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Ann and Bob play on a uniform seesaw. The seesaw is 4m long and Ann and Bob weigh 600N and 800N respectively. If both Ann and Bob start at one end of the seesaw and Bob starts to walk up the seesaw at 2m/s, after how long will the seesaw turn?

(expect a diagram of a uniform seesaw with a pivot in the middle, infered from the question) For the seesaw to turn, Bob must create a greater Moment than Ann. Moment = Force * Perpedicular distance to pivot...
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Answered by Angus S. • Physics tutor
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Draw diagrams to represent the particles in each state: solid, liquid, and gas.

The box for the solid should be an orderly set of circles with no gap between each one. The box for the liquid represents molecules with more energy but not all bonds have been broken. Therefore the box shou...
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Answered by Alex V. • Physics tutor
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What is Kirchoff's first law?

The sum of multiple currents going into a junction equals the sum of the currents leaving it. I1 + I2 = I3
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Answered by Lydia W. • Physics tutor
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What is the conservation of energy?

Energy comes in many forms (e.g. chemical, potential, kinetic). We say that energy is transferred when it changes from one form to another. The conservation of energy means that in a closed system the amount...
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Answered by Augustina B. • Physics tutor
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Use the kinetic theory of gases to explain why the pressure inside a container increases when the temperature of the air inside it rises. Assume that the volume of the container remains constant.

The kinetic theory of gases states that a gas consists of many molecules in constant motion. A rise in temperature increases the mean speed of these molecules, and therefore their momentum (=mv). The increas...
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Answered by Epen T. • Physics tutor
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