Relative Velocity: A boat, whose speed in still water is 8.0 m/s, crosses a river with a current of 6.0 m/s. If the boat heads perpendicular to the current, what is the speed of the boat relative to an observer standing on the shore as it crosses the river?
A. 5.3 m/s
B. 6.0 m/s
C. 8.0 m/s
D. 10.0 m/s
Answer: D
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Single-Slit Diffraction: A single slit, which is 0.0500 mm wide, is illuminated by light of 550 nm wavelength. What is the angular separation between the first two minima on either side of the central maximum?
Fill in the blank(s) with the appropriate word(s).
RLC Circuits: A 120-V rms signal at 60 Hz is applied across a series combination of a 30-mH inductor and a 100-? resistor. What is the rms value of the voltage across the resistor?
A. 120 V B. 60 V C. 100 V D. 150 V E. 0.70 V
You ride a motor scooter 8 km in 10 minutes. Your speed is
A) 24 km/hr. B) 40 km/hr. C) 16 km/hr. D) 32 km/hr. E) None of the above.
A 1200-kg automobile moving at 25 m/s has the brakes applied with a deceleration of 5.0 m/s2 . How far does the car travel before it stops?
a. 39 m c. 55 m b. 31 m d. 63 m