If I = 2.0 A in the circuit segment shown below, what is the potential difference VB?VA?
A. +10 V
B. ?20 V
C. ?10 V
D. +20 V
E. +30 V
Answer: C
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A 90-gram wire that is 1.0 m long is under tension. When a transverse wave of frequency 890 Hz travels down the wire, its wavelength is 0.10 m and its amplitude is 6.5 mm. What is the tension in the wire?
A) 710 N B) 820 N C) 930 N D) 1000 N E) 1100 N
Calculate the concentration of vacancies in silicon at the solid-liquid equilibrium temperature of 1683 K where single crystals of silicon are grown. The enthalpy of formation for vacancies in silicon is 2.3 eV/vacancy.
What will be an ideal response?
A parallel-plate capacitor has plates of area 0.40 m2 and plate separation of 0.20 mm. The capacitor is connected across a 9.0-V potential source. (?0 = 8.85 × 10-12 C2/N ? m2)
(a) What is the magnitude of the electric field between the plates? (b) What is the capacitance of the capacitor? (c) What is the magnitude of the charge on each plate of the capacitor? What will be an ideal response?
A spaceship is observed by a stationary observer to be moving at 0.600 c. A laser beam is shown straight ahead from the front of the spaceship. How fast does the laser beam travel relative to the observer?
A. 1.60 c B. 1.36 c C. 1.00 c D. 0.640 c E. 0.360 c