A book with a mass of 1.2 kg sits on a bookshelf. If it has a gravitational

potential energy of 50 J, how high is the shelf? The acceleration of gravity is

9.8 m/s2

A. 1.2 m

B. 4.3 m

C. 5.9

D. 2.7 m

A crate falls from an airplane flying horizontally at an altitude of 2,000 m. Neglecting air drag, how long will the crate take to strike the ground?

Salinity of sea water is usually measured in parts per

Who created the structuralism school?!

Robert, a stuntman, projects himself from a height of 50.0 meters in a horizontal direction. He safely lands at a horizontal distance of 100.0 meters. Calculate the horizontal velocity with which Robert projected himself.

Adams of elements that are in the same group have the same number of

True or False? a globular cluster is a group of older stars that are clustered together.

The doppler effect is the change in observed frequency due to

Which of the following is NOT a vector quantity? (A) Acceleration (B) Average velocity (C) Linear momentum (D) Potential energy (E) Force

Which of Newton's laws of motion is demonstrated by a hammer pounding a nail into a board

Heated air molecules in a hot air balloon soon carried thermal energy to the top of the balloon. this is an example of ... conduction. Convection. Radiation. Cooling.