How does a pulley make it easier to load cargo onto a cargo ship?
A. The pulley reduces the force needed to lift the load by moving it over a longer distance. It also changes the direction of the force. As the input force is applied downward, the output force is exerted upward.
B. The pulley reduces the force needed to lift the load by moving it over a shorter distance. It also changes the direction of the force. As the input force is applied upward, the output force is exerted downward.
C. The pulley increases the force needed to lift the load by moving it over a longer distance. It also changes the direction of the force. As the input force is applied downward, the output force is exerted upward.
D. The pulley increases the force needed to lift the load by moving it over a shorter distance. It also changes the direction of the force. As the input force is applied upward, the output force is exerted downward.
Which is an accurate description of the thermal energy of an entire house when compared with the thermal energy of a small bedroom in that house at the same temperature?
A.
The total kinetic energy and potential energy of the particles in a substance is its thermal energy. The entire house is larger than the small bedroom, so it contains more particles. Therefore, the entire house has the greater thermal energy.
B.
The total potential energy of the particles in a substance is its thermal energy. The entire house is larger than the small bedroom, so it contains more particles. Therefore, the entire house has the greater thermal energy.
C.
The total kinetic energy of the particles in a substance is its thermal energy. The particles in the entire house are more spread out, so it contains fewer particles than the bedroom. Therefore, it is the bedroom that has the greater thermal energy.
D.
The total potential energy of the particles in a substance is its thermal energy. The particles in the entire house are more spread out, so it contains fewer particles than the bedroom. Therefore, it is the bedroom that has the greater thermal energy.
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