In 1998 came the discovery of ________, which seems to overwhelm even gravity and all the dark matter in the final fate of the cosmos
Fill in the blank(s) with correct word
dark energy
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Which are places on Earth where convection is operating on a grand scale, creating conditions important to life on Earth?
A) in the mantle B) in hot springs like Old Faithful C) in the troposphere, such as a summer thunderstorm D) at the thermal vents in the rift valleys E) All of the above are good examples.
Which type of reaction is 2Cu(NO3)2? 2CuO + 4NO2 + O2?
a. Single-replacement b. Double-replacement c. Combination d. Decomposition
Which of the following best describes the current scientific view of possibilities of travel to distant parts of our galaxy (or universe) with such things as hyperspace, wormholes, or warp drive?
A) We do not know if travel in any of these ways is really possible, but they do not contradict any known laws of physics. B) There is no doubt that such travel is possible, though it remains well beyond our current technology. C) They sound like fun, but they are not possible because they allow faster-than-light travel. D) They seemed to be allowed by special relativity, but general relativity does not allow for them.
The electric field in a cathode ray tube is supposed to accelerate electrons from 0 to 1.60 × 10^7 m/s in a distance of 4.00 cm. What electric field is required? (me = 9.11 × 10^-31 kg and e = 1.60 × 10^-19 C)
a. 18,200 N/C c. 36,400 N/C b. 9110 N/C d. 72,800 N/C