Which of the following are possible causes for mass extinctions on Earth?
A) episodes of widespread volcanism
B) impacts of asteroids
C) snowball Earth episodes
D) all of these can be responsible for mass extinctions
D
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Which of the following types of Universe has no center and no edge?
a. closed b. flat c. open d. All of the other choices are correct.
At what rate is the gravitational force on a 2.0-kg projectile doing work at an instant when the velocity of the projectile is 4.0 m/s directed 30° above the horizontal?
a. +39 W b. ?78 W c. ?39 W d. +78 W e. +25 W
What is the mean free path of a gas of hard spheres of radius 2.00 × 10-9 m when the number of spheres per volume is 3.00 × 1019 m-3?
A) 1.17 × 10-4 m B) 4.00 × 10-9 m C) 9.76 × 10-5 m D) 1.88 × 10-3 m E) 4.69 × 10-4 m
The change in size of an object due to thermal expansion depends upon
a. what the object is made of b. the object's original size c. how much the temperature changes d. A and C e. all of the above