Which medium could NOT transmit a mechanical wave? A. air B. rope C. vacuum D. metal bar

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.

Which of the following is NOT a physical mechanism that causes air to rise? A) orographic liftingB) frontal wedging C) adiabatic coolingD) convergence

Determine the amount of heat transfer required to convert 200 g (0.200kg) of ice to vapor if the initial temperature of the ice is25 degrees C and the final temperature is 100 degrees C. Note thatthere is a 50 g (0.

The strength of an electromagnet can be altered by A. using AC current. B. increasing the number of coils around the core. C. increasing the diameter of the wire wrapped around the core. D. using DC current.

Why are satellites placed into orbit at least 150 km above Earth's surface?

A chemical bond formed when Adams share three pairs of electrons is A. an ionic bond B. a single bond C. a double bond D. a Triple bond

A 1100 kg car rounds a circular turn of radius 24.6 m. Of the road is flat and the coefficient of static friction between the tires and the road is 0.59, how fast can the car go without skidding

What is the momentum of a 15 kg tire rolling down a hill at 3 m/s? 5 kg • m/s 18 kg • m/s 45 kg • m/s 60 kg • m/s

Which of Newton's laws, when combined algebraically with his law of universal gravitation, can be used to calculate Earth's mass? A) first B) second C) third

Why does a balloon filled with helium rise while a balloon filled with an equal volume of average atmospheric air does not? A. Helium has no mass, but air does. B. Helium increases the balloon's mass more than air. C.