Based on its distance from the Sun and the amount of sunlight absorbed by its surface, calculations predict the global average temperature of the Earth would be
A) exactly the same as it is measured to be today
B) below the freezing point of water
C) above the boiling point of water
D) close to the freezing point of water
Question 2An optical fiber is 1.00 meter long and has a diameter of 20.0 m. Its ends are perpendicular to its axis. Its index of refraction is 1.30.
What is the minimum number of reflections a light ray entering one end will make before it emerges from the other end? A) 2.42 105
B) 2.56 105
C) 2.02 105
D) 1.85 105
E) 2.85 105
Question 3In the two-slit experiment, the distance between the slits and the screen is 1.1 m and the distance between the slits is 0.040 mm. If the first-order bright fringe is measured to be 3.4 cm from the centerline,
what is the distance between the adjacent bright fringes?
A) 1.7 cm
B) 5.1 cm
C) 7.0 cm
D) 6.8 cm
E) 3.4 cm
Question 4A wheel slows down uniformly and comes to rest in 15 seconds. It is rotating initially at 2.0 revolutions per second and has a diameter of 50.cm.
(a) What was the centripetal acceleration at the instant when it was rotating initially?
(b) What was the tangential acceleration?
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