The 1 560 kg solid steel door to a bank vault is 2.00 m high, 1.00 m wide and 10 cm thick. One hinge is 60.0 cm down from the top on the left hand side of the door. The other hinge is 30.0 cm up from the bottom. What horizontal force, in what direction, does the door exert on the lower hinge?
a. 6 950 N, left
b. 6 950 N, right
c. 7 640 N, left
d. 7 640 N, right
e. 15 300 N, left
a
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The figure shows the displacement y of a traveling wave at a given position as a function of time and the displacement of the same wave at a given time as a function of position. How fast is the wave traveling?
A. 0.66 m/s
B. 0.75 m/s
C. 3.0 m/s
D. 2.0 m/s
E. 1.5 m/s
How did Edwin Hubble measure the distance to the Andromeda Galaxy?
A) He measured its parallax. B) He used Cepheid variables in the Andromeda Galaxy. C) He deduced it from its redshift. D) He used white dwarf supernovae in the Andromeda Galaxy.
A wooden ball is tied to the bottom of a swimming pool by a string. What is the tension in the string if the ball’s diameter is 0.15 m and its mass is 144 g? The water in the pool is fresh water, 1000
density.
A. 0.35 N B. 12.7 N C. 14.1 N D. 1.78 N
What is the leading hypothesis for Venus’s lack of water?
A. Venus formed closer to the Sun and accreted very little water. B. Its water is locked away in the crust. C. Its water molecules were broken apart, and hydrogen was lost to space.