A wheel rotates about a fixed axis with an initial angular velocity of 20 rad/s. During a 5.0-s interval the angular velocity increases to 40 rad/s. Assume that the angular acceleration was constant during the 5.0-s interval. How many revolutions does the wheel turn through during the 5.0-s interval?
a. 20 rev
b. 24 rev
c. 32 rev
d. 28 rev
e. 39 rev
b
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The terminals of a battery are connected across two resistors in parallel. The resistances of the resistors are not the same. Which of the following statements is correct? Choose all that are correct
1.The resistor with the larger resistance carries more current than the other resistor. 2.The resistor with the larger resistance carries less current than the other resistor. 3.The potential difference across each resistor is the same. 4.The potential difference across the larger resistor is greater than the potential difference across the smaller resistor. 5.The potential difference is greater across the resistor closer to the battery.
An ideal gas is at a temperature of 60
and a pressure of 1.50 atmospheres. What is the volume per particle of the gas?
a. 
b. 
c. 
d. 
e. 
A few decades ago, there was great controversy among astronomers over the question of quasar distances, with some arguing that quasars are much nearer than application of Hubble's law would seem to imply
Why do nearly all astronomers now agree that quasars really are quite far away? A) We now have images and spectra that show quasars to be embedded at the centers of distant galaxies and within distant galaxy clusters. B) All quasars have large redshifts. C) Now that we can explain bright quasar emission with power due to the presence of supermassive black holes, there is no reason to doubt that quasars are far away. D) No one could think of a way to explain quasar speeds if they are nearby, so we concluded they must be far away.
A microphone in the ocean is sensitive to the sounds emitted by porpoises. To produce a usable signal, sound waves striking the microphone must have an intensity of 1.02 × 10^?11 W/m2 . If porpoises emit sounds with a power of 0.049 9 W, how far away can a porpoise be and still be heard? Disregard absorption of sound waves by the water