Mechanics | Relativity Answers

What are the necessary conditions for mechanical work?

At exactly 2 hr :00min a pendulum Bob is thrown vertically upward from the ground with an initial velocity of 75m/s,at what time will the Bob return to the ground

A plank 15, c, m,

15cm wide and 1, point, 5, m,

1.5m long is laid across a muddy path. What will be the pressure on the mud when I stand on the plank? (670 N)

A certain copper ore contains 2 % Cu₂S. The metallurgical process for recovering elemental

Cu from this ore gives 70 % of the theoretical yield. How much Cu is recovered from 2.0 tons of this one?

An electric train moves from rest with a uniform acceleration of 1.5 for the first 10s and continues accelerating at 0.5 for a further 20s. It continues at a constant speed for 90s and finally takes 30s to decelerate uniformly to rest.

Using the equations of motion calculate the total distance travelled

An electric train moves from rest with a uniform acceleration of 1.5 for the first 10s and continues accelerating at 0.5 for a further 20s. It continues at a constant speed for 90s and finally takes 30s to decelerate uniformly to rest.

Using the equations of motion calculate the total distance travelled

Calculate the kinetic energy of a 750 kg car moving at 13.9 m/s

a motorcyclist heading east through small city Acelerates after he The sign post marking the city limits. this acceleration is a Constant 4.0m/s² at time t=0 he is 5.0 m east of the signpost tmoving east at 15 m / s.

Find the position and velocity at time t = 2.0s? when is the motorcyclist when his velocity id 25 / s ?

A ball is thrown vertically upward with a speed of 10m/s.1sec later from the same position ball b is thrown vertically upward at the same path with the speed of 25m/s.what is the height of ball b when it meets ball a

A parachutist of mass 70kg falls out of an aeroplane from a height of 2000m and falls under gravity until 600m from the ground when he opens his parachute. The parachute provides a resistance of 2330N. Find the speed at which the parachutist is travelling when he reaches the ground.