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omeli [17]
2 years ago
7

Kirk wants to know if someone his height will go faster on a bike with a larger frame. What should he do next in order to follow

the steps of the inquiry?
A. Predict the effect of bike size on the speed of a rider his height.

B. Design an experiment in which people his height ride bikes of various sizes.

C. Observe riders his height riding bikes of various sizes.

D. Time himself riding around a track on bikes belonging to several of his friends.
Physics
2 answers:
bearhunter [10]2 years ago
8 0

Answer:

The answer is A but I could be wrong

Nesterboy [21]2 years ago
3 0

Answer: A. Predict the effect of bike size on the speed of a rider his height.

(Apex) Pretest

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Answer:

<em>The second ball has four times as much kinetic energy as the first ball.</em>

Explanation:

<u>Kinetic Energy </u>

Is the type of energy an object has due to its state of motion. It's proportional to the square of the speed.

The equation for the kinetic energy is:

\displaystyle K=\frac{1}{2}mv^2

Where:

m = mass of the object

v = speed at which the object moves

The kinetic energy is expressed in Joules (J)

Two tennis balls have the same mass m and are served at speeds v1=30 m/s and v2=60 m/s.

The kinetic energy of the first ball is:

\displaystyle K_1=\frac{1}{2}m\cdot 30^2

\displaystyle K_1=\frac{1}{2}m\cdot 900

K_1=450m

The kinetic energy of the second ball is:

\displaystyle K_2=\frac{1}{2}m\cdot 60^2

\displaystyle K_2=\frac{1}{2}m\cdot 3600

K_2=1800m

Being m the same for both balls, the second ball has more kinetic energy than the first ball.

To find out how much, we find the ratio:

\displaystyle \frac{K_2}{K_1}=\frac{1800m}{450m}

Simplifying:

\displaystyle \frac{K_2}{K_1}=4

The second ball has four times as much kinetic energy as the first ball.

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