Which of the following is a reason why early living organisms on Earth could not have survived on the land surface?
a. the lack of an ozone layer
b. the lack of oxygen in the atmosphere
c. the fact that these organisms were single-celled
d. the lack of oxygen
the lack of an ozone layer
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What happened to all of the quarks that existed freely during the particle era?
A) They froze out of the soup of particles at the end of the era. B) They combined in groups to make protons, neutrons, and their antiparticles. C) They evaporated. D) They combined in groups to make electrons and neutrinos.
A tuning fork is set into vibration with a frequency of 512 Hz. How many oscillations does it undergo in 1 minute?
A) 30700 B) 8.53 C) 26.8 D) 1610 E) 512
What frequency of electromagnetic radiation has photons of energy 4.7 × 10-25 J? (h = 6.626 × 10-34 J ? s)
A) 710 kHz B) 4.7 MHz C) 710 MHz D) 1.4 GHz
In Figure 9.1, the linear speed of P, when it reaches the y-axis, is closest to:
A) 0.18 m/s B) 0.24 m/s C) 0.35 m/s D) 0.49 m/s E) 0.71 m/s