A heavy box is located in the center of the cargo hold of a train. There are no other boxes or items in the cargo hold and there are no straps holding the box down. The train accelerates along the track in the northward direction. The direction of the friction force exerted by the floor of the cargo hold on the box is
1.upward.
2.none; no friction force exists because the box is not sliding.
3.to the north.
4.to the south.
3
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A rocket, initially at rest, is fired vertically with an upward acceleration of 10 m/s2 . At an altitude of 0.50 km, the engine of the rocket cuts off. What is the maximum altitude it achieves?
a. 1.9 km b. 1.3 km c. 1.6 km d. 1.0 km e. 2.1 km
Based solely on an understanding of the greenhouse effect (as displayed in the figure), which one of the following statements is true?
a. We do not yet understand the greenhouse effect well enough to make predictions about how it affects our planet. b. Global warming poses a grave threat to our future. c. We should expect an increase in the greenhouse gas concentration to lead to global warming. d. Humans are causing global warming.
Which of these technological advances would make it harder for extraterrestrial life to find us?
A) FM radio B) color television C) the Global Positioning Satellite Network D) cable TV E) geosynchronous satellites
In addition to the proper chemistry, it is ________ that determines the feasibility of life on a given planet
Fill in the blank(s) with correct word