Phase Angles: An series circuit consists of an ac voltage source, a resistor of resistance 810 ?, and an inductor. (There is no capacitance in the circuit.) The current amplitude is 0.40 A, and the phase angle between the source voltage and the current has magnitude 11°. (a) Does the source voltage lag or lead the current?(b) What is the voltage amplitude of the source?
What will be an ideal response?
(a) The source voltage leads the current. (b) 330 V
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In brittle materials, the easiest way to increase the _________strength is to decrease the size of cracks and pores.
Fill in the blank(s) with the appropriate word(s).
A hospital patient confined to bed will be less likely to develop bed sores with a
A) firm mattress. B) soft mattress. C) water bed. D) none of these will help.
A camera lens having a 50-mm focal length is set to f/4.0. What is the minimum spacing of two objects located 12 m from the lens if the objects are just barely resolved in the image using light of wavelength 500 nm?
A) 4.9 × 10-5 m B) 0.024 mm C) 0.59 mm D) 4.72 mm E) 1.66 mm
Equipotentials are lines along which
a. the electric field is constant in magnitude and direction. b. the electric charge is constant in magnitude and direction. c. maximum work against electrical forces is required to move a charge at constant speed. d. a charge may be moved at constant speed without work against electrical forces. e. charges move by themselves.