Suppose that the build-up of fatty tissue on the wall of an artery decreased the radius by 10%. By how much would the pressure provided by the heart have to be increased to maintain a constant blood flow?
A)
48%
B)
52%
C)
50%
D)
46%
E)
54%
B
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A 320-g air track cart traveling at 1.25 m/s suddenly collides elastically with a stationary 270-g cart. What is the speed of the 270-g cart just after the collision?
A) 0.678 m/s B) 0.106 m/s C) 1.36 m/s D) 1.14 m/s E) 2.72 m/s
A problem with the Bohr model of the atom is that electrons circling the nucleus
A) accelerate and should continuously emit radiation. B) lose energy and should spiral into the nucleus. C) both of these D) neither of these
Which of the following would make the demonstration illustrated in this figure function less effectively?
a. Use a piece of cardboard with a greater mass. b. Use a piece of cardboard with a greater radius. c. Use a piece of cardboard with less mass and smaller radius. d. Use a thinner pencil. e. Use a thicker pencil.
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)?