A single slit of width a is illuminated by light of wavelength ?. If a = 4.3?, the maximum number of dark fringes on a semi-circular screen surrounding the slit is
a. 2.
b. 4.
c. 6.
d. 8.
e. 9.
d
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A 2000 kg car is traveling at 20.0 m/s down a long mountain grade of 1.00%. The mountain road is 3.00 km long. The heat generated at the brakes due to friction heats up the brakes. The mass of the brake system is 20.0 kg and it has a specific heat of 0.200 kcal/kg 
What is the increase in the temperature of the brakes?
A. 22.3 
B. 35.1
C. 40.2
D. 45.2
E. 53.6
________ is the smallest planet in the solar system
Fill in the blank(s) with correct word
Avogadro's number is related to the universal gas constant R and the number of moles n by:
a. NA = Rn b. NA = R/n c. NA = n/R d. Avogadro's number cannot be related to these two quantities alone.
A hydrogen atom consists of a single proton and a single electron. If the distance between the proton and the electron were doubled, the electric force would be
1) 1/4 as much, 2) 1/2 as much, 3) twice as much, 4) not enough information to say, and if instead the distance between the electron and proton were halved, the electric force would be 5) 1/4 as much. 6) 1/2 as much. 7) twice as much. 8) four times as much. 9) not enough information to say