In Problem 4.7, the force in truss member BG is:
(A) 20.83P
(B) 0.83P
(C) 1.24P
(D) 2.08P
(B) 0.83P
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Projectile Motion: A plane flying horizontally at a speed of 50 m/s and at an elevation of 160 m drops a package, and 2.0 s later it drops a second package. How far apart will the two packages land on the ground if air resistance is negligible?
A. 100 m B. 160 m C. 180 m D. 320 m
When using different points in the Earth's orbit as a baseline for a parallax experiment it is best to do the observations:
A. 1 day apart. B. 6 months apart. C. 1 month apart. D. 1 year apart. E. 2 years apart.
Although it hasn't been observed (yet), why do astronomers think that the Milky Way may contain "dark" material?
A. Due to its large size, the light from stars on the other side of the Milky Way has not reached us yet. B. Astronomers have detected neutrinos from unseen sources. C. Theory predicts that there should be more black holes than we've so far detected. D. The Galaxy's gravity seems too big for the mass astronomers can see.
The national debt is measured in trillions of dollars. Which of the following is a representation of a trillion?
A) 1 × 1015 B) 1 × 1012 C) 1 × 109 D) 1 × 106 E) 1 × 103