Each atom in a sample of lithium (Z=3, atomic mass 6.941 u) has one electron removed. If exactly 1.0 mC was collected in this way, what is the mass of the lithium sample?
A. 0.024 ?g
B. 0.010 ?g
C. 0.031 ?g
D. 0.072 ?g
D. 0.072 ?g
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Is it possible for an object to accelerate but without changing its speed?
A) Yes, for example when a car is halfway up a straight hill [a hill whose slope, or angle with the horizontal, does not change] and moving a an unchanging speed. B) Yes, for example when a car turns a corner while maintaining an unchanging speed. C) Both of the above. D) No, because the word "acceleration" means "a change in speed." E) No, because the word "acceleration" means "speeding up."
Why are reflecting telescopes cheaper to build than refracting telescopes?
What will be an ideal response?
Magenta light is a mixture of
A) red and blue light. B) red and cyan light. C) red and yellow light. D) yellow and green light. E) none of the above
The current in amperes drawn by the heater is
a. 0.1 c. 144,000 b. 10 d. none of the above