Consider two copper wires. One has twice the length of the other. How do the resistances of these two wires compare?
A)
Both wires have the same resistance.
B)
The longer wire has half the resistance of the shorter wire.
C)
The longer wire has twice the resistance of the shorter wire.
D)
none of the given answers
C
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Suppose we look at two distant galaxies: Galaxy 1 is twice as far away as Galaxy 2. In that case
A) Galaxy 1 must be twice as big as Galaxy 2. B) we are seeing Galaxy 1 as it looked at an earlier time in the history of the universe than Galaxy 2. C) we are seeing Galaxy 1 as it looked at a later time in the history of the universe than Galaxy 2. D) Galaxy 2 must be twice as old as Galaxy 1.
If an element has 10 protons and 11 neutrons and 10 electrons, which expression correctly identifies the element?
A) neon-21 B) neon-11 C) neon-31 D) sodium-11 E) sodium-20
Which of the following could be associated with a temperature increase for a fixed amount of gas?
1.a decrease in the volume at constant pressure 2.a decrease in the pressure at constant volume 3.a decrease in both the pressure and the volume 4.an increase in the pressure at constant volume
A solid disk is released from rest and rolls without slipping down an inclined plane that makes an angle of 25.0° with the horizontal. What is the speed of the disk after it has rolled 3.00 m, measured along the plane?
A) 2.04 m/s B) 3.53 m/s C) 4.07 m/s D) 5.71 m/s E) 6.29 m/s