The magnitude of the electric force between two protons is 2.30 × 10-26 N. How far apart are they?
1.0.100 m
2.0.0220 m
3.3.10 m
4.0.00570 m
5.0.480 m
1
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What field of science are the experiments on the two Mars Rovers Sojourner, Spirit, Opportunity and Curiosity most closely related to?
A) physics B) biology C) geology D) astronomy
A 120-V rms voltage at 60 Hz is applied across an RC circuit. The rms value of the current in the circuit is 0.60 A, and it leads the voltage by 60°. What is the resistance in this circuit?
A) 100 ? B) 60 ? C) 150 ? D) 200 ? E) 120 ?
One member of a pair of parallel conducting plates has potential 17 V. An electron is ejected from that plate at potential and travels the other plate, attaining a velocity of 
when it arrives. What is the potential of the second plate? The mass of the electron is 
kg.
A. 157 V B. 89 V C. 72 V D. -54 V E. 142 V
Equilibrium: A 15-kg child is sitting on a playground teeter-totter, 1.5 m from the pivot. What is the minimum distance, on the other side of the pivot, such that a 220-N force will make the child lift off the ground?
A. 1.0 m B. 1.5 m C. 0.10 m D. 9.8 m E. 2.4 m