Look at Figure 2. Describe the motion of the object in Graph ACompare Graphs A and B in Figure 2. At a time of 2 seconds, which graph shows a greater velocity? How do you know?

Answers

Answer 1

Answer: The graphs show distance versus time data. For graph A, we can say that velocity is constant until it reaches time of 8 seconds. And a constant velocity is again exhibited starting at time 12 seconds. For graph B, the velocity is changing as time pass by since the slope is changing. At time of 2 seconds, graph A has greater velocity since it has a steeper slope.

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Which law describes why a charged object attracts another object even though they are not in contact? A. Faraday's law B. Ohm's law C. Interaction law D. Coulomb's law

Answers

The correct answer is (d.) Coulomb's law. the Coulomb's law describes why a charged object attracts another object even though they are not in contact. The Coulomb's law is a law of physics in which describing how the electrostatic interaction happens between electrically charged particles.

A current of 2.0A flows through a light bulb. What is the amount of charge flowing through the light bulb in 40 seconds?

Answers

Answer:

Quantity of charge = 80 Coulombs

Explanation:

Given the following data;

Current = 2 A

Time = 40 seconds

To find the amount of charge flowing through the light bulb;

Mathematically, the quantity of charge passing through a conductor is given by the formula;

Quantity of charge = current * time

Substituting into the formula, we have;

Quantity of charge = 2 * 40

Quantity of charge = 80 Coulombs

A wave oscillates 50 times per second. What is its frequency?

Answers

Answer: The frequency of the wave is 0.02 Hertz.

Explanation:

Frequency is a parameters which describe a wave. This is defined as the number of oscillations happening per unit second.

Mathematically,

$Frequency=\frac{1}{\text{Number of oscillations}}$

In the question,

Number of oscillations happening per second = 50

Putting this value in above equation, we get:

$Frequency=(1)/(50)\n\n\nu=0.02Hz$

Hence, the frequency of the wave is 0.02 Hertz.

You just told us how many times per second the wave oscillates. That's a definition of frequency. So the frequency of this wave is 50 per second or 50 hertz.

Assume a hydro power plant with 85% efficiency and 30m head. It is measured that 60 kg of water passes through the turbine in 1 s. What is the output electrical power of this power plant? a) less than 1 kW
b) between 1 kW and 10 kW
c) more than 10 kW

Please show calculations!

Answers

The potential energy of each kg of water, before it falls, is

   (M G H) = (1kg) (9.8 m/s²) x (30 m) = 294 joules

The potential energy lost by 60 kg of water pouring through is

(60 x 294) = 17,640 joules

The power output of the plant is

   (17,640 joules/sec) x (85%) = 14,994 watts
   = almost but not quite 15 kW.

(If you used 10 for gravity, it would come out to 15.3 kW)

YAHOO ANSWERSA 1260 kg car moving south at 12.9 m/s collides with a 2430 kg car moving north. The cars stick together and move as a unit after the collision at a velocity of 4.38 m/s to the north. Find the velocity of the 2430 kg car before the collision.

Answers

Explanation:

Below is an attachment containing the solution.

What energy transformation takes place when you stretch a bungee cord?A.
Kinetic energy transforms into potential energy.

B.
Mechanical energy transforms into sound energy.

C.
Elastic energy transforms into kinetic energy.

D.
Potential energy transforms into elastic energy.

Answers

Answer:

D.

Potential energy transforms into elastic energy.

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