Both a 50-Kg Sack Is Lifted 2 Meters from the Ground

question 61

Multiple Choice

Both a 50-kg sack is lifted 2 meters from the ground and a 25-kg sack is lifted 4 meters in the same time. The power expended in raising the 50-kg sack is

• A)twice as much as the 25-kg sack.
• B)half as much as the 25-kg sack.
• C)the same.
• D)need more information

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Definitions:

Kinetic Energy

The energy that an object possesses because of its motion, calculated by the equation 1/2 mv^2 where m is mass and v is velocity.

Temperature

A measure of the average kinetic energy of the particles in a substance, influencing its thermal state or phase.

Fire Triangle

A model explaining the three elements needed for fire: heat, fuel, and an oxidizing agent.

Combustion

Combustion is a chemical reaction in which a fuel combines with oxygen, releasing heat and light, commonly observed in fires.