The normal mode of a resonating system is sinusoidally disturbed at a frequency . Assume that , where is the normal mode’s natural frequency. (a) What is the amplitude of the normal mode’s oscillation compared to its amplitude in the limit that the disturbance frequency goes to zero if is about 1.4 ?
A. Roughly zero
B. Roughly 
/30
C. Roughly /1.4
D. Roughly
E. Roughly 1.4
F. Roughly 30
T. Other (specify)
D. Roughly
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The Earth is 93 million miles (mi) from the Sun and its period of revolution is 1 year = 3.15 × 10^7 s. What is the acceleration of the Earth in its orbit about the Sun?
a. 18.6 mi/s2 c. 13.6 × 10^-6 mi/s2 b. 9.3 × 10^-3 mi/s2 d. 3.7 × 10^-6 mi/s2
Which of the following nuclear fuels does a twenty-solar-mass star NOT fuse over the course of its entire evolution?
a. hydrogen b. carbon c. nitrogen d. oxygen e. iron
The electrons in a beam are moving at 18 m/s. (melectron = 9.11 × 10-31 kg, h = 6
626 × 10-34 J ? s) (a) What is its de Broglie wavelength these electrons? (b) If the electron beam falls normally on a diffraction grating, what would have to be the spacing between slits in the grating to give a first-order maximum at an angle of 30° with the normal to the grating?
Simple physics predicts that neutron stars should:
A) spin very slowly. B) be very cool. C) have a radius of more than 100 km. D) have strong magnetic fields.