Bill does 1500 j of work on a leaver, which is a simple machine. The lever does 1350 j of work on a stone. What is the efficiency of the leaver?

The weigth of a body decrease in a coal mine why?

You weigh 680 N. What would you weigh if the Earth were seven times as massive as it is and its radius were six times its present value? Answer in units of N.

A Imagine you derive the following expression by analyzing the physics of a particular system: v2 + 2az. The problem requires solving for z, and the known values for the system are a 2.55 meter/second, to = 21.8 meter/second, and u = 0 meter/second.

Solve for w. E = hf-w w=? 1) E/hf 2) - E/hf 3) E + hf 4) hf - E

On your first trip to Planet X you happen to take along a 210 g mass, a 40-cm-long spring, a meter stick, and a stopwatch.

Unpolarized light with intensity 300 W m2 is incident on three polarizers, P1, P2, and P3 numbered in the order light reaches the polarizers. The transmission axis of P1 and P2 make an angle of 45?.

Which of these is not an example of a physical change? a. a nail rusting b. a rock cracking c. blowing up a balloon d. stretching a piece of clay

The rate at which veloity changes over time is known as - Question options: A. speed B. acceleration C. Newton D. force

Scientific method definition

An unwary football player collides with a padded goalpost while running at a velocity of 7.50 m/s and comes to a full stop after compressing the padding and his body 0.350 m. (a) What is his deceleration? (b) How long does the collision last?