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An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 478 Hz when the train is approaching him and 468 Hz when the train is receding from him. Using these frequencies, he calculates the speed of the train. What value does he find?
m/s
A 255 kg piano slides 4.2 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40 Figure 6-36
Jim paddles a canoe across a river that is 20 meters wide in 2.0 minutes. Uopon reaching the other side, he realizes that the river carried him 12 meters east of his starting point. If the water flowed towards the east with consant velocity and his c..
A particle moves on the x axis under the influence of a force, proportional to its distance from the origin, attracting it toward the origin. The particle starts from rest at x = 10 cm and reaches x = 5 cm for the first time after 2 s. Find: a. the p..
A refrigerator has a surface area of 6.04 m2. It is lined with 0.0885-m-thick insulation whose thermal conductivity is 0.0300 J/(s m C °). How much heat per second is being removed from the unit
1ml of distilled water is injected into a length of 3mm diametre tubing and sealed at the other end by folding over, Why doesn't water drain out when the tube is hung vertically
A 2.10-cm-high insect is 1.50m from a 139-mm-focal-length lens. Where is the image? Follow the sign conventions, How high is the image
A car is traveling at 29m/s when the driver spots a large pothole in the road the distance 37 m ahead. She immediately applies her brakes. If her acceleration is -6.60m/s2, does she manage to stop before reaching pothole.
A golf ball of mass 0.050 Kg is hit off the tee at a speed of 35 m/s. The golf club was in contact with the ball for. Find the average force exerted on the ball by the golf club
a 2.0 kg object is dropped from a 4.0 meter height. Calculate the speed of the ball prior to striking the ground
The catapult on an aircraft carrier can take an aircraft from 0 to 85.6 m/s in 12.4 seconds, What is the acceleration of the aircraft when it launches
A placekicker must kick a football from a point 36.0 m (about 40 yards) from the goal. By how much does the ball clear or fall short of clearing the crossbar
You want to use a lens with a focal length of 37.0cm to produce a real image of an object, with the image twice as long as the object itself. Where should the object be placed
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