Which of the following statements best describes the quantum property spin?
A) Spin is a measure of the rotation rate of a subatomic particle.
B) Spin is a measure of the rate at which a particle spins around (orbits) another particle.
C) Spin is a property that applies only to large objects, like baseballs.
D) Spin is not meant to be taken literally but measures the inherent angular momentum of a subatomic particle.
E) Spin is not a fundamental property but rather something that can change randomly at any time.
D
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How can the big bang still be found even though you may not be able to see it with your eyes? In what band of the electromagnetic spectrum has it been detected?
What will be an ideal response?
Suppose you watch a leaf bobbing up and down as ripples pass it by in a pond. You notice that it does two full up and down bobs each second. Which statement is true of the ripples on the pond?
A) They have a frequency of 2 hertz. B) They have a frequency of 4 hertz. C) We can calculate the wavelength of the ripples from their frequency. D) They have a wavelength of two cycles per second.
How is Einstein's famous equation, E= mc2, important in understanding the Sun?
A) It explains the fact that the Sun generates energy to shine by losing some 4 million tons of mass each day. B) It explains why the Sun's surface temperature is about 6,000°C. C) It explains why the Sun is so massive. D) It explains why the Sun has a magnetic field strong enough influence the atmospheres of the planets.
A mass (M1 = 5.0 kg) is connected by a light cord to a mass (M2 = 4.0 kg) which slides on a smooth surface, as shown in the figure. The pulley (radius = 0.20 m) rotates about a frictionless axle. The acceleration of M2 is 3.5 m/s2. What is the rotational inertia of the pulley?
?
?
a.
0.29 kg?m2
b.
0.42 kg?m2
c.
0.20 kg?m2
d.
0.62 kg?m2
e.
0.60 kg?m2