A horizontal disk with a radius of 10 cm rotates about a vertical axis through its center. The disk starts from rest at t = 0 and has a constant angular acceleration of 2.1 rad/s2 . At what value of t will the radial and tangential components of the linear acceleration of a point on the rim of the disk be equal in magnitude?
a. 0.55 s
b. 0.63 s
c. 0.69 s
d. 0.59 s
e. 0.47 s
c
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Double-Slit Interference: Two radio antennas are 120 m apart on a north-south line. The two antennas radiate in phase at a frequency of 5.6 MHz. All radio measurements are made far from the antennas. What is the smallest angle, reckoned north of east from midway between the antennas, at which destructive interference of the two radio waves occurs? (c = 3.00 × 108 m/s)
A. 13° B. 6.4° C. 9.7° D. 16° E. 19°
How can you tell whether a sugar solution is saturated or not?
A) Add more sugar, if it dissolves, it is saturated. B) There will be a precipitate if the water is heated. C) Cool the solution to see if there is a precipitate. D) As long as there are more water molecules than sugar molecules, there is a saturated solution.
Which of the following planets has the least substantial atmosphere?
A) Venus B) Earth C) Mars D) Neptune E) Mercury
What is the ratio of the light-gathering power of a 5-m telescope to that of a 0.5-m telescope?
a. 10 b. 0.1 c. 0.01 d. 100 e. 25