A ramp is often used to raise an object. If 80 joules of energy are needed to lift an object to a platform but 100 joules are used in rolling the object up the ramp, what is the efficiency of the ramp?

two current carrying wires are placed next to each other. Their currents are moving in the same direction. Suggest why each wire experiences a force

Calculate the gravitational potential energy of a body of mass 40 kg at a vertical height of 10 m. (g = 9.8 m/s2)

In which situation is no work being done? a person carrying a box from one place to another a person picking up a box from the ground a person pushing a box from one place to another a person pulling a box from one place to another

a boat traveling at a speed of 1.63 m / s has a kinetic energy of 52000 J what is the mass of the boat

What evidence can you cite for the particle nature of light? 1. Refraction phenomenon of light 2. The many colors of light 3. Diffraction phenomenon of light

You pull on a wagon resting on the sidewalk. What will happen next. A. The wagon does not move because the wagon applies more force to you than you apply to the wagon. B. The wagon moves because you apply more friction to the ground. C.

If someone travels 3000 feet in one second, how far will it travel in 18 minutes

How long did it take to reload a rifle during the 18th 19 century?

Oil flows upward in the wick of a lantern because of the liquid property called A. meniscusity. B. capillarity. C. density. D. viscosity.

A high-mass star has more "fuel" than a low-mass star. which lives longer? why?