A typical meteor is created by a particle about the size of a
A) baseball.
B) pea.
C) car.
D) basketball.
B
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The best way to use a telescope to look for life on other planets is to
a. search for absorption from nitrogen in their atmospheres. b. search for absorption from oxygen in their atmospheres. c. search for emission lines from water vapor in their atmospheres. d. search for carbon dioxide on their moons.
The 2.4-m diameter Hubble space telescope has been placed into Earth orbit by the space shuttle. Assuming a wavelength of 710 nm, what angular resolution could this telescope achieve by Rayleigh's criterion? (1 nm = 10-9 m)
a. 5.7 × 10^-6 rad c. 3.6 × 10^-7 rad b. 7.5 × 10^-6 rad d. 2.5 × 10^-7 rad
What is one relationship of superconductors to magnets?
a. Superconductors draw in their own magnetic fields and thus attract magnets. b. Superconductors affect nearby magnetic fields. c. Superconductors expel their own magnetic fields and thus repel magnets. d. Superconductors have no more relation to magnetic fields than ordinary conductors. e. Superconductors can be used to create magnetic monopoles.
Two objects collide and stick together. Which of the following is false?
A. momentum is conserved B. kinetic energy is lost C. kinetic energy is conserved D. momentum is lost