You use a lever to lift a heavy tree branch You apply a force of 100 N and the

lever lifts the branch with a force of 350 N What is the mechanical advantage

of the lever?

Fossils cannot be used to explain changes in the earth. True or false

When you throw a ball upward, its kinetic energy and its potential energy. When the ball reaches maximum height, its kinetic energy is at a.

A spaceship travels at 1,321 km/h. How many miles can it travel in 6.19 seconds?

Explain why atomic radius decreases as you move to the right across a period for main-group elements but not for transition elements. Match the words in the left column to the appropriate blanks in the sentences on the right.

Carl is eating lunch at his favorite cafe when his friend Isaac calls and says he wants to meet him. Isaac is calling from a city 155 miles away, and wants to meet Carl somewhere between the two locations.

A car's position in relation to time is plotted on the graph. What is the car's average velocity for segment C? A) - 4 m/s B) - 0.25 m/s C) 0.25 m/s D) 4 m/s

What percent of my Iodine-131 sample will be left after 7 half-lives?

A 58.0 kg snow skier is on the top of 351 m high hill. After she has gone down a vertical distance of 142 m, what is her mechanical energy? Explain your answer (CER) !

A sphere has a mass of 2.10kg and travels along a horizontal plane at the velocity of 12.2m/s. Find the energy

What is the force required to accelerate a baseball with a mass of 0.145 kilograms and an acceleration of 35.00 meters/second squared?