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An outside loudspeaker (considered a small source) emits sound waves with a power output of95W.
(a) Find the intensity9.0m from the source.
W/m2
(b) Find the intensity level in decibels at that distance.
dB
(c) At what distance would you experience the sound at the threshold of pain, 120 dB?
m
A converging lens has a focal length of f = 22 cm. If an object is placed 42 cm from the lens, where will the image be formed
A block is dropped onto a spring with k = 33 N/m. The block has a speed of 3.4 m/s just before it strikes the spring. what is the mass of the block
The potential at the center of a uniformly charged ring is 52 kV, and 15 cm together the ring axis the potential is 41 kV. Find the ring's radius and its total charge.
A wheel rotates with a constant angular acceleration of 3.75 rad/s2. Assume the angular speed of the wheel is 2.20 rad/s at ti = 0. Through what angle does the wheel rotate between t = 0 and t = 2.00 s
A 1000 {rm kg} wrecking ball hangs from a 15 {rm m}-long cable. The ball is pulled back until cable makes an angle of 25.0^circle with the vertical. By how much has the gravitational potential energy of the ball changed .
A 2.0-kg cart is rolling along a frictionless, horizontal track towards a 1.0-kg cart that is held initially at rest. find the total momentum of the system of the two carts
A sailor strikes the side of his ship just below the surface of the sea. He hears echo of the wave reflected from the ocean floor directly below 9 s later. How deep is the ocean at this point.
A spiral staircase winds up to the top of a tower in an old castle. To measure the height of the tower, a rope is attached to the top of the tower and hung down the center of the staircase. What is the height of the tower
A person walks first at a constant speed of 4.60 m/s along a straight line from point Ato point B and then back along the line from B toA at a constant speed of 2.90m/s. What is her average speed over the entiretrip?
Suppose we have a cube of resistors (12 resistors total) all the same resistance R connects as in the figure to left. Find the equivalent resistance between the two diagonally opposite corners
A person weighs 75 N on the surface of the moon and 427 N on the surface of the Earth. What is the acceleration of gravity on the surface of the moon
A rod of 2.0-m length and a square (2.0 mm x 2.0 mm) cross section is made of a material with a resistivity of 6.0 x 10 ^-8 ohms m. What is heat generated in the rod
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