What is the sun

a big ball of gas

What arel different types of electricity?

Which type of plate boundary is most closely associated with the formation of new ocean floor?

A skier is skiing down a slope on the mountain. Is the mechanical energy conserved? Why or why not? The mechanical energy isn't conserved. Some energy is lost to gravity. The mechanical energy isn't conserved. Some energy is lost to friction.

Two gears are connected. Gear A has 10 teeth, while gear b has 40 teeth. If gear B turns at 10 rpms, how fast will gear a turn?

A water-balloon launcher with mass 2 kg fires a 0.75 kg balloon with a velocity of 14 m/s to the west. What is the recoil velocity of the launcher?

Which part of the motor is responsible for reversing the flow of current?

In a generator, as the magnet spins, opposite poles of the magnet push the electrons in opposite directions. This back-and-forth movement of electrons is called what? A) revolutions per minute B) direct current C) alternating current.

A train travels at a speed of 30 miles/hour and traveled a distance of 240 miles. How long did it take the train to complete its journey?

What is the mass number of a potassium atom that has 20 neutrons

If an atom has a mass number of 23, which of the following is always true? The number of protons in the nucleus does not equal the number of neutrons. The atomic number is less than 11. The atom is not an isotope.