X (t) = (20-4t^2) m, then what its average velocity in between t=0 and t=2sec?

What is the acceleration of a 0.30-kg volleyball when a player uses a force of 42 N to spike the ball?

Which process requires the addition of energy to water?

what is the best description for the orbit of a natural of a natural or artificial satellite around a planet? A. a parabola B. a circle C. irregular D. ellipsoid

A uniform disk of radius 0.2 m and mass m = 16 kg is mounted on a nearly frictionless axle. A string is wrapped tightly around the disk and pulled with a constant force of F = 1 N. After a while the disk has reached an angular speed of!0 = 1.2 rad/s.

A bouncy ball moves toward a wall at 10 m/s. Ignore friction. What is its final velocity?

For a vacation, you and your family fly east to west from Boston, Massachusetts, to Seattle, Washington. You notice that your flight back home to Boston is shorter than your flight to Seattle. Which phenomenon causes your flight home to be shorter?

You spy on an anchor on the bottom of a lake. What is the direction and amount of force the water exerts on it: a) zero b) up, equal to the weight of the anchor. c) up, less than the weight of the anchor d) down, equal to the weight of the anchor.

How are electromagnetic waves different from matter waves?

A dc generator is the same as a (n) a. electric motor. b. ac generator. c. armature. d. electric current.

Which of the following best describes scientific knowledge A.) Durable B.) Absolute and never changing C.) Frequently varies