A flatbed truck is carrying a 20.0-kg crate along a level road. The coefficient of static friction between the crate and the bed is 0.400. What is the maximum acceleration that the truck can have if the crate is to stay in place?
A) 3.92 m/s2
B) 7.84 m/s2
C) 8.00 m/s2
D) 78.5 m/s2
E) 196 m/s2
A
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The reason that some bright objects appearing in photographs of distant objects in the night sky appear to be blurry is that
A. they are really nearby objects that can appear to move relative to distant and dimmer objects much further away. B. they would really look blurry even if you were right next to them. C. they are really other galaxies, collections of billions of stars. D. they are exploding supernovae very near to the Earth.
Which of the following statements is probably true about the very first stars in the universe?
A) They were made only from hydrogen and helium. B) They were made from pure energy. C) They were probably orbited only by terrestrial planets, but no jovian planets. D) They were made approximately of 98% hydrogen and helium, and 2% of heavier elements.
The formation of the supercontinent of Pangaea
A) resulted from the collision of all major land masses. B) produced widespread mountain building in the Himalayas. C) resulted in extensive volcanic activity and flood basalts. D) all of these
Exhibit 5-2
A 4.00-kg block is suspended from the roof of an elevator. A 2.00-kg block is suspended from the 4.00-kg block. The tensions in strings 1 and 2 are labeled 
and 
.
?
?
Use this exhibit to answer the following question(s).
Refer to . When the elevator accelerates upwards with an acceleration of 2.20 m/s2, the magnitudes of 
and 
are
A. 30.4 N; 15.2 N.
B. 39.2 N; 19.6 N.
C. 45.6 N; 15.2 N.
D. 48.0 N; 24.0 N.
E. 72.0 N; 24.0 N.