Compared to our Sun, most stars in the halo are
A) old, red, and bright and have fewer heavy elements.
B) old, red, and dim and have many more heavy elements.
C) young, red, and dim and have fewer heavy elements.
D) old, red, and dim and have fewer heavy elements.
E) young, blue, and bright and have many more heavy elements.
D
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A parallel-plate capacitor is connected to a battery and becomes fully charged. The capacitor is then disconnected, and the separation between the plates is increased in such a way that no charge leaks off
As the plates are being separated, the energy stored in this capacitor A) increases. B) decreases. C) does not change. D) become zero.
Which of the following is the strongest?
A) a chemical bond B) an ion-dipole attraction C) a dipole-dipole attraction D) a dipole-induced dipole attraction E) an induced dipole-induced dipole attraction
The specific heat capacity of aluminum is more than twice that of copper. Place equal masses of aluminum and copper wire in a flame and the wire to heat up quickest will be
A) copper. B) aluminum. C) both the same
A block having mass m travels along a horizontal frictionless surface with speed v. What is the smallest amount of work that must be done on the block to reverse its direction?
1.–mv² 2.–½mv² 3.0 4.½mv² 5.mv² 6.None of the above 7.Cannot be determined