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Physics help

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astarmathsandphysics:
Circumference of the rind is pi*d. see the diagram.

Saladin:
Thanx a lot astar, the illustration really helped.

astarmathsandphysics:
Io is one of Jupiter’s moons. Some of the electrons released from the volcanic surface of
Io have an average velocity of 2.9 × 107 m s–1 towards Jupiter. The distance between
Jupiter and Io is 4.2 × 105 km.

(b) In this way a current of 3.0 × 106 A is created between Io and Jupiter. Calculate the
     number of electrons that arrive at Jupiter every second.
It will be I/e=3*10^6/1.6*10^-19=1.875*10^25

Saladin:
here it is

15 b

astarmathsandphysics:
The voltage across the 5ohm resitor, v=IR=0.6*5=3ohms so the voltage across the 30 ohm resistor and R is 9-3=6V for both since they are in parallel.
Use V=IR for the30 ohm resitor
V=IR
6=I*30 so I =6/30=0.2A

Thethe other 0.6-0.2=0.4A goes through R so I2=0.4A

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