The safety fuse in an electric circuit is connected to the circuit in
A) series.
B) parallel.
C) either series or parallel.
Answer: A
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By what factor is the self-inductance of an air solenoid changed if only its cross-sectional area, A, multiplied by eight?
a. 1/8 b. 8 c. 24 d. 64 e. 1/64
A composite beam is made up of a 90 mm 3 160 mm wood beam (Ew 5 11 GPa) and a steel bottom cover plate (90 mm 3 8 mm, Es 5 190 GPa). Allowable stresses in wood and steel are 6.5 MPa and 110 MPa, respectively. The allowable bending moment about the z axis of the composite beam is most nearly:
(A) 2.9 kN?m
(B) 3.5 kN?m
(C) 4.3 kN?m
(D) 9.9 kN?m
A simple pendulum, 2.0 m in length, is released by a push when the support string is at an angle of 25° from the vertical. If the initial speed of the suspended mass is 3.0 m/s when at the release point, to what maximum angle will it move in the second half of its swing?
a. 36° c. 19° b. 30° d. 47°
Which is higher in an endothermic reaction: the potential energy of the reactants or the potential energy of the products?
A) The potential energy of the products is higher than the potential energy of the reactants. B) The potential energy of the reactants is higher than the potential energy of the products. C) The potential energy of the reactants is the same as the potential energy of the products. D) In the early stages of the reaction the potential energy of the reactants is higher. In the later stages, the potential energy of the products is higher.