Two atoms that are isotopes of one another must have a different number of what?

electrons

neutrons

protons

all particles

The spring constant, k, for a 22cm spring is 50N/m. A force is used to stretch the spring and when it is measured again it is 32cm long. Work out the size of this force. the

A 4 kg object possesses 18 J of kinetic energy. What is its velocity?

The gravitational force on a baseball is 1.4 N. What is its mass? Round to two decimal places.

The driver of a car applies the brakes for 4.0 s. As a result an average force of 7500N is exerted in the car to slow it down. What is the change in momentum of the car.

Identify one phase change you would see in a root beer float and describe what causes this change.

Which universal force acts on protons and neutrons in an atom's nucleus?

How many turns are in the secondary coil of a step up transformer that increases voltage from 30 V to 150 V and has seven turns in the primary coil?

What is a nuclear bulge? a) The bulging corner of a spiral galaxy consisting of gas in the shape of a spiral sphere that circles a galaxy b) The bulging center of a spiral galaxy consisting of debris in the shape of a flattened sphere that circles a

Your friend of mass 50 kg can just barely float in fresh water. Calculate her approximate volume.

A flashlight beam strikes the surface of a pane of glass (n = 1.50) at a 61° angle to the normal. what is the angle of refraction?