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Do heavy things fall faster than small things?

In a vacuum (ie in the absence of air resistance) all things fall with exactly the same acceleration. The reason for this can be easily seen. An object, with mass ‘m’, falling in a gravitational field in a v...
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Answered by Angus D. • Physics tutor
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What is the Doppler effect and how is it exploited in everyday life?

The Doppler effect describes the changes in a wave's frequency (or wavelength) as the source of the wave moves towards/ away from the observer (you). You have almost definitely experienced this phenomenon be...
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Answered by Abin V. • Physics tutor
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What is the difference between a longitudinal and a transverse wave?

First it's important to remember that a wave isn't an object that is moving. When a wave moves through a substance the particles of the substance move side to side or backwards and forwards around their orig...
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Answered by Maya B. • Physics tutor
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A crane is attached to one end of a steel girder, and lifts that end into the air. When the cable attached to the end of the girder is at 20 degrees to the vertical, the tension is 6.5kN. Calculate the horizontal and vertical components of this force.

6.1kN vertically up 2.2kN horizontally to the right
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Answered by Alex R. • Physics tutor
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What is the difference between a Scalar and a Vector?

A vector is any physical quantity which has a direction and a magnitude, whereas a scalar is a physical quantity that is not directional (magnitude only).
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Answered by Alex R. • Physics tutor
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