The Sun is about 150 million km from earth. how long does it take light from the sun to reach earth? (Speed of light is 3x10^8m/s)

Use the component form of newton's second law to write an expression for the x component of the net force, σfx

A decrease of one unit on the pH scale means a solution is ten times more acidic. A decrease of two units means the solution is 100 times more acidic. How much more acidic is acid precipitation (pH = 4.0) than pure water (pH = 7.0) ?

A soccer ball is kicked horizontally off a bridge with a heigh of 36m. The ball travels 25m horizontally before it hits the pavement below. What was the soccer ball's speed when it was first kicked?

20. The model of the universe that suggests that the sun is the center of the universe was first brought by A. Copernicus. B. Brahe. C. Ptolemy. D. Kepler.

If a hockey stick exerts a force of 40 N on a 0.5-kg puck, what will the resulting acceleration be? O A. 20 m/s2 OB. 80 m/s2 O C. 9.8 m/s2 O D ... 0125 m/s2

A car travels 35.0 mph north for 1.00 hour, then 40.0 mph east for 0.0500 hour, and finally 50.0 mph northeast for 2.00 hours. Calculate the average speed.

A 500 lb steel beam is lifted up by a crane to a height of 100 ft and is held there. A) How much work is being done to hold the beam in place? B) How much work was done to lift the beam?

If Light is shone through the slits of a card onto a sheet of white paper describe what is seen.

When you break a magnet in half, how many poles does each piece have? Explain.

What can you use to unscrew a tiny screw?