Work: If the force on an object is in the negative direction, the work it does on the object must be
A. negative.
B. positive.
C. The work could be either positive or negative, depending on the direction the object moves.
Answer: C
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Series Resonance: In an RLC ac circuit, the values of the inductance and capacitance are both doubled. As a result of this change, the resonance frequency of the circuit is
A. the same as before. B. reduced to one-half the original value. C. reduced to one-fourth the original value. D. twice the original value. E. four times the original value.
How much charge can be placed on a capacitor of plate area 15 cm2 with air between the plates before it reaches "atmospheric breakdown" where E = 3.0 × 10^6 V/m? (?0 = 8.85 × 10^?12 C2/N?m2)
a. 4.0E–8 C b. 1.3E–8 C c. 1.8E–10 C d. 5.1E–8 C e. 1.7E–8 C
How much energy is stored in a room 3.0 m by 4.0 m by 2.4 m due to the earth's magnetic field with a strength of 5.0 × 10-5 T? (?0 = 4? × 10-7 T ? m/
A) A) 570 mJ. B) 29 mJ. C) 10 mJ. D) 100 mJ. E) 570 mJ.
In superstring theory the fundamental objects from which all forces and matter are built are:
a. Planck lengths. b. gravitons. c. gluons whose size of about 10^-25 m is the smallest distances in nature. d. loops of material that cannot be further subdivided, whose size of about 10^-35 m is the smallest distance in nature. e. quarks whose size of about 10^-25 m is the smallest distance in nature.