How is the momentum of an object determined?
What happens every time one of the boys playing ping pong hits the ball?
How could the boy playing ping pong keep from hitting the ball off the table?
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Answer: He needs to hit the ball with less force.
Explanation:
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What is true for two pieces of iron at the same temperature that are different mass?
A) The average kinetic energy of their particles is different.
B) Heat flows from the larger object to the smaller object.
C) The total thermal energy of their particles is different.
D) Heat flows from the smaller object to the larger object.
Answer:
Their particles have the same total kinetic energy.
Explanation:
Their particles have the same total kinetic energy.
C) The total thermal energy of the particles in each piece of iron will be different, because the total energy of a substance is proportional to its mass. However, if they are at the same temperature, their average thermal energy per particle will be the same.
The table shows the same data about how the temperature of each pizza changed over 15 minutes.
Which statement is correct?
A) Thermal energy (heat) was transferred faster out of the pizza on the bottom.
B) Thermal energy (heat) was transferred faster out of the pizza on the top.
C) Thermal energy (heat) was transferred out of both pizzas at the same rate.
A
explanation
Heat is the transfer of energy from a warmer object to a cooler object. For example, a lighted match (higher temperature object) will transfer heat to a large pan filled with lukewarm water (lower temperature object).
The table shows the same data about how the temperature of each pizza changed over 15 minutes.
Which statement is correct?
A) Thermal energy (heat) was transferred faster out of the pizza on the bottom.
B) Thermal energy (heat) was transferred faster out of the pizza on the top.
C) Thermal energy (heat) was transferred out of both pizzas at the same rate.
The table shows the masses and speeds of four different carts.
Which cart has the least kinetic energy?
A. cart d
B. cart b
C. cart c
d. cart d