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Q. At a distance of 4.32m from a siren, the sound intensity is 3.75 x 10-2 W/m2. Assume that the siren radiates sound uniformly in all directions; find out the total power radiated.
Q. To recharge a 15V battery, a battery charger must move 3.3 x10^5 C of charge from the negative terminal to the positive terminal. How much work is done by the charger? State your answer in joules.
Calculate the x-component of vector. A uniform electric field of magnitude 375 N/C pointing in the positive x-direction acts on an electron, which is initially at rest.
However, the current increases by just 0.11 A when R1 is removed, leaving R2 connected across the battery. Find (a) R1 and (b) R2.
A major-league catcher gloves a 93 mi/h pitch and brings it to rest in 0.14m. If the force exerted by catcher is 803 N, what is the mass of the ball.
At 18°C, a rod is exactly 20 cm long on a steel ruler. Both the rod and the ruler are placed in an oven at 285°C, where the rod now measures 20.21 cm on the same ruler. What is the coefficient of linear expansion for the material of which the rod ..
An elevator releases 11200J of gravitational potential energy as descending 4m between floors. How much does elevator weigh.
A fireman 44 m away from a burning building directs a stream of water from a ground-level fire hose at an angle of 22° above the horizontal. If the speed of stream as it leaves the hose is 40m/s, at what height will stream of water strike the buil..
Liquid nitrogen has a boiling point of 77.3 K and a latent heat of vaporization of 2.01 105 J/kg. A 60.0-W electric heating element is immersed in an insulated vessel containing 46.5 L of liquid nitrogen at its boiling point. How various kilograms of..
He would like a prescription for contact lenses to serve the same purpose. What is the exact contact lens prescription, in diopters.
Two identical positive charges exert a repulsive force of 6.6 x10-9 N when separated by a distance of 5.4 10-10 m. what is the charge of each.
Barometric pressure in the eye of a hurricane is 0.91atm (27.2 in of mercury). How does the level of the ocean surface under the eye compare with the level under the distant fair-weather region where the pressure is 1.0atm.
A 250 gram sample of a metal is warmed from 60 degrees celcius to 85 degrees celcius when 1000 cal are added. What is the specific heat constant of the metal.
A constant horizontal force Fa pushes a 2 kg FedEx package across a frictionless floor on which an xy coordinate system has been drawn. It gives package's x and y velocity components versus time t. What is the magnitude of Fa.
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