiological function. However, C-peptide has unique characteristics that make it useful as a clinical indicator of endogenous insulin production.

Since C-peptide is secreted in equal amounts to insulin, measuring C-peptide levels in the bloodstream can provide an indirect assessment of insulin secretion. This is particularly valuable in cases where direct measurement of insulin levels may be challenging or inaccurate due to various factors such as insulin degradation, antibodies interfering with insulin assays, or exogenous insulin administration.

In clinical settings, C-peptide levels are often used to evaluate pancreatic beta cell function and assess insulin production. Low C-peptide levels may indicate impaired insulin secretion, such as in cases of type 1 diabetes where there is an autoimmune destruction of beta cells. On the other hand, elevated C-peptide levels may be observed in conditions like insulinoma, a tumor of the beta cells that causes excessive insulin secretion.

Furthermore, C-peptide testing can be used to distinguish between endogenous insulin production and exogenous insulin administration in individuals with diabetes. Since exogenous insulin lacks C-peptide, measuring C-peptide levels can help determine if the detected insulin is of endogenous origin or from external insulin injections.

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Thus, the car travels 500 m after starting. Hence, the correct option is (c) 500 m.

Given that a car starting from rest accelerates at a constant 2.0 m/s² for 10 s, it then travels with constant speed it has achieved for another 10 s and finally slows to a stop with constant acceleration of magnitude 2.0 m/s². We need to determine how far it travels after starting.

To determine the distance traveled, we have to calculate the total distance traveled in each of the three phases and then add them together. Let's calculate each phase separately:

Phase 1: From rest, the car is accelerating at 2.0 m/s² for 10 seconds. We know that, Acceleration, a = 2.0 m/s²Time taken, t = 10 s Initial velocity, u = 0 m/s Distance, S = ?The formula for the distance covered during acceleration is given by, S = ut + 1/2at²S = 0 + 1/2 × 2.0 m/s² × (10 s)²S = 100 m So, the distance covered in Phase 1 is 100 m.

Phase 2: The car travels at constant speed for 10 seconds. The car continues to move with a constant speed for 10 seconds. Distance covered during the constant speed phase = Speed × Time As there is no acceleration during this phase, speed = acceleration × time + initial velocity = 2.0 m/s² × 10 s + 0 = 20 m/s Therefore, the distance covered in Phase 2 is 20 m/s × 10 s = 200 m.

Phase 3: Finally, the car comes to a stop with a deceleration of 2.0 m/s² for some time, say t seconds.

Distance covered during the deceleration phase, Acceleration, a = −2.0 m/s², Time taken, t = ?Initial velocity, u = 20 m/s Distance, S = ?

The formula for the distance covered during deceleration is given by:

S = ut + 1/2at²S = 20 m/s × t + 1/2 × (−2.0 m/s²) × t²S = 20t − t² m

Now, using the third equation of motion, we have,

v² = u² + 2

as where v = 0 m/s (final velocity), u = 20 m/s (initial velocity), ma = −2.0 m/s² (deceleration)

S = ?

Substituting the values in the above equation, we get:

0 = (20 m/s)² + 2 × (−2.0 m/s²) × S

Solving for S,S = 200 m

Therefore, the distance covered in Phase 3 is 200 m.

Finally, the total distance covered by the car can be obtained by adding the distances covered in the three phases.

Distance covered = 100 m + 200 m + 200 m = 500 m.

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Answer:

graph 1

Explanation:

When it comes to a graph showing "constant acceleration," the line should be straight and upward (positive acceleration) or straight and downward (negative acceleration). The variables for acceleration are time and velocity. The independent variable (time) should be placed on the x-axis while the dependent variable (velocity) should be placed on the y-axis. As time increases, the velocity increases the same way. It doesn't slow down or changes. This makes it constant. They are also directly proportional to each other. This is evident on the first graph.

Answer:

40 ms¯².

Explanation:

To solve this problem, we shall illustrate the question with a diagram.

The attached photo gives a better understanding of the question.

From the attached photo:

Velocity (v) = 160 ms¯¹

Time (t) = 4 secs.

Acceleration (a) =?

Acceleration (a) = Velocity (v) /time (t)

a = v/t

a = 160/4

a = 40 ms¯²

Therefore, the initial acceleration of the rocket is 40 ms¯².

Answer:

True

Explanation:

Dietary fiber contains an indigestible material known as cellulite. This is false statement.

Plant substances that are not broken down by human digestive enzymes are referred to as dietary fiber.

Only lignin and a few polysaccharides were recognized as meeting this criterion in the late 20th century, but resistant starch and oligosaccharides were listed as dietary fiber components in the early 21st century.

The phrase "all polysaccharides and lignin, which are not digested by the endogenous secretion of the human digestive tract" is commonly used to define dietary fiber.

At the moment, the majority of animal nutritionists either use a physiological definition, which states that "dietary components resistant to breakdown by mammalian enzymes," or a chemical definition, which states that "the sum of non-starch polysaccharides (NSP) and lignin."

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Answer:

\(a=3.90\ m/s^2\)

Explanation:

Given that,

Initial velocity, u = 50 m/s

Final velocity, v = 75 m/s

DIstance, d = 400 m

We need to find the acceleration of the car. Let the acceleration of the car be a. We can use the third equation of motion to find it as follows :

\(v^2-u^2=2ad\\\\a=\dfrac{v^2-u^2}{2d}\\\\a=\dfrac{(75)^2-(50)^2}{2(400)}\\\\=\dfrac{3125}{2(400)}\\\\=3.90\ m/s^2\)

So, the acceleration of the car is \(3.90\ m/s^2\).

All of these methods can be useful in identifying a faulty component in a circuit, and which one to use depends on the specific situation and the experience of the troubleshooter.

When a circuit component fails, it can cause the entire circuit to malfunction. Troubleshooting a circuit requires identifying the problematic component so that it can be replaced or repaired. There are different methods to determine which component is not working properly, including voltage testing, ohm amp draw, and hopscotching.

Voltage testing involves measuring the voltage at various points in the circuit to identify where the voltage drop occurs, which can indicate a faulty component.

Ohm amp draw involves measuring the resistance and current flow through each component to determine if any are outside of their expected range.

Hopscotching involves checking each component in the circuit one by one, starting from the power source, to see which one is causing the problem.

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Answer:

Explanation:

The reaction force to the action force during a rocket launch would be the force exerted by the ground or launch pad on the rocket. The action force is the force of explosion from the burning fuel and expanding gases, which propels the rocket upward. The reaction force is the force exerted by the ground or launch pad in response to this action force, which keeps the rocket grounded and prevents it from moving. The action and reaction forces are equal in magnitude but opposite in direction, and they act on different objects. The action force acts on the rocket, while the reaction force acts on the ground or launch pad.