To decrease the intensity of the sound you are hearing from your speaker system by a factor of 36, you can
a. reduce the amplitude by a factor of 12 and increase your distance from the speaker by a factor of 3.
b. reduce the amplitude by a factor of 4 and increase your distance from the speaker by a factor of 3.
c. reduce the amplitude by a factor of 2 and increase your distance from the speaker by a factor of 3.
d. reduce the amplitude by a factor of 3 and increase your distance from the speaker by a factor of 4.
e. reduce the amplitude by a factor of 3 and increase your distance from the speaker by a factor of 12.
c
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A 2.0 kg mass is moving along the x-axis. The potential energy curve as a function of position is shown in the figure. The kinetic energy of the object at the origin is 12 J. The system is conservative, and there is no friction
(a) What will be the kinetic energy at 2.0 m along the +x-axis? (b) What will be the speed of the object at 6.0 m along the +x-axis? What will be an ideal response?
In principle, if we could see all the way to the cosmological horizon we could see the Big Bang taking place. However, our view is blocked for times prior to about 380,000 years after the Big Bang. Why?
A) Before that time, the universe was too crowded with stars. B) Before that time, the gas in the universe was dense and ionized and therefore did not allow light to travel freely. C) Before that time, the universe was dark so there was no light to illuminate anything. D) 380,000 years after the Big Bang marks the time when stars were first born, and thus began to shine the light by which we can see the universe.
A common fuel impurity in fossil fuels is
a. sulfur. b. radon. c. carbon. d. hydrogen.
A crying baby emits sound with an intensity of 8.0 × 10-8 W/m2. What is the intensity level for a set of quintuplets? The lowest detectable intensity is 1.0 × 10-12 W/m2
A) 79 dB B) 69 dB C) 56 dB D) 49 dB E) 36 dB