The Sun rotates slower near its poles than near its equator.
Answer the following statement true (T) or false (F)
True
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A conducting hollow cylinder (inner radius = a, outer radius = b) carries a current of 40 A that is uniformly distributed over the cross section of the conductor. If a = 3.0 mm and b = 6.0 mm, what is the magnitude of the (line) integral 
around a circular path (radius = 5.0 mm) centered on the axis of the cylinder and in a plane perpendicular to that axis?
A. 50 ?T ? m B. 30 ?T ? m C. 22 ?T ? m D. 37 ?T ? m E. 47 ?T ? m
How can astronomers measure the period of a planet's orbit?
A) by measuring the time between peaks in the star's velocity curve B) by timing the cycle of small changes in a stars position on the sky C) by measuring the time between repeated transits D) all of the above
In the terminology "a 500-N block", the "500-N" refers to the block's:
a. mass. c. weight. b. force. d. None of the above.
A glass flask has a volume of 500 mL at a temperature of 20° C. The flask contains 492 mL of mercury at an equilibrium temperature of 20°C
The temperature is raised until the mercury reaches the 500 mL reference mark. At what temperature does this occur? The coefficients of volume expansion of mercury and glass are 18 ×10-5 K-1 (mercury) and 2.0 ×10-5 K-1 (glass). A) 120°C B) 110°C C) 100°C D) 140°C E) 130°C