The spacing of the atoms in the H2 molecule is 7.4 x 10-11 m. What is the energy of the L = 1 rotational level?
A)
9.0 x 10-2 eV
B)
7.0 x 10-2 eV
C)
4.5 x 10-2 eV
D)
3.0 x 10-2 eV
E)
1.5 x 10-2 eV
E
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Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we go through the motions of throwing the ball but hold onto it, our net recoil will be
A) zero. B) the same as before. C) small, but noticeable.
How many water molecules are there in 36. g of water? Express your answer as a multiple of Avogadro's number NA. (The molecular structure of a water molecule is H2O.)
A) 18. NA B) 2.0 NA C) 36. NA D) 3.0 NA E) 0.020 NA
A ball is thrown downward in the absence of air resistance. After it has been released, which statement(s) concerning its acceleration is correct? (There could be more than one correct choice.)
A) Its acceleration is constantly decreasing. B) Its acceleration is constant. C) Its acceleration is constantly increasing. D) Its acceleration is zero. E) Its acceleration is greater than g.
Water (density = 1.00 × 10^3 kg/m3) flows at 7.2 m/s through a pipe with radius 0.025 m. The pipe goes up to the second floor of the building, 2.00 m higher, and the pressure remains unchanged. What is the radius of the pipe on the second floor?
a. 0.019 m b. 0.036 m c. 0.0013 m d. 0.23 m e. 0.022 m