You are helping a friend moving to the 25th floor of an apartment building. You and your friend are loading on the elevator one of her large moving boxes, having a mass of 25.0 kg. As the elevator is accelerating upward with an acceleration of 3.80 m/s2, you push horizontally on the box. What is the magnitude of the force you should apply so that the box will start to move? Once it began to move, what force magnitude would you need to make it slide at constant speed? The coefficients of friction between the box and the elevator floor are μs = 0.64 and μk = 0.32.

11. you want to calculate the displacement of an object thrown over a bridge. using -10 m/s2 for acceleration due to gravity, what would be the total displacement of the object if it took 8 seconds before hitting the water?

Astronomers discover an exoplanet (a planet of a star other than the sun) that has an orbital period of 3.87 earth years in its circular orbit around its sun, which is a star with a measured mass of 3.59 x 1030 kg. find the radius of the exoplanet's orbit.

Water at room temperature of 20.0°c is poured into an aluminum cylinder which has graduation markings etched on the inside. the reading in the graduations is 300.0 cc. the cylinder with the water in it is then immersed in a constant temperature bath at a temperature of 100°c. what is the reading for the level of water on the graduations of the cylinder after the water and the cylinder reach thermal equilibrium with the bath? the volume coefficient of expansion of water is 2.07 x 10^-4 k-1, and the linear coefficient of expansion of aluminum is 23.0 x 10^-6 k-1. a) 305.0 cc b) 304.0 cc c) 303.5 cc d) 303.3 cc e) 304.5 cc