Compared to the Earth, the moon is no longer geologically active because
a. it is rotating too slowly.
b. its radioactive elements were never abundant.
c. it is much smaller in mass.
d. its crust is too thin.
e. it does not have water on its surface.
C
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A debris disk is a disk of dust found by infrared observations around some stars
Indicate whether the statement is true or false
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
Which of the following normally warms up fastest when heat is applied?
A) water B) iron C) glass D) wood E) all of the above
Rank the following five capacitors in the order of the energy they store
(a) a 20-µF capacitor with a 4-V potential difference between its plates (b) a 30-µF capacitor with charges of magnitude 90 µC on each plate (c) a capacitor with charges of magnitude 80 µC on its plates, differing by 2 V in potential, (d) a 10-µF capacitor storing energy 125 µJ (e) a capacitor storing energy 250 µJ with a 10-V potential difference
1.e > a > b > d > c 2.e > d > a > b > c 3.c > b > a > d > e 4.b > a = c > d = e