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Resistors of 5 ohms and 10 ohms are connected in series with a battery supplying 3 volts. What is the total resistance ? And calculate the current in the circuit.

For the first part of the question we note that the resistors are in series, this means we can simply add together the resistance, giving a value of: 15 ohms For the second part we use the equation V=IR, sub...
AN
Answered by Alexander N. • Physics tutor
20240 Views

On a see-saw Mary, weight 600N balances John, weight 200N when she sits 1.5m away from the pivot. How far from the pivot is John?

Using the knowledge that the moments are balanced, we can create an equation to calculate the distance John is from the pivot: 600N 1.50m = 200N (distance) (600/200)*1.5 = distance distance = 4.5m
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Answered by Alexander N. • Physics tutor
12907 Views

The loudspeaker produces a sound wave with a frequency of 850 hertz and a wavelength of 0.4 metres. Calculate the speed of this sound wave. Give the unit

The speed of a wave is given by "Frequency*Wavelength=Wave speed". Hence, the speed is 340. With the units of speed being m/s
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Answered by Alexander N. • Physics tutor
10608 Views

How do I write a good introduction to an essay?

The introduction to your English essay is all about opening up, clearing up and getting your readers prepared for the nature of your answer. In other words, the introduction should warm your reader up to the...
MF
6154 Views

How do you differentiate y = 5 x^3 + 1/2 x^2 + 3x -4

FIrslty to avoid confusion: x = the variable x X = multiplication. When you differentiate an equation, the derivative (answer) is referred to as dy/dx. For a polynomial as in this question you take each term...
EM
Answered by Emma M. • Maths tutor
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