A rope and pulley system is used to lift a box that weighs 90 Newton's. How much force do you need to pull on the rope if the machine has a mechanical advantage of 5?

A steel sphere sits on top of an aluminum ring. The steel sphere (a = 1.1 x 10^-5/degrees celsius) has a diameter of 4.000 cm at 0 degrees celsius. The aluminum ring (a = 2.4 x 10^-5/degrees celsius) has an inside diamter of 3.

How can weathering and erosion be a problem?

A level pipe contains a nonviscous, incompressible fluid with a density 1200 kg/m3 that is flowing steadily. At one position within the pipe, the pressure is 300 kPa and the speed of the flow is 20.0 m/s. At another position, the pressure is 200 kPa.

Kaitlyn builds a project in which light bulb A and light bulb B are in parallel circuits. The project has a switch and uses a battery for its source of voltage. She connects her battery and neither light turns on.

How is periodicity of properties dependent upon number of protons in an atom?

Why do marine west coast climates have much precipitation

Wright true or false: 1. A baseball has more momentum than a tennis ball traveling at the same speed. 2. A light ball has more inertia than a heavy ball 3. The less momentum a bowling ball has, the easier it is for that ball to knock down pins. 4.

The interference of two sound waves of slightly different frequencies produces

8. A force of 80 pounds on a rope is used to pull a box up a ramp inclined at 100 from the horizontal. The rope forms an angle of 330 with the horizontal. How much work is done pulling the box 25 feet along the ramp?

A raindrop has a mass of 5.4 * 10-7 kg and is falling near the surface of the earth. Calculate the magnitude of the gravitational force exerted (a) on the raindrop by the earth and (b) on the earth by the raindrop.