Which term identifies a scalar quantity?

(1) displacement (3) velocity

(2) momentum (4) time

The state of illinois cycle rider safety program requires motorcycle riders to be able to brake from 30 mph (44 feet/second) to zero in 45 feet. what constant deceleration is required to do that?

In a science museum demonstration, a person on an insulated stand touches a metal sphere. the sphere has a large charge. explain why the person's hair stands on end

The greatest problem facing the use of nuclear power plants is:

A thin copper rod that is 1.0 m long and has a mass of 0.050 kg is in a magnetic field of 0.10 t. What minimum current in the rod is needed in order for the magnetic force to cancel the weight of the rod?

A body will maintain a constant negative electrostatic charge if the body A) maintains the excess of electrons B) continously receives more protons than it loses C) continuously receives more electrons than it loses D) maintains the same excess of

When the volume increased, what happened to the density?

8. Chemical weathering occurs more rapidly in what kind of climates? A. Desertlike B. Cold with high snowfall amounts C. Cool and dry D. Warm with abundant rainfall

Recoil is noticeable if we throw a heavy ball while standing on a skateboard. If instead we go through the throwing motion but hold onto the ball, without friction effects our net recoil will be A) zero. B) the same as before.

If an electromagnet is used to pick up nails and other metal objects, what happens when the current is turned off?

An electron enters a region of uniform perpendicular en and bn fields. it is observed that thevelocity nv of the electron is unaffected. a possible explanation is: