Why do we apply oil on door hinges

A moon of radius, R moon is orbiting a planet which has a radius, Rplanet. Given Rplanet plus the radius and the period of the moon's circular orbit, it is posible to calculate 1) acceleration of gravity at the surface of both the moon and the

When moving detainees by rail each car should be searched?

An object has a constant momentum of 2.45x10^2 kg m/s. Determine the momentum of the object if its mass decreases to 1/3 of its original value?

What is massand its si unit

What is one of Kepler's laws of planetary motion? a. Planets move on elliptical orbits with the Sun at one focus. b. Gravitational force between two objects decreases as the distance is squared. c. An object in motion remains in motion. d.

Contrast balanced and unbalanced forces.

A wave will travel only as long as it has energy

a box sliding on a frictionless surface when it suddenly begins to rain heavily. if the downpour of rainfall falls vertically into the box, gradually filling it, what would happen to the speed of the box

Which would fall with a greater acceleration in a vacuum-a leaf or a stone?

A force acts on a 5kg object at rest. How fast will the object accelerate on a frictionless surface? A.) 4 m/s^2 B.) 15 m/s^2 C.) 25 m/s^2 D.) 100 m/s^2