A tennis ball travels the length of the court 24m in 0.5 s find its average speed

Which are sources for thermal energy for a heat pump? Check all that apply. air water sunlight ground fire

Which of the following correctly describes the result Charges move randomly Charges do not move Charges flow from low voltage areas to high Charges flows from high voltage areas to low

A speed boat travels with a speed of 6 m/s travels directly north to cross a river flowing west with a current traveling at a speed of 3 m/s. What is the resultant velocity of the boat?

What is the molality of a solution that contains 54 grams of NaOH dissolved in 1.50 kg of water? (The molar mass of NaOH 40.00 grams/moles.)

A student fires a cannonball horizontally with a speed of 39m/s from a height of 73m. Neglect drag. What was the cannonball's initial horizontal speed? What was the cannonball's initial vertical speed? How long did the ball remain in the air?

Bus A and Bus B leave school on a field trip when a stopwatch reads zero. Bus A travels at a constant 50 km/h, and Bus B travels at a constant 75 km/h. How far are the two buses from school when the stopwatch reads 1.5 h?. a ... Bus A is 76.

When observed from Earth, the wavelengths of light emitted by a star are shifted toward the red end of the electromagnetic spectrum. Why does this redshift occur?

Object A has a length of 3 cm, a width of 10 cm, and a height of 2 cm. Object B is dropped into a graduated cylinder. It displaces 60 mL of water. The volume of object A is:

Is the following sentence true or false? Some information about an object or process may be missing from a model.

If V is a velocity, l a length, and v a fluid property having dimensions of L2T-1, which of the following combinations are qualitatively dimensionless (show work for a through d) : (a) V l v (b) Vl/v (c) V2v (d) V / (l v)