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A woman stands a distance d from a loud motor that emits sound uniformly in all directions. The sound intensity at her position is an uncomfortable 5.32 x 10-3 W/m2. At a position twice as far from the motor, compute the following.
a) the sound intensity?
b) the sound intensity level relative to the threshold of hearing?
To test the working of a refrigerator you put a container having two liters of water (=2kg) at 50C in its freezer. How much heat has the refrigerator extracted from the water
A tungsten wire has a radius of 0.065 mm and is heated from 20.0 to 1425 oC. The temperature coefficient of resistivity is ? = 4.5 x 10-3 (Co)-1. When 190 V is applied across the ends of the hot wire, a current of 1.4 A is produced. How long is the w..
A baton twirler throws a spinning baton directly upward. As it goes up and returns to the twirler's hand, the baton turns during 5.53 revolutions. Ignoring air resistance and assuming that the average angular speed of the baton is 2.21 rev/s, decide ..
A certain source of sound wavesradiates uniformly in all directions. What is the total acoustic power output of the source in watts
Galaxy mergers in a rich cluster could impede their use as standard candles over time as they tend to brighten. What is the mean number density of galaxies within the half mass radius
(from Roger Ordidge, with alterations) The magnetic field can store energy, but it can do no work. Therefore, another agency must be responsible for doing the work that puts the energy into the magnetic field. In order for the energy in the field ..
A 0.150 kilogram ball that is thrown at a velocity of 30.0 m\s hits a wall and bounces back in the opposite direction by a speed of25.0m\s. How much work was done by the ball?
Two waves with identical frequency but different amplitudes A1 = 6.0 cm and A2 = 3.0 cm, What is its amplitude if they interfere destructively
2150 kg satellite is in a circular orbit 780 km (780 x 103 m) above the surface of the earth. What is the speed of the satellite in its orbit
A proton and an electron have the same kinetic energy upon entering a region of constant magnetic field. What is the ratio of the radii of their circular paths
a pirate is swimming 4.85 feet under water as he approaches a rival ship. when he is 30.5 feet from the ship he looks
In order better to map the surface features of the Moon, Calculate the satellite\'s kinetic energy, gravitational potential energy, and total orbital energy
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