About what percentage of the mass of the solar nebula consisted of hydrogen and helium gas?
A) 0.5 percent
B) 5 percent
C) 50 percent
D) 98 percent
E) 100 percent
D) 98 percent
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Uniform Circular Motion: Pulling out of a dive, the pilot of an airplane guides his plane into a vertical circle. At the bottom of the dive, the speed of the airplane is 320 m/s. What is the smallest radius allowable for the vertical circle if the pilot's apparent weight is not to exceed 7.0 times his true weight?
A. 1700 m B. 1500 m C. 2200 m D. 230 m E. 42 m
Creation science claims that scientific evidence can and does prove God made the universe. Select the statement which does not identify a legitimate objection to this claim. (Recall the hallmarks of science.)
A) If "God did it" is the explanation for everything, then final exams in astronomy would be very simple (all answers would be the same!), and science experiments would be very easy to explain, but we wouldn't learn much about the natural world. B) Science cannot prove (or disprove) the existence of a superpowerful, supernatural deity. C) The statement that "God did it" cannot be falsified by science, and therefore it is not a statement that science can test. D) Scientists are not allowed to believe in God.
Coulomb's Law: The three point charges +4.0 ?C, -5.0 ?C, and -9.0 ?C are placed on the x-axis at the points x = 0 cm, x = 40 cm, and x = 120 cm, respectively. What is the x component of the electrostatic force on the -9.0 ?C charge due to the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. -0.55 N B. 0.55 N C. 0.64 N D. 0.41 N E. -0.41 N
If the intensity of a sound is increased by a factor of 100, how is the decibel level affected?