As the Sun rotates, an individual sunspot can be tracked across its face. From eastern to western limb, this takes about
A) 12 hours.
B) a week.
C) two weeks.
D) a month.
E) 5.5 years.
C
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You are packing for a trip to another star, and on your journey you will be traveling at a speed of 0.99c. Can you sleep in a smaller cabin than usual, because you will be shorter when you lie down? Explain your answer
1.No; from your perspective you’re at rest with respect to the cabin, so you will measure yourself as having your normal length, and will require a normal-sized cabin. 2.Yes, if your bed is oriented along the direction of motion, because length contraction only takes place along this direction.
1.76m tall man looks at his reflection in a plane mirror. He stands 4.2m away from the window. How far from his eyes are the images of his feet? Assume his eyes are 5cm below the top of his head.
A. 8.4m B. 11.1m C. 4.2m D. 4.53m
Calculate (0.82 + 0.042) × (4.49 × 10^3), keeping only significant figures
a. 3870.8 c. 3879 b. 3870 d. 3900
The area under a graph of vx vs. t from t = ti to t = tf represents
A.
B.
C.
D.
(xi + xf).E.