Consider the same scenario as in the previous problem: Two twin sisters, Gwen and Jackie, are both 20 years old in the year 2020. Jackie takes off on a round-trip to Vega, 25 light-years away. She travels at an average speed of 0.9999c
Which of the following best describes the situation according to Jackie? A) She stays still, while Earth rushes away from her at 0.9999c and Vega rushes toward her at 0.9999c. Since Vega is 25 light-years away, she says it takes Vega about 25 years to reach her.
B) She says that the 25 light-year trip takes only a few months, and therefore concludes that she is traveling faster than the speed of light.
C) It takes her 25 years to reach Vega.
D) She stays still, while Earth rushes away from her at 0.9999c and Vega rushes toward her at 0.9999c. She sees the distance from Earth to Vega shortened considerably from 25 light-years, and therefore it takes far less than 25 years for Vega to reach her.
D
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Which of the following best describes the current status of the evidence concerning whether life has ever existed on Mars?
A) Mars probably once had a habitable surface, but we do not know if it had life. B) Clear evidence strongly suggests that life once existed on Mars. C) Clear evidence indicates that Mars never had conditions favorable to life. D) Although current evidence is mixed, ongoing studies should ensure that we will have a definitive answer to the question of whether life ever existed on Mars within about five years.
Venus can appear as a crescent through the telescope
Indicate whether the statement is true or false
4.00 kg mass is connected to a spring with a spring constant of 9.00 N/m. The velocity is given by the expression v(t) = 8.00 cm/s sin
What is the maximum velocity of the simple harmonic motion?
A. 41.0 cm/s B. 32.8 cm/s C. 24.5 cm/s D. 20.5 cm/s E. 12.8 cm/s
This figure shows the motions of atoms (a) in a falling ball and (b) after the ball hits the ground. Why would you not expect the ball on the ground to suddenly move upward?
a. Because it is exceedingly unlikely that the velocities of the atoms would simultaneously reorder themselves to generally point upward. b. It would violate the first law of thermodynamics. c. Both a. and b.