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1) A man stands at the midpoint between two speakers that are broadcasting an amplified static hiss uniformly in all directions. The speakers are 32.7 m apart and the total power of the sound coming from each speaker is 0.545 W.
(a) Find the total sound intensity that the man hears when he is at his initial position halfway between the speakers.
(b) Find the total sound intensity that the man hears after he has walked 3.7 m directly toward one of the speakers. 2) When one person shouts at a football game, the sound intensity level at the center of the field is 62.2 dB. When all the people shout together, the intensity level increases to 105 dB. Assuming that each person generates the same sound intensity at the center of the field, how many people are at the game?
To the unaided eye, the planet Jupiter has an angular diameter of 50 arc seconds. What will its angular size be when viewed during a 0.75 m focal length refracting telescope by an eyepiece whose focal length is 30 mm?
A soccer ball is kicked with an initial speed of 30 m/s at an angle of 25 degrees with respect to the horizontal. Find the maximum height reached by the ball
A 31.2cm diameter coil consists of 17 turns of circular copper wire 1.70mm in diameter. The resistivity of copper is 1.68×10-8 Ohm m. Determine the current in the loop
A 43kg block of ice slides down the frictionless incline 1.50m long and 0.82m high. A worker pushes up against the ice, parallel to the incline, so that the block slides down at constant speed.
In a Broadway performance, an 65.9-kg actor swings from a 3.30-m-long cable that is horizontal when he starts. What maximum height do they reach after their upward swing
A typical nuclear power plant delivers heat from the reactor to the turbines at a temperature of 480°C. what is the maximum possible efficiency of these turbines
A baseball (m = 145 g) traveling40 m/s moves a fielder's glove backward15 cm when the ball is caught. What was the average force exerted by the ball on the glove
A transformer with a turns ratio (secondary/primary) of 1:11 is used to step down the voltage, determine the voltage supplied to the recharger
An Otto cycle has the lowest temperature at 290 K and the lowest pressure at 85 kPa. How much power does it produce
A ball is launched directly upward from ground level with aninitial speed of 19 m/s. (Air resistanceis negligible.) How long is the ball in the air? What is the greatest height reached by the ball?
Adding a dielectric between the plates of an air capacitor decreases its capacitance. The capacitance of a parallel plate capacitor is proportional tothe area of the plates. Capacitance is the property of a device that enables it to storecurrent.
A jet airplane in level flight has a mass of8.62104kg, and the two wings have an estimated total area of89.0m2. If the speed of air under the wings is232m/s, what is the speed of the air over the wings
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