1) An object falls past a window on the fifth floor of a building, when it reaches...
Question:
1) An object falls past a window on the fifth floor of a building, when it reaches the bottom of the window it has a speed of 5.45m/s. If the window is 1.5m tall how long does it take for the object to pass an identical window on the fourth floor, the top of which is two meters below the fifth floor window? Neglect air resistance.
2) A canon fires a cannonball over the wall of an enemy castle which is 30m away. The wall is twenty meters high and the canon fires the cannonball at an initial speed of 30m/s at an angle of 60 degrees above the horizontal. The cannonball leaves the muzzle of the canon 1m above the ground. How high above the top of the wall is the cannonball when it passes the wall?
3) Two masses, M1 = 10 kg and M2 = 5 kg, are on a horizontal surface. M1 is directly in contact with the surface and M2 is on top of M1. M1 is being pushed by a horizontal for F. The masses are made of different materials such that the coefficient of static friction between M1 and the ground is μs=0.1, whereas the coefficient of static friction between M2 and M1 is μ = 0.5.
a) What is the maximum force, F, that can be applied before the masses slide?
b) What is the maximum force F that can be applied before there is slippage between M1 and M2.