If ?o is less than one, then:
A) the universe is closed, and must recycle.
B) the universe will expand forever.
C) no matter could have existed.
D) only dark energy exists in the universe.
E) there is more matter than energy in the universe.
B
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Why modify the Grashof number for inclined surfaces?
What will be an ideal response?
Consider a Carnot cycle starting at the state of highest pressure and smallest volume. Call the isothermal expansion from this state step 1, the adiabatic expansion which follows step 2, the isothermal compression that then follows step 3, and the adiabatic compression which returns the system to the initial state step 4 . In which steps does the internal energy of the system increase?
a. 1 and 2 c. 1 and 3 b. 3 and 4 d. 2 and 4
After a supernova event, what is left behind?
A) always a white dwarf B) always a neutron star C) always a black hole D) either a white dwarf or a neutron star E) either a neutron star or a black hole
Conservation of Momentum: A 1200-kg cannon suddenly fires a 100-kg cannonball at 35 m/s. What is the recoil speed of the cannon? Assume that frictional forces are negligible and the cannon is fired horizontally.
A. 2.9 m/s B. 35 m/s C. 3.5 m/s D. 3.2 m/s