It is late and Carlos is sliding down a rope from his third-floor window to meet his friend Juan. As he slides down the rope faster and faster, he becomes frightened and grabs harder on the rope, increasing the tension in the rope. As soon as the upward tension in the rope becomes equal to his weight:
a. Carlos will stop.
b. Carlos will slow down.
c. Carlos will continue down at a constant velocity.
d. the rope must break.
c
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The choices describe four hypothetical planets. Which one's surface would you expect to be most crowded with impact craters? (Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar system.)
A) Size: same as the Moon Distance from Sun: same as Mars Rotation rate: once every 10 days B) Size: twice as big as Earth Distance from Sun: same as Mercury Rotation rate: once every 6 months C) Size: same as Mars Distance from Sun: same as Earth Rotation rate: once every 18 hours D) Size: same as Venus Distance from Sun: same as Mars Rotation rate: once every 25 hours
Why is it thought that quasars probably spend only a fairly short time in their highly luminous phase?
A) because there aren't many quasars around today B) because there aren't any quasars closer than about a redshift of 1 C) because all quasars are at about the same epoch, narrowly defined in time D) because a black hole could not power a highly luminous quasar for more than a few million years E) because quasars are known to be the consumers of massive galaxies
How might you tell whether or not your toothpaste contained either calcium carbonate, CaC 03, or baking soda, NaHC 03, without looking at the ingredients label?
A) if the toothpaste bubbles when heated B) if the toothpaste bubbles when added to ammonia, such as window cleaner C) if the toothpaste produces a salt (NaCl) when added to HCl D) if the toothpaste bubbles when added to vinegar
A 50-kg child riding a Ferris wheel (radius = 10 m) travels in a vertical circle. The wheel completes one revolution every 10 s. What is the magnitude of the force on the child by the seat at the highest point on the circular path?
a. 0.29 kN b. 0.49 kN c. 0.69 kN d. 0.20 kN e. 0.40 kN