How many degrees of freedom does a diatomic molecule have?
a. 3
b. 6
c. 5
d. 7
e. 9
b
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Which statement best describes a neutron star's formation as a supernova explodes and the core begins to collapse inward?
a. neutrinos and antineutrinos combine into neutrons b. electrons and protons combine into neutrons and neutrinos c. electrons and protons combine into neutrons and neutrinos d. electrons and positrons combine into neutrons and neutrinos e. protons and antiprotons combine into neutrons and neutrinos
Suppose you want to determine the chemical composition of a distant planet or star. Which of the following will be most useful to have?
A) high spectral resolution B) high angular resolution C) high turbulence D) a radio telescope
Answer the following statement(s) true (T) or false (F)
1. A car moves backward 10 m in 2 s at a steady rate. The car’s speed is therefore –5 m/s. 2. An object is moving at a constant velocity. This means that an interaction must be delivering momentum to the object at a constant nonzero rate. 3.A bicyclist rounding a curve at a constant speed is receiving a nonzero net flow of momentum. 4. A human being’s weight could be 150 kg. 5. Suppose a moving cart (cart A) hits an identical cart (cart B) at rest. Cart B remains at rest after the collision, and cart A rebounds with a speed equal to its original speed. Cart B must have participated in some other interaction during the collision process,
Our Sun will never become hot enough for carbon nuclei to fuse
Indicate whether the statement is true or false