Exclusion Principle: In a hydrogen atom, a given electron has n = 7. How many possible values can ? have?
A. 6
B. 7
C. 15
D. 98
Answer: B
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Projectile Motion: As shown in the figure, a projectile is fired at time t = 0.00 s, from point 0 at the upper edge of a cliff, with initial velocity components of v0x = 30 m/s and v0y = 300 m/s. The projectile rises and then falls into the sea at point P. The time of flight of the projectile is 75.0 s, and air resistance is negligible. At this location, g = 9.80 m/s2. What is the horizontal distance D? 
A. 2250 m B. 2520 m C. 2790 m D. 3060 m E. 3330 m
A 5.0-m long, 12-kg uniform ladder rests against a smooth vertical wall with the bottom of the ladder 3.0 m from the wall. The coefficient of static friction between the floor and the ladder is 0.28
What distance, measured along the ladder from the bottom, can a 60-kg person climb before the ladder starts to slip? A) 4.0 m B) 3.7 m C) 1.7 m D) 1.3 m E) 3.3 m
The human eye is sensitive to light with wavelength down to 710 nm. What is the frequency of radiation at this wavelength? (1 nm = 10?9 m and c = 3.00 × 10^8 m/s)
a. 4.23E+5 Hz b. 4.42E+6 Hz c. 4.23E+14 Hz d. 4.37E+7 Hz e. 2.18E+7 Hz
What is the radius of curvature of the path of a 3.0-keV proton in a perpendicular magnetic field of magnitude 0.80 T?
a. 9.9 mm b. 1.1 cm c. 1.3 cm d. 1.4 cm e. 7.6 mm