A student pulls a lever down 4 m. The lever lifts a box that weighs 20 N up a distance of 2 m. How much work was done on the box?

An object goes from a speed of 9 m/s to a total stop in 3 s. what is the object's acceleration

Why is it important to develop alternative energy sources

Which major figure in the history of astronomy developed laws of gravitational forces and motion, making extremely accurate calculations and predictions possible? a. Brahe b. Kepler c. Galileo d. Newton

True or false mechanical waves need a medium through which to transport energy

How long does it take for earth to revolve around the sun?

An automobile having a mass of 2000 kg deflects its suspension springs 0.02 m under static conditions. Determine the nafural frequency of the automobile in the vertical direction by assuming damping to be negligible.

Samantha is checking the weather for her upcoming trip to Mexico City. The weather forecast predicts a high-pressure system for the four days of her trip. What kinds of conditions can she expect?

Compare the life cycles of flower less seed plant and flowering seed plants

A clock moves past you at a speed of 0.9 c. How much time passes for you for each second that elapses on the moving clock? 0.436 s 1.15 s 2.29 s infinity

A 0.18-kg ball on a stick is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, the stick's tension is 19 N.