A(n) ____________________ is a cool, dense cloud of dust and gas that is undergoing gravitational contraction
Fill in the blank(s) with correct word
protostar
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Energy Levels: An ionized atom having Z protons has had all but one of its electrons removed. If E is the total energy of the ground state electron in atomic hydrogen, then what is the total energy of the remaining electron in the ionized atom?
A. Z2E B. ZE C. E D. E/Z E. E/Z2
DNA is important to a cell because
a. DNA is the cell membrane that allows nutrients to enter the cell and waste to leave. b. DNA contains the information necessary to make all of the molecules required by the organism. c. DNA contains the information necessary for the cell to reproduce itself. d. all of the above e. b and c above
A quantity that has both a magnitude and direction associated with it is called a __________
Fill in the blank(s) with correct word
A uniform rod (mass = 1.5 kg) is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest in a horizontal position. What is the angular speed of the rod when the rod makes an angle of 30° with the horizontal? (The moment of inertia of the rod about the pin is 2.0 kg×m2)
a. 2.2 rad/s b. 3.6 rad/s c. 2.7 rad/s d. 3.1 rad/s e. 1.8 rad/s