This figure shows the life track of a 1 solar-mass star from its beginnings in a collapsing cloud fragment until it becomes a main-sequence star. At which of the numbered points is the object generating energy primarily from gravitational contraction?
A) Points 1, 2, and 3
B) Point 1 only
C) Point 2 only
D) Point 3 only
E) Point 4 only
F) Points 1 and 2 only
A) Points 1, 2, and 3
You might also like to view...
A small refrigerator freezer, 16 in x 16 in x 18 in outer dimensions, has an inside surface temperature of 10ºF and an outside surface temperature of 80ºF. If the walls are uniformly 3 inches thick, homogeneous, and with thermal properties the same as Styrofoam, estimate the heat transfer through the walls and door of the refrigerator.
What will be an ideal response?
A 1.0-C point charge is 15 m from a second point charge, and the electric force on one of them due to the other is 1.0 N. What is the magnitude of the second charge? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) 25 C B) 1.0 C C) 10 nC D) 0.025 C E) 25 nC
Which of these is NOT now on the surface of Mars?
A) Mars Global Surveyor B) Viking 1 C) Pathfinder D) Sojourner E) Spirit
When written in scientific notation, 42,300,000,000 is equal to _____
A) 423 × 1011 B) 4.23 × 1010 C) 0.423 × 1013 D) 42.3 × 108