A series LRC ac circuit has a resistance of 4.0 k?, a capacitance of 33.0 ?F, and an inductance of 23.0 H. If the frequency of the alternating current is 2.0/? kHz,
what is the phase angle between the voltage and the current?
A) 23 rad B) -1.6 rad C) 1.5 rad D) 3.1 rad
C
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In a(n) _________test, the part is subject to a specified stress, and if the part does not fail, the maximum possible crack length is then calculated.
Fill in the blank(s) with the appropriate word(s).
Which of the following procedures would not be expected to increase the yield strength of LDPE?
(a) Quenching the LDPE to room temperature from the liquid state (b) Increasing the crystallinity (c) Increasing the molecular mass (d) Decreasing the side branching
Evidence that the universe is expanding is provided by Hubble's Law which states that
A. the farther away a star is from us, the less its luminosity. B. the farther away a star is from us, the less its velocity of recession. C. the farther away a star is from us, the greater its velocity of recession. D. the nearer to us a star is, the greater its velocity of recession.
A long straight wire (diameter = 2.0 mm) carries a current of 25 A. What is the magnitude of the magnetic field 0.50 mm from the axis of the wire?
a. 5.0 mT b. 10 mT c. 0.63 mT d. 2.5 mT e. 0.01 mT