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Calculate the total resistance across AB; between A and B are two parallel branches, one branch with a 3 Ohm and a 5 Ohm resistor, the other branch with a 4 Ohm resistor.

1/Rt=1/R1+1/R2
R1=3+5=8
R2=4
Rt=1/(1/8+1/4)=8/3 Ohms = 2.67 Ohms (2 D.P.)

Answered by Peter A. • Physics tutor

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What do geostationary satellites do?

Geostationary satellites are objects (usually machines) that orbit the Earth at exactly the same velocity as the rotation of the Earth (strictly, the orbital period of the satellite is equal to the rotati...

Answered by Bill A. • Physics tutor

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A train is travelling at 50m/s. How long does it take the train to reach 60m/s if it accelerates at a constant rate of 0.5m/s^2? How many kilometres does it travel in this time?

The initial velocity, u, is 50 ms^-1 The final velocity, v, is 60 ms^-1 The acceleration, a, is 0.5ms^-2 The question is asking us to find the time, t. The equation of motion...

Answered by Elena S. • Physics tutor

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What does the half life of radioactive substance mean?

All radio active decay is random. In any radioactive substance each specific nucleus has a chance of decaying at one specific point in time. However we can't predict when this is going to happen. Instead...

Answered by • Physics tutor

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