What are the only elements that exist in nature as isolated atoms

Calculate the heat flux (in W/m2) through a sheet of a metal 11-mm thick if the temperatures at the two faces are 350 and 110 ˚C. Assume steady-state heat flow and that the thermal conductivity of this metal is 53.0 W/m-K.

Q - Explain the effect of Earth's gravity on objects on the surface of Earth. A - Gravity pulls objects toward Earth at a rate of 9.8 m/s2. Weight is the result of gravity's pull on a mass on Earth's surface.

A 120-g rubber ball is thrown with a speed of 10 m/s at an oncoming 900-kg car which is approaching at 30 m/s, and undergoes a one-dimensional elastic collision with the car.

The names of the seven days of the week are derived from the names of the bodies of the solar system that are visible to the naked eye.

When there are more coils added to the wire of an electromagnet what happens to the magnetic field? A) The magnetic field increases B) The magnetic field decreases C) The magnetic field varies D) The magnetic field stays the same.

A microwave oven operating at 120 volts is used to heat a sandwich if the oven draws 12.5 amperes of current for 45 seconds what is the power dissipated by the oven?

Which of the transformers are step-up transformers? Which of the transformers are step-down transformers?

1 A plane moving at 30m/s drops a load 200m down to the ground. How long did it take to hit the ground.

Can a body be in equilibrium if it is in motion? Explain

What is the average speed in kilometers per second of the earth around the sun?