Question

7. And 8. Please help, I would prefer someone to explain how to do it please

Answer 1

#7

Given that an electron revolves in a circle and the essential centripetal force is given as

`F = 4.60 * 10^(-14)N`

now we need to find its speed

so we know that this force is given as

`F = (mv^2)/(R)`

`4.60 * 10^(-14) = (9.11 * 10^(-31) v^2)/(2 * 10^(-2))`

`v^2 = 1.01 * 10^(15)`

`v = 3.18 * 10^7 m/s`

#8

Here the force due to earth on satellite is the centripetal force to revolve around earth

so we can say that force due to earth is given as

`F = (mv^2)/(R)`

we know that

`m = 2.7 * 10^3 kg`

`v = 4.7 * 10^3 m/s`

`R = 1.8 * 10^7 m`

now from above equation we have

`F = ((2.7 * 10^3)(4.7 * 10^3)^2)/(1.8 * 10^7)`

`F = 3313.5 N`