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Physics
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Describe the forces acting on an object on earth falling through the air, and how they change from when the object is first released into the air leading to terminal velocity.

The two forces acting on the object are weight due to gravity pulling the object towards earth, and drag resisting this motion. When the object is first released, drag is small as velocity is low, so the ...

Answered by Julia E. • Physics tutor
29453 Views

How do I find an area in m^2 when I'm given lengths in cm?

its tempting when we're given a length in cm - let's use a radius for example - to simply square the number of cm. However this can lead you into traps. Take a circle with radius 5cm. We know that A=pi

Answered by Lauren M. • Physics tutor
1975 Views

A ball is hit horizontally at a height of 1.2 m and travels a horizontal distance of 5.0 m before reaching the ground. The ball is at rest when hit. Calculate the initial horizontal velocity given to the ball when it was hit.

Vertically: u=0 ms-1  s=1.2 m  a=9.8 ms-2 s=ut + 0.5at2 Therefore t = 0.49s Horizontally: t=0.49s  s=5.0m speed = distance/time = 5.0/0.49 = 10.2 ...

Answered by William W. • Physics tutor
2595 Views

What is the life cycle of a star?

Star formation begins when dust and gas starts to gather to form a cloud called nebula. Gravity causes the cloud to spiral and form a Protostar, where gravity accelerates...

Answered by Barbara P. • Physics tutor
2713 Views

If photons are little particles emitted by atoms, where were they before they got emitted?

Eisntein showed that in his theory of relativity that energy and mass were no longer conserved, as they are in Newton's theory. This completely changes how we see particles. They are no longer fundamental...

Answered by Uther S. • Physics tutor
1739 Views

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