A 16-? platinum wire at 20°C with a temperature coefficient of resistivity of 3.9 × 10^?3 (°C)?1 will have what resistance at 80°C?
a. 12 ?
b. 13 ?
c. 20 ?
d. 16 ?
e. 3.7 ?
c
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Simple Harmonic Motion: A ball is oscillating on an ideal spring with an amplitude of 8.3 cm and a period of 4.6 s. Write an expression for its position, x, as a function of time t, if x is equal to 8.3 cm at t = 0.0 s. Use the cosine function.
What will be an ideal response?
For large mass number nuclei which are stable, the ratio of protons to neutrons is
a. equal to 1 b. greater than 1 c. less than 1 d. unrelated to the stability of nuclei e. almost 2 to 1
What is an accretion disk?
A) a disk of hot gas swirling rapidly around a white dwarf, neutron star, or black hole B) any flattened disk in space, such as the disk of the Milky Way Galaxy C) a stream of gas flowing from one star to its binary companion star D) a disk of material found around every white dwarf in the Milky Way Galaxy
A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and a frequency of 2.55 Hz. How long does it take it to travel 11.43 cm?
A) 3.53 s B) 0.882 s C) 1.13 s D) 1.76 s E) 2.65 s