1. When an object moves it acquires

(a) friction

(b) traction

(d) speed

(c) energy of motion

The work function of a metal is 1.98 ev. what is the threshold frequency of the metal in hz?

Part A Which of the following statements is/are true? Check all that apply. (A) The SI unit of power is the watt. Power is the rate at which work is done.

What does the solar system consist of?

Are there any difference betwn supersonic planes and concorde planes

Explain the process of synaptic transmission, beginning with the neurotransmitters at the axon terminal of the presynaptic cell and ending with the impulse being sent down the postsynaptic cell.

Two copper wires with different diameters are joined end to end. If a current flows in the wire combination, what happens to electrons when they move from the larger-diameter wire into the smaller-diameter wire?

A baseball player is warming up and tosses a ball straight up into the air. The ball travels up until it reaches some maximum height, and then falls back down to the player/'s hand.

Volume can be measured in liters or cubic meters. a. T b. F

A spring with a spring constant of 1200 N/m has a 55-g ball at its end. The energy of the system is 5.5J. What is the amplitude of vibration?

Force F1 acts on a particle and does work W1. Force F2 acts simultaneously on the particle and does work W2. The speed of the particle does not change. Which one of the following must be true? a. W1 is zero, and W2 is positiveb. W1 = - W2c.