Radioactivity Basics: The nuclei of 
He are also known as
A. ? particles.
B. ? particles.
C. ? rays.
D. x-rays.
E. positrons.
Answer: A
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Where would you expect to isolate molecules in a fractionating tower that have a large number of interatomic forces?
A) near the bottom B) near the top C) near the middle D) Fractional distillation takes advantage of molecular weight. E) Fractional distillation takes advantage of the number of isomers.
Two identical vertical springs S1 and S2 have masses m1 = 400 g and m2 = 800 g attached to them. If m1 causes spring S1 to stretch by 4 cm, what is the ratio of the potential energy of S1 and S2? Use g = 10 m/s2
A) 2:1 B) 1:2 C) 1:3 D) 4:1 E) 1:4
Self-Inductance: A coil with a self-inductance of 6.0 H is connected to a dc battery through a switch. As soon as the switch is closed, the rate of change of current is 2.0 A/s. What is the emf induced in this coil at this instant?
A. 6.0 V B. 3.0 V C. 12 V D. 0.33 V E. 0.0 V
A metal sphere of radius 2.0 cm carries an excess charge of 3.0 ?C. What is the electric field 6.0 cm from the center of the sphere? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 6.4 × 106 N/C B) 5.7 × 106 N/C C) 4.2 × 106 N/C D) 7.5 × 106 N/C E) 9.3 × 106 N/C