Two identical rocks are dropped from different heights. The higher one starts out four times as high as the lower one. How much faster is the higher one going just before they hit?

A 0.012 kg ping pong ball placed 1.8 m away from 0.3 kg billbard ball. calculate gravitational force between two objects

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 block of mass 20 kg sits on a ramp with an angle of 31 degrees above the horizontal. Assuming no friction, how fast will the block accelerate down the ramp? 7.89 m/s^2 5.34 m/s^2 2.98 m/s^2 4.17 m/s^2

When a wire is made smaller, the resistance increases. Which happens to the electric current? a) It decreases. b) It increases. c) It stays the same.

What is area and perimeter

What is the role of the air spaces in insulating materials? Select all that apply. They trap heat in the spaces. They puts gaps between the particles to slow down conduction. They dissipate energy faster.

Is it true or false that wave interference only occurs with transverse waves?

There have been several proposed atomic models during the last 150 years. Which model best illustrates the Bohr model. This model suggests that an atom's electrons orbit the nucleus in fixed patterns, much like the planets orbit the Sun.

During which type of change should you expect to see different chemical symbols before and after the change?

Ryan is examining the energy of the particles in a bar of gold. What is Ryan most likely studying? thermal energy electric energy potential energy internal energy