Mechanics | Relativity Answers

A kangaroo can jump over an object 2.50 m high. (a) Calculate its vertical speed when it leaves the ground. (b) How long is it in the air?

An object is dropped from a height of 75.0 m above ground level. (a) Determine the distance traveled during the first second. (b) Determine the final velocity at which the object hits the ground. (c) Determine the distance traveled during the last second of motion before hitting the ground.

12) A ball is thrown straight up. It passes a 2.00-m-high window 7.50 m off the ground on its path up and takes 1.30 s to go past the window. What was the ball’s initial velocity?

13) A coin is dropped from a hot-air balloon that is 300 m above the ground and rising at 10.0 m/s upward. For the coin, find (a) the maximum height reached, (b) its position and velocity 4.00 s after being released, and (c) the time before it hits the ground.

How does the acceleration of a cart depend on the net force acting on the cry if the total mass is constant?

The Velocity of a 621 kg auto is changed from 10.0 m/s to 44.0 m/s in 70.7 s by external, constant force. What is the result in chambers in momentum of the car? What is the magnitude of the force?

find the kinetic energy of a rigid body rotating about a fixed point.

The aorta is a major artery, rising upward from the left ventricle of the heart and curving down to carry blood to the abdomen and lower half of the body. The curved artery can be approximated as a semicircular arch whose diameter is 4.3 cm. If blood flows through the aortic arch at a speed of 0.36 m/s, what is the magnitude (in m/s2) of the blood's centripetal acceleration?

A 3.60 kg block is suspended from a spring with k = 560 N/m. A 56.0 g bullet is fired straight up into the block from directly below with a speed of 124 m/s and becomes embedded in the block.
(a) Find the amplitude of the resulting simple harmonic motion.
(b) What percentage of the original kinetic energy of the bullet is transfered to mechanical energy of the oscillator?

How does the force exerted upward by the pulley change as the system begins accelerating?