Q. A roller-coaster car may be represented by a block of mass 50.0 kg. The car is released from rest at a height h = 54m above the ground and slides all along a frictionless track. The car encounters a loop of radius R = 18 m at ground level. As you will learn in the course of this problem, the initial height 54.00 m is great enough so that the car never loses contact with the track.
Q. A 1.00 kg toy raft floats on water with 68 percent of its volume submerged. A lead block is placed on the raft and the raft is then fully submerged with lead block just above the surface of the water. Find out the mass of the lead block.