What is the aperture diameter of a 12-mm-focal-length lens set to f/4.0?

How many poles does Jupiter's magnetosphere have? a. 2 c. 8 b. 4 d. 9

Identify the true statement. Choose one: A. Underground coal mining is dangerous because of possible tunnel collapse and possible methane gas explosions. B.

On Earth, water exists as a. a solid. c. a gas. b. a liquid. d. All of the above.

What is true for ALL of the examples of electromagnetic waves? A. They all move at the same speed in a vacuum B. They all have the same wavelength C. They all have the same freqency D. They all have the same energy

An object of mass 0.40 kg, hanging from a spring with a spring constant of 8.0 N/m, is set into an up-and-down simple harmonic motion. What is the magnitude of the acceleration of the object when it is at its maximum displacement of 0.10 m?

Consider a helium balloon on a string tied to the seat of your stationary car. The windows are closed, so there is no air motion within the car. The car begins to accelerate forward. Which way will the balloon lean, forward or backward

The force of gravity acts upon meteors from the rocky asteroid belt between mars and Jupiter. Where is the force of gravity most likely to pull these meteors

Sally turns on her cellular telephone to speak to her friend who is located thousands of miles away. Which of the following best describes how such a telephone is able to transmit and receive information? A.

Calculate the gravitational potential energy relative to the ground when an 82 kg person climbs to the top of a 2.0 m stepladder.

A rock is thrown from a cliff and hits the ground five seconds later at a distance of 50 m from the cliff how high was a cliff