A 25.0-kg box is released on a 27° incline and accelerates down the incline at 0.30 m/s2 Find the friction force impeding its motion. What is the coefficient of kinetic friction?
What will be an ideal response?
Answer:
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If the Moon crosses Earth's shadow at the center of the umbra, how long will the entire eclipse last from start to finish?
a. 2 to 3 minutes b. 7 minutes c. 1 hour 45 minutes d. 2 hours e. 6 hours
If the Moon orbited Earth backward, how would tidal interactions change?
A. The tides would arrive about an hour earlier every day. B. The length of the day on Earth would increase. C. The distance between Earth and the Moon would increase. D. The Moon would not be tidally locked with Earth.
Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the same direction. Jake's speed relative to the ground is
A) 6 m/s. B) 10 m/s. C) 14 m/s. D) none of the above
Iron is a poor choice of nuclear fuel because it releases
A) energy only when fused. B) energy only when fissioned. C) no energy when fused or fissioned.