4.0 J of work are performed in stretching a spring with a spring constant of 2500 N/m. How much is the spring stretched?
A)
3.2 cm
B)
3.2 m
C)
0.3 cm
D)
5.7 m
E)
5.7 cm
E
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A wire of radius 0.15 mm is made of an unknown metal and carries a current of 8.4 mA. The drift velocity for electrons in the wire is measured to be 36 x 10-6 m/s. What is the carrier density of the metal from which the wire is made?
A. 
B. 
C. need more information to do this calculation.
D. 
When water freezes, the entropy of the water
A. increases. B. decreases. C. does not change. D. depending on other factors could increase or decrease
Compared with the mass of an apple on Earth, the mass of the same apple on the Moon is
A) less. B) more. C) the same.
Radio maps of the spiral arms of our galaxy Group of
a.They map the location of dense neutral hydrogen clouds b.They map the location of hot O and B stars by the radio radiation they emit c.They reveal that the Sun is currently located in the centre of a spiral arm d.They reveal that our galaxy is a grand design spiral