eeberited an Meld from rest to 1.0 km/bee. Approximately what polestial dinerewe

Question

eeberited an Meld from rest to 1.0 km/bee. Approximately what polestial dinerewee was required to reach this speed? e, 55 7. What is the potential dimerenee across a 50 mFeapaeitor earrying a charge of 2.5 mV c, 4.0 V d, 400 V e, 4.0 kV What is the net charge on 2.0 MF eapacitor attached if the total stored electrical energ is 200 J? a, 55 C b, 4.00 MC e, 28 mC d. 18 C e. 5.0 C 9. A 150 nF parallel plate capacitor consists of two identical square plates that are kept separated by a layer of teflon which keeps the plates 0.05 mm apart. A side length of each plate is about b, 12 cm 64 cm 10. The resistance of a 100-km long copper wire with radius of cm at 20 C approvimately h. .215 220 d. 450 e, 2.0 kn

Explanation / Answer

7)

here by using the formula

Q = C * V

V = Q / C

V = 20 / (50 * 10^-3)

V = 400 volts

the correct option is D

8)

here

U = 0.5 * Q^2 / C

200 = 0.5 * Q^2 / (2 * 10^-6)

Q = 0.028 C

Q = 28 mC

the correct answer is C

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