Suppose we carefully synchronize two identical atomic clocks initially standing next to each other (call them A and B). We put clock B on a jet plane, which then flies around the world at an essentially constant speed of 300 m/s, returning 134,000 s (37.1 h) later. We then again compare the two clocks. Assume the earth’s surface defines an inertial reference frame, and ignore the possible effects of gravity. Which clock measures the space time interval between the synchronization and comparison events?
A. Clock A
B. Clock B
C. Both
D. Neither
A. Clock A
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When dark matter was first discovered, some astronomers thought that ?o was greater than one from the extra gravity, favoring what type of universe?
What will be an ideal response?
A brass rod with a length of 10.0 cm is placed end to end with an aluminum rod with a length of 30.0 cm and this system is placed between a hot temperature of 100
and a cold temperature of 10.0
The coefficient of thermal conductivities of the brass and the aluminum are 100 W/m C and 230 W/m
respectively. The rods have the same cross sectional area of 20.0 cm2. What is the heat flow from the hot temperature to the cold temperature?
A. 55.3 W B. 65.3 W C. 70.3 W D. 78.1 W E. 85.3 W
According to Lenz’s Law the direction of the induced current produced by a changing magnetic flux is such as to produce a magnetic field that
A. reinforces the change in the original magnetic flux. B. opposes the change in the original magnetic flux.
Carbon fusion occur in high-mass stars but not in low-mass stars because ________
A) carbon fusion can occur only in the stars known as carbon stars B) the cores of low-mass stars never contain significant amounts of carbon C) only high-mass stars do fusion by the CNO cycle D) the cores of low-mass stars never get hot enough for carbon fusion