Which of the following explains why navigators prior to a few hundred years ago found it much more difficult to determine longitude than latitude?
A) Determining longitude requires an accurate clock, but latitude does not.
B) Determining longitude requires mathematical techniques that were not known at the time.
C) Determining longitude requires much more precise measurements of angles in the sky than does latitude.
D) Determining longitude requires accurate tables of the celestial coordinates of stars, while determining latitude does not.
A) Determining longitude requires an accurate clock, but latitude does not.
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A 4.00 kg ball is moving at 3.00 m/s to the NORTH and a 5.00 kg ball is moving at 2.00 m/s to the NORTHWEST. The total momentum of the system is
A. 20.3 kg m/s at an angle of 89.7 degrees NORTH of EAST. B. 20.3 kg m/s at an angle of 24.6 degrees SOUTH of EAST. C. 26.1 kg m/s at an angle of 24.6 degrees NORTH of EAST. D. 26.1 kg m/s at an angle of 89.7 degrees SOUTH of EAST. E. 43.00 kg m/s at an angle of 45.0 degrees NORTH of EAST.
Together, which two gases make up 99% of Jupiter's atmosphere?
A) Ammonia and Methane B) Water Vapor and Methane C) Helium and Ammonia D) Hydrogen and Ammonia E) Hydrogen and Helium
A temperature difference of 9.0 Celsius degrees is equal to a Fahrenheit temperature difference of
A. 5.0 Fahrenheit degrees. B. 9.0 Fahrenheit degrees. C. 16 Fahrenheit degrees. D. 37 Fahrenheit degrees. E. 41 Fahrenheit degrees.
With the x axis horizontal and the y axis vertically upward, the change in the horizontal component of velocity, ?vx, and the change in the vertical component of velocity, ?vy, of a projectile are related to the time since leaving the barrel, ?t, as
A. ?vx = 0; ?vy = 0. B. ?vx = g?t; ?vy = 0. C. ?vx = 0; ?vy = g?t. D. ?vx = 0; ?vy = ?g?t. E. ?vx = g?t; ?vy = ?g?t.