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A weather emergency siren is mounted on a tower, 117 meters above the ground. On one hand, you would like to make the siren very loud so that it will warn as many people as possible. On the other hand, safety regulations prohibit you from exceeding an intensity level of 111 dB for workers standing on the ground directly below the siren. Assuming that the sound is uniformly emitted, what is the maximum power that the siren can put out? How far away from the base of the tower can a person be and still be able to hear the siren?
The temperature of 3.00 mol of an ideal diatomic gas is increased by 40 degrees C without a change in pressure, How much energy is transferred to the gas as heat
Three moles of a monatomic ideal gas are heated at a constant volume of 1.12 m3. The amount of heat added is 5.89 x 103 J. Determine the change in pressure
A rescue helicopter lifts a 85.3-kg person straight up by means of a cable. Use the work-energy theorem and find the final speed of the person
If a discus thrower rotates through the last 46 degrees of a turn in 0.11 seconds and the distance from the axis of rotation to the center of the discus is 1.22m
a car moving at 10.0 m/s encounters a bump that has a circular cross-section with radius of 30.0m, What is normal force exerted by the seat of the car
Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^?2cm, Find its speed (vfinal) when it strikes the anode
if you throw a ball upward with an initial speed of 4m/s at 1.5 above the ground, find the final velocity just before touching the ground
A person can change the volume of his body by taking air into his lungs. The amount of change can be determined by weighing the person under water. Find the change in body volume
A spherically spreading EM wave has an average intensity of 570 mW/m2 at a point 9.5 m away from the source. What is the rms value of the electric field
The heating coil of a hot-water heater has a resistance of 20.0 and operates at 210 V. If electrical energy costs $0.080/kWh, what does it cost to raise 290 kg of water in the tank from 15 °C to 74° C.
A particle travels horizontally between two parallel walls separated by 18.4 m. It moves toward the opposing wall at a constant rate of 7.7 m/s. What will be its speed when it hits the opposing wall
What is the greatest weight W that can be supported this way without pulling out the nail? What is the magnitude of the force that the hinge exerts on the pole.
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