A spring scale typically indicates the magnitude of the tension force exerted on its bottom hook. What will the scale read in each of the cases shown in the diagram?
A. 49 N
B. 98 N
C. 196 N
D. Other (specify)
B. 98 N
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A 150 W light bulb is operating on a 120 V rms ac line. What is the rms current in the bulb?
A. 2.50 A B. 1.67 A C. 1.50 A D. 1.25 A E. 0.883 A
A change in the direction of a wave when the wave finds an obstacle or an edge.
a) Refraction b) Standing wave c) Reflection d) Diffraction
Alice bungee-jumps from a bridge above a deep gorge. Bob watches from the bridge. Let event D be Alice’s departure from Bob’s location on the bridge, and event R be her return to Bob’s location on the bridge. Carol observes these events from a a train passing over the bridge, and uses synchronized clocks on the train to measure the time between Alice’s departure and return. Which person’s watch or clocks register(s) a proper time between events D and R?
A. Alice B. Bob C. Carol D. Alice and Bob E. Bob and Carol F. Alice and Carol T. All three observers
A galvanometer has a coil with a resistance of 24.0 ?. A current of 180 ?A causes full-scale deflection. If the galvanometer is to be used to construct an ammeter that deflects full scale for 10.0 A, what shunt resistor is required?
A) 123 ?? B) 234 ?? C) 342 ?? D) 432 ?? E) 423 ??