Because of their short lifetimes, very few muons that are produced in the upper atmosphere at high speeds should be observed at the surface of the Earth. Yet we detect large numbers of muons at ground level because of the special relativistic effect of __________
Fill in the blank(s) with correct word
time dilation
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Teflon tubing or 4 cm OD and 2.7 cm ID conducts 1.9 W/m when the outside temperature is 80ºC. Estimate the inside temperature of the tubing. Also predict the thermal resistance per unit length.
What will be an ideal response?
In the late 1990's, it was announced that the expansion of the Universe is accelerating. What does this imply from the perspective of the big bang?
a. A force exists that we knew nothing about that causes the acceleration. b. The Universe must be closed. c. The Universe is finite. d. The amount of dark matter must be greatly less than the amount of normal matter. e. The Universe must be infinitely old.
In a double slit experiment, a beam of electrons strikes a pair of slits. The slits are 15 ?m apart, and the first interference maximum lies at an angle of 0.50 µrad from the center of the interference pattern
What is the momentum of the incoming electrons? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 4.4 × 10-23 kg ? m/s B) 2.2 × 10-23 kg ? m/s C) 1.1 × 10-23 kg ? m/s D) 6.6 × 10-23 kg ? m/s E) 8.8 × 10-23 kg ? m/s
A lightbulb is plugged into a household outlet, and one of the wires leading to it is wound into a coil. Now a slug of iron is slid into the coil. What effect will this have?
A) The lamp will dim because energy will now be dissipated in the iron. B) The lamp will get brighter because there will be an induced emf that will drive more current through the lamp. C) The lamp will dim because a back emf will be produced by the coil, and this will reduce the current flowing in the coil and the lamp. D) This will have no effect on the brightness of the lamp. E) This will not affect the lamp's brightness because the coil will shift the phase, but not the magnitude, of the current through the lamp.