Which of the following statements best describes the current state of understanding regarding the apparent acceleration of the expansion of the universe?
A) The cause of the acceleration is well-understood, and attributed to the particles that make up dark energy.
B) The acceleration is very important in the cosmos today, but the evidence indicates that it will eventually slow down, allowing the universe to recollapse.
C) The acceleration probably is not real, and what we attribute to acceleration is probably just a misinterpretation of the data.
D) We have moderately strong evidence that the acceleration is real, but essentially no idea what is causing it.
D
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Is the actual size of the universe larger than 14 billion light years?
A) The observable universe is 14 billion light years in each direction, so the actual universe is greater than 14 billion light years across. B) We do not have enough information to know this. C) The universe must be exactly equal in size to its age, so it must not be larger than 14 billion light years across in size. D) It is only 14 billion light years across to us; to an observer 10 billion light years away, it is smaller.
Organisms that are found living kilometers beneath Earth's crust are referred to as
A) asthenophiles B) magmaphiles C) sublithophiles D) endoliths
A ball rolls over the edge of a table with a horizontal velocity v m/s. The height of the table is 1.6 m and the horizontal range of the ball from the base of the table is 20 m. What is the initial speed of the ball?
A) 9.8 m/s B) 20 m/s C) 35 m/s D) 4.9 m/s E) 70 m/s
How much heat energy is required to vaporize a 4.40-g ice cube at 0°C? The heat of fusion of ice is 80.0 cal/g. The heat of vaporization of water is 540 cal/g, and cwater = 1.00 cal/g/°C
a. 2 730 cal b. 3 170 cal c. 2 820 cal d. 3 520 cal e. 2 380 cal