When a person bends an arm a different muscle is used to bring it back to the original position. why can't the same muscle be used to both bend and unbend the arm?

If each washer has a mass of 4.9 g, then the mass of two washers in kilograms would be.

An exercise program that lacks specific goals is failing what fitness principle? A. specificity B. progression C. overload D. none of the above

You push a ball to start rolling it across a frictionless surface how far will the ball roll?

The biggest difference between a motor and a generator is that, in a motor, current passes a power source, through the brushes, then the commutator.

Striving to reach goals is an important part of personal growth. True False

Copernicus and Kepler were astronomers who had proposed theories about the solar system. Copernicus believed that Earth and other planets circled a stationary sun. Kepler believed that the sun rotated like planets.

In which one of the following locations can a person hear the echo of a sound? *A. * Less than 16.6 meters in front of the reflecting surface *B. * At least 33.2 meters behind the reflecting surface *C. * Less than 33.

A hot-air balloon is 150 feet above the ground when a motorcycle passes directly beneath it (traveling in a straight line on a horizontal road). The motorcycle is traveling at 40 mph.

When is a body said to be at rest

What should i put on a greeting card for the birth of quartzite