During a hockey game, a puck is given an initial speed of 10 m/s. It slides 50 m on the horizontal ice before it stops due to friction. What is the coefficient of kinetic friction between the puck and the ice?
A) 0.090
B) 0.10
C) 0.11
D) 0.12
B
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A car travels around an unbanked highway curve (radius 0.15 km) at a constant speed of 25 m/s. What is the magnitude of the resultant force acting on the driver, who weighs 0.80 kN?
a. 0.87 kN b. 0.34 kN c. 0.80 kN d. 0.00 kN e. 0.67 kN
What evidence do we have that the surface of Mars has never divided into moving plates?
What will be an ideal response?
The distribution of the dark matter in a spiral galaxy is
A) flattened in a disk but about ten times larger than the stellar disk. B) flattened in a disk and about the same size as the stellar disk. C) approximately spherical and about ten times the size of the galaxy halo. D) predominantly concentrated in the spiral arms. E) approximately spherical and about the same size as the galaxy halo.
Compare and contrast latitude and declination. How does each relate to your position on Earth?
What will be an ideal response?