What is electricity? Why does it happen?

A bicycle wheel is mounted on a fixed, frictionless axle, with a light string wound around its rim. The wheel has moment of inertia I=kmr2, where m is its mass, r is its radius, and k is a dimensionless constant between zero and one.

What is the momentum of a 100 kilogram boulder rolling south down a a hill at a velocity at 5 meters per second?

The energy of motion best describes which of the following? A) The energy of fusion B) The energy ofan electrical charge. C) Kinetic energy D) Potential energy

A 0.28 kg piece of glass is heated from 303 K to 333 K. How much heat had to be transferred to the glass? (specific heat to glass = 664 J/kg K)

Determine the mechanical energy of this object: a 1-kg pendulum has a speed of 2 m/s at a height of 1 meter. A. 9.8 J B. 11.8 J C. 2 J D. 7.8 J

If a force of 40 newtons moves a cart a distance of 9 meters, the work done is Nm. If the same force moves the same cart three times that distance, the work done is Nm. NextReset

What is the critical angle c for total internal reflection if the material is clear acrylic, with a refractive index of 1.5?

What is happening if energy input remains constant and voltage remains the same in a circuit, but the current decreases? A. The resistance has increased. B. The volts have decreased. C. The power has increased.

The velocity - time graph of a ball of mass 25g moving on road is as given below: (a) How much force does the road exert on the ball to bring it to rest? (b) What is the direction of the force exerted by the road?

A spring required a force of 5.0 n to compress it 0.1 m. How much work is required to stretch the spring 0.4 m?