What is the rms current for an 8.0 ?F capacitor attached to a 120 V rms 60 Hz source?
A. 2.8 A
B. 1.4 A
C. 0.72 A
D. 0.36 A
E. 0.18 A
D. 0.36 A
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Which method relies on the mass of a dark object revealing its presence?
A) pulsars slowing down irregularly B) temporary brightening of a distant star by a gravity lens C) asteroidal occultations D) stellar eclipses E) ring occultations
A positively charged metal sphere A is brought into contact with an uncharged metal sphere B. As a result:
A) both spheres are positively charged B) A is positively charged and B is neutral C) A is positively charged and B is negatively charged D) A is neutral and B is positively charged E) A is neutral and B is negatively charged
What is the mass of an object on which Earth exerts a gravitational force of 685 N near Earth's surface where g = 9.80 m/s2?
A) 69.9 kg B) 68.5 kg C) 71.3 kg D) 72.7 kg
Which one of the following is a physical change?
a. Rusting of iron b. Fermenting of grape juice c. Souring of milk d. Sharpening a pencil