Which change indicates that the universe is expanding?

The force between two charges is 10 N. If the distance between the two charges is halved, what is the new force between the charges?

Which kind of star is most likely to spend the longest time on the main sequence? A.) A low-mass red star B.) A yellow star like the sun C.) a high-mass blue star D.) a bright white star

While floating in space a 100.-kg robot throws a 0.800-kg wrench at 12.0 m/s toward its human partner working on the spaceship. How fast will the robot recoil?

What happens to the period of a pendulum and the period of a spring as the amplitude of the oscillation increases? Briefly give an explanation for this relationship.

Describe the time of day that an early explorer might have planned to enter a harbor and when he might have planned to leave

Voltage can exist without A. current. B. resistance. C. a closed circuit. D. all of these

During a football game, a receiver has just caught a pass and is standing still. Before he can move, a tackler, running at a velocity of 2.60 m/s, grabs and holds onto him so that they move off together with a velocity of 1.30 m/s.

What effect does an increase in temperature have on viscosity?

Aman tosses a jart upward with a velocity of 14.1 m/s a 60° angle

Describe accuracy, precision and best fit line.