A 0.30-kg mass is suspended on a spring. In equilibrium the mass stretches the spring 2.0 cm downward. The mass is then pulled an additional distance of 1.0 cm down and released from rest. Write down its equation of motion
A) y = (0.01 m) cos (22.1 t)
B) y = (0.01 m) sin (22.1 t)
C) y = (0.03 m) cos (22.1 t)
D) y = (0.03 m) sin (22.1 t)
A
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(a) Calculate the distance required to reduce a beam of photons of energy 1.0 eV that have entered germanium to 50 percent of the initial intensity. (b) What is the wavelength of photons of energy 1.0 eV? (c) Photons of 1.0 eV correspond to what type of electromagnetic radiation? (d) Comment on using germanium for the lenses of an optical system to operate with 1.0 eV photons.
Total Internal Reflection: A glass plate having an index of refraction is 1.66 is immersed in a certain alcohol. The surface of the glass is inclined at an angle of 44° with the vertical. When a horizontal ray in the glass strikes the interface, you observe that it is at the critical angle. What is the index of refraction of the alcohol?
A. 1.15 B. 1.13 C. 1.11 D. 1.09 E. 1.17
One of the methods used to date supernova remnants (the remains of exploded stars) today is by using
A. the works of Ptolemy. B. the records of ancient Chinese, Japanese, and Korean astronomers. C. Kepler's laws. D. the notebooks of Galileo.
Convert 1.2 × 10-3 to decimal notation
A) 1.200 B) 0.1200 C) 0.0120 D) 0.0012 E) 0.00012