A perpetual motion machine can never be built because it is not possible to eliminate

A) Momentum

B) Inertia

C) Elasticity

D) Friction

Anna needs to move a box of paperback books across the room. If she applies a force of newtons to the box, what is the magnitude of the force exerted by the box on Anna?

1. A surfer moving with an initial speed of 1.5 m/s catches a wave and accelerates at a constant rate of 2.1 m/s2 for 2.2 s. a) How far does the surfer travel in those 2.2 seconds? b) What's the velocity of the surfer at the end of those 2.

If the vertical component of velocity for a projectile is 7.3 meters/second, find its hang time.

What is the kinetic energy of a 0.50 g insect traveling in a straight line at 5.0m/s? a) 6.25J b) 1.25J

When an atom that has no charge loses 2 electrons what happens?

A solar eclipse occurs when positions of the sun, moon, and earth are such that one of these objects is between the other two. during a solar eclipse, which object is between the other two? a. sun c. earth b. moon d. none of the above

One tuning fork vibrates at 440 Hz, while a second tuning fork vibrates at an unknown frequency. When both tuning forks are sounded simultaneously, you hear a tone that rises and falls three times per second.

A block sliding along a horizontal frictionless surface with speed v collides with a spring and compresses it by 2.0 cm. What will be the compression if the same block collides with the spring at a speed of 2v?

How does work get affected when a object is lifted up instead of using a ramp

Choose the correct statement. a. Usually, when one form of energy is converted to another, no energy is wasted. b. The total amount of energy in the universe is gradually decreasing. c. This statement illustrates the first law of thermodynamics. d.