Mechanics | Relativity Answers

Distinguish between static and sliding (kinetic) friction and define the coefficient of sliding friction. How would you investigate the laws of sliding friction between wood and iron?

A block of wood of mass 150 g rests on an inclined plane. If the coefficient of static friction between the surfaces in contact is 0.30, find (a) the greatest angle to which the plane may be tilted without the block slipping, (b) the force parallel to the plane necessary to prevent slipping when the angle of the plane with the horizontal is 30 degrees

The force between two molecules may be regarded as an attractive force which increases as their separation decreases and a repulsive force which is only important at small separations and which there varies very rapidly. Draw sketch graphs
(a) for force-separation.
(b) for potential-energy separation.
On each graph, mark the equilibrium distance and on (c) indicate the energy which would be needed to separate two molecules initially at the equilibrium distance. With the help of your graphs, discuss briefly the resulting motion if the molecules are displaced from the equilibrium position.

Show that fo = 1/2l[sqrt(T/u)] is homogenous

with airplane cruising 30,000ft, the navigator indicates to the captain that the plane should continue travelling north for 500 km and then turn to a heading of 45.0° east of north for 200 km. what will be the resultant distance traveled?

1)the standard kilogram is a platinum -iridium cylinder 39.0mm high and 39mm in diameter.what is the density of the material
2) how many grams of copper are required to make a hollow spherical shell having an inner radius of 5.70cm and an outer radius of 5.75cm ?The density of copper is 8.92g/cm³.
3)suppose your hair grows at 1/32inches perday,find the rate at which it grows in nanometes per seconds.

A person drives back and forth. They start 20 meters away from you at a pace of 10 m/s for 3 seconds, then stand still for 2 seconds, then drive back towards you at a pace of 20 m/s for 3 seconds.

An engine is able to provide 1000 N of propulsion (applied ) force , causing a vehicle to experience an acceleration of 4.50 m/s ^ 2 If the vehicle's mass doubles and the propulsion force remains constant , what is the new acceleration ?

The rotor is an amusement park ride where people stand against the inside of a cylinder. Once the cylinder is spinning fast enough, the floor drops out.

If the coefficient of static friction between a person and the wall of the cylinder is 0.600 and the cylinder has a radius of 3.80 m, what is the minimum angular speed of the cylinder so that the people don’t fall out?