A singer moves a note down one octave ... How has the sound changed?

What is the molecular mass of magnesium chloride, MgCl2? (how do you get to the answer as well)

Lunar missions have revealed that the moon has:

What time does the full moon rise? A. About Sunrise B. About Noon C. About Sunset D. About Midnight

If your town issued an emergency flood warning, what steps would you take?

Rust formation is represented as iron + oxygen rust + energy. Which describes this reaction?

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