A perpetual motion machine can never be bill because it is not possible to eliminate

a. momentum

b. inertia

c. elasticity

d. friction

A sharpshooter fires a rifle while standing with the butt of the gun against her shoulder. If the forward momentum of a bullet is the same as the backward momentum of the gun, why isn't it as dangerous to be hit by the gun as by the bullet?

An 18-year-old runner can complete a 10.0-km course with an average speed of 4.39 m/s. A 50 - year-old runner can cover the same distance with an average speed of 4.27 m/s.

Electric energy can be transferred into other types of energy we often experiences transformation of energy in our every day lives the example that represents a transformation from electrical to sound energy is

Loess is an example of?

A proton has an initial speed of 3.7*10^5 m/s. a) What potential difference is required to bring the proton to rest? (V) b) What potential difference is required to reduce the initial speed of the proton by a factor of 2?

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.

At room temperature what is the strength of the electric field in a 12-gauge copper wire (diameter 2.05 mm that is needed to cause a 2.75 a current to flow?

A conductor has a net charge of + 24 uC. How many electrons are needed to make this conductor neutral

What does Force Means