The New England Merchants Bank Building in Boston is 152 m high. On windy days it sways with a frequency of 0.16 Hz , and the acceleration of the top of the building can reach 1.8 % of the free-fall acceleration, enough to cause discomfort for occupants.

If it takes a planet 2.8 x 10^8 s to orbit a star with a mass of 6.2 x 10^30 kg what is the average distance between the planet and the star

If a simple machine reduces the strength of a force, what must be increased?

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.