A boy drops a 0.10 kg stone down a 150 m well and listens for the echo. The air temperature is 20°C. How long after the stone is dropped will the boy hear the echo? The speed of sound through air at 20°C is v = 343 m/s.

Which of the following could be described as "Energy cannot be created or destroyed, only converted into other forms"? A. Rebound-crumple theorem B. Impulse-momentum theorem C. Law of conservation of energy D. Law of conservation of momentum

What is the frequency of an electromagnetic wave that has a wavelength of 4,000m?

A ball rolls off a 1.5 m tall horizontal table and lands on the floor. 70 m away. What is the ball's velocity while it was on the table top?

Which of the following correctly compares a scientific investigation to a demonstration

if two objects at a different temperatures are in contact with each other, what happens to their temperatures

Does the air exert a buoyant force on all objects in air or only on objects such as balloons that are very light for their size?

At what temperature (in K) will 1.0 mol of gas occupy 1.0 m3 at a pressure of 1.0 * 10^4 pa

Which best compares freezing and condensation? a. Both involve changes between liquids and gases. b. Both involve changes between gases and solids. c. Both involve the release of heat. d. Both involve the absorption of heat.

The forklift exerts a 1500 N force on the box and moves it 3 M forward to the stack how much work does the forklift do

In which situation would a space probe most likely experience centripetal acceleration?