If we are eventually able to detect Earth-like extrasolar planets directly, they will be seen very
A) close to their parent stars and will be very dim in comparison
B) far from their parent stars and will be very dim in comparison
C) far from their parent stars and will be bright in comparison
D) close to their parent stars and will be bright in comparison
A
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Lillian sees a chair at the Exploratorium that has been scaled up by three. In attempting to lift it, she finds the chair is
A) three times as heavy. B) six times as heavy. C) nine times as heavy. D) more than nine times as heavy.
Seen from the northern latitudes (mid-northern hemisphere), the star Polaris
a. is never above the horizon during the day. b. always sets directly in the west. c. is always above the northern horizon. d. is never visible during the winter. e. is the brightest star in the sky.
Calculate the kinetic energy (in eV) of a nonrelativistic neutron that has a de Broglie wavelength of 9.9 × 10-12 m. (h = 6.626 × 10-34 J ? s, mneutron = 1.675 × 10-27 kg, 1 eV = 1.60 10-19 J)
What will be an ideal response?
An electrical generating plant operates at a boiler temperature of 218°C and exhausts the unused heat into a nearby river at 24°C. What is the maximum theoretical efficiency of the plant? (0°C = 273 K)
a. 16% b. 62% c. 63% d. 40% e. 73%