Which single force acts on an object in free fall?

A. Air resistance

B. gravity

C. Friction

D. fluid forces

A gas-powered lawnmower is rated at 98 db. how many times more intense is the sound of this mower than that of an electric-powered mower rated at 70 db?

Which change occurs when an atom undergoes decay?

Iridium is a substance found only in asteroids and other space objects. This graph shows the amount of Iridium found in different sediment layers of Earth. They are marked off into 17 sections representing time.

Which could an injury to the eardrum most likely cause? increased hearing ability earwax buildup aging decreased hearing ability

Which motion causes the Coriolis effect onEarth? (1) revolution of Earth around the Sun (2) revolution of the Moon around Earth (3) rotation of Earth on its axis (4) rotation of the Moon on its axis When water vapor condenses, how much heatenergy

What happens to the total mechnical energy of the apple as it falls from the tree?

Fair Bonus Question: Derive the equation for gravitational potential energy, starting with the definition of work.

A juggler throws a bowling pin into the air with an initial velocity. Another juggler drops a pin at the same instant.

The liquid electrolyte in the battery typically takes what kind of net charge? a. positive b. negative c. neutral

Relating to Newton's Third Law, action and reaction, what is the reaction when a rocket expels gas, smoke and flames from the nozzle end of the rocket engine?