The current-versus-voltage behavior of a certain electrical device is shown in Figure OQ27.3. When the potential difference across the device is 2 V, what is its resistance?
1
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An astronaut measures her mass by means of a device consisting of a chair attached to a large spring. The period of oscillation she undergoes when set into motion is used to determine her mass. If her mass together with the chair is 172 kg and the time required for her to undergo 10 full oscillations is 27 seconds, what is the spring constant?
A. 400 N/m B. 931 N/m C. 148 N/m D. 467 N/m
Specific heat (c) is the heat capacity per unit _____________.
Fill in the blank(s) with the appropriate word(s).
Propped cantilever beam AB has moment M1 applied at joint B. Framework ABC has moment M2 applied at C. Both structures have con-stant flexural rigidity EI. If the ratio of the applied moments M1/M2 5 3/2, the ratio of the joint rotations at B, ?B1/?B2, is approximately:
(A) 1
(B) 3/2
(C) 2
(D) 5/2
While examining the spectrum of a galaxy you find all the hydrogen lines are shifted to longer wavelengths. This galaxy is:
A) moving away from us. B) moving towards us. C) expanding explosively. D) blue shifted. E) not forming new stars.