Which of the following particles will repel one another?
A. a neutron and a negative ion
B. a proton and an electron
C. a negative ion and an electron
D. a neutron and a neutron
C. a negative ion and an electron (Like charges repel each other; unlike charges attract. Both particles, in this case, are negatively charged.)
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The vast majority of pulsars are known only from their pulses in:
A) X-rays. B) gamma-rays. C) visible light. D) microwaves. E) radio waves.
Steven Weinberg, Abdus Salam, and Sheldon Glashow shared the 1979 Nobel Prize in physics for their development of a(n)
a. electroweak theory. b. GUT. c. quark theory. d. generalized theory of relativity. e. theory of strangeness.
The decay constant of radon is 0.181 day s-1. A sample of radon contains 6.00 × 108 radon atoms. How many atoms are left after 10.0 days?
A) 9.82 × 107 B) 7.67 × 107 C) 8.34 × 108 D) 7.29 × 108 E) 8.56 × 108
A 5.0-m radius playground merry-go-round with a moment of inertia of 2000 kg ? m2 is rotating freely with an angular speed of 1.0 rad/s
Two people, each of mass 60 kg, are standing right outside the edge of the merry-go-round and suddenly step onto the edge with negligible speed relative to the ground. What is the angular speed of the merry-go-round right after the two people have stepped on? A) 0.20 rad/s B) 0.40 rad/s C) 0.60 rad/s D) 0.80 rad/s E) 0.67 rad/s