Each atom in a 7.0 microgram piece of calcium (A=40, Z=20) has one electron removed. What is the total charge collected in this way?
A. 34 mC
B. 670 mC
C. 17 mC
D. 60 mC
C. 17 mC
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What is the magnitude of the electric field 2.8 cm from a tiny object that carries an excess charge of -16 nC? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A) 180,000 N/C B) 5100 N/C C) 1.8 × 1014 N/C D) -180,000 N/C E) -5100 N/C
With only two exceptions, if a nucleus contains fewer ______________ than ______________, it is unstable
a. protons; neutrons b. neutrons; protons c. protons; alpha particles d. protons; beta particles
Is it possible for each of three current-carrying metal wires to repel the other two wires?
1.yes 2.no
200 g of ice at 0°C is dropped into a calorimeter of negligible heat capacity containing 350 g of water at 20°C. What is the temperature of the system when it reaches equilibrium? The latent heat of fusion of water is 80 cal/g
A) 0°C B) 24°C C) -13°C D) 13°C E) -24°C