A group of two or more stars is called a A. solar system B. neutron star C. protostar D. star system

An echo is an example of A. Refraction B. Diffraction C. Reflection D. Destruction

An object has a kinetic energy of 175 J and a momentum of magnitude 25.0 kg m/s. Find the speed of the object.

A jar of tea is placed in sunlight until it reaches an equilibrium temperature of 31.6°C. In an attempt to cool the liquid, which has a mass of 173 g, 120 g of ice at 0.0°C is added.

Matt is driving down 7th street. He drives 150 meters in 18 seconds. Assuming he does not speed up or slow down, what is his speed?

Find the magnitude of the vector 33 i^ + 15 j^m.

Jessica took a Mylar balloon outside on a very hot day. As she waited for the bus the balloon began to get bigger. What is the best explanation of this?

Describe how electricity flows through a simple closed circuit.

Solar energy is produced by A. fusion of light nuclei to make heavier ones B. the slow release of heat left over from the Sun's formation C. fission of heavy nuclei into lighter ones D. solar magnetism

A 72-kg fisherman in a 114-kg boat throws a package of mass m = 15 kg horizontally toward the right with a speed of vi = 5.0 m/s.

Roberto creates an animation titled "Flying through an Atom." The animation makes it seem as if the viewer passes all the way through an atom, starting from one side, then through the atom's center, and then leaving through the other side.