All materials are magnetic and are described by one of these three properties. Select the property that is invalid.
A. ferromagnetic
B. nonmagnetic
C. diamagnetic
D. paramagnetic
B. nonmagnetic
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Which of these is a refinement that Niels Bohr made to the Rutherford model of the atom?
A. Electrons orbit about a dense positively charged nucleus. B. Atoms consist of negatively charged electrons and positively charged protons. C. An electron's angular momentum is quantized, but not in integral multiples of ?. D. Electrons can exist only in certain circular orbits about the nucleus.
A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz. After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn? The speed of sound in air is 343 m/s
A) 68 Hz B) 69 Hz C) 70 Hz D) 71 Hz E) 72 Hz
The cosmic microwave background gives us a view of the universe when it was
A) 380,000 years old. B) 14 billion years old. C) about 1 million years old. D) 3-5 minutes old.
A car enters a level, unbanked semi-circular hairpin turn of 100 m radius at a speed of 28 m/s. The coefficient of friction between the tires and the road is m = 0.800 . If the car maintains a constant speed of 28 m/s, it will
a. attempt to dig into the road surface. b. tend to veer toward the center of the semicircle. c. arrive safely at the end of the semicircle. d. tend to veer toward the outside of the circle. e. veer toward the center for the first quarter-circle, then veer toward the outside for the second quarter-circle.