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At a rock concert, the engineer decides that the music isn’tloud enough. He turns up the amplifiers so that the amplitude ofthe sound where you are sitting increases by 50.0%.
a) By what numerical factor does the intensity change?b) By how much does the sound intensity level change?
A power supply maintains a potential difference of 81.5 V across a 1.01-k? resistor. What is the current in the resistor in milliamperes?
In a head-on collision, a car stops in 0.29 {s} from the speed of 28 {m/s}. The driver has a mass of 78 {kg}, and is, fortunately, tightly strapped into his seat. what force is applied to driver during that fraction of a second.
A light rope 5m long supports a 30kg mass against gravity. What is the mass per unit length of the rope
Mars rotates on its axis once every 24.8 hours, its mass is 6.42×1023 kg and its radius is 3.37×106 m. Estimate the maximum speed that an astronaut can walk on the surface of Mars
The output voltage of an AC generator is given by ?v = (200 V) sin (70?t). The generator is connected across a 19.0-? resistor. Find the power delivered to the resistor
When the dried up seed pod of a scotch broom plant bursts open, it shoots out a seed with an initial velocity of 3.0 m/s at an angle of 60.0° above the horizontal. What horizontal distance does it cover during its flight
a 500 omh resistor and a real inductor with a pure inductance L and an internal resistance of r are in series with a generator with a voltage of V = 10.0V, What are the values of L and r
A motorist suddenly notices a stalled car and slams on the brakes, negatively accelerating at 6.4 . Unfortunately this isn't enough, and a collision ensues. From the damage sustained, police estimate that the car was going 18 at the time of the co..
Discuss the cause and different mechanisms available. Recognize and discuss the flow control techniques on which they are based? Determine the pros and cons of each?
Four identical particles of mass 0.608 kg each are placed at the vertices of a 4.08 m x 4.08 m square and held there by four massless rods, What is the rotational inertia of this rigid body
Two magnetizable materials are placed adjacent to each other. The boundary defines the j-k plane with i pointing from thematerial with μ1 to the material with μ2. Find the surface current density
A 10 runaway grocery cart runs into the spring with spring constant 230 and compresses it by 65. What was the speed of the cart right before it hit the spring.
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