According to Newton's first law of motion, what does it take to move an object at rest?

A) a change in gravity

B) a balanced force

C) an unbalanced force

D) a force equal to the force keeping the object at rest, but in the opposite direction

What's it called when a liquid changes to a solid

A tuning fork vibrates at a frequency of 512 hertz when struck with a rubber hammer. The sound produced by the tuning fork will travel through the air as a (1) longitudinal wave with air molecules vibrating parallel to the direction of travel (2)

Determine the kinetic energy of a 55kg woman running with the velocity of 5.87m/s

What is the period of a soundwave whose wavelength is 20.0 m? Use values from the book and show ALL of your work.

What is the centripetal force that would be required to keep a 4.0 kg mass moving in a horizontal circle with a radius of 0.80 meters at a speed of 6.0 meters/second?

Why do charges build up in a cloud

How does the wave model of electrons orbiting the nucleus account for discrete energy values?

An ecosystem is all the populations of organisms that live together and A. the microorganisms that depend on them. B. the organisms that generate energy from sunlight. C. the physical factors with which they interact. D.

Which statement about magnetic poles is accurate? A) Same magnetic poles attract, while different magnetic poles repel. B) Same magnetic poles attract, while different magnetic poles attract.

Power is measured in: A) J/s B) J2/s C) s/J D) s2/J