Why do we use change of distance instead of just distance when calculating for speed and velocity?

What is the escape speed of an electron launched from the surface of a 1.1-cm-diameter glass sphere that has been charged to 8.0 nc?

A woman falls to the ground while wearing a parachute. The air resistance of a parachute is 500N. If the woman falls at a constant rate of 5m/s, then the gravitational force on her is

Which of the following is measured using the Saffir-Simpson scale?

Imagine that you're standing in a large room when a loud noise is made. You begin hearing a series of echoes. Which characteristic of sound best explains what just happened?

Electromagnetic waves have linear momentum as well as energy. What does this imply about electromagnetic waves?

A rod of mass M and length L can rotate about a hinge at its left end and is initially at rest. A putty ball of mass m, moving with speed V, strikes the rod at angle θ from the normal and sticks to the rod after the collision.

A satellite with a mass of 2,000 ㎏ is inserted into an orbit that is twice the Earth' s radius. W hat is the force of gravity on the satellite? The radius of the Earth is 6380 km, and the mass of the Earth is 5.98 X 1024 kg a. 2,000 N h.

our canisters contain helium gas. If all the canisters had the same amount of particles, which canister would have the fastest moving particles?

The acceleration due to gravity is

How does gravitational force and electric force compare?