Two very small plastic balls of equal mass are released from rest. One of them carries +10 µC of excess charge and the other one carries +1µC of charge
No other charges or fields are present. Which of the following statements are true about them as they move away from each other? (There may be more than one correct choice.)
A) The acceleration of the 10-µC ball is 10 times that of the 1-µC ball.
B) The balls always have accelerations of equal magnitude.
C) The speed of the balls keeps increasing.
D) The acceleration of the balls keeps increasing.
E) The acceleration of the 1-µC ball is 10 times that of the 10-µC ball.
B, C
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Calculate the rate of heat transfer between a pair of concentric horizontal cylinders 20 mm and 126 mm in diameter. The inner cylinder is maintained at 37°C and the outer cylinder is maintained at 17°C.
GIVEN
• Concentric cylinders
• Smaller diameter (Di) = 20 mm = 0.02 m
• Larger diameter (Do) = 126 mm = 0.126 m
• Inner cylinder temperature (Ti) = 37°C
• Outer cylinder temperature (To) = 17°C
FIND
The rate of heat transfer (q)
ASSUMPTIONS
• Steady state
• The space between the cylinders is filled with air
• Radiative heat transfer is negligible
PROPERTIES AND CONSTANTS
for dry air at the mean temperature of 27°C
The second postulate of special relativity states that the speed of light, when measured in a vacuum, is constant for all observers
a. True b. False Indicate whether the statement is true or false
If a nuclide has a half-life of 100 s, what is the corresponding mean lifetime?
A. 100 s B. 144 s C. 69 s D. 50 s E. 75 s
What is the source of Jupiter's intense radio waves and magnetism?
A) charged particles trapped in Jupiter's solid iron core similar to Earth B) liquid metallic hydrogen swirling in the rapidly spinning mantle C) the ionized sulfur ejected into a torus around Jupiter by Io D) the auroral displays in the polar regions, just like with the Earth E) a liquid iron and nickel outer core, just like the Earth's magnetic field