If an object is at rest can we conclude that no external forces are acting on it. True or False

A very elastic rubber ball is dropped from a certain height and hits the floor with a downward speed v. Since it is so elastic, the ball bounces back with the same speed v going upward. Which of the following statements about the bounce are correct

Shining a beam of light on a metal has no effect. What change would be most likely to cause the ejection of electrons from the metal. Choose all that apply. Group of answer choices Increase the intensity of the light.

An object of mass 1000 kg, initially having a velocity of 100 m/s, decelerates to a final velocity of 20 m/s. what is the change in kinetic energy of the object, in kj?

Can been seen but not projected?

How is pressure caused? and how it varies depending on the environment, use an example of a balloon

Inside a stereo speaker, you will find two permanent magnets: one on the cone and one near the cone. True of false?

When a hurricane nears land what causes the most damage

Calculate if an electric hair dryer uses 2,400 j of energy in 2 s, what is its power?

Which of the following choices best represents a potential stressor?

How do you distinguish between speed, velocity, and acceleration?