How many time constants must elapse if an initially charged capacitor is to discharge 55% of its stored energy through a resistor?
a. 0.60
b. 0.46
c. 0.52
d. 0.40
e. 1.1
d
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A composite beam of aluminum (Ea 5 72 GPa) and steel (Es 5 190 GPa) has a width b 5 25 mm and heights ha 5 42 mm and hs 5 68 mm, respectively. A bending moment is applied about the z axis resulting in a maximum stress in the aluminum of 55 MPa. The maximum stress in the steel is approximately:
(A) 86 MPa
(B) 90 MPa
(C) 94 MPa
(D) 98 MPa
High-mass stars have ________ lifetimes than low-mass stars.
A) much shorter B) slightly shorter C) much longer D) slightly longer
A harmonic wave has a wavelength of 2.0 m and a frequency of 5.0 Hz. What is the speed of the wave?
A) 10 m/s B) 0.40 m/s C) 0.50 m/s D) 0.10 m/s E) 2.5 m/s
The maximum volume of sediment a stream can carry is dependent on the stream's
A) laminar flow. B) velocity. C) discharge. D) channel geometry.