It's cold! You are sitting on what appears to be an ice-covered world (water ice). The Sun is low on the horizon and circles the horizon about once every 24 hours
Despite the low Sun, you can almost "feel" the skin cancers appearing on your exposed face (because there is little ozone to protect you). Despite these discomforts, you are pleased to find that the air is quite satisfactory; oxygen seems plentiful, and you are able to breathe even without the life-support belt.
You have returned to Earth, in the Antarctic spring. (The ozone hole appears during the spring.)
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Explain why we observe distant galaxies to be moving away from us and therefore believe that the universe is expanding, but we don't see individual galaxies or clusters expanding
What will be an ideal response?
The magnetic field at a distance of 2 cm from a current carrying wire is 4 ?T. What is the magnetic field at a distance of 4 cm from the wire?
A) 1/2 µT B) 1 µT C) 2 µT D) 4 µT E) 8 µT
How do the motions of the Sun and planets reflect the disk shape of the solar nebula?
What will be an ideal response?
The pressure inside a commercial airliner is maintained at 1 atm (1.01 × 10^5 N/m2). What is the outward force exerted on a 1.0 m × 2.0 m cabin door if the outside pressure (at 10-km height) is 0.3 atm?
a. 1.4 × 10^2 N b. 1.4 × 10^3 N c. 1.4 × 10^4 N d. 1.4 × 10^5 N e. 7.0 × 10^3 N