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Draw a graph depicting a skydivers speed against time when jumping from a plane, until he deploys his parachute, explaining the logic of your answer through the forces applicable to the body.

Upon jumping from the plane, the diver experiences three forces; a downward force from his weight; opposed by a lift force (equal to the weight of the air he displaces); and an upward drag force = ½ . (C<...

Answered by Bronagh R. Physics tutor
1469 Views

Derive an expression for wave speed in terms of wavelength and frequency.

The general expression for speed is speed=distance/time.The wavelength (lambda) of a wave is the distance between one point on an oscillation to the exact same point on the next oscillation, or more simpl...

Answered by Muhammed R. Physics tutor
4667 Views

What is the difference between alpha and gamma radiation?

Alpha radiation is a type of radiaiton which has a high ionisation and low penetration. This means it can ionise objects very easily (so can be more damaging to humans) but it can only travel a very short...

Answered by Austin D. Physics tutor
1352 Views

How do I derive Kepler's 3rd law using Newton's Law of gravitation, in the case of a circular orbit?

Kepler's 3rd law states that the cube of the radius, r from a planet is directly proportional to the square of the orbital period around it, T: r3 ∝ T2 (this is the result we want!)<...

Answered by Greta C. Physics tutor
4589 Views

When going around a roundabout, why do I feel a force pulling me outwards?

The force pulling you outwards is what is called fictional force. Actually, there is a force pulling the car inwards and since Newton's Laws mean that you want to keep moving forwards rather than going ar...

Answered by Jasmine C. Physics tutor
5307 Views

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