How many inches are represented by 7 degrees on the rim of a 9-inch diameter flywheel? Round to the nearest hundredth.
A. 0.53
B. 0.55
C. 0.57
D. 0.59
Answer: B
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Ammeters should be connected ________ with the circuit being tested.
A) Across a load B) In parallel C) In series D) None of these
In the article “Measurements of the Thermal Conductivity and Thermal Diffusivity of Polymer Melts with the Short-Hot-Wire Method”, the thermal diffusivity of a liquid measured by the transient short-hot-wire method is given by
where? is the thermal diffusivity; V and I are the voltage and current applied to the hot wire, respectively; l is the length of the wire; and A and a are quantities involving temperature whose values are estimated separately. In this article, the relative uncertainties of these quantities are given as follows: V, 0.01%; I, 0.01%; l, 1%; A, 0.1%; a, 1%.
a. Find the relative uncertainty in ?.
b. Which would reduce the relative uncertainty more: reducing the relative uncertainty in l to 0.5% or reducing the relative uncertainties in V, I, and A each to 0?
Which of the following conditions will cause a hacksaw blade to dull quickly?
A) No pressure on the return stroke B) Too short a saw blade C) Too fast sawing speed D) Too slow sawing speed
Which of the following will apply to the largest resistor in a series circuit?
A) Has the greatest voltage drop B) Has the largest current going through it C) Has a voltage drop equal to the other resistors in the circuit D) Dissipates the least amount of power