Which of the following phases of the Moon is most easily seen during the daytime (mid-morning or mid-afternoon, not near sunrise or sunset)?
What will be an ideal response?
quarter
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An isolated air-filled parallel-plate capacitor that is no longer connected to anything has been charged up to Q = 2.9 nC. The separation between the plates initially is 1.20 mm, and for this separation the capacitance is 31 pF
Calculate the work that must be done to pull the plates apart until their separation becomes 5.30 mm, if the charge on the plates remains constant. (?0 = 8.85 × 10-12 C2/N • m2 )
Which of the following is the correct electron dot structure for carbon (atomic no. = 6)?
A) a B) b C) c D) d E) e
If a lamp has resistance of 120 W when it operates at 200 W, what is the applied voltage?
a. 120 V c. 110 V b. 220 V d. 155 V
The first step in the proton-proton chain produces an antielectron, or positron. What happens to the positron?
A) It slowly works its way to the Sun's surface, where it escapes into space. B) It rapidly escapes from the Sun, traveling into space at nearly the speed of light. C) It is rapidly converted to energy when it meets an ordinary electron, resulting in matter-antimatter annihilation. D) It quickly meets an ordinary electron, forming an electron-positron pair that remains stable. E) It joins with a nearby neutron to form a proton.