The remains of type II supernovae (massive star, core collapse supernovae) are seen in the sky as
A) nebulae that are shrinking as the central mass pulls them in.
B) nebulae that are expanding at thousands of kilometers per hour.
C) nebulae that are stellar nurseries.
D) white dwarfs.
E) white holes.
B
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Indicate whether the statement is true or false
Energy Conservation With Nonconservative Forces: As shown in the figure, a 4.0-kg block is moving at 5.0 m/s along a horizontal frictionless surface toward an ideal spring that is attached to a wall. After the block collides with the spring, the spring is compressed a maximum distance of 0.68 m. What is the speed of the block when the spring is compressed to only one-half of the maximum distance?
Fill in the blank(s) with the appropriate word(s).
A uniform 40-N board supports two children weighing 500 N and 350 N. If the support is at the center of the board and the 500-N child is 1.5 m from its center, how far is the 350-N child from the center?
A) 1.1 m B) 1.5 m C) 2.1 m D) 2.7 m
Find the average density of a white dwarf star if it has a mass equal to that of the sun (2.0 × 10^30 kg) and a radius equal to that of the Earth (6.4 × 10^6 m)
a. 9.0 × 10^6 kg/m3 b. 1.8 × 10^7 kg/m3 c. 1.8 × 10^9 kg/m3 d. 3.6 × 10^10 kg/m3 e. 9.0 × 10^7 kg/m3