When an object is effectively isolated from external torques, like an ice skater twirling on the tip of one skate, the angular momentum of the object
a. can be increased by shifting mass out away from the axis of rotation.
b. can be decreased by shifting mass out away from the axis of rotation.
c. can be increased by shifting mass in toward the axis of rotation.
d. can be decreased by shifting mass in toward the axis of rotation.
e. cannot be changed except by friction at the point of contact.
e
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The central part of Earth's core consists of iron-rich liquid.
Answer the following statement true (T) or false (F)
One advantage of the Hubble Space Telescope over ground based ones is that
A) it can make better observations of the ozone layer. B) it can better focus X-ray images. C) its adaptive optics controls atmospheric blurring better. D) in orbit, it can operate close to its diffraction limit at visible wavelengths. E) it is larger than any Earth-based telescopes.
A(n) ________ represents a relatively peaceful mass loss as a red giant becomes a white dwarf
A) nova B) planetary nebula C) supernova D) emission nebula E) supernova remnant
Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. Kinetic energy
a. is definitely conserved b. is definitely not conserved c. may or may not be conserved d. none of the above