Asubway train is traveling north at a speed of 35 km/h while a passenger walks south through the train at a speed of 2 km/h. from the passenger's frame of reference, how fast is she traveling in relation to the train?

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?

According to newton’s law of universal gravitation, which statements are true? as we move to higher altitudes, the force of gravity on us decreases. as we move to higher altitudes, the force of gravity on us increases. as we gain mass, the force of gravity on us decreases. as we gain mass, the force of gravity on us increases. as we move faster, the force of gravity on us increases.