A 0.20-km wide river has a uniform flow speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank. In what direction must the boat be pointed in order to accomplish this?
A. 23° west of north
B. 20° west of north
C. 24° west of north
D. 22° west of north
E. 17° west of north
Answer: D
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Find the uncertainty in the momentum (in kg × m/s) of an electron if the uncertainty in its position is equal to 3.4 × 10^-10 m, the circumference of the first Bohr orbit
a. 6.2 × 10^-25 b. 1.6 × 10^-25 c. 15.5 × 10^-25 d. 19.4 × 10^-25 e. 2.0 × 10^-24
In order to go from rest to 50 m/s in 10 s, a jet must be able to accelerate at
A. 20 m/s2. B. 2 m/s2. C. 5 m/s2. D. 50 m/s2.
An piece of space debris is released from rest at an altitude that is two earth radii from the center of the earth. Compared to its weight on Earth, the weight of this debris is
A) zero. B) one-quarter of its weight on the surface of the earth. C) the same as on the surface of the earth. D) one-half of its weight on the surface of the earth. E) one-third of its weight on the surface of the earth.
It is likely that both Pluto and Triton were originally ________
Fill in the blank(s) with correct word