Mechanics | Relativity Answers

An egg rolls off the edge of a table 1.2-meter-high and strikes the floor at a

point 2 meter horizontally from the edge of the table.

A spring is fixed to a wooden board with 2 masses suspend from it. The spring has stretched 6 cm. If m₁ = 13 kg and m₂ = 3 kg, what is the spring constant of the spring?

Estimate the maximum velocity of the train in kilometers per hour during the time it moves east ( t = 14 min to t = 23 min). 

How does the elapsed time for a process seem to be longer, an observer moving with the process or observer moving relative to the process? Which observer measures proper time? Explain your answer.

The sweep rate of a tail of a comet can exceed the speed if light. Explain this phenomenon and show that there is no contradiction with relativity.

The force of gravity that acts on an object on

the surface of Mars is 20 N. What force of

gravity will act on the same object on the

surface of the Earth? (use gravitational field

strength g = 9.8 N/Kg on the surface of the

Earth).

A 3.5kg block rest on a horizontal table top. A cord is attached to this block, the cord passing over a pulley at the edge of the table. At the end of the cord is hung another block weighting 5 N. Determine the tension in the cord and the distance the block moved after 2 seconds.

a 12-kg block is acted upon by two forces that are in opposite direction, one a 540 Newton and the other of 1260 N. Determine the acceleration produced. How is the direction of the acceleration related to the forces

How does the elapsed time for a process seem to be longer, an observer moving with the

process or observer moving relative to the process? Which observer measures proper

time? Explain your answer

A sagging floor is jacked up and a steel girder 10.0 feet long whose cross-sectional area is 6.0 inches² is put in place underneath. when a jack is removed, a sensitive strain gauge that shows that the girder has been compressed by 0.0080 inches. Find the load the girder is supporting. (change everything to metric system units and use metric system units)