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If a 60kg girl jumps out of a helicoptor, draw diagrams to show the forces (with values) acting on her when a) she is in freefall, b) she is accelerating at half of g (g = 10 m/s^2), c) she is travelling at a constant speed?

a) 600N arrow down for weight, no air resistance arrow, acceleration = 10m/s^2

b) 600N arrow down, 300N arrow up for air resistance, acceleration = 5m/s^2 (Using F = ma)

c) 600N arrows up...

Answered by Ella J. • Physics tutor

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Explain, in terms of pressure, how straws draw water into your mouth.

Atmospheric pressure is an expression for the force exerted on a surface (in this case the water surface) per unit area caused by air particle collisions on the surface. In a cup of water, there is a unif...

Answered by Benjamin S. • Physics tutor

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Why can heat only be transferred through a vacuum by radiation, and not conduction or convection? (3)

Heat transfer by conduction and convection works by particles colliding and transferring energy, as there are no particles in a vacuum heat transfer can only occur by radiation. This is because radiati...

Answered by James W. • Physics tutor

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