A train travels 80 kilometers in 2 hours, and then 79 kilometers in 4 hours. What is its average speed?

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A car is going 7 m/s when it begins to accelerate. Sixty meters further down the road, the car is going 24 m/s. a) What was the acceleration of the car? b) How much time did the change from 7 m/s to 24 m/s take?

Air is a good conductor of heat ... True Or False!

A very long straight current-carrying wire produces a magnetic field of 25 µT at a distance d from the wire. How far will the magnetic field due to this wire be 2.8 µT.

The diagram shows the protons and neutrons in an atom. p = protons n = neutrons Which fundamental force is shown? O static o electromagnetic O strong O light p 7 na LA P n

3. A stone is thrown upward at an angle. What happens to the horizontal component of its velocity as it rises

An arc welder provides 250A of current when operating with a voltage of 40V. What is the power required by this welder? Explain your answer.

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a boy hears the echo of his own voice from a distance hill after 0.8 seconds. If the speed of sound in air is 340m/s, calculate the distance of the hill from the boy.

Which of the following are found in plant cells buh not animal cells?