A particle (q = ?4.0 ?C, m = 5.0 mg) moves in a uniform magnetic field with a velocity having a magnitude of 2.0 km/s and a direction that is 50° away from that of the magnetic field. The particle is observed to have an acceleration with a magnitude of 5.8 m/s2 . What is the magnitude of the magnetic field?
a. 5.3 mT
b. 4.9 mT
c. 5.1 mT
d. 4.7 mT
e. 3.6 mT
d
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Again consider two twin sisters, Gwen and Jackie, who are both 20 years old in the year 2020. This time, assume that Jackie makes the round-trip to Vega, which is 25 light-years away, at an average speed of 0.9999c
Which of the following correctly describes the situation when Jackie returns to Earth? (Ages in this problem refer to biological ages—that is, how much time has passed for each sister since she was born.) A) It's the year 2070. Gwen (who stayed home) is 70 years old, but Jackie is only a little older than her age of 20 when she left. B) It's the year 2070 and both twin sisters are 70 years old. C) It's the year 2070. Gwen is 70 years old. Jackie is 19. D) According to Gwen, Jackie returns to Earth in the year 2070, but according to Jackie, she returns in the year 2021.
How would Jupiter be different if it rotated slowly?
What will be an ideal response?
If a feather and a brick are both dropped from the same height at the same time in the classroom
A. both experience the same acceleration due to gravity B. the net acceleration of both is the same C. the net acceleration of the feather is greater © 2019 McGraw-Hill Education
A boy on a skate board skates off a horizontal bench at a velocity of 10 m/s. One tenth of a second after he leaves the bench, to two significant figures, the magnitudes of his velocity and acceleration are:
A. 10 m/s; 9.8 m/s2. B. 9.0 m/s; 9.8 m/s2. C. 9.0 m/s; 9.0 m/s2. D. 1.0 m/s; 9.0 m/s2. E. 1.0 m/s; 9.8 m/s2.