Series/Parallel Circuits: A 4.0-? resistor is connected with a 12-? resistor and this combination is connected across an ideal dc power supply with V = 6.0 V, as shown in the figure. When a total current I flows from the power supply, what is the current through the 12-? resistor?
A. 1.5 A
B. 2.0 A
C. 2.5 A
D. 3.0 A
E. 0.50 A
Answer: E
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A pair of identical balls is connected by a massless rod, and thrown up into the air. The velocity of the center of mass is initially 17.2 m/s upward. 1.0 s later, one of the balls is measured to be at rest. What is the velocity of the other ball at this time? Ignore air resistance.
A. 14.8 m/s up B. 9.8 m/s down C. 7.4 m/s up D. 7.4 m/s down
Refer to the sketch above of an H-R diagram for a star cluster. Consider the star to which the arrow points. How is it currently generating energy?
A) by gravitational contraction B) by hydrogen shell burning around an inert helium core C) by core hydrogen fusion D) by core helium fusion combined with hydrogen shell burning E) by both hydrogen and helium shell burning around an inert carbon core
An electron inside a hydrogen atom is confined to within a space of 0.110 nm
What is the minimum uncertainty in the electron's velocity? ( h = 1.055 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 1.05 × 106 m/s B) 1.05 × 108 m/s C) 1.50 × 106 m/s D) 1.05 × 1010 m/s E) 1.50 × 108 m/s
When a molecule collides with another that is approaching with greater momentum, its rebound speed
1) stays the same, 2) increases, 3) decreases, and when a molecule collides with another that is receding, its rebound speed 4) stays the same. 5) increases. 6) decreases.