Exhibit 12-1
The figure below shows a graph of angular velocity versus time for a woman bicycling around a circular track.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 12-1. How many revolutions does she complete in the 16-minute period?
A. 8
B. 12
C. 16
D. 20
E. 40
Answer: D
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The solar winds blow outward from:
A) sunspots. B) flares. C) the entire photosphere. D) coronal holes. E) the Sun's poles only.
______________ is the symbol for the universal gravitational constant
Fill in the blank(s) with correct word
A series circuit consists of three identical lamps connected to a battery as shown in Figure OQ28.15. The switch S, originally open, is closed. What happens to the potential difference across lamp C?
In a metal wire manufacturing facility, continuously drawn copper wire with a 2.5 mm diameter is annealed by heating it from its initial temperature of 450C to 400oC in a soaking oven. The oven inside air temperature is 7000C with an average heat transfer coefficient of ch =45 W/(m2 K). Estimate the soaking annealing time required. Also if the oven is 3.5 m long and the drawn wire is continuously fed through the oven (entering at one end and pulled out at the other longitudinal end), what should be the drawing speed or velocity?
GIVEN
• Copper wire with diameter (D)= 2.5 mm=0.0025 m
• Initial temperature of the wire(To) = 45°C
• Oven air temperature(T?) = 700°C
• Heat transfer coefficient ( ch ) = 45 W/(m2 K)
• Length of the oven(L)=3.5 m
FIND
• The soaking annealing time required for the wire to 400°C
• Drawing speed through the oven(v)
ASSUMPTIONS
• Constant thermal conductivity
• End effects are negligible
• The wire is very long compared to its diameter
• There is radial conduction only in the wire
SKETCH
