How do we know that there are large gaps in the average distances of asteroids from the Sun (within the asteroid belt)?
A) We can see the gaps through telescopes.
B) We can identify the gaps by looking for stellar occultations in which an asteroid passed in front of a star as seen from Earth.
C) We have not actually detected any gaps, but theory says they must exist.
D) We know the gaps must be present to explain how our spacecraft have successfully navigated the asteroid belt without suffering collisions.
E) We notice gaps on graphs showing the distribution of asteroids with different orbital periods.
E) We notice gaps on graphs showing the distribution of asteroids with different orbital periods.
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Refer to the figure above showing the abundance of elements in the galaxy relative to hydrogen. What is the general trend in elemental abundance?
A) Elements with more protons are less abundant. B) Elements with more protons are more abundant. C) Elements heavier than iron do not exist. D) Elements heavier than iron are relatively abundant. E) There is no apparent trend in the abundance of elements.
In the halo, we do NOT find:
A) tidal streams. B) globular clusters. C) small satellite galaxies. D) spiral arms. E) old white dwarfs.
A proton has a total energy of 2.5 × 10^?10 J. How fast is it moving? (M = 1.67 × 10^?27 kg)
a. 0.90 c b. 0.80 c c. 0.70 c d. 0.60 c e. 0.40 c
To investigate the nature of heat produced during the boring process, Count Rumford placed a dull boring tool and a brass cylinder in a barrel filled with cold water. The boring tool was forced against the bottom of the cylinder and rotated by two horses as shown in this figure. What would happen if the water used to cool the bore of the cannon were not replenished while the horses continued to
provide mechanical energy? a. The temperature of the water would decrease as the temperature of the cannon bore increases. b. The temperature of the water would increase until it boils and evaporates. c. It would cause less resistance and the horses will not be able to transmit as much energy though work. d. Only a limited amount of heat can be extracted from the apparatus during a given session, so whether all the water boils away depends on how much water is used. e. Work and heat are distinct, so there is no significant effect on the water.