Two charged bodies separated by a distance d exert an attractive electrical force on each other. The signs of the charges on the two bodies are __________ and __________
Fill in the blank(s) with correct word
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Describe how gravitational lensing works. What can it tell us about a quasar? What can it tell us about the galaxy that is doing the lensing? How is lensing valuable to the study of dark matter?
What will be an ideal response?
According to the nuclear energy curve, would fusion or fission or neither release nuclear energy from gold [atomic number 79], and why?
A) Fission, because then the reaction products have higher atomic numbers and thus a higher nuclear energy. B) Fusion, because then the reaction product has a higher atomic number and thus a lower nuclear energy. C) Fission, because then the reaction products have lower atomic numbers and thus a lower nuclear energy. D) Neither, because all other elements have higher nuclear energies than carbon. E) Fusion, because then the reaction product has a lower atomic number and thus a higher nuclear energy.
The Earth is 1.49 × 10^11 meters from the Sun. If the solar radiation at the top of the Earth's atmosphere is 1340 W/m2, what is the total power output of the Sun?
a. 7.10 × 10^27 W b. 2.20 × 10^30 W c. 6.62 × 10^26 W d. 3.74 × 10^26 W e. 2.98 × 10^25 W
In one-dimensional motion, the average speed of an object that moves from one place to another and then back to its original place has which of the following properties?
a. It is positive. c. It is zero. b. It is negative. d. It can be positive, negative, or zero.