What is the definition of a star's habitable zone?
A) the range of distances from the star where planets with life have been detected
B) the range of distances from the star where rocky planets can form
C) the range of distances from the star where organic molecules can be stable on the surface of a suitable planet
D) the range of distances from the star where liquid water can be stable on the surface of a suitable planet
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.
In an isolated system of two bodies that exert gravitational forces on one another, the quantity (quantities) that remain(s) constant is(are)
a. the total energy of the system. b. the total angular momentum of the system. c. the angular positions of the two bodies. d. all of the above. e. only (a) and (b) above.
The potential difference between the plates of a parallel plate capacitor is 4.00 V. If the plate separation for this capacitor is 6.00 cm, what is the intensity of the electric field between the plates of this capacitor?
What will be an ideal response?
The acceleration of an object as a function of time is given by a(t) = (3.00 m/s3)t. If the object has a velocity 1.00 m/s at time t = 1.00 s, what is the displacement of the object between time t = 2.00 s and time t = 4.00 s?
A) 33.0 m B) 30.0 m C) 36.0 m D) 27.0 m E) Not enough information is given to determine the displacement of the object between these two times.