At a construction site, the site manager notices that a crane takes 20 seconds to lift a 500kg steel beam up to a height of 15 meters. From this information, he calculates the power output of the crane to be what value?

What is the name of the line drawn perpendicular to the surface where a light ray strikes? a. incoming ray c. normal b. reflected ray d. vertical

Wave C has an amplitude of 1 and wave D has an amplitude of 3 as shown below. What will happen when the trough of wave C meets the crest of wave D?

Convection currents on the Earth are created by the moon and wind energy A. True B. False

What is the average velocity of a dragster that starts from rest at the starting line and finishes a race at 2600 m/s in 12 seconds?

Radiation with a wavelength of 238 nm shines on a metal surface and ejects electrons that have a maximum speedof 3.75 X 105 m/s. Which one of the followingmetal is it, the calues in paretheses being the work functions: a) potassium (2.

In what ways does a river carry its load?

What is a unit of mass?

Which is not an era of the Phanerozoic eon

Newton's third law states that when an object exerts a force on another object, the second object exerts an equal but opposite force on the first object. Which of the following shows an example of this? a.

A car is moving 14.4 m/s when it hits the brakes. It slow from 78.8 m, which take 9.92s. It then accelerates at 1.83 m/s 2 for 4.50 s. What is the total displacement?