The coefficient of the restitution of an object is defined as the ratio of its outgoing to incoming speed when the object collides with a rigid surface
For an object with a coefficient of 0.78, what fraction of the object's kinetic energy is lost during a single collision?
A) 47% B) 61% C) 39% D) 16%
C
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By approximately _________ years ago, _________ had produced oxygen in enough amounts to be a significant fraction in Earth's atmosphere.
a. 100 million; trees and plants b. 1 billion; trees and plants c. 250 million; bacteria and algae d. 2.5 billion; bacteria and algae e. 2,000; animals and humans
If the Sun's core suddenly shrank a little bit, what would happen in the Sun?
A) The core would cool off and continue to shrink as its density increased. B) The density of the core would decrease, causing the core to cool off and expand. C) The core would heat up, causing it to radiate so much energy that it would shrink even more. D) The core would heat up, fusion rates would increase, and the core would re-expand.
The bond between carbon atoms in the molecule ethane, H3C—CH3 is referred to as
A) a triple bond B) an ionic bond C) a single bond D) a double bond
What is the equivalent resistance between points a and b?
a.
14 ?
b.
8.0 ?
c.
6.0 ?
d.
25 ?
e.
40 ?