A machine that promises more energy output than input is?

Two charged particles are placed 2.0 meters apart. the first charge is + 2.0 e-6 c and the second charge is + 4.0 e-6 c. what is the electrical force between the two charges?

Coin-shaped compartment that contains light-absorbing molecules

A farmer is using a rope and pulley to lift a bucket of water from the bottom of a well. the farmer uses a force f1=57.5 n to pull the bucket of water upwards. the total mass of the bucket of water is f2 = 3.9kg.

What is the radius of a sphere that has a volume of 36 mm3?

Nydia noted all the information below. Which statement gives quantitative data? Some of the growth rings are wider than others. The tree was 20 years old when it was cut down. A forest fire burned the tree during the years that it was alive.

A 2.0-kilogram laboratory cart is sliding across a horizontal frictionless surface at a constant velocity of 4.0 meters per second east. What will be the cart's velocity after a 6.0-newton westward force acts on it for 2.

A boat floats with 25% of its volume under water. a. What is the boatâs density? b. If the boat was made from 500 kg of metal, what is the volume of the boat? (Assume the air in the boat has negligible mass and density) c.

Why does each mineral have their own property, different from every other mineral?

Earth's tallest mountain ranges are found at plate boundaries

Is a lung a living organism, why or why not?