Vega is an A0 main sequence star. Based on this information, which statement is true?
a. Vega has a surface temperature that is less than the Sun
b. Vega has mass that is greater than the Sun
c. Vega is less luminous than the Sun
d. Vega has mass that is less than the Sun
e. Vega is located near the lower right hand corner on the HR diagram
b
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Electrons with a speed of 2.1 × 106 m/s are directed towards a 1.0-?m wide slit. An electron detector is placed 1.0 m behind the slit
How wide is the central maximum of the electron diffraction pattern on the detector? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg) A) 690 ?m B) 350 ?m C) 1,000 ?m D) 1,400 ?m
Sonic Booms: As a supersonic airplane increases its speed more and more, the half-angle of the conical shock wave
A. increases. B. decreases. C. is not affected.
Pennies used to be made of copper, but now they are made of copper-coated zinc. If one were to do a precise calorimetry experiment to determine the specific heat of the new pennies, what would the result be?
a. It would be that of copper since copper is on the outside. b. It would be that of zinc since zinc is in the center. c. It would be the sum of the copper and zinc specific heats. d. It would be between that of copper and that of zinc, depending on coating thickness.
If a precipitation hardened alloy that is aged to peak strength is heated during processing to produce the part, the strength may be _________.
Fill in the blank(s) with the appropriate word(s).