Answer: B
Explanation: He lifts the same thing just double the height
Answer:
The answer should be 0.825
Explanation:
I took like 20 mins to figure this out lol
b. hydrogen
c. gold
d. table salt
27%
20%
15%
Answer:
The percentage of its mechanical energy does the ball lose with each bounce is 23 %
Explanation:
Given data,
The tennis ball is released from the height, h = 4 m
After the third bounce it reaches height, h' = 183 cm
= 1.83 m
The total mechanical energy of the ball is equal to its maximum P.E
E = mgh
= 4 mg
At height h', the P.E becomes
E' = mgh'
= 1.83 mg
The percentage of change in energy the ball retains to its original energy,
ΔE % = 45 %
The ball retains only the 45% of its original energy after 3 bounces.
Therefore, the energy retains in each bounce is
∛ (0.45) = 0.77
The ball retains only the 77% of its original energy.
The energy lost to the floor is,
E = 100 - 77
= 23 %
Hence, the percentage of its mechanical energy does the ball lose with each bounce is 23 %
Answer: 23
Explanation: gradpoint
Answer:
b
Explanation:
b. the average kinetic energy of molecules
c. the average potential energy of molecules
d. the direction of the moving molecules in a substance
Temperature measures the average kinetic energy of molecules in a substance.
The correct answer is b. the average kinetic energy of molecules.
Temperature measures the average kinetic energy of molecules in a substance. When the temperature of a substance increases, the molecules move faster and have more kinetic energy. This is why substances generally expand when heated and contract when cooled.
For example, when you heat water, the temperature increases, and the water molecules move faster, eventually reaching a boiling point where they have enough kinetic energy to break the bonds and escape as steam.
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