At what speed will a car round a 52.0-m-radius curve, banked at a 40.0° angle, if no friction is required between the road and tires to prevent the car from slipping? (g = 9.80 m/s2)
a. 18.1 m/s
b. 22.6 m/s
c. 20.7 m/s
d. 43.6 m/s
c
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Equilibrium: Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal 100-N pull, as shown in the figure. Both of them are moving together at a constant velocity of 2.0 m/s to the right, and both weigh the same. 
Which of the figures below shows a correct free-body diagram of the horizontal forces acting on the lower block, B?
A. 
B. 
C. 
D. 
E. None of these diagrams is correct.
A cube is subjected to a pressure of 10.0 atmospheres. The un-squeezed length of one side of the cube is 1.20 cm. The squeezed length of one side of the cube is 1.18 cm. The bulk strain on the cube is
A. 0.0362. B. 0.0492. C. 0.0534. D. 0.0598. E. 0.0645.
In attempting to find the missing matter that seems to be required to explain observed properties of galaxies and clusters, astronomers have been able to rule out which populations?
A. weakly interacting massive particles B. hot and cold gas C. black holes D. dead white dwarfs
Kepler’s Third Law relates
• •(a) density and pressure •(b) period and semi-major axis •(c) semi-major axis and orbital velocity •(d) period and orbital velocity