You exert of force of 75 newtons on a rock. You push and you push, but you can't budge it. You are exhausted! How much work did you perform?

Which best explains why sound travels fastest through a solid? A. Sound is a mechanical wave, so closer molecules in the medium cause energy to transfer faster. B.

Justin designed an experiment to find out how running up bleachers affects his heart rate. First he records his resting heart rate and then runs up the bleachers 10 times. Each time he reaches the top, he records his heartrate then rests 20 minutes.

Which of the following is a dimensioning guideline? A. Use the least number of dimensions needed. B. Always dimension hidden lines. C. Put dimensions inside of objects. D. Line dimension numbers up in a row.

Calculate the average speed in meters/minute for the trip represented by the walk graphed here. A) 0.5m/min B) 1m/min C) 5m/min D) 30m/min

How do refracting and reflecting telescopes use convex lenses and mirrors

How much work does an elephant do while moving a circus wagon 20 meters with a pulling force of 200n

Which is the best description of the acceleration of an object? an airplane changes elevation from 10,000 ft to 5,000 ft a cars velocity changes from 25 m/s to 20 m/s in 5 seconds a runner travels 100 m in one minute a remote-control car speeds up

What is the mechanical advantage of a machine that exerts a force of 160 N on an object when a person exerts a force of 20 N on the machine?

Suppose your hair grows at the rate of 1/55 inch per day. Find the rate at which it grows in nanometers per second. Because the distance between atoms in a molecule is on the order of 0.

A water skier is pulled behind a boat. When the skis push down on the water, what is the reaction force? A. The skier pulls back on the boat. B. Earth's gravity pulls down on the skis. C. The water pushes up on the skis. D. The boat pulls the skier.