Planet Z has diameter 1.8 * 107 m. On the planet's surface, the acceleration due to gravity is 19.5 m/s2. What is the mass of the planet? Note: The constant of universal gravity (G) equals 6.674 * 10-11 N ⋅ m2/kg2.

What effect does Earth's spherical shape have on the amount of sunlight that reaches the equator?

Niagara Falls is a set of very large waterfalls located on the border between New York and Ontario, Canada. Over 200,000 cubic feet of fast-moving water falls approximately 180 feet every second.

What is an example of situational irony in the excerpt?

A fish (6 kg) is being yanked vertically upward out of the water and the fishing line breaks. If the line is rated to a maximum tension of 150 N (~ 33 lb test), then what was the minimum acceleration of the fish (in m/s2) ?

a footballer took a penalty kick and ball moved with a velocity of 4mls, calculate the work done by the footballer if the mass of the ball was 40g

Which best describes why a physical change differs from a chemical change? A. A physical change predicts the behavior of a substance when in a reaction, whereas a chemical change is used to identify characteristics of a substance. B.

You are watching children play a game of tug-o-war with an old plastic clothesline. The two teams are pulling at opposite ends of the cord and each team is trying to drag the other team into a mud puddle that lies between them.

What is the rate at which electrical energy is converted to another form of energy called?

A person gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. The cart travels forward along the floor, gradually slowing as it moves.

A driver, traveling at 22.0 m/s, slows down her 2.00 x 103 kg car to stop for a red light. What work is done by the friction force against the wheels?