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Q.Use this technique to find a formula for the intensity I of a sound, in terms of the sound level beta and the reference intensity I_0. There will be a quantity (10 {rm dB}) involved in your calculations. When you enter your answer, leave off the unit rm dB.
Q. A plate carries a charge of -3.7 µC, while a rod carries a charge of +1.9 µC. How many electrons must be transferred from the plate to the rod, so that both objects have the same charge?
A car battery stores about 3.00 MJ of energy. If all this energy were used to generate a uniform electric field of 27.0 kV/m, what volume would it occupy.
A certain loudspeaker has a diameter of 45 cm. At what frequency would the wavelength of sound it emits in air be equal to its diameter.
What is the electric field strength a point on the axis 5.0 cm from one disk between them.
Two narrow slits 62um apart are illuminated with light of wavelength 480nm . What is an angle of the bright fringe in degrees.
A 0.15 kg ball is placed in a shallow wedge with an opening angle of 150.For each contact point between the wedge and ball, find out the force exerted on the ball. Assume the system is frictionless.
A 120-g mug at 21C is filled with 210g of coffee at 91C. suppose all of the heat lost by the coffee is transferred to the mug, what is the final temperature of the coffee? The specific heat capacity of the mug is 7.8 X 10^2 J/(Kg C)
These two isotopes are singly ionized (+e) and each is given a speed of 6.00 x105 m/s.
The shaft shown below has a solid round cross-section & is supported by bearing at A & B. Find the location of maximum bending stress in the shaft.
A car is parked on a steep incline, making an angle of 37.0° below the horizontal and overlooking the ocean, when its brakes fail and it begins to roll. Starting from rest at t = 0, the car rolls down the incline with a constant acceleration of 3...
What is order of the layers from top to bottom
What tension in Newtons should a 50cm length of string support in order to whirl an attached 2000g stone in a circular path at 5 m/s.
A wooden raft has a mass of 67 kg. When empty it floats in water (density 1000 kg/m3) with 51 percent of its volume submerged. What mass of sand can be put on the raft without it sinking.
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