An example of igneous rock is
a. marble.
b. shale.
c. slate.
d. granite.
d
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Helioseismology is the study of the differential rotation and magnetic field of the Sun
a. True b. False Indicate whether the statement is true or false
How does a black hole form from a massive star?
A) During a supernova, if a star is massive enough for its gravity to overcome neutron degeneracy of the core, the core will be compressed until it becomes a black hole. B) Any star that is more massive than 8 solar masses will undergo a supernova explosion and leave behind a black-hole remnant. C) If enough mass is accreted by a white dwarf star so that it exceeds the 1.4-solar-mass limit, it will undergo a supernova explosion and leave behind a black-hole remnant. D) If enough mass is accreted by a neutron star, it will undergo a supernova explosion and leave behind a black-hole remnant. E) A black hole forms when two massive main-sequence stars collide.
When a massive star begins to run out of hydrogen to fuse, its outer layers of gas ________.
A. expand and cool B. contract and heat C. contract and cool D. expand and heat
The position of a particle moving along the x axis is given by x = 6.0t2 ? 1.0t3, where x is in meters and t in seconds. What is the position of the particle when it achieves its maximum speed in the positive x direction?
a. 24 m b. 12 m c. 32 m d. 16 m e. 2.0 m