Particles (mass of each = 0.20 kg) are placed at the 40-cm and 100-cm marks of a meter stick of negligible mass. This rigid body is free to rotate about a frictionless pivot at the 0-cm end. The body is released from rest in the horizontal position. What is the initial angular acceleration of the body?
a. 12 rad/s2
b. 5.9 rad/s2
c. 8.4 rad/s2
d. 5.4 rad/s2
e. 17 rad/s2
a
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Current observations indicate that the amount of baryonic matter and dark matter in the Universe
a. is sufficient great enough to overcome the expansion of the Universe. b. implies that the Universe is closed. c. is mostly in the form of black holes and quasars. d. are roughly equal. e. implies that the Universe is open.
After a supernova explosion, the remains of the stellar core can be
A) either a neutron star or a black hole. B) a neutron star only. C) a black hole only. D) a white dwarf, neutron star, or black hole.
An electric motor can be manually turned and made to act as a generator
Indicate whether the statement is true or false
First Law of Thermodynamics: During an isochoric process, the internal (thermal) energy of a gas decreases by 50 J. How much heat is added to the gas during this process?
A. 0 J B. 50 J C. -50 J D. 25 J E. -25 J