Kirchhoff's Rules: For the circuit shown in the figure, R1 = 50 ?, R2 = 20 ?, R3 = 35 ?, R4 = 10 ?, R5 = 68 ?, I1 = 0.111 A, I2 = 0.142 A, and the batteries are ideal.(a) Determine V1 and V2.(b) What is the potential difference across R4?
What will be an ideal response?
(a) V1 = 12 V, V2 = 15 V (b) 2.5 V
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If the mass of the Sun were cut in half, how would the force between the Sun and the Earth change?
a) it would quadruple b) it would double c) it would remain unchanged d) it would decrease by a factor of four e) it would decrease by a factor of two
When a switch is closed, completing an LR series circuit, the time needed for the current to reach three-quarters its maximum value is ____ time constants.
A. 0.500 B. 0.693 C. 0.725 D. 1.33 E. 1.39
Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degrees incline. The inclined surface has a coefficient of kinetic friction of 0.200. The vertically hanging mass is 6.00 kg and the mass on the incline is 4.00 kg. The acceleration of the 4.00 kg mass is (the initial velocity is zero)
A. 7.16 
B. 5.84
C. 2.98
D. 1.53
E. 0.00
An artificial satellite in a low orbit circles the earth every 98.0 minutes. What is its angular speed in rad/s?
What will be an ideal response?