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Physics
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How does a hydraulic jack work and how do I work out the pressures involved?

(Draw hydraulic jack diagram using Pen tool) Firstly, we need the quation for pressure. Pressure is measured in Nm^2 which tells us that P=F/A. Where P is the pressure, F is the force in Newtons and A is ...

MZ
Answered by Max Z. Physics tutor
5544 Views

What is the difference between a vector and a scalar?

A vector is a measurement of something that has more than 1 number associated with it, for example velocity. I can tell you how fast a car is going using the magnitude of velocity, speed, and I can tell y...

MZ
Answered by Max Z. Physics tutor
4142 Views

Why is the car moving if the unbalanced force is zero?

This is a great example of where physics and our gut feelings about physics don't match up. This is a very common conceptional difficulty students have and is often jumped on by examiners. The best way to...

CD
Answered by Connor D. Physics tutor
17492 Views

An electric heater has a power of 1000W. It is connected to mains electricity (230V). The heater is equipped with an Earth wire. a) Calculate the current in the heater. b) Explain the role of the earth wire as a safety feature.

a) Use the equation P=IV where P is power in W, I is Current in Amps and V is voltage in volts. Rearrange to give I=P/V I=1000/230 = 4.34 A b) This is a wire connected to the metal casing of an electrical...

KS
Answered by Katie S. Physics tutor
14749 Views

How can we derive the 'suvat' equations of motion v=u+at and s=(u+v)t/2

  1. v=u+at Using a velocity time graph with constant acceleration, (graph provided as visual aid in tutorial) with initial velocity u and final velocity v, we can see that the graph is a straight line. ...
ID
Answered by Isobel D. Physics tutor
34161 Views

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