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1) Suppose the sound pressure level of each of three individual noise sources is measured at a point such that with each source running individually, the sound pressure is as follows:
Source 1 - 87 dB
Source 2 - 85 dB
Source 3 - 89 dB
What is the sound pressure level with all three running? (Show your work).
2) A compressor in a mechanical room was measured at 5 feet from the source to have a sound pressure level of 90 dB. What would the sound pressure level be at 10 feet from the source?
3)A compressor in a mechanical room was measured at 5 feet from the source to have a sound pressure level of 90 dB. If a second identical compressor was placed immediately next to the first, what would the resulting sound pressure level measurement at 5 feet be?
4)If an employee is exposed to continuous sound levels for 2 hours at 95 dB and is then exposed to sound levels below 65 dB for the rest of the 8 hour day, what is the employee's 8 hour TWA in dBA using OSHA's calculations? Does this employee exceed OSHA's PEL? Does this employee need to be in a hearing conservation program?
A diver springs upward from a diving board. At the instant she contacts the water, her speed is 9.50 m/s, Determine her initial velocity, both magnitude and direction
The time it takes to go from rest to 30 mph at constant deceleration can be measured to an accuracy of 1%. What is the percentage uncertainty in the distance travelled?
A capacitor with an initial potential difference of 75 V isdischarged through a resistor when a switch between them is closedat t = 0. At t = 5.0 s, the potential differenceacross the capacitor is 1.70 V.
A 7.1-kg block of aluminum is heated from 30°C to 60°C at atmospheric pressure. Find the work done by the aluminum
When the Mars rover was deployed on the surface of Mars in July 1997, radio signals took about 12.1 min to travel from Earth to the rover. How far was Mars from Earth at that time
Suppose the distance between two objects was doubled and the mass of one of the objects was suddenly cut in a third. How would the gravitational force change
You are flying to Chicago for a weekend away from the books. In your last physics class, you learned that the airflow over the wings of the plane creates a lift force , which acts perpendicular to the wings.
A 0.7 kg mass is moving in a circle of radius 1.5 m on a flat frictionless table at the end of a string. What is the angular momentum of the mass
A diffraction grating has6.0x105 lines/m. Find the angular spread in the second-order spectrum among red light of wavelength 7.0 x10-7m and blue light of wavelength 4.5 x 10−7 m.
1. a spring with negligible mass stretches 34.0 cm when a 144 g gram mass is suspended from it. now i suspend a mass m
A ray of light is incident oa an angle of 60 degree on once face of a rectangular glass slab of thickness 0.1m and refractive index 1.5. Calculate the lateral shift produced
A current of 30.0 mA is maintained ina single circular loop with a circumference of 2.40 m. A magnetic field of 0.590 T is directed parallel to the plane of theloop. What is the magnitude of the torque exerted on the loop by the magnetic field?
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