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Define the term ultrasound wave

An ultrasound wave is a soundwave with a frequency higher than 20,000 Hz
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Answered by Reni A. • Physics tutor
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Insulating a home costs £2000 and saves £50 a year. What is the payback time?

40 years.
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Answered by Leo T. • Physics tutor
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Two railway trucks of masses m and 3m move towards each other in opposite directions with speeds 2v and v respectively. These trucks collide and stick together. What is the speed of the trucks after the collision?

In order to solve this question we need to use the principle of conservation of momentum which states: The momentum in a closed system remains constant before and after a collision or explosion. I.E. momentu...
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Answered by Sarah W. • Physics tutor
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Define the terms "acceleration" and "displacement". Explain simple harmonic motion with reference to both of these quantities.

Firstly, acceleration is the rate of change of velocity of an object, measured in ms -2 (read as metres per second squared, or metres per second per second). It can be either positive, indicating an increase...
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Answered by Hannah O. • Physics tutor
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A passenger is standing in a train. The train accelerates and the passenger falls backwards. Use Newton's first law of motion to explain why he fell backwards.

First we want to state what Newton's first law is. Newton's first law of motion states that an object at rest will remain at rest, or if in motion, will remain in motion at a constant velocity unless acted o...
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Answered by Alice J. • Physics tutor
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