A circuit consists of N resistors, all of resistance R, connected as shown below. A potential difference V is applied to the circuit. The equivalent resistance of the circuit is
A.
.B.
.C.
D.
E.
Answer: B
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A charged particle (mass = M, charge = Q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed V?
a. QVB toward the east b. Zero c. QVB toward the west d. QVB upward e. QVB toward the south
A glass thermometer using a thin column of ethyl alcohol at room temperature (293.0 K) is cooled. When the temperature reaches 273.0 K the column of alcohol is 15.50 cm high. How tall was it when the temperature was 293.0 K? The coefficient of volume expansion of mercury is 
A. 15.85 cm B. 15.86 cm C. Cannot answer without knowing the diameter of the column D. 15.62 cm
Exclusion Principle: According to the quantum mechanical model of the hydrogen atom, if the orbital angular momentum quantum number is ?, there will be how many permitted magnetic quantum numbers?
A. ?/2 B. 2? C. 2? + 1 D. 2? - 1 E. 3?
A spring-powered launcher has a spring with a spring constant of 50.0 N/cm. The launcher is prepared to launch a projectile by compressing the spring by 5.00 cm. If the mass of the projectile is 10.0 grams, then what is the velocity of the projectile when it is launched from the launcher?
A. 65.4 m/s B. 52.8 m/s C. 45.7 m/s D. 40.5 m/s E. 35.4 m/s