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Q. A 13g bullet traveling 223m/s penetrates a 2kg block of wood and emerges cleanly at 160 m/s. If the block is stationary on the frictionless surface when hit, how fast (m/s) does it move after the bullet emerges?
Q. Two speakers, one straight behind the other, are each generating a 210 Hz sound wave. What is the smallest separation distance between speakers that will produce destructive interference at the listener standing in front of them? The speed of sound is 348m/s.
Jane and John, with masses of 51 kg and 66 kg, correspondingly, stand on a frictionless surface 13m apart. John pulls on a rope that connects him to Jane, giving Jane an acceleration of 0.9m/s2 toward him.
An oscillator with a mass of 420 g and a period of 0.900 s has an amplitude that decreases by 1.90 percent during each complete oscillation.
A 6 kg block slides along a frictionless horizontal surface. The block is acted on by two forces, a 4.5 N force to the left, and a 7.5 N force to the right. At what rate is the 4.5 N force doing work on the block at the instant when its speed is 4..
A thunderstorm drops 6.0cm of rain on a city that covers an area of 33 km by 45 km. approximation the number of raindrops that fell during the storm. You could assume the diameter of a raindrop is 2 mm.
A major-league pitcher can throw a baseball in excess of 41.9 m/s. If a ball is thrown horizontally at this speed, how much will it drop by the time it reaches the catcher who is 18 m away from the point of release.
An electric field of 7.90 x10^5 V/m is desired between two parallel plates, each of area 41 cm2 and separated by 2.45 mm of air. What charge should be on each plate.
Starting from rest, a 98 kg firefighter slides down a fire pole. The average frictional force exerted on him by the pole has a magnitude of 800N, and his speed at the bottom of the pole is 3.2 m/s. How far did he slide down the pole.
assume a bar 2.5 m long expands 0.5 cm when heated. By how much will a bar 100 m long of the same material expand when similarly heated.
An atomic nucleus of mass 288 u moving at 405m/s emits an alpha particle of mass 4.0 u in the direction of its velocity. If the remaining nucleus slows to 360m/s, what velocity does the alpha particle have when it is emitted.
A 50.0 g silver spoon at 20.0 C is placed in a cup of coffee at 90.0 C. How much heat does the spoon absorb from the coffee reach a temperature of 89 C.
display that Gauss' law is satisfied for the magnetic field due to a straight wire that carries a current I in the +z - direction for a volume that represents a portion of a cylindrical shell of height h, extending from a radius r to a radius R a..
A balloon rises at at constant velocity of 3m/s. A rock is released over the side. 4.5 seconds later this rock hits the ground. compute the height of the rock when it is halfway between the balloon and the ground. Assume Earth gravity (-9.81m/s), ..
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