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what force does a person have to exert on one side of a seesaw if the other person weighs 70kg and is the same distance away from the pivot (2m) on the other side of the seesaw?

70kg x 9.8 = 686N x 2 = 1372 Nm, as 2m away again, divide by 2 = 868 Newtons
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Answered by Marcus B. • Physics tutor
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Why does a change in depth in water give a far greater difference in pressure than the same change in height in air?

Begin by explain that pressure is described by the amount of force exerted on a given area (N/m 2 ). The force in this equation is given by the weight of everything directly above the point you are measuring...
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Answered by Murdo B. • Physics tutor
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What is the difference between a scalar and a vector?

In physics, a scalar is a quantity of a one value to describe the size of a physical property , such as energy or distance . A vector is a quantity of two values that describe the direction in which a physic...
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I throw a ball straight up with an initial velocity of 2m/s. How high is it after a fifth of a second?

assign each variable to a value in s = ut + 1/2at 2 u = 2m/s t=0.2sa=-9.81m/s 2 so s = (2 x 0.2) + 1/2(-9.81)(0.2) 2 so s =
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Answered by Henry A. • Physics tutor
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If a car sets off from rest with a constant acceleration of 3 m/(s^2), what would its speed be after 5 seconds?

Firstly we write down all known variables: Initial speed (u)=0 m/s, Acceleration (a)=3 m/s 2 , Time (t)=5s. Final velocity (v)=?Therefore, the equation chosen to solve the problem would be: v=u+at. Substitut...
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Answered by Shahnaan M. • Physics tutor
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