The amount of current in an incandescent bulb rated 75W 120V is about
A) 0.4 A.
B) 0.6 A.
C) 1.2 A.
D) more than 1.2 A.
Answer: B
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The mass of a star is 8.0 × 10^30 kg, and the mass of a hydrogen atom is 1.67 × 10^?27 kg. If we assume that the star is mostly composed of hydrogen, approximately how many atoms are there in the star?
a. 1.3E+4 atoms b. 2.1E–58 atoms c. 4.8E+57 atoms d. 8.0E+30 atoms
In which of the following cases does TANSTAAFL apply?
a. common use of land for grazing of sheep b. use of air in industrial processes c. use of water for power plant cooling d. TANSTAAFL applies in all the above cases. e. TANSTAAFL does not apply in any of the above cases.
A crate sits on the ground. You push as hard as you can on it, but you cannot move it. At any given time when you are pushing, what is the magnitude of the static friction force exerted on the crate by its contact interaction with the ground compared to the magnitude of your push (which is a normal force)? (Hints: What is the crate’s acceleration? Draw a free-body diagram.)
A. 
B. 
C. 
D. 
E. We do not have enough information to answer.
Three point charges are positioned as follows: 
is at (0.00 m, 0.00 m), 
is at (1.20 m, 0.00 m), and 
is at (1.20 m, 1.60 m). If all three charges are negative, into which quadrant is the force on 
pointing?
A. 1st B. 2nd C. 3rd D. 4th E. there isn't enough information in the problem to solve this