Inserting a dielectric material between two charged parallel conducting plates, originally separated by air and disconnected from a battery, will produce what effect on the capacitor?
a. increase voltage
c. increase capacitance
b. increase charge
d. decrease capacitance
C
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Resolution: The two stars in a binary star system have an angular separation of 1.0 × 10-5 rad. If the wavelength of the light from the system is 500 nm, what is the smallest diameter aperture telescope that could just resolve this system to show that it contains two stars?
A. 0.50 cm B. 0.61 cm C. 5.0 cm D. 6.1 cm
Two ropes are attached to a 50-kg object. The first rope applies a force of 35 N and the second, 55 N. If the two ropes are perpendicular to each other, what is the resultant acceleration of the object?
a. 1.3 m/s2 b. 35 m/s2 c. 1.8 m/s2 d. 65 m/s2 e. 0.77 m/s2
What is the longest wavelength of light that can cause photoelectron emission from a metal that has a work function of 2.20 eV? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 417 nm B) 257 nm C) 344 nm D) 565 nm E) 610 nm
A step-up transformer steps up voltage by ten times. Neglecting slight losses, if 100 W of power go into the primary coil, the power coming from the secondary coil is
A) 1 W. B) 10 W. C) 100 W. D) 1000 W. E) none of the above