Which of the above illustrations shows a neutral aqueous solution?
A) A
B) B
C) C
D) All of the above are neutral solutions.
E) none of the above
Answer: B
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Estimate the depth in moist soil at which the annual temperature variation will be 10% of that at the surface.
GIVEN
Moist soil
FIND
The depth in moist soil at which the annual temperature variation will be 10 per cent of that at the surface
ASSUMPTIONS
Conduction is one dimensional
The soil has uniform and constant properties
Annual temperature variation can be treated as a step change in surface temperature with a 6 month
response time
SKETCH
The moon with a mass of 
kg is orbiting about the earth with a mass of 
kg at a radius of 
meters. The earth is orbiting about the sun with a mass of 
kg at a radius of 
meters. The force of gravity on the moon when it is between the earth and the sun is 
A. 
N toward the sun.
B. 
N toward the earth.
C. 
N toward the sun.
D. 
N toward the earth.
E. 
N toward the earth.
Which of the following is the file extension for Google's bitmap image format?
A. .psd B. .bmp C. .jpg D. .webp
A compass needle in a magnetic field experiences
A) a torque. B) a net force. C) both of these D) none of the above