When a shade is pulled over a clear window, it blocks all the light from passing through. Before the shade was pulled down, the window was. With the shade down, the window and shade together are.

How does an increase in thermal energy affect molecules?

How much does it cost to leave a porch light on all night?

If a spring has a spring constant of 2N/m and it is stretched 5cm, what is the force of the spring?

A 500-kg elevator is pulled upward with a constant force of 5500 n for a distance of 50.0 m. what is the work done by the weight of the elevator?

A spring with a spring constant of 4.0 newtons per meter is compressed by a force of 1.2 newtons. What is the total elastic potential energy stored in this compressed spring? (1) 0.18 J (3) 0.60 J (2) 0.36 J (4) 4.8 J

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.