A piece of wood measures 16 inches by 12 inches and has a volume of 532 cubic inches. How many inches thick, to the nearest hundredth is the wood?
What will be an ideal response?
2.77 inches
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A 220V, 1500 rpm, 11.6A (armature current) separately excited motor is controlled by a single-phase, full wave SCR converter. The armature resistance of the motor is 2 ?. The ac source voltage is 230 V (rms) 60 Hz. Enough filtering inductance is added to ensure continuous conduction for any torque greater than 25% of the rated value. You may ignore the rotational losses. What should be the value of the firing angle (triggering angle) to drive a mechanical load of rated torque at 1000 rpm?
What will be an ideal response?
Technician A says that two U-joints are used on a driveshaft to prevent vibration. Technician B says that the more equal the U-joint angles, the less chance of driveshaft vibration. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
Carpenters may use a rafter table to find the length of rafters.
Answer the following statement true (T) or false (F)
Refer to Exercise 19. Assume that for a certain bacterium, r = 0.8 ± 0.1 ????m and h = 1.9 ± 0.1 ????m.
a. Estimate S, and find the relative uncertainty in the estimate. b. Estimate V, and find the relative uncertainty in the estimate. c. Estimate R, and find the relative uncertainty in the estimate. d. Does the relative uncertainty in R depend on c?