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What is the difference between speed and velocity?

Velocity is a vector quantity so takes both magnitude and direction into account. Speed is a scalar so only takes magnitude into account. They both have units of meters per second.
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Answered by Sebastian R. • Physics tutor
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An object orbits Earth at an altitude of 200 kilometers above the planet’s surface. What is its speed and orbital period?

To begin with, we need to draw a graph with all of the forces acting on a body. From that, we can see that the net force Fnet = Fg - Fc , where Fg is gravitational force and Fc is centripetal force acting on...
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Answered by Domas A. • Physics tutor
3797 Views

Describe the energy changes in the 4 stages of a bungee jump - at the top, in freefall, when the cord is stretching and at the bottom

There are 3 forms of energy during a bungee jump, kinetic (KE = 0.5mv^2), gravitational potential (GPE = mgh) and elastic potential (EPE = 0.5kx^2). Energy is conserved throughout, and it's assumed none is l...
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Answered by Felix E. • Physics tutor
39517 Views

With the help of a suitably labelled graph, explain what is meant by resonance of a mechanical system.

The resonance of a system occurs when the driving force is equal to the natural frequency. - This occurs at a certain specific frequency. - For example: someone being pushed on a swing. - (Diagram on whitebo...
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Answered by Henry E. • Physics tutor
3721 Views

Compare the medical uses of ultrasound and X-rays. Your answer should include the risks, if any, and precautions, if any, associated with the use of ultrasound and X-rays. [6 marks]

For six mark questions, it is important to remember that your quality of written communication will be assessed. This basically means that you're spelling, punctuation, use of terminology and how you form se...
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Answered by Nicholas M. • Physics tutor
16863 Views