The first 87% of geologic time is often called
a. Hadean time.
b. Pangaean time.
c. Precambrian time.
d. Proterozoic time.
c
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Calculate the critical angle for total internal reflection in a fiber-optic cable made from quartz glass with a coating of polyethylene.
What will be an ideal response?
A 4.20-g bullet embeds itself in a 20.0-kg block, which is attached to a horizontal spring with a force constant of 950 N/m. The maximum compression of the spring is 2.10 cm. What is the speed of the bullet just before it hits the block?
A) 690 m/s B) 700 m/s C) 672 m/s D) 900 m/s E) 952 m/s
Kinetic and potential energies are forms of ______________ energy
Fill in the blank(s) with correct word
When we say charges are ‘positive' or ‘negative' we are speaking of
a. two intrinsically different types of charge found in nature. b. an excess vs. a deficiency of charge. c. charges existing vs. not existing. d. none of the above.