Make a prediction: If the rise in carbon dioxide concentration continues at its current pace, the concentration in the year 2050 will be about _____ parts per million.
A. 400
B. 430
C. 460
D. 510
Answer: C. 460
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When a massive star begins to run out of hydrogen to fuse, its outer layers of gas ________.
A. expand and cool B. contract and heat C. contract and cool D. expand and heat
A load is being lifted by means of two cables attached to it. The first cable exerts a force of 600 N at an angle of 35° to the left of the vertical. The second cable exerts a force of 1300 N
If the load is accelerating vertically, at what angle to the right of the vertical is the second cable pulling? A) 15.4° B) 16.2° C) 30.8° D) 67.8° E) 75.8°
At present, the formation of the solar system is believed by most astronomers to have begun with a large, swirling volume of cold gas and dust called the ______________ nebula
a. condensation b. primordial c. accretion d. celestial
When a bar magnet is thrust at the same speed into a coil having twice the number of loops, the induced voltage is
A) half. B) the same, no different. C) twice as much. D) four times as much. E) none of the above