Which of the following is a reversible physical change?

a. burning coal

b. boiling water

c. chopping onions

d. bread rising in an oven

State that energy is conserved in any transfer

A girl pulls a sled with a force of 15 N over a distance of 3 m. What is the kinetic energy of the sled after she pulls it? Assume there is no friction.

A force of attraction would exist between A. two positively charged objects. B. a negatively charged object and a neutral object. C. two negatively charged objects. D. a positively charged object and a negatively charged object.

Explain why glass prisms disperse light.

In an arrangement for measuring the muzzle velocity of a rifle or pistol, the bullet is fired up at a wooden mass, into which it embeds. The wood is blasted straight up into the air to a measured height h.

A sonar device on a ship sends ultrasound waves under the water to locate a sunken ship. It takes the ultrasound wave 0.6 seconds to travel from the device to the sunken ship and back again. How far below the surface is the sunken ship?

How can you determine the type of radiation an atom emits as its nucleus decays

The atoms of which elements are most likely to share many electrons among many atoms? Check all that apply.

There are multiple tuning forks present in the room, and Annie strikes one with a natural frequency of 400 Hz.

How would you describe a heavy element to someone who doesn't know what it is?