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What does a negative velocity mean?

To understand this question, it is important to know that velocity has both a direction and a magnitude. The magnitude can be expressed by the unit m/s, however the direction is expressed by a vector. ...

Answered by Thomas D. • Physics tutor

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A particle that moves uniformly in a circular path is accelerating yet moving at a constant speed. Explain this statement.

Acceleration is a change in velocity over time. Velocity is different to speed, because it has a direction (for example a car moving at 10 mph along a road heading north will have a greater ve...

Answered by Anna L. • Physics tutor

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A model truck A of mass 1.2 kg is travelling due west with a speed of 0.90 m/s . A second truck B of mass 4.0 kg is travelling due east towards A with a speed of 0.35 m/s .

a) Calculate the magnitude of the total momentum of the trucks.

The momentum (p) is the mass (m) of an object multiplied by its velocity (v).

p = m x v

Answered by Anna L. • Physics tutor

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What is meant by the binding energy of a nucleus?

The binding energy of a nucleus is the energy that would be required to split the nucleus into it's constituent nucleons.

Answered by Anuradha D. • Physics tutor

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What speed do satellites orbit at?

The key point to recognise here is that an object undergoing a circular orbit around the Earth is undergoing circular motion. Circular motion is caused by a centripetal force (acting towards the centre...

Answered by Ryan M. • Physics tutor

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