A glass rod is rubbed with a piece of silk. During the process the glass rod acquires a positive charge and the silk
A) acquires a positive charge also.
B) remains neutral.
C) acquires a negative charge.
D) could either be positively charged or negatively charged. It depends on how hard the rod was rubbed.
C
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When a ferromagnetic material that has been magnetized is brought to a temperature greater than the Curie temperature, what happens to its residual magnetism?
A. Nothing happens to the residual magnetism. B. The residual magnetism disappears. C. The residual magnetism reaches it's highest value. D. All the magnetic domains causing magnetism become a single domain. E. The material of the magnet melts causing currents that are magnetic.
Sound waves are part of the Electromagnetic spectrum.
a. true b. false
If you point toward the zenith right now and then point there again 6 hours later, you will have pointed twice in the same direction relative to
a. your horizon. b. the Sun. c. the Moon. d. the fixed stars.
Free Fall: From the edge of a roof top you toss a green ball upwards with initial speed v0 and a blue ball downwards with the same initial speed. Air resistance is negligible. When they reach the ground below
A. the green ball will be moving faster than the blue ball. B. the blue ball will be moving faster than the green ball. C. the two balls will have the same speed.