Question

Show all your steps.
A)What is the equivalent resistance of four 20 Ω resistors connected in parallel?
B) A cyclist starts to pedal vigorously, increasing her velocity from 6.0m/s [E] to 14.0m/s [E] in 6.0s. The total mass of the cyclist and bicycle is 58kg. Find the net force acting on the cyclist and bicycle?
C) Calculate the amount of current through a wire that has 0.85C of electrons passing a point in 2.5min?

Answer 1

Explanation:

1. No of 20 ohm resistor = 4

Rp = 4/(1+1+1+1) = 4/4 = 1 ohm

Ans) The equivalent resistance is 1 ohm

2. u = 6m/s v= 14 m/s t= 6s

v = u+at => 14-6/6 = a => 8/6 = a => a = 4/3 = 1.33 m/s^2

Force = 58*1.33 N = 77 . 14N

3. Time = 2.5 s

Charge = 0.85C

Current = 0.85/(2.5X60) = 0.0056A