how do scientists know that black holes exist A. by running experiments on the sun B. by observing objects and light around black holes C. by viewing black holes with powerful telescopes D. all of the above E. none of the above

Energy stored in the nucleus of an atom is called

A car and driver weighing 7130 N passes a sign stating ... ? "Bridge Out 32 m Ahead." She slams on the brakes, and the car decelerates at a constant rate of 13.8 m/s^2. The acceleration of gravity is 9.8 m/s^2.

According to Coulomb's law, the force between two charges acts along the straight line joining the charges.

If you want quick access to large amount of data, you would use a a. line graph b. histograph c. pie graph d. table

The average height of an apple tree is 4.00 meters. How long would it take an apple falling from that height to reach the ground? Given: g = - 9.8 meters/second2

Define the law of conservation of momentum in one sentence

A shopping cart rolls from x=19.9m to x=5.40m with an average velocity of - 0.418m/s. How much time did it take? (unit=s)

Where does the energy of a nuclear power plant come from?

When the vapor pressure of a liquid is equal to the atmospheric pressure the liquid?

Both high-side pressures and low-side pressures are low with the engine running and the selector set to the air-conditioning position. Technician A says that the system is undercharged. Technician B says the cooling fan could be inoperative.