A jet plane travels around the world at 2000 mi/hr (894 m/s). Two accurate atomic clocks measure the times of flight, one on board the plane and the second on Earth. If it takes 12 hours to complete the journey, what will the time difference (in ?s) be?
a. 0.75
b. 0.50
c. 0.25
d. 1.0
e. 0.19
e
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Of these, which is evidence that Mars once had running water on its surface?
A. There are vast amounts of H2O present in Martian rocks. B. Spacecraft have observed channels and dry riverbeds on the Martian surface. C. There is a medium-sized ocean in the Southern Hemisphere of Mars. D. There is no such evidence.
________ major contribution to astronomy is his extensive series of measurements of planetary positions.
A. Kepler's B. Copernicus's C. Galileo's D. Tycho Brahe's
Arrange the atoms calcium, barium, chlorine, and bromine in order of increasing atomic radius
To find the equivalent resistance of the combination of resistors shown below by the method of possibly repeated applications of combining resistors in series and /or combining resistors in parallel, the first step would be which of the following?
a.
Combine the 6.0 ? and the 7.0 ? in series.
b.
Combine either the 4.0 ? and the 10.0 ? in parallel or the 7.0 ? and the 10.0 ? in parallel first, since either could be the first step with the other the second step.
c.
Combine the 4.0 ? and the 10.0 ? in series.
d.
Combine the 6.0 ?, the 4.0 ?, and the 10.0 ? in series in a single step.