Which of the following explains why navigators a few hundred years ago found it much more difficult to determine their longitude than their latitude?
A) Determining longitude requires mathematical techniques that were not known at the time.
B) Determining longitude without modern instruments requires being able to see the Moon.
C) Determining longitude requires much more precise measurements of angles in the sky than does latitude.
D) Determining longitude requires having an accurate clock.
D
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The fact that many radio lobes emit more intensely from the side away from the galaxy suggests that
a. they are formed by material falling into the galaxy. b. they are powered by magnetic fields. c. they are excited by radiation from nearby galaxies. d. they are powered by the rapid rotation of the galaxy. e. they are created by jets from the galaxy emitting where the material is halted.
Starting from rest, a dragster travels a straight 1/4 mi racetrack in 6.70 s with constant acceleration. What is its velocity when it crosses the finish line?
A) 296 mi/h B) 135 mi/h C) 188 mi/h D) 269 mi/h
Objects A and B, of mass M and 2M respectively, are each pushed a distance d straight up an inclined plane by a force F parallel to the plane. The coefficient of kinetic friction between each mass and the plane has the same value mk. At the highest point,
a. KA = Fd = KB. b. KA = (F - mkMg cosq)d; KB = (F - 2mkMg cosq)d. c. KA = (F - Mg sinq)d; KB = (F - 2Mg sinq)d. d. KA = (F - Mg sinq - mkMg cosq)d; KB = (F - Mg sinq - mkMg cosq)d. e. KA = (F - Mg sinq - mkMg cosq)d; KB = (F - 2Mg sinq - 2mkMg cosq)d.
Of the following, which of the following is the largest object?
a. the Milky Way galaxy b. the Large Magellanic Cloud c. the Local Group d. the Andromeda galaxy