What would happen to Jupiter if we could somehow double its mass?
A) Its density would decrease and its diameter would double.
B) Its density would stay about the same and its volume would double.
C) Its density would increase but its diameter would barely change.
D) It would become a star, with nuclear fusion in its core.
C
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In addition to the electric force law and the magnetic force law, the other key principle that is needed to explain electromagnetic waves is
A) electromagnetic forces can be felt across a distance. B) Newton's law of motion. C) electromagnetic fields are established instantaneously. D) forces always come in pairs, so for every sender of electromagnetic force there must be a receiver. E) electromagnetic fields are not established instantaneously.
Does the magnetic force on the longer sides of the generator loop help or hinder the rotation of the generator loop?
A. The magnetic forces on the loop hinder the rotation of the generator loop. B. The magnetic forces on the loop neither help nor hinder the rotation of the generator loop. C. The magnetic forces on the loop help the rotation of the generator loop.
Two wave crests are generated at opposite ends of a long rope. Will there be an instant in which the rope's amplitude is zero everywhere?
A) no B) Yes, if the waves have different amplitudes. C) Yes, if the waves have the same amplitude.
To which group of polymers does nylon belong?
a. Natural b. Hydrolytic c. Addition d. Condensation