Composed of silicates and other materials

When observing an object, such as a space ship that is moving very quickly relative to you, the length of objects on that object will appear to be

A) longer than when they are at rest. B) the same length as when they are at rest. C) shorter than when they are at rest. D) narrower than when they are at rest. E) wider than when they are at rest.

A wave moves in a rope with a certain wavelength. A second wave is made to move in the same rope with twice the wavelength of the first wave. The frequency of the second wave is half the frequency of the first wave

a. True b. False Indicate whether the statement is true or false

When a car goes around a curve at twice the speed, the centripetal force on the car doubles

a. True b. False Indicate whether the statement is true or false

The spiral structure of the Milky Way is best revealed by ________ cm radio observations of HI regions

Fill in the blank(s) with correct word