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Weegy: Human muscles have an efficiency of about 18 to 26%. User: Which object would have the most momentum? A. a 500-pound car moving at 20 miles per hour B. a 200-pound car moving at 60 miles per hour C. a 100-pound car moving at 80 miles per hour D. a 50-pound car moving at 100 miles per hour Weegy: A 200-pound car moving at 60 miles per hour have the most momentum. User: Any external force that acts against movement is called __________. A. gravity B. efficiency C. resistance D. momentum (More)

Weegy: Real-world efficiencies are generally very high, in the 90 percent range. FALSE. User: One consequence of Newton's third law of motion is that __________. A. every object that has mass has inertia B. a force acting upon an object increases that objects acceleration C. all actions have equal and opposite reactions D. none of the above Weegy: One consequence of Newton's third law of motion is that all actions have equal and opposite reactions. . User: Which of the following statements about air is TRUE? A. Air is not a source of resistance. B. Air has mass, but not inertia. C. Air is not affected by human movement. D. None of these statements are true. (More)

Weegy: According to Newton's third law of motion, if you push against a wall, the wall will push against you with equal force. User: Deliberate practice is unnecessary to gain expertise. Weegy: Deliberate practice is unnecessary to gain expertise. FALSE. User: It is impossible to destroy __________. A. motion B. momentum C. energy D. velocity Weegy: It is impossible to destroy energy. User: Which of the following is NOT a factor in efficiency? A. metabolism B. type of movement C. muscle efficiency D. digestion (More)