A swimmer swims 40 miles in 80 seconds. What is the swimmer's average speed?

Jawless fish and ocean reefs were devastated by which extinction? Late Devonian Ordovician-Silurian Permian-Triassic End Triassic Cretaceous-Tertiary

When an object is getting closer to us, it emits redder light. True or False

A runner makes one lap around a 200m track of a time of 25s. What were the runner's (a) average speed

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Which type of stress force produces normal faults?

Two iron rods are placed horizontally, touching end-to-end. One end of one rod is heated. After some time, the other rod also feels warm to touch.

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