Two astronauts, of masses 60. kg and 80. kg, are initially at rest in outer space. They push each other apart. What is their separation after the heavier astronaut has moved 12. m?
A) 21. m
B) 24. m
C) 16. m
D) 9. m
E) 28. m
E
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Energy Levels:Consider the Bohr model for the hydrogen atom. (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s) (a) How much energy (in eV) is needed to cause a transition of an electron from the second excited state to the third excited state?(b) What wavelength photon just has enough energy to initiate the transition in (a)?
What will be an ideal response?
A car's engine is 20% efficient. When cruising, the car encounters an average retarding force of 1000 N. If the energy content of fuel is 40 megajoules per liter, how many kilometers per liter does the car achieve?
A) 8 B) 10 C) 12 D) 14 E) none of the above
Which of the following statements does not apply to the formation of gas giants like Jupiter, compared to terrestrial planets?
A) accreted from icy planetesimals B) formed in a region with lower orbital speeds C) surface dramatically altered during bombardment D) caused icy planetesimals to slingshot away from the Sun, to become Oort cloud comets E) formed in regions cold enough for water to freeze
Long-period comets originate in the _______________
Fill in the blank(s) with correct word