A star with a spectrum that peaks at a wavelength of 1 micron (1 × 10-6) would have a surface temperature of ________ and be an ________ star.
A. 2,900 K; O
B. 29,000 K; M
C. 2,900 K; M
D. 29,000 K; O
Answer: C
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When a falling meteor is at a distance above the Earth's surface of 3 times the Earth's radius, what is its acceleration due to the Earth's gravity?
During the inflation that started at about 10^-37 seconds after the Big Bang, the universe expanded by:
a. up to 10^50 in as little as 10^-47 seconds. b. up to 10^42 in as little as 10^-40 seconds. c. up to 10^30 in as little as 10^-36 seconds. d. by about a factor of 10 up to the present time. e. by no significant amount.
Polarization: As shown in the figure, the orientation of the transmission axis for each of three ideal polarizing sheets is labeled relative to the vertical direction. A beam of light, polarized in the vertical direction, is incident on the first polarizer with an intensity of 1.00 kW/m2. What is the intensity of the beam after it has passed through the three polarizing sheets when ?1 = 30°, ?2 = 30°, and ?3= 60°?
A. 141 W/m2 B. 316 W/m2 C. 433 W/m2 D. 563 W/m2 E. 188 W/m2
The position of an object as a function of time is given by x(t) = at3 – bt2 + ct - d, where a = 3.6 m/s3, b = 4.0 m/s2, c = 60 m/s, and d = 7.0 m
(a) Find the instantaneous acceleration at t =2.4 s. (b) Find the average acceleration over the first 2.4 seconds.