A wheel rotating about a fixed axis has an angular position given by ? = 3.0 ? 2.0t3, where ? is measured in radians and t in seconds. What is the angular acceleration of the wheel at t = 2.0 s?
a. ?1.0 rad/s2
b. ?24 rad/s2
c. ?2.0 rad/s2
d. ?4.0 rad/s2
e. ?3.5 rad/s2
b
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Talk about vertigo! You've been dropped at the edge of a cliff, looking down for what seems to be miles! There's only one way to go from here: up! But it's going to be quite a climb, requiring all of the mountaineering skills you've ever heard of
The atmosphere here is very thin even at the mean surface level of this place; at altitude you'll never get a lungful. No matter, though; you could not breathe this atmosphere anyway, since it contains no oxygen; it's mostly carbon dioxide. You climb and climb; this mountain must be three times the height of Everest, and much broader at its base! There are clouds around you, and you can find water ice as well. When you try to melt it, however, it does not turn to liquid (it vaporizes to gas). Oh well, just keep climbing. But what will you do when you get to the top?
A 3.00-kg copper rod is 45.0 cm long at 24.8°C. If 45 000 J are transferred to the rod by heat, what is its change in length? ccopper = 387 J/kg/°C and ?copper = 17.0 × 10^?6/°C
a. 34.4 cm b. 0.0297 cm c. 0.133 cm d. 0.0445 cm e. More information is needed.
You are tuning a guitar by comparing the sound of the string with that of a standard tuning fork. You notice a beat frequency of 5 Hz when both sounds are present. You tighten the guitar string and the beat frequency rises steadily to 8 Hz. To tune the string exactly to the tuning fork, you should
1.continue to tighten the string. 2.loosen the string. 3.impossible to determine from the given information.
Single-Slit Diffraction: A single-slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the wavelength of the illuminating light is doubled?
A. It will be cut to one-quarter its original size. B. It will be cut in half. C. It will double. D. It will become four times as large. E. It will become eight times as large.