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At a recent rock concert, a dB meter registered 110 dB when placed 2.00 meters in front of a loudspeaker on the stage.
(a) Calculate the output power of the speaker, assuming a hemispherical radiation of the sound and neglecting absorption in the air?
W
(b) Determine how far away would the intensity level be a somewhat reasonable 85 dB?
m
A rifle bullet with a mass of 5.00g strikes and embeds itself in a block with a mass of 1.995kg that rests on a frictionless horizontal surface and is attached to a coil spring. What is the initial speed of the bullet
It is 155cm from your eyes to your toes. You're standing 190cm in front of the tall mirror. How far is it from your eyes to the image of your toes.
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A rectangular coil of 100 turns measure 40cm by 20cm. This coil is placed next to an electromagnet which is switched on, what are the induced voltage and current in the coil
A 65.5 kg firefighter slides down a pole while a constant frictional force of 300 N retards her motion. Find the maximum distance the spring is compressed
Suppose you have a spherical balloon filled with air at room temperature and 1.0 atm pressure; its radius is 12cm . You take the balloon in an airplane, where the pressure is 0.90 atm. If the temperature is unchanged, what's the balloon's new radius?..
A car initially traveling eastward turns north by traveling in a circular path at uniform speed, Determine its average acceleration during the 30.0-s interval
Assume a light ray hits the surface of the water in a container 39 inches deep at an angle of incidence of 18 degrees. Determine the time taken for the light to hit the bottom of the container
A person of mass 75 kg stands at the center of a rotating merry-go-round platform of radius 3.1 m and moment of inertia 1300 kg ·m2. Calculate the angular velocity when the person reaches the edge
a 0.100 kg rock is attached to a 2.00 m long string and swung in a horizontal circle at a speed of 30.0 ms. find the
A brave child decides to grab on to an already spinning merry-go-round. The child is initially at rest and has a mass of 26.5 kg. What is the moment of inertia of the merry-go-round with respect to its central axis
A playground is on the flat roof of a city school, 5.9 m above the street below (see figure). The vertical wall of the building is h = 7.40 m high, Find the speed at which the ball was launched
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