Study this diagram that summarizes the eras of the universe. Which of the following statements is not true?
A) The electroweak era was the longest lasting of all the eras in the history of the universe.
B) The total time during which the universe went through the Planck era, GUT era, electroweak era, and particle era was less than the time it takes you to blink your eyes.
C) Whole atoms with both electrons and nuclei were not stable until the universe was about 380,000 years old.
D) Most of the helium in the universe was produced before the universe was about five minutes old.
A) The electroweak era was the longest lasting of all the eras in the history of the universe.
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A chunk of ice (T = -20°C) is added to a thermally insulated container of cold water (T = 0°C). What happens in the container?
A) The ice melts until thermal equilibrium is established. B) The water cools down until thermal equilibrium is established. C) Some of the water freezes and the chunk of ice gets larger. D) None of the above things happen.
Which of the following has been the most important for maintaining the Earth's stable climate over the time it took for large organisms to evolve?
A) impacts of water-bearing planetesimals B) the ending of the heavy bombardment C) plate tectonics D) the tides E) deep sea volcanic vents
A 3.0-kg block is on a frictionless horizontal surface. The block is at rest when, at t = 0, a force (magnitude P = 2.0 N) acting at an angle of 22° above the horizontal is applied to the block. At what rate is the force P doing work at t = 2.0 s?
a. 2.3 W b. 2.0 W c. 1.4 W d. 1.7 W e. 1.2 W
In an isotropic material subject to a hydrostatic stress, the volumetric strain is equal to _____________times the strain in the x direction.
Fill in the blank(s) with the appropriate word(s).