When the temperature is cold, Tim's tires look under-inflated. This is because the air molecules in the tire ____ causing their kinetic energy to _ and volume to ___..A). slow down, decrease, contract
B). multiply, increase, fluctuates.
C). stay the same, increase, expand. Eliminate.
D). speed up, decrease, stay the same.

Answers

Answer 1

Answer: The correct answer should be D). speed up, decrease, stay the same.

During cold times, air molecules speed up while the energy decreases. Since the volume stays the same, it appears as if the tires look under-inflated, while in reality they're not.

Answer 2

Answer:

When the temperature is cold, Tim's tires look under-inflated. This is because the air molecules in the tire slow down causing their kinetic energy to decrease and volume to contract. slow down, decrease, contract on USA Test Prep its A.

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Which of the following is a disadvantage of friction?Air resistance of a parachute slows down the descent of a skydiver.
Friction reduces the efficiency of engines and other machines by converting parts of their kinetic energy into heat.
Friction makes it possible for you to grasp items with your hand.
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Answers

Explanation:

The disadvantage of friction is that it reduces the efficiency of engines and other machines by converting parts of their kinetic energy into heat.

Friction between moving parts in engines and machines causes resistance, leading to energy loss through heat generation. This energy loss affects the overall efficiency of the system and can lead to increased wear and tear on the components. Engineers often design systems to minimize frictional losses through the use of lubricants, materials with low friction coefficients, or implementing other techniques to reduce friction.

The other statements mention advantages of friction:

- Air resistance of a parachute slows down the descent of a skydiver, which is beneficial for a controlled landing.

- Friction enables you to grasp items with your hand, providing the necessary grip and control.

- Friction also enables you to walk by creating the necessary traction between your feet and the ground, allowing forward motion.

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Answers

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How much kinetic energy does a 7.2-kg dog need to make a vertical jump of 1.2 m? the acceleration due to gravity is 9.8m / s^2

Answers

$E_k=mgh\n\nm=7.2\ kg\n\ng=9.8\ m/s^2\n\nh=1.2\ m\n\nE_k=7.2\cdot9.8\cdot1.2=84.672\ \left[(kgm^2)/(s^2)\right]=84.672\ [J]$

Assuming that no energy is wasted,
Use the equation Gpe=mgh
Mass*gravity*height
1.2*7.2*9.8=
84.672
(The answer might be wrong I did it in my head)

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Answers

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Answers

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Answer:

Explanation:

I took the test :)

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Answers

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