Betelgeuse is the bright red star representing the left shoulder of the constellation Orion. All the following statements about Betelgeuse are true. Which one can you infer from its red color?
A) It is moving away from us.
B) Its surface is cooler than the surface of the Sun.
C) It is much more massive than the Sun.
D) It is much brighter than the Sun.
B) Its surface is cooler than the surface of the Sun.
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Beyond the frost line of the solar system, temperatures were low enough for
A) metals to condense into solid form. B) rocks to condense into solid form. C) hydrogen compounds to condense into solid ices. D) asteroids to form. E) hydrogen and helium to condense into ice.
What is the difference between speed, velocity, and instantaneous velocity? Give examples of each
What will be an ideal response?
A balloon of negligible mass is filled with 300 m3 of helium. How big a payload can the balloon lift? (The density of air is 1.29 kg/m3; the density of helium is 0.18 kg/m3.)
a. 150 kg c. 333 kg b. 300 kg d. 444 kg
A 20-cm length of wire is held along an east-west direction and moved horizontally to the north with a speed of 3.0 m/s in a region where the magnetic field of the earth is 60 mT directed 30° below the horizontal. What is the magnitude of the potential difference between the ends of the wire?
a. 36 mV b. 18 mV c. 31 mV d. 24 mV e. 21 mV