A uniform seesaw is balanced on a fulcrum located 3.0 m from the left end, as shown. The smaller boy on the right has a mass of 40 kg and the bigger boy on the left has a mass 80 kg. What is the mass of the board?
To get up on the roof of a house, a person with a mass of 70.0 kg places a 6.00-m-long aluminum ladder against the house on a concrete pad, with the base of the ladder 2.00 m from the house. The ladder rests against a plastic rain gutter, which has negligible friction with the ladder. The ladder’s mass is 10.0 kg, and its center of mass is 2.00 m from the ladder’s bottom. The person is standing 3.00 m from the bottom of the ladder.
Find the magnitude of the normal reaction force on the base of the ladder.
Find the friction force on the base of the ladder.
A homogeneous cube of weight 100 kN sits on a horizontal plane. Determine the minimum force acting on the upper top edge of the cube, parallel with its surface, that is required to tip the block over.