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Q. An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 443 Hz when the train is approaching him and 441 -Hz when the train is receding from him. Using these frequencies, he calculates the speed of train. What value does he find? m/s (suppose the speed of sound is 345 m/s.)
suppose that visible light enters a Plexiglas cube containing water at a 20o angle of incidence, travels through the water and exits the cube.
Two boats start together and race across a 64-km-wide lake and back. Boat A goes across at 64 km/h and returns at 64 km/h. Boat B goes across at 32 km/h, and its crew, realizing how far behind it is getting, returns at 96 km/h. Turnaround times ar..
A rifle with a barrel length of 56 fires an 8 bullet with a horizontal speed of 350. The bullet strikes a block of wood and penetrates to a depth of 14. (a) What resistive force (assumed to be constant) does the wood exert on the bullet? (b) How long..
A car is driven 175km west and then 55km southwest. What is the displacement of the car from the point of origin (magnitude and direction).
A stand, string, a paper or plastic cup, a nail, a roll of paper towels or similar sized paper, coloured sand, or some other dry powdery product, and a ruler or measuring tape.
A gymnast with mass m1 = 49 kg is on the balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 126 kg and length L = 5 m. Each support is 1/3 of the way from each end. Initially the gymnast stands at the left en..
The mousetrap car has a mass of 100 grams and starts travelling at the speed of 1.80 m/s and after 5seconds get the rested? What force did the motor exert.
Chromium is produced by reacting its oxide with aluminium. If 354 g of Cr2O3 and 158 g of Al react to form 204 g of Al2O3, how many grams of Cr are formed.
A submarine is 325 m horizontally out from the shore and 115 m beneath the surface of water. A laser beam is sent from the submarine so that it strikes the shore.
Two cars with equal mass collide head on. One car is going 18 mph. That car is push backward about 38 feet. What is the speed of other vehicle.
A standardized biological microscope has an 8.0--focal-length objective. What focal-length eyepiece should be used to achieve a total magnification of.
What is a stopping distance
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