A 25-N force accelerates a boy in

a wheelchair at 0.5 m/s2 What is

the mass of the boy and the

wheelchair?

How long does it take our solar system to complete one orbit around the milky way galaxy?

The frequency of sound will decrease when; A) The source approaches a stationary observer B) The observer approaches a stationary source C) The source recedes from a stationary observer D) The observer recedes from a stationary source E) Both A and

A property that describes how easily a substance undergoes chemical changes

Engineers who design battery-operated devices such as cell phones and MP3 players try to make them as efficient as possible.

Temperature and silica content determine the of magma.

The slope of a velocity versus time graph gives

Which of the following describes subatomic particles? carbon and nitrogen solids, liquids, gases larger than atoms protons, neutrons, and electrons

What is the difference between speed and velocity? A) velocity describes speed with direction. B) there is no difference. C) Velocity describes direction with position. D) Velocity is used in space, while speed is used on earth.

How do you calculate resistance with coulombs, time and J's?

Difference between specific heat capacity and latent heat?