All living cells use the molecule adenosine triphosphate (ATP)
A) to carry oxygen into cells
B) to catalyze biochemical reactions
C) as a building block for nucleic acids
D) to store and release energy for biochemical processes
D
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Where did Thomson's model place electrons in the atom?
a. Studded throughout a positively-charged material. b. Rotating around a positively-charged core. c. Uniformly distributed in the atom. d. Clustered in the center of a positively-charged sphere. e. At the two magnetic poles of the atom.
Rank the following events in the order that corresponds to the formation of a planetary system.
What will be an ideal response?
Two equal masses are raised at constant velocity by ropes that run over pulleys, as shown below. Mass B is raised twice as fast as mass A. The magnitudes of the forces are FA and FB, while the power supplied is respectively PA and PB. Which statement is correct?
?
?
A. FB = FA; PB = PA. B. FB = FA; PB = 2 PA. C. FB = 2 FA; PB = PA. D. FB = 2 FA; PB = 2 PA. E. PA = FA; PB = FB.
Derive an expression for the temperature distribution in an infinitely long rod of uniform cross section within which there is uniform heat generation at the rate of 1 W/m. Assume that the rod is attached to a surface at Ts and is exposed through a convective heat transfer coefficient h to a fluid at Tf.
GIVEN
• An infinitely long rod with internal heat generation
• Temperature at one end = Ts
• Heat generation rate ( q
GA) = 1 W/m
• Convective heat transfer coefficient = hc
• Ambient fluid temperature = Tf
FIND
• Expression for the temperature distribution
ASSUMPTIONS
• The rod is in steady state
• The thermal conductivity (k) is constant
SKETCH
