What do Pioneer 10 and 11 and Voyager 1 and 2 all have in common?
What will be an ideal response?
All four of them flew past Jupiter, and all but Pioneer 10 past Saturn as well. All are now moving so fast from the gravity assists that they are far beyond Pluto, and escaping the Sun's gravity entirely, to become eventually lost in interstellar space.
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A neutral atom always contains
a. the same number of protons as it does neutrons. b. the same number of electrons as it does neutrons. c. the same number of protons as it does electrons. d. twice as many protons as it does neutrons. e. twice as many neutrons as it does protons.
Two capacitors with capacitances of 1.0 mF and 0.50 mF, respectively, are connected in series. The system is connected to a 50-V battery. What electrical potential energy is stored in the 1.0-mF capacitor?
a. 5.6 × 10^-4 J c. 0.065 × 10^-3 J b. 4.3 × 10^-3 J d. 1.4 × 10^-4 J
An ideal gas is allowed to undergo a free expansion. If its initial volume is V1 and its final volume is V2, the change in entropy is
A. nR ln (V2/V1) B. nRT ln (V2/V1) C. nk ln (V2/V1) D. 0 E. nR V2/V1
The universe formed Helium nuclei in a process called nucleosynthesis. At that time, what fraction of the mass was converted to Helium nuclei (2 protons and 2 neutrons)?
A. 2 percent B. 50 percent C. 25 percent D. 99 percent E. 1 percent