A container of flint glass (n = 1.61) holds a small quantity of benzene (n = 1.501). What is the critical angle for internal reflection of a ray in the glass when it is incident on the glass-to-liquid surface?
a. 86.1°
b. 68.8°
c. 41.8°
d. 38.4°
e. 83.9º
b
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RLC Circuits: The figure shows a series ac circuit. The inductor has a reactance of 60 ? and an inductance of 150 mH. A 50-? R and a capacitor C whose reactance is 90 ? are also in the circuit, and the rms current in the circuit is 1.5 A. What is the rms voltage of the source? 
A. 87 V B. 84 V C. 81 V D. 78 V E. 75 V
A 2-kg ball is thrown horizontally at. a speed of 10 m/s. At the same time, a 1-kg ball is dropped from the same height. Ignoring air resistance, which ball hits the ground first?
a. the 2-kg ball b. it's a tie c. the 1-kg ball
A transformer consists of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primary?
A) 0.75 A B) 1.3 A C) 12 A D) 24 A E) 48 A
A child on a sled starts from rest at the top of a 15° slope. If the trip to the bottom takes 15.2 s, how long is the slope? Assume that frictional forces may be neglected
A) 293 m B) 586 m C) 1130 m D) 147 m