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Q. At a rock concert, a dB meter registered 130 dB when placed 2.5 m in front of a loudspeaker on the stage. (a) What was the power output of the speaker, assuming uniform spherical spreading of the sound and neglecting absorption in the air? (b) How far away would the sound level be a reasonable 90 dB?
Q. A parallel beam of light from a He-Ne laser, with a wavelength of 662 nm, falls on two very narrow slits 0.050 mm apart. How far apart are the fringes in the center of the pattern if the screen is 2.5 m away?
What range is appropriate
A small piece of Styrofoam packing material is dropped from a height of 1.50 m above the ground. Until it reaches terminal speed, magnitude of its acceleration is given by a = g - bv. After falling 0.40 m, the styrofoam effectively reaches its ter..
Four or five gram blocks of metal are sitting out in the sun and absorb the same amount of heat energy. Use the following specific heat capacity data to resolve which block will increase its temperature the most.
A wheel has a radius of 3.6m. How far (path length) does a point on the circumference travel if the wheel is rotated by angles of 30°, 30 rad, and 30 rev, respectively.
A bead with a mass of 0.02 g and a charge of 20nC is free to slide on a vertical rod. At base of the rod is a fixed 20nC charge.
A child's toy consists of a piece of plastic attached to a spring. The spring is compressed against the floor a distance of 2.0 cm and released. If the spring constant is 85 N/m, what is the magnitude of spring force acting on the toy at the moment i..
After a tornado, a 0.60g straw was found embedded 3cm into the trunk of a tree. If the average force exerted on the straw by the tree was 90N, what was the speed of the straw when it hit the tree.
How long did it take the apple to hit Newton after falling off? Draw a graph of velocity vs
A 69 kg boy and a 40 kg girl use an elastic rope while engaged in a tug-of-war on an icy, frictionless surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find out the magnitude of the acceleration of the boy toward the girl.
Coherent light with wavelength 599nm passes through two very narrow slits, and the interference pattern is observed on a screen a distance of 3.00m from the slits. The first-order bright fringe is a distance of 4.84mm from the center of central brigh..
A skier is accelerating down a 30 degree hill at 3.60 m/s^2. How long would it take her to reach the bottom of the hill, assume she starts from rest and accelerates uniformly, if elevation change is 170m.
Describes possible scenarios among following
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