If the velocity of an object is negative,
a. its speed is decreasing
b. its velocity does not exist
c. it is reversing direction
d. it is moving in the direction labeled negative
D
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This diagram represents an edge-on view of our Milky Way Galaxy. Of the four labeled points, which one could represent the Sun's position in the galaxy?
A) point 1 B) point 2 C) point 3 D) point 4
A 60-W and a 100-W light bulb are connected in series to a 120-V outlet. Which bulb draws more current?
A) 60-W bulb B) 100-W bulb C) both the same.
What do we think condensed out of the solar nebula?
a. hydrogen and helium b. hydrogen compounds c. rocky material d. metals e. all except a
In order to cool a cup of hot tea, someone adds some cold milk and then waits 5 minutes. Would the tea have been cooler at the end of the 5-minute period if the person first waited 5 minutes and then added the cold milk? Assume that the temperature of the milk is the same whenever it is to be added
1.No, the tea would be cooler after 5 minutes if the cold milk were added as soon as possible. 2.Yes, the tea would be cooler after 5 minutes if the cold milk were added at the end of the 5-minute period. 3.The final temperature of the tea would be the same in either case. 4.The one that would be cooler depends on the actual temperatures and amounts of the tea and the milk.