Help with my homework please! Show all work. Thanks! An asteroid of mass 58,000

Question

Help with my homework please!

Show all work. Thanks!

An asteroid of mass 58,000 kg carrying a negative charge of 15 mu C is 180 m from a second asteroid of mass 52,000 kg carrying a negative charge of 11 mu C. What is the magnitude of the net force the asteroids exert upon each other, assuming we can treat them as point particles? (k = 1/4 pi element_0 = 8.99 times 10^9 N middot m^2/C^2) A 25-m wire of diameter 0.30 mm draws 0.499 A when connected across a 3.0-V potential difference. What is the resistance of the wire? What is the resistivity of the material from which the wire is made?

Explanation / Answer

d = 0.3 mm, r= 0.15 mm, L = 25 m , V= 3 V, I = 0.499 A

(A) From ohms law V = IR

0.3 = 0.499*R

R = 0.6 ohms

(B) R = pL/A

0.6 = p*25/(3.14*(0.3*0.001)^2)

Resistivity p = 6.78*10^-9 ohm.m

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