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A commuter got on the train at the oakdale station at 6:50 a.m. She got off at metro station at 8:05 a.m. The train made five 3-minute stops along the way. Oakdale is 21 km from the end of the line, and metro station is 96 km from the end of the line.
A. What was the commuter's average speed getting to work?
B. What was the average speed of the train while it was under way?
As an energy-efficiency consultant, you're asked to assess the pumped-storage facility. Its reservoir sits 136 above its generating station and holds 9.0×10^9 of water. The power plant generates 315 of electric power while draining the reservoir over..
A child is pushing a merry-go-round. The angle through which the merry-go-round has turned varies with time according to ?(t)=?t+?t3, What is the initial value of the angular velocity
a heat engine takes in 150 kj of energy from a source at 740 k and expels 50 kj to a reservoir at 300 k. calculate the
What is the magnitude of the auto's average acceleration.
a carnot refrigerator is operated between two heat reservoirs at temperatures of 320 k and 265 k.if in each cycle the
To avoid hitting a pedestrian, a car driver slams on her brakes and comes to a complete stop after skidding 16 m. find the speed of the car when the brakes were applied
A particular guitar string is supposed to vibrate at 191- Hz, but it is measured to actually vibrate at 210- Hz. By what percent should the tension in string be changed to get the frequency to the correct value.
a 1 mW laser produces photons of wavelength 633 nm. How many photons per second does the laser emit
Two forces act on a 6.5 kg object sitting on friction-less horizontal surface and force is 25N in the(+) x-direction and the other is 35N in the (-)x-direction. What is the accelertation of the object
Long-playing vinyl records, still used by club DJs, are 12 inches in diameter and are played at 33 1/3 revolutions per minute. What is the speed (in m/s) of a point on the edge on such a record
two fire alarms are placed in a building one 3.1 m north of the other. a person sitting at a desk which is 51.2 m east
A 11.20 kg object oscillates at the end of a vertical spring that has a spring constant of 2.10 104 N/m. The effect of air resistance is represented by the damping coefficient b = 3 N•s/m.
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