The heating element in an electric drier operates on 240. V and generates heat at the rate of 2.00 kW. The heating element shorts out and, in repairing it, the owner shortens the Nichrome wire by 10%
(Assume the temperature is unchanged, although in reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element?
Power dissipated increases to 2.22 kW.
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We describe a location on Earth's surface by stating its ________
A) latitude and direction B) latitude and longitude C) altitude and direction (or azimuth) D) meridian and longitude
Two students are working on the same constant-acceleration problem involving a car undergoing constant acceleration, having started from rest and after a certain time having traveled a distance of 108 m. The students are to find the average velocity. Both students are required to show their work and round any intermediate answers as well as the final answer properly to 3 significant figures. Each
rounded answer is to be used in the next step of calculation as they proceed. For the final answer, Student A uses the formula vavg = (xf – xi)/(tf – ti) getting the result 7.26 m/s, and Student B uses the formula vavg = (v0 + v)/2 getting the result 7.29 m/s. Assuming neither student makes a mistake, which student has the better answer? a. Student A b. Student B c. Under significant figure rounding, both answers are equally as good. d. The described result cannot happen; this is physics after all.
If spectroscopic luminosity classification gives us an estimated distance to the faint star SAO 47552 of about 3300 light-years, then its parallax would be only
A) 0.1". B) 0.01". C) 3.3". D) 0.033". E) 0.001".
Why doesn't a small piece of uranium go naturally into a chain reaction?
a. Because none of its nuclei fission without bombardment from human-controlled sources. b. Because only large chunks of uranium do this naturally. c. Because in a small sample, too small a fraction of neutrons released from each fission are captured to trigger another reaction. d. Because a small piece of uranium is mostly uranium-238. e. Because even a small chunk is too large to sustain a chain reaction.