Wall posters are usually sold curled up in cylindrical cardboard tubes. If the length of the tube is 84.5 cm, and the diameter of the tube is 2.40 cm, what is the area of the poster, in cm2? (Assume the poster doesn't overlap itself.)
A) 1529 cm2
B) 203 cm2
C) 637 cm2
D) 382 cm2
E) 605 cm2
C
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An Earth observer sees a spaceship at an altitude of 920 m moving downward toward the Earth at a speed of 0.690c. What is the spaceship's altitude as measured by an observer in the spaceship?
a. 1270 m b. 512 m c. 1650 m d. 666 m e. 635 m
A 200-W light bulb is connected across a 110-V dc power supply. What is the current through this bulb?
A) 0.90 A B) 0.36 A C) 0 A D) 0.60 A E) 1.8 A
From the point of view of an observer on the earth, a muon produced high in the atmosphere can reach the ground before decaying because
a. relativity gives it extra time to get there b. of the uncertainty principle c. it is a short distance to the ground d. relativity shortens the distance to the ground
a protostar evolves by contracting and condensing in order to become?
What will be an ideal response?