A uniformly charged rod (length = 2.0 m, charge per unit length = 3.0 nC/m) is bent to form a semicircle. What is the magnitude of the electric field at the center of the circle?
a. 64 N/C
b. 133 N/C
c. 48 N/C
d. 85 N/C
e. 34 N/C
d
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Four of the five answers listed below are aspects of the scientific method. Select the exception
a. observation b. hypothesis c. experimentation d. philosophy e. conclusion
A set of ten minerals used as reference standards in determining hardness is called the______________ hardness scale
Fill in the blank(s) with correct word
Does Hubble's law work well for galaxies in the Local Group? Why or why not?
A) Yes, it works so well that we have never detected any measurable deviations from its predictions. B) No, because galaxies in the Local Group are gravitationally bound together. C) No, because we do not know the precise value of Hubble's constant. D) No, because Hubble did not know the Local Group existed when he discovered his law.
When a hydrogen atom absorbs a photon that raises it to the n = 5 state, how many different energies are possible for the photon(s) that may be emitted as the atom eventually returns to the ground state?
a. 4 b. 5 c. 6 d. 10 e. The correct answer is not given.