Luis weighed 80 pennies and found out they have a total mass of 240 grams. what is the mass of one penny?

Gerald works on a futuristic space station servicing interstellar space ships. He observes a ship traveling directly away from the space station at a speed of 0.6c. The ship launches a shuttle towards the space station with a speed of 0.

How many foot-pounds of work does it take to throw a baseball 90 mph? a baseball weighs 5 oz, or 0.3125 lb?

What length of tube would be required to produce a second tone under the same experimental conditions? Explain your answer.

Earth revolves on its own axis. true false

As you (increase, decrease) in altitude, air pressure decreases.

What conditions are required for nuclear fusion that prevent it from being used to generate electric energy?

What conditions in the nucleus are likely to result in the nucleus breaking apart? A. When the repulsion of the strong force is weaker than the repulsion of the electrostatic force B.

What color do you see when all colors of light are reflected

A ball is thrown with a velocity of 20 m/s at an angle of 60 degrees above the horizontal. What is the horizontal component of its instantaneous velocity at the the exact top of its trajectory?

You pull on a wagon resting on the sidewalk. What will happen next. A. The wagon does not move because the wagon applies more force to you than you apply to the wagon. B. The wagon moves because you apply more friction to the ground. C.