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The intensity of the sound from a certain source is measured at two points along a line from the source. The points are separated by 12.9 m, the sound level is 66.30 dB at the first point and 57.61 dB at the second point.
How far is the source from the first point?
Calculate the power output of the source?
The drive shaft AB of an automobile is to be designed as a thin-walled tube. The engine delivers 125 kW when the shaft is turning at 1500 rev/min. Determine the minimum thickness of the shaft's wall
A 1.60 kg mass is attached to a light cord that is wrapped around a pulley of radius 6.80 cm, which turns with negligible friction. Find the moment of inertia of the pulley
If the average energy released in a fission event is 208 MeV, calculate the total number of fission events required to operate a 140 W lightbulb for 6.00 hr
A stamp collector is viewing a stamp with a magnifying glass held next to her eye. Her near point is 22 cm from her eye. What is the refractive power of a magnifying glass that has an angular magnification of 6.32 when the image of the stamp is loca..
a 0.060 kg tennis ball, initially moving at a speed of 10 m/s, What is the change in momentum of the ball in kg m/s
Life scientists use ultracentrifuges to separate biological components or to remove molecules from suspension. Samples in a symmetric array of containers are spun rapidly about a central axis.
A firm has net income for the year of $32,600. at the beginning of the year, the firm had common stock of $88,000, find the amount of the net new equity raised during the year
A certain dam is holding back fresh water 203 m deep. What is the water pressure at the base of the dam
A uniform plank of length 5 m and weight 231 N rests horizontally on two supports, with d = 1.43 m of the plank hanging over the right support. To what distance, x, can a person who weighs 446 N walk on the overhanging part of the plank before it ..
Consider a 9.5-mm-diameter wire made from copper (mass density 8.9 g/cc, resistivity 1.7E-8 ohm-m). What is the electric field (in V/m) in the wire
A rifle with a barrel length of 59cm fires a 10g bullet with a horizontal speed of 440m/s. How long does it take the bullet to come to rest after entering the wood
A 4.98-kg pendulum bob, at a height of 0.720 m above the floor, is released and swings down to the ground, Find how high up the incline the block will slide
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