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


D. Alice and Bob

Physics & Space Science

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Series/Parallel Circuits: Four resistors are connected across an ideal dc battery with voltage V, as shown in the figure. If the total current in this circuit is I = 1 A, what is the value of the voltage V?

A. 2 V B. 4 V C. 6 V D. 8 V E. 10 V

Physics & Space Science

A straight wire is bent into the shape shown. Determine the net magnetic force on the wire.

A. Zero B. IBL in the +z direction C. IBL in the ?z direction D. 1.7 IBL in the +z direction E. 1.4 IBL in the ?z direction

Physics & Space Science

A mass is oscillating on a spring with an amplitude of 8.3 cm and a period of 4.6 s. Write an expression for its position, x, as a function of time, if x is equal to 8.3 cm at t = 0 s

What will be an ideal response?

Physics & Space Science

The sharply defined boundary that separates the crust from the mantle is called the ______________

Fill in the blank(s) with correct word

Physics & Space Science