The pressure differences that make wind happen are caused

a. by a sudden drop in humidity.

b. when water vapor in the air rises then falls.

c. by accumulations of clouds in different areas.

d. by the unequal heating of earth's surface.

An orange is placed on a table in a completely dark room, without any source of light. Which of the following choices correctly describes what an observer will see as he looks in the direction of the orange?

How does an inclined plane work? A A small input force is exerted over a long distance. B A large output force is exerted over a long distance. C The input force is exerted in the direction opposite to the output force.

Which of these statements are characteristic of matter in the gaseous state? gases fill their containers completely. gases exert pressure. gases have mass. the pressure of a gas is independent of its temperature. gases are compressible.

A pendulum has a period of 0.500. What is its length?

In order to keep a vehicle in a turn without allowing centrifugal force to pull the car out, what should you not do? A. Decelerate before the curveB. Brake gently and gradually while turningC. Downshift (manual transmission) D.

Why is it that when you throw a Frisbee, it flies better when it is normally thrown and not upside down?

Four blocks of weights are required using which any body whose weight is between 1kg and 40 kg can be weighed. Find the four weights

Use the graph to determine the instantaneous speed at 2 seconds. m/s What is the average speed over the entire trip? m/s

Most volcanoes are located at A. transform boundaries. B. midocean ridges. C. convergent and divergent boundaries. D. hot spots.

What factors affect the speed of a wave?