Radio waves have ________ wavelength and ________ frequency relative to visible light.
A. shorter; larger
B. longer; smaller
C. longer; larger
D. shorter; smaller
Answer: B
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A motorboat that normally travels at 8 km/h in still water heads directly across a 6-km/h flowing river. The resulting speed of the boat is about
A) 6 km/h. B) 8 km/h. C) 10 km/h. D) 20 km/h.
Two resistors having resistances of 5.0 ? and 9.0 ? are connected in parallel. A 4.0-? resistor is then connected in series with the parallel combination. An ideal 6.0-V battery is then connected across the series-parallel combination
What is the current through the 9.0-? resistor? A) 0.35 A B) 0.53 A C) 0.83 A D) 0.30 A E) 0.67 A
Friction: The figure shows a system consisting of three blocks, a light frictionless pulley, and light connecting ropes that act horizontally on the upper two blocks. The 9.0-kg block is on a perfectly smooth horizontal table. The surfaces of the 12-kg block are rough, with µk = 0.30 between the 12-kg and 9.0-kg blocks. The mass M of the hanging block is set so that it descends at a constant velocity of 3.25 m/s.(a) What is the mass M of the hanging block?(b) The mass M is now changed to 5.0 kg, causing it to accelerate downward after it is released. What is the acceleration of the hanging mass?
What will be an ideal response?
Waves arriving at a free boundary are
a. neither reflected nor inverted. b. reflected but not inverted. c. reflected and inverted. d. inverted but not reflected.