Physics
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An open lift is descending at a steady speed of 2.5 m/s relative to the ground as shown in the figure below. A person in the lift throws a small box horizontally outward from the lift with a speed of 10.0 m/s. Determine the magnitude and direction of the initial velocity of the box relative to a person standing on the ground.
Rocks on a slippery mountain can turn into swift projectiles as they slide. Imagine a rock at the ridge of a mountain incline at a 22° angle below the horizontal, with an initial velocity of 6.0 m/s. If the mountain's edge is 13 m above the ground, calculate the horizontal distance between the base of the mountain to the point at which the rock hits the ground.
An ice chunk on a slippery glacier becomes a projectile when it slides off the ridge of a glacier inclined at a 32° angle below the horizontal. The glacier's edge is 12.0 m above the ground. The distance from the ice chunk to the glacier's edge is 7.0 m, and the coefficient of kinetic friction (μk) between the ice piece and the glacier is 0.20. If the ice chunk starts from rest, calculate the speed of the ice chunk when it hits the ground.