Trevor lifts a 10kg box to the top of a cliff which is 20m high, in half an hour, then drops the box over the cliff. How much power did he use to lift the box?

Describe a simple experiment to show that sound cannot propagate through vacuum

The people in a location in Florida have reduced their water usage drastically since the last few months. People are taking shorter showers, turning off lawn sprinklers, and reusing water left over from cooking.

A student was heard saying "the mass of a ball on the moon is one sixth it's mass on earth"Give a reason why this statement is wrong?

What change in pressure occurs in a party balloon that is squeezed to one-half its volume with no change in temperature?

What is a positive impact of artificial fertilizers

A planet is discovered orbiting around a star in the galaxy Andromeda at four times the distance from the star as Earth is from the Sun.

Measurements of how orbital speeds depend on distance from the center of our galaxy tell us that stars in the outskirts of the galaxy. True or False

Identify what is required to calculate the atomic number and atomic mass of an element

What device is used to measure the current in a circuit

A lever allows a 35 N load to be lifted with a force of 7 N. What is the mechanical advantage of the lever?