What is the energy needed to change an He+ ion into an He++ ion? (The ionization energy of hydrogen is 13.6 eV)
a. 13.6 eV
b. 54.4 eV
c. 92.9 eV
d. 112.4 eV
b
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The gravitational force between two objects can be described using the equation Fg = G M1 M2 / d2. According to this equation, if the distance between two objects increases, what happens to the gravitational force between them?
A) The force increases. B) The force decreases. C) The force drops instantly to zero. D) The gravitational force is not affected by distance.
What is a quark?
A. a burst of radiation seen near black holes B. a very short wavelength radiation emitted by active galaxies C. a remote active galaxy D. a kind of subatomic particle that protons and neutrons are composed of E. None of these choices is correct.
There are no environmental drawbacks to wind energy
What will be an ideal response?
The U-tube shown is rotated about the left vertical leg at 100 rpm. The highest pressure in the U-tube is nearest:
(A) 5.6 kPa
(B) 4.2 kPa
(C) 2.2 kPa
(D) 0.8 kPa