If a lever system has an output force (load) of 20 kg and an input force (Effort) of 100 kg, the mechanical advantage of this lever is:

A. 2000

B. 0.2

C. 0.5

D. 5

The relationship between observation and hypotheses

An electron travels 1.92 m in 4.47 * 10-8 s. How fast is it traveling? Answer in units of m/s.

What is 4/3:1/6 explain or show you reasoning

State the name of the process in each of the following changes of state: a) Solid to a liquid b) Liquid to a solid c) Gas to a liquid d) Liquid to a gas

How does an object move when it is subject to a steady centripetal force? How does it move if that force suddenly disappears?

A roller coaster has a mass of 500 kg. It drops from rest at the top of a hill that's 57 m tall. How fast is it going when it reaches the bottom? Acceleration due to gravity is g = 9.8 m/s2.

Two sinusoidal waves are moving through a medium in the positive x-direction, both having amplitudes of 7.00 cm, a wave number of k=3.00m-1, an angular frequency of ω=2.50s-1, and a period of 6.00 s, but one has a phase shift of an angle ϕ=π12rad.

For a vacation, you and your family fly east to west from Boston, Massachusetts, to Seattle, Washington. You notice that your flight back home to Boston is shorter than your flight to Seattle. Which phenomenon causes your flight home to be shorter?

You spy on an anchor on the bottom of a lake. What is the direction and amount of force the water exerts on it: a) zero b) up, equal to the weight of the anchor. c) up, less than the weight of the anchor d) down, equal to the weight of the anchor.

How are electromagnetic waves different from matter waves?