When two objects collide, they exert forces on each other that change momentum

a. law of conservation of momentum

b. recoil

c. relation of Newton 3rd law to momentum

d. closed system

Why are renewable sources of energy better than nonrenewable sources?

Two speakers hang from racks placed in an open field. When sound of the same frequency comes from both speakers, no sound is heard in some locations. The sound is loud in other places at about the same distance from the speakers. Explain.

What is the closest distance you should live from the airport runway to preserve your peace of mind?

In walking across a carpet, you acquire a net negative charge of 50 µC. How many electrons do you have?

A mango is dropped and fall freely from rest. What are its position and velocity after 1.0secs, 2.0secs, and 3.0secs

At one instant, the center of mass of a system of two particles is located on the x-axis at 2.0 cm and has a velocity of (5.0 m/s) ˆx. One of the particles is at the origin. The other particle has a mass of 0.

A 91 kg block is released at a 6 m height as shown. The track is frictionless. The block travels down the track, hits a spring of force constant k = 1968 N/m. The acceleration of gravity is 9.

Why do charges build up on clothing in an electric dryer?

Two plates with area A are held a distance d apart and have a net charge + Q, and - Q, respectively. Assume that all the charge is uniformly distributed on the inner surfaces of the plates.

A circuit contains two 2,000 resistors connected in parallel. What is the total resistance of the circuit?