A charged particle that is moving in a static uniform magnetic field
A) will always experience a magnetic force, regardless of its direction of motion.
B) may experience a magnetic force which will cause its speed to change.
C) may experience a magnetic force, but its speed will not change.
D) may experience a magnetic force, but its direction of motion will not change.
E) None of the above statements are true.
C
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A 50.0-kg block is being pushed up a 15.0° slope by a force of 300 N which is directed 30.0° below the slope. The coefficient of kinetic friction between the block and the slope is 0.200. What is the acceleration of the block?
A) 0.164 m/s2 B) 0.967 m/s2 C) 1.20 m/s2 D) 2.20 m/s2 E) 0.528 m/s2
Two ropes are attached to a 50-kg object. The first rope applies a force of 35 N and the second, 55 N. If the two ropes are perpendicular to each other, what is the resultant acceleration of the object?
a. 1.3 m/s2 b. 35 m/s2 c. 1.8 m/s2 d. 65 m/s2 e. 0.77 m/s2
The total number of galaxies in our observable universe is
A) about ten million B) about a hundred billion C) infinite D) a few trillion
Kepler's Impact: In four years of operation, the Kepler satellite discovered nearly three times as many extrasolar planet candidates as had been discovered in the previous 15 years (since the first discovery of an extrasolar planet)
Discuss how these observations changed our understanding of the population of planets and of planet formation.