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Explain, using appropriate laws of motion, why the air exerts a force on the engine in the forward direction.

This question is taken from AQA 2016 question 1 part 2, http://filestore.aqa.org.uk/sample-papers-and-mark-schemes/2016/june/AQA-74071-QP-JUN16.PDF The force is acting on the air by the engine. By Newton's 2...
WL
Answered by William L. • Physics tutor
7306 Views

What do you understand by simple harmonic motion?

Is the motion of a mass on a spring when it is subject to the linear elastic restoring force given by Hooke's Law. The motion is sinusoidal in time and demonstrates a single resonant frequency. There are dif...
AT
Answered by Aitor T. • Physics tutor
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Two balls with the same kinetic energy have mass of ball a = m and ball b = 2m. What is the ratio of their momentums: a/b?

We know that both balls have the same kinetic energy, so we can write E ka = E kb We also know that kinetic energy is given by the equation E k = 1/2 (mv 2 ) and momentum, p, is p = mv where m is the mass an...
ZR
Answered by Zachary R. • Physics tutor
7686 Views

How do I calculate the hydrostatic pressure?

Hydrostatic pressure originates from the weight of the liquid. At a certain point in the liquid, the hydrostatic pressure is going to be equal to the weight of the liquid above the examined point. So in orde...
BG
Answered by Barnabas G. • Physics tutor
5892 Views

In some SUVAT questions, they ask for 2 time solutions and I can only find 1. What am I missing?

Let's say we are trying to work out how long it will take for a ball to be caught after it has been thrown straight upwards. If we set the final displacement to be zero (S=0) and solve S=UT+0.5AT 2 , it appe...
CI
3761 Views