The light from the Sun heats a metal surface

What sound signal tells a river lock attendant that you wish to go through the lock?

Suppose that a person riding on the top of a freight car shines a searchlight beam in the direction in which the train is traveling. How does the speed of the light beam relative to the ground compare to the speed of beam when the train is at rest?

Katrina inserts a key into her car ignition she turns the key putting her car into ignition mode. In thos mode energy is used to increase the temperature of the cars fuel this energy allows fuel to combust and the car to move.

A stream of negatively charged particles is called: alpha radiation gamma radiation a cathode ray an X-ray

30N of force is used to raise a box that weight 60N up an incline plane. What is the mechanical advantage of the incline plane?

A particular solid is electrically charged after it is rubbed, but it is not known whether its charge is positive or negative. How could you determine which charge it has by using a piece of plastic and fur?

A mass of 5 kg is moving at 5 m/s when it collides with another mass of 2 kg moving in the same direction at 2 m/s. After the collision they become bonded together. What is the final velocity of the two masses together? 2.22 m/s 6.23 m/s 3.56 m/s 4.

The process of developing a sense of identity during adolescence was highlighted by

Kenna has a mass of 30 kilograms. What's her weight in newtons? Assume that acceleration due to gravity is 9.8 N/kg.

Explain what type of force drag and tailwinds are. If the airplanes were traveling eastward with a force 450 N and there was a tailwind of 200 N, what would the resulting force be on the airplane?