Determine the potential difference Va ? Vb shown in the circuit below
a.
?5.0 V
b.
+5.0 V
c.
?10 V
d.
+10 V
e.
0 V
b
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The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass. An ordinary glass rod and a Pyrex glass rod of equal lengths at room temperature are dropped into boiling water. The change in length of the ordinary glass rod will be 3 times the change in length of the Pyrex glass rod
a. True b. False Indicate whether the statement is true or false
The nearest star is at a distance of 4.4 light-years. Given that light travels at 300,000 km/s in space, how far away is the nearest star in kilometers (km)?
A) 4.2 1013 km B) 2.7 1015 km C) 3.0 108 km D) 9.5 1012 km
When steam condenses to water, energy is
A) absorbed. B) released. C) conserved as the phase change occurs. D) transformed to a different form.
A positive ion is formed when
a. a neutral atom gains an electron. b. a neutral atom loses an electron. c. a negative ion loses an electron. d. all of the above