A large number of seeds are observed, and their initial launch angles are recorded. The range of projection angles is found to be −51° to 75°, with a mean of 31°. Approximately 65% of the seeds arc launched between 6° and 56°. (See W. J. Garrison et al, “Ballistic seed projection in two herbaceous species,” Amer. J. Bot ., Sept. 2000, 87:9, 1257–64.) Which of these hypotheses is best supported by the data? Seeds are preferentially launched (a) at angles that maximize the height they travel above the plant; (b) at angles below the horizontal in order to drive the seeds into the ground with more force; (c) at angles that maximize the horizontal distance the seeds travel from the plant; (d) at angles that minimize the time the seeds spend exposed to the air.
A large number of seeds are observed, and their initial launch angles are recorded. The range of projection angles is found to be −51° to 75°, with a mean of 31°. Approximately 65% of the seeds arc launched between 6° and 56°. (See W. J. Garrison et al, “Ballistic seed projection in two herbaceous species,” Amer. J. Bot ., Sept. 2000, 87:9, 1257–64.) Which of these hypotheses is best supported by the data? Seeds are preferentially launched (a) at angles that maximize the height they travel above the plant; (b) at angles below the horizontal in order to drive the seeds into the ground with more force; (c) at angles that maximize the horizontal distance the seeds travel from the plant; (d) at angles that minimize the time the seeds spend exposed to the air.
A large number of seeds are observed, and their initial launch angles are recorded. The range of projection angles is found to be −51° to 75°, with a mean of 31°. Approximately 65% of the seeds arc launched between 6° and 56°. (See W. J. Garrison et al, “Ballistic seed projection in two herbaceous species,” Amer. J. Bot., Sept. 2000, 87:9, 1257–64.) Which of these hypotheses is best supported by the data? Seeds are preferentially launched
(a) at angles that maximize the height they travel above the plant; (b) at angles below the horizontal in order to drive the seeds into the ground with more force; (c) at angles that maximize the horizontal distance the seeds travel from the plant; (d) at angles that minimize the time the seeds spend exposed to the air.
The figure shows the path taken by a drunk skunk over level ground, from initial point i ta final point f. The angles are 0, - 31.0,
0, - 46.0, and 0, - 84,0, and the distances ared, - 5.20 m, d, - 7.10 m, and dy - 12.0 m. What are the (a) magnitude and (b) angle of
the skunk's displacerment fromi to f? Give the angle as a pusitive (cuunterckockwise) ur nugative (clotkwise) angle of magnitude less
than 180', measured from the +xdlirection.
(a) Number
Units
(b) Number
Unils
The figure shows the path taken by a drunk skunk over level ground, from initial point i to final point f. The angles are 0, - 32.0°,
e2 = 49.0°, and e3 = 84.0°, and the distances are d= 4.80 m, d2 = 7.30 m, and d3 = 10.0 m. What are the (a) magnitude and (b) angle of
the skunk's displacement from i to f? Give the angle as a positive (counterclockwise) or negative (clockwise) angle of magnitude less
than 180°, measured from the +x direction.
dy
dg
(a) Number
9.853
Units
(b) Number
-123.8
Units
(degrees)
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