A 30-kg child sitting 5.0 m from the center of a merry-go-round has a constant speed of 5.0 m/s. While she remains seated in the same spot and travels in a circle, the work the seat performs on her in one complete rotation is
a. 0 J.
b. 150 J.
c. 1 500 J.
d. 4 700 J.
e. 46 000 J.
a
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An airplane has a mass of 8,000 kg and is flying at 150 m/s in level flight. The airplane drops 1,000 kg of water on a fire below. The velocity of the airplane after dropping the water is
A. 50 m/s. B. 60 m/s. C. 75 m/s. D. 100 m/s. E. 150 m/s.
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
A 200-W light bulb is connected across a 110-V dc power supply. What is the current through this bulb?
A) 0.90 A B) 0.36 A C) 0 A D) 0.60 A E) 1.8 A
A truck moves 80.0 m east, then moves 140.0 m west, and finally moves east again a distance of 80.0 m. If east is chosen as the positive direction, what is the truck's resultant displacement?
a. 20.0 m b. –20.0 m c. 300.0 m d. –300.0 m e. 140.0 m