A stable nucleus contains many protons very close to each other, all positively charged. Why do the protons not fly apart due to mutual Coulomb repulsion?
A) The neutrons in the nucleus shield the protons from each other.
B) The gravity of the protons and neutrons overcomes their repulsion at such close distances.
C) There are an equal number of electrons in the nucleus which neutralize the protons.
D) The Coulomb force does not operate within nuclei.
E) An attractive nuclear force in the nucleus counteracts the effect of the Coulomb forces.
E
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Fluid Flow: A pump uses a piston of 15 cm diameter that moves at 2.0 cm/s as it pushes a fluid through a pipe. What is the speed of the fluid when it enters a portion of the pipe that is 3.0 mm in diameter? Treat the fluid as ideal and incompressible.
A. 50 m/s B. 50 cm/s C. 6.0 cm/s D. 22 cm/s
What actually produces the energy in the Sun?
A: Matter and anti-matter annihilation in the corona of the Sun B: A LOT of electricity occurring in the convection zone C: Mass of reacting elements is larger than that of the products (some converted to energy in the core) D: Gravitational collapse of the chromosphere E: A combination of all of the above
What is the total energy stored in the group of capacitors shown if the charge on the 30-?F capacitor is 0.90 mC?
a.
29 mJ
b.
61 mJ
c.
21 mJ
d.
66 mJ
e.
32 mJ
Because the Hubble constant has a value of 70 km/s/Mpc, a galaxy with a recession velocity of 21,000 km/s must be _______________ Mpc from Earth. (Express your answer as a whole number of Mpc)
Fill in the blank(s) with correct word