Mechanics | Relativity Answers

Shawn and his bike have a total mass of
57.9 kg. Shawn rides his bike 0.91 km in
12.5 min at a constant velocity.
The acceleration of gravity is 9.8 m/s2.
What is Shawn’s kinetic energy?
Answer in units of J.
Don't round answer

This question is typical on some driver’s license exams: A car moving at 40 km/h skids
15 m with locked brakes.
How far will the car skid with locked brakes
at 100 km/h? Assume that energy loss is due
only to sliding friction.
Answer in units of m.
Don't Round answer.

Hi,does The net force only consist of applied force and frictional force in One dimension and in two dimension consisting of applied force friction force and gravity’s parallel force?

Calculate the elastic potential energy when a 1000N/m spring is stretched by a 20N force

It takes a certain satellite exactly 1.9 hours to orbit the Earth. Find:
a) the period of the orbit in seconds
b) the orbital radius
c) the centripetal acceleration
d) the angular velocity
e) the orbital velocity
f) the altitude of the satellite above Earth’s surface

1. A disk with a diameter of 18 cm is spun at a constant rate. The disk rotates 9 times every 1.3 seconds
a) What are the frequency and period of rotation?
b) What is the angular velocity in radians/sec?
c) What is the tangential velocity of a point on the edge of the disk?

Use your knowledge of geometry (and/or trigonometry) to show that the
angle α between the worldline of an inertial observer and the lightcone
(drawn in an inertial frame using units in which light rays travel at 45
degrees) is the same as the angle β between that observer’s line of si-
multaneity and the lightcone. (Hint: Many people find it easier to use
trigonometry to solve this problem than to use geometry).

A person's hand pushed down with a force of 40.0N on a 8.50kg book that is sitting on a table. what is the magnitude of the normal force on the book? what is the magnitude and direction (in words) of the force on the person's hand due to the book ?

a 76.5N block is being held in place by static friction on a ramp that makes an angle of 35.7 degree with the horizontal. what is the magnitude of the normal force on the block ?