Mechanics | Relativity Answers

A glass container is knocked off a shelf at a height of 1.4 meters above the floor beside you. It takes you 0.35 seconds to react to the falling object and reach out your hand in an attempt to catch the container. Will you be able to reach the container before it hits the floor?

A car is initially travelling at 5.0ms-1. It then speeds up, accelerating at 1.2 ms-2 for 4.0 seconds. Explain an action reaction pair that would be experienced in this acceleration.

A car is initially travelling at 5.0ms-1. It then speeds up, accelerating at 1.2 ms-2 for 4.0 seconds. What is the cars final velocity?

A 50 kg person steps on a scale while holding a 5 kg cat. What does the scale read in pounds? (Assume 1 pound equals 4.5 N

Consider an object initially thrown at a 45 degree angle above horizontal. The object has an initial vertical velocity of 19.6 m/s. Neglecting air resistance, give the vertical and horizontal velocities and vertical and horizontal accelerations at each time 0 seconds, 1 second, 2 seconds, 3 seconds and 4 seconds

Barbara is dragging a 24.0 Kg log up a hill. The hill has a 26.0 degree angle with the horizontal. with what force must she pull in order to make the log accelerate at 2.00 m/s towards the top of the hill

A man heard the echo of his voice by a cliff 3secs later. What is the velocity of sound in air if the cliff is 510m away.

The electrostatic force between two point charges is 4.7 x 10-5 N. If the distance between them is tripled, the charge of one of the points triples and the charge of the other point halves. What will be the force between them?

A neutron in a particle accelerator moves at a speed of 0.65c. What is its total energy in the laboratory frame of reference?

A Tyrannosaurus is pulling on the body of a freshly killed, 6,000 kg Ankylosaurus with a force of 25,000N to the North. A second Tyrannosaurus is pulling to the East with a force of 15,000N…

a. What force of static friction must be present between the Ankylosaurus and the ground to make the net force zero?

b. What is the coefficient of friction between the Ankylosaurus armored skin and the ground?