With the crate stationary on a horizontal ramp, the force of static friction is: a. directed to the left.
b. zero.
c. directed to the right.

Which radioisotope is used in dating geological formations?

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2. a. 9.5 m b. 11.9 m c. 15.2 m d. 23.8 m

Provides most of the energy used in the world today. question 4 options: wind fossil fuel moving water sunlight