Voltage sources are used to sustain

a. the flow of protons

b. chemical reactions

c. resistance

d. the movement of electric charge

A horse running at 4.0 m/s accelerates uniformly to a velocity of 18 m/s in 4.0 s. What is its displacement during the 4.0 s time interval?

Bullets bounce from Superman's chest. Suppose that Superman, with mass 104 kg, while not moving, is struck by a 3.93 g bullet moving with a speed of 855 m/s. The bullet drops straight down with no horizontal velocity.

A schooterist move along a circular path for radius 0.2km for 2 minutes A) what is the distance travelled B) what is the velocity of the schooterist

Which best explains why sound travels faster through a solid

Which of the following types of radiation can penetrate through paper but not through wood? Alpha rays Beta rays Gamma rays Proton rays

Objects can be accelerating and traveling at constant velocity at the same time. True or False

What kind of star gives rise to a type i supernova? a. white dwarf stars b. massive main sequence stars c. red giant stars?

Example of an object in motion

A proton and an alpha particle are momentarily at rest at a distance r from each other. They then begin to move apart. Find the speed of the proton by the time the distance between the proton and the alpha particle doubles.

Why is it a good idea to extend your bare hand forward when you are getting ready to catch a fast-moving baseball? a. So you can catch the ball with a stiff arm, increasing the time to slow the ball thus deceasing the force. b.