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Hearing damage may occur when a person is exposed to a sound intensity level of 90.0 dB (relative to the threshold of human hearing) for a period of 9.00 hours. An eardrum has an area of 3.48 x 10-4 m2. How much sound energy is incident on the eardrum during this time?
A ray of light is incident at an angle of 30 deg. to the normal on an air glass interface. find the angle the refracted ray makes to normal
A .30-06 rifle fires a bullet with a mass of 10 g at a velocity of 800 m/s. If the rifle has a mass of 4 kg, what is its recoil speed
A person is 1.4 m tall, and is standing at 2.0 m in front of a plane mirror. What is the minimum length of the mirror if the person is now 3.5 m from the mirror
A 3.25-kg object is moving in a plane, with its x and y coordinates given by x = 2t2 ? 4 and y = 4t3 + 4, Find the magnitude of the net force acting on this object
An electron is in the fifth Bohr orbit of hydrogen. Calculate the time required for the electron to circle the nucleus
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.50 104 m/s, and the radius of the orbit is 5.45 106 m. What is the orbital speed of the second satellite
A capacitor consists of a set of two parallel plates of area A separated by a distance d. find the magnitude of the charge on the plates
A student could either pull or push, at an angle of 30â?? from the horizontal, a 45kg crate on a horizontal surface, Calculate the minimum work required for both pulling and pushing
A Nextrad wave of 2.70 GHz was sent out. If it took 3.75 ms to get the returning signal from a storm weather system, how far away is the storm
An amateur radio operator wishes to build a receiver that can tune a range from 13.8 MHz to 15.1MHz, What is the required value of the constant inductance
The box is taken up a mountain where the air pressure outside the box is 8.00 104 Pa. The inside of the box is completely evacuated. Elucidate the magnitude of the force required to pull the lid off the box?
A bicycle tire with a radius of 0.42 m has a linear velocity of 2.6 m/s and an tangential acceleration of - 1.0 m/s2. What is the angular velocity of the tire
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