Light waves

A) Do not require a medium

B) can not travel through a vacuum

C) are not electromagnetic radiation

D) do not travel in straight lines from the source

A 2.00-m rod of negligible mass connects two very small objects at its ends. The mass of one object is 1.00 kg and the mass of the other is unknown. The center of mass of this system is on the rod a distance 1.60 m from the 1.00-kg mass object.

Which type of bond (ionic, covalent, or metallic) does the phrase "opposite attract" apply to best? Explain.

What bond does ethanol use

A horse runs for 15 seconds to the south at a speed of 12 m/s. What is the displacement of the horse in this time? A. 180 m south B. 150 m south C. 150 m D. 180 m

A 1,000 kg car has 50,000 joules of kinetic energy. What is it's speed

A stretched spring has 5184 J of elastic potential energy and a spring constant of 16,200 N/m. What is the displacement of the spring?

A block of mass 1.3 kg is resting at the base of a frictionless ramp. A bullet of mass 50 g is traveling parallel to the ramp surface at 250 m/s. It collides with the block, enters it, and exits the other side at 100 m/s.

Metals are good thermal conductors - that is, when there is a temperature difference across their ends, they transfer energy very efficiently from the higher temperature end to the lower temperature end.

Some stars are so far away that their light hasn't reached Earth yet. A million years in the future, will the sources of light we see when we look up at night be the same? Why or Why not?

A sound wave travels through water. What best describes the direction of the water particles?