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When a 470 micro farad capacitor is discharged through a fixed resistor R, the pd across it decreases by 80% in 45 s. Calculate the time constant of the circuit

Using the equation V=V0e-t/RC where RC is the time constant to be calculated: We know that the pd decreases by 80%, therefore the pd remaining, V is 0.2*V0. Putting this i...

PK
Answered by Peter K. • Physics tutor
12871 Views

The first term of an arithmetic series is a and the common difference is d. The 12th term is 66.5 and the 19th term is 98. Write down two equations in a and d then solve these simultaneous equations to find a and d.

The first step is to recall the formula for arithmetic progressions: u(n) = a + (n-1)d We can then put all the information given in the question into this so u(12) = 66.5 = a + 11d and u(19) = 98 = a ...

EW
Answered by Eleanor W. • Maths tutor
7064 Views

A curve has equation (x+y)^2=x*y^2, find the gradient of the curve at a point where x=1

  1. Differentiating left hand side: 2(x+y)(1+dy/dx) from the chain rule 2. Differentiating right hand side: y2+2xy(dy/dx) from the product rule 3. Equating sides and taking out factors of dy/...
PK
Answered by Peter K. • Maths tutor
4054 Views

How do I write an Oxbridge personal statement?

For this I would advise three key points.

(1) Remember you're applying to study a subject not, for a career. At Oxbridge there is a special emphasis on this and the people r...

SP
1790 Views

Describe how crude oil is separated by fractional distillation.

Crude oil is composed of hydrocarbons of different lengths. In a fractional distillation chamber, the crude oil is heated and cooled to different temperatures. The shorter chain hydrocarbons will boil at ...

SP
Answered by Sophie P. • Chemistry tutor
12498 Views

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