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1. A sound wave with a sound level (Beta) of 80.0 dB is incident on an eardrum of area 0.600 x10 ^-4 m^2. how much ebergy is absorbed by the eardrum in 3 minutes?
2. At point A, 3,00 m from a small source of sound that is emitting uniformly in all directions, the sound level is 53.0 dB.
a) what is the intensity of the sound at point A?
b) How far from the source would the intensity of the sound be 1/4 the intensity at point A?
c) How far from the source would the sound level be 1/4 of the sound level at point A?
Neil A. Armstrong was the first person to walk on the moon. The distance between the earth and the moon is 3.85 ? 108 m. Find the time it took for his voice to reach earth via radio waves
If a person radiates about 67 W of power at room temperature, how long does it take for a person to radiate away the energy acquired by consuming a 260 Calorie donut?
A transformer has 350 primary turns and 1290 secondary turns. The input voltage is 120?V and the output current is 15.5A . Assume100% efficiency, What is the output voltage
King Arthur's knights fire cannon from the top of the castle wall. The cannonball is fired at a speed of 60 m/s and an angle of 33. A cannonball that was accidentally dropped from the top of the castle wall hit the moat below in 1.80s.
A 150MW laser pulse is focused with a lens to a diameter of 1.0?m. What is the laser beam's electric field amplitude at the focal point
A common flashlight bulb is rated at 0.300 A and 2.60 V, what is the temperature of the filament when the bulb is on? Calculate in deg Celsius
How did Pavlov and Watson's focus on scientific inquiry of behaviours differ from earlier viewpoints of structuralisms, psychoanalysts, and functionalists.
Consider an athlete who jumps a horizontal distance of 9m after reaching a maximum height of 1.5m. What was the takeoff speed v0 of the athlete
An iron rod of diameter 2.6 cm and length 80.0 cm is to be inserted inside a long solenoid to make an electromagnet. how many turns of wire will be needed for the solenoid
A mass of 400 grams hangs from the rim of a wheel of radius 15cm. When released from rest, the mass falls 2 m in 6.5 sec. Find the moment of inertia of the wheel
A two-ended "rocket" that is at first stationary on a frictionless floor, with its center an origin of an x axis.
Suppose you have a lens system that is to be used primarily for 770 nm light. What is the second thinnest coating of fluorite that would be nonreflective for this wavelength
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