A piece of magnetic material that retains its magnetic properties after it is removed from a magnetic field.

If an electrically neutral atom has 4 protons and 4 neutrons and it gains 2 neutrons what is its electrical charge

After the release of radioactive material into the atmosphere from a nuclear power plant in a country in 1986 , the hay in that country was contaminated by a radioactive isotope (half-life 6 days).

What is needed to support life

A voltage source of 10.0 V is connected to a series RC circuit where R = 2.80 x 100 2, and C = 3.50 uF. Find the amount of time required for the current in the circuit to decay to 4.00% of its original value.

The driver of a car slams on the brakes, causing the car to slow down at a rate of 26ft/s2 as the car skids 256ft to a stop. How long does the car take to stop? What was the car's initial speed? ft/s 4

People have proposed driving motors with the earth's magnetic field. This is possible in principle, but the small field means that unrealistically large currents are needed to produce noticeable torques.

A hot air ballon with a mass of 500kg ascends at a constant rate of 1.5 m/s for 20s. how much work is done by the upward force?

A construction team gives an estimate of three months to repave a large stretch of a very busy road. The government responds that it's too much inconvenience to have this busy road obstructed for three months, so the job must be completed in one

Determine the time needed for the load at b to attain a speed of 10 m/s, starting from rest.

A tea kettle is warmed on an electric stove. After a while, water vapor builds inside the kettle and causes a whistle in the lid to make a sound. How does this demonstrates the first law of thermodynamics?