Which of the following is not a characteristic of the stars of the disk component of our galaxy?
a. circular orbits
b. randomly inclined orbits
c. higher metal abundance
d. young stars
e. star-formation regions
b
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For a plane to be able to fly clockwise in a horizontal circle as seen from above, in addition to exerting a force downwards on the air
A. it must be increasing its speed. B. it must exert a force on the air that is directed to the plane's left side. C. it must exert a force on the air that is directed to the plane's right side. D. it does not need to exert a force: it must only move the wing flaps out. E. it only needs to deflect the air without exerting any additional force on the air.
The lowest energy level of a certain quantum harmonic oscillator is 5.00 eV. What is the energy of the next higher level?
A) 15.0 eV B) 7.50 eV C) 10.0 eV D) 50.0 eV E) 20.0 eV
In a series RLC ac circuit, a second resistor is connected in parallel with the resistor previously in the circuit. As a result of this change, what happens to the impedance of the circuit?
A) It does not change. B) It decreases. C) It decreases for frequencies below resonance and increases for frequencies above resonance. D) It increases. E) It increases for frequencies below resonance and decreases for frequencies above resonance.
Which of the following is a true "wave," as physicists define the term?
A) light B) water flowing downhill in a mountain stream C) ocean waves coming into a beach D) None of the above. E) All of the above.