Sound traveling in air at 23.°C enters a cold front where the air temperature is 2.°C. If the sound frequency is 1500. Hz, determine the speed in the warmer air and in the colder air
What will be an ideal response?
345. m/s; 332. m/s
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Where do we find our Sun on the H-R diagram?
A) near the middle of the main sequence B) at the far upper left of the main sequence C) with the red giants D) at the far lower right of the main sequence E) with the white dwarfs
Hubble's law is the major basis for the concept that the universe is
a. static. b. evaporating. c. contracting. d. expanding.
If two uncharged objects are rubbed together and one of them acquires a positive charge then the other one
A) remains the same. B) also acquires a positive charge. C) acquires a negative charge. D) may or may not acquire a positive charge. E) may or may not acquire a negative charge.
A battery has some internal resistance. Can the terminal voltage exceed the emf?
1.No. 2.Yes, if the battery is absorbing energy by electrical transmission. 3.Yes, if more than one wire is connected to each terminal. 4.Yes, if the current in the battery is zero. 5.Yes; no special condition is required.