In the above image, the blue color is from a/an ____________ nebula whereas the pink color is from a/an ___________ nebula
a. dark, reflection
b. reflection, emission
c. emission, dark
d. emission, reflection
B
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A hockey puck traveling at speed v on essentially frictionless ice collides elastically with one end of a straight stick lying flat on the ice. In this collision
a. momentum is conserved. b. angular momentum is conserved. c. energy is conserved. d. all of the above are conserved. e. only momentum and angular momentum are conserved.
A solid disk and a hoop have different diameters but identical masses. Which one has a larger rotational inertia?
A. The hoop B. The solid disk C. It is impossible to know without knowing the diameters D. It is impossible to know without knowing the torques acting on the two objects
The law of conservation of momentum is applicable to systems made up of objects described by which of the following?
a. macroscopic b. microscopic c. interacting through friction d. All the above choices are valid.
Phase Angles: The phase angle of an RLC series ac circuit with an inductive reactance of 200 ? and a capacitive reactance of 100 ? is 40.0°. What is the resistance of the resistor in this circuit?
A. 100 ? B. 119 ? C. 156 ? D. 200 ? E. 265 ?