Mechanics | Relativity Answers

A flower pot is accidentally dropped from a building window 400m from the ground. Assuming it starts from rest, a How long will it take the pot to reach the ground?

A body of mass 12.0kg is placed on an orange tree 20.0m above the ground.

1. Calculate it's potential energy with respect to the ground.

2. If the body is released from thos height,what will be it's kinetic energy just before it hits the ground.

The speed limit in a school zone is 40 km/hr. A driver traveling at this speed sees a child run onto the road 13 m ahead of his car. He applies the brakes, and the car decelerates at a uniform rate of 8 m/s². If the driver’s reaction time is 0.25 s, will the car stop before hitting the car?

The speed limit in a school zone is 40 km/hr. A driver traveling at this speed sees a child run onto the road 13 m ahead of his car. He applies the brakes, and the car decelerates at a uniform rate of 8 m/s². If the driver’s reaction time is 0.25 s, will the car stop before hitting the car?

In order to get his car out of the mud, a man ties one end of a rope to the front bumper and

the other end to a tree 15 m away, as shown below. He then pulls on the center of the rope

with a force of 400 N, which causes its center to be displaced 0.30 m, as shown. What is the

force of the rope on the car?

A 90000 lbs truck is braked to a stop in 95 ft. from an initial speed of 95 ft/s . How

much force was required ?

If you have a mass of 55 kg and you are standing 3 meters away from your car, which has a mass of 1234 kg, how strong is the force of gravity between you and the car?

With its engine cut off, a small airplane glides downward at an angle of 15° below the 

horizontal at a speed of 240 km/h. (a) What are the horizontal and the vertical 

components of its velocity? (b) If the airplane is initially at a height of 2000 m above the 

ground, how long does it take to crash into the ground?  

Note: For (a), you may use m/s or km/h as long as you indicate, and you are consistent 

with the unit that you use. For (b) you may use seconds(s) or minute(m), just indicate the 

unit used.

A ball of mass 0.25kg loses one third of it's velocity on collision with an identical ball 9/2 at rest after collision q moves off with a speed of 2m/s in the original direction of p. Calculate the original velocity of p.

Show that the period of oscillation on a main helical spring is given by T=2π√{k/m}