Cholesterol belongs to what class of organic compounds?

a. Alkyl halides
b. Esters
c. Carboxylic acids
d. Alcohols


d

Physics & Space Science

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A ball tossed vertically upward reaches its highest point and then falls back to its starting point. During this up-and-down motion the acceleration of the ball is always

A) in the direction of motion. B) opposite its velocity. C) directed upward. D) directed downward.

Physics & Space Science

What wavelength corresponds to the n = 2 ? n = 1 transition in singly-ionized helium?

A) 15.2 nm B) 22.8 nm C) 4.56 nm D) 11.4 nm E) 30.4 nm

Physics & Space Science

Which one of the following cannot be a statement of Gauss's law for some physical situation?

A.

4?r2?0E = Q.

B.
2?rL?0E = Q.

C.
.

D.
.

E.
.

Physics & Space Science

Intensity of Sound: At a distance of 15.0 m from a sound source, the intensity level is 60.0 dB. What is the intensity level (in decibels) at a point 2.00 m from the source if the source radiates equally in all directions?

A. 55.7 dB B. 57.5 dB C. 75.5 dB D. 77.5 dB

Physics & Space Science