A 60. gram toy rocket achieves a speed of 80. m/s after 3.0 s, when fired straight up. What is the average total force on the rocket during the 3 s?
A) 3.4 N
B) 1.6 N
C) 2.2 N
D) 3.2 N
E) 1.2 N
B
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The magnitude scale
a. originated just after the telescope was invented. b. can be used to indicate the apparent intensity of a celestial object. c. was devised by Galileo. d. is no longer used today. e. was used to determine the rate of precession.
Which Jovian moon shows the most diverse terrain, suggesting a violent impact broke it into many pieces, some of which reformed it as a jumbled puzzle?
A) Ganymede B) Triton C) Io D) Enceladus E) Miranda
Suppose that a certain atom possesses only four distinct energy levels. Assuming that all transitions between levels are possible, how many spectral lines will this atom exhibit?
A) three B) four C) six D) unlimited
The Tertiary is a(n)
a. epoch. b. era. c. eon. d. period.