A student has written the equation below to convert a temperature in degrees Fahrenheit into Kelvins. What is wrong with this equation?
?
?
A.
.B.
should multiply (T(ºF) ? 32).C.
D.
E.
Answer: D
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Consider a container of 2.0 grams of hydrogen (one gram mole). Suppose you removed all the electrons and moved them to the other side of the Earth (Earth diameter 12740. Km)
(a) How much charge is left behind? (b) What is the attractive force between the protons here and the electrons at the other side of the Earth?
Two identical tubes are filled with water, one with fresh water and one with salt water. The pressure is greater at the bottom of the tube with
A) fresh water. B) salt water. C) both the same D) depends on whether the tubes have the same cross-sectional area
Three capacitors of capacitance 6 ?F each are given. The minimum and maximum capacitance, which may be obtained are?
A. 6 ?F, 18 ?F B. 3 ?F, 12 ?F C. 2 ?F, 12 ?F D. 2 ?F, 18 ?F
Pressure: When a heavy metal block is supported by a cylindrical vertical post of radius R, it exerts a force F on the post. If the diameter of the post is increased to 2R, what force does the block now exert on the post?
A. F/4
B. F/2
C. F/
D. F
E. 2F