A parallel plate capacitor with plate separation of 4.0 cm has a plate area of 4.0 × 10-2 m2. What is the capacitance of this capacitor with air between these plates?
A) 8.9 × 10-11 F
B) 8.9 × 10-12 F
C) 8.9 × 10-13 F
D) 8.9 × 10-14 F
E) 8.9 × 10-15 F
B
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The second shell of an atom can hold a maximum of ______________ electrons
Fill in the blank(s) with correct word
As the rock in this figure falls after being dropped from a great height:
a. its speed increases until it reaches a constant value, but its acceleration decreases gradually to zero. b. its speed continues to increase while its acceleration goes to zero. c. both the speed and the acceleration increase. d. its speed decreases while its acceleration continues to increase. e. its speed slows to zero while its acceleration reaches a terminal value.
A jack system will increase the potential energy of a heavy load by 1000 J with a work input of 2000 J. The efficiency of the jack system is
A) 10%. B) 20%. C) 50%. D) 80%. E) need more information
Identify with an H or L to which family, hadron or lepton, each of the following belong: proton; neutrino; pion; tauon
What will be an ideal response?