A 2 000-kg sailboat experiences an eastward force of 4 500 N by the ocean tide and a wind force against its sails with magnitude of 1 500 N directed toward the northwest (45° N of W). What is the direction of the resultant acceleration?
a. 27° N of W
b. 58° N of W
c. 27° N of E
d. 17° N of W
e. 17° N of E
e
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From a fracture mechanics viewpoint, the reason freshly drawn glass fibers are stronger than window glass is that window glass has _________ that decrease its strength.
Fill in the blank(s) with the appropriate word(s).
Radio maps of our galaxy show spiral arms because
a. the arms have larger Doppler shifts. b. the gas in the spiral arms is very hot. c. the dust in spiral arms is denser. d. the gas in spiral arms is denser. e. the stars in the spiral arms emit most of their energy at radio wavelengths.
The maximum value of the magnetic field component of an electromagnetic wave is 2.81 ?T. What is the rms value of the magnetic field?
A) 2.81 ?T B) 2.46 ?T C) 3.12 ?T D) 3.97 ?T E) 1.99 ?T
As a radio source, the period of "pulsar Earth" is
A) 30 minutes. B) 23 hours, 56 minutes. C) 24 hours. D) 29.5 days. E) 365.25 days.