What three machines or devices depend of gravity to work?

1. Name several constellations that are visible every night here in Bellingham, WA during all 12 months of the year. Why are these constellations always visible whereas others are seasonal?

Which of the following is the best definition of an independent variable?

A train travels 79 kilometers in 2 hours, and then 77 kilometers in 3 hours. What is its average speed? Answers? and Units?

State the meaning of a battery

An electron in a 3d orbital could have which of the following quantum numbers?

How do whales bats and dolphins use echolocation? A To scare away predators B To attract mates C To orient them selves and find food D To tell animals of there species where they are

How much force would be needed to move a car with the mass of 100kg to an acceleration of 5m/s/s?

A pendulum bob is made from a sphere filled with water. What would happen to the frequency of vibration of this pendulum if the sphere had a hole in it that allowed the water to leak out slowly?

Elias serves a volleyball at a velocity of 16 m/s. The mass of the volleyball is 0.27 kg. What is the height of the volleyball above the gym floor when its total mechanical energy is 41.70 J? Round to the nearest number.

Which of the following is the best description of a graph? A. Equations that can be plotted B. A representation of an equation C. Independent and dependent variables D. x and y lines