The study of fossils is called
a)geology.
b)biology.
c)paleontology.
d)correlation.
c
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Force on a Moving Charge: If a calculated quantity has units of 
, that quantity could be
A. an electric field. B. an electric potential. C. ?0. D. a magnetic field. E. a magnetic torque.
Water at a temperature of 77°C is to be evaporated slowly in a vessel. The water is in a low pressure container surrounded by steam as shown in the sketch below. The steam is condensing at 107°C. The overall heat transfer coefficient between the water and the steam is 1100 W/(m2 K). Calculate the surface area of the container which would be required to evaporate water at a rate of 0.01 kg/s.
GIVEN
• Water evaporated slowly in a low pressure vessel surrounded by steam
• Water temperature (Tw) = 77°C
• Steam condensing temperature (Ts) = 107°C
• Overall transfer coefficient between the water and the steam (U) = 1100 W/(m2 K)
• Evaporation rate m
w= 0.01 kg/s
FIND
• The surface area (A) of the container required
ASSUMPTIONS
• Steady state prevails
• Vessel pressure is held constant at the saturation pressure corresponding to 77°C
SKETCH
PROPERTIES AND CONSTANTS
The heat transfer required to evaporate water at the given rate is q = m
You roll a ball off a table and at the same time drop a second ball straight down from the edge of the table. The second ball reaches the ground before the first ball
Indicate whether the statement is true or false
When radium-223 (Z = 88) decays to radon-119 (Z = 86), the other particle emitted is a(n)
a. alpha particle b. beta particle c. gamma ray d. x ray e. none of the above