If a vector pointing upward has a positive magnitude, a vector pointing downward has a negative magnitude
A) True
B) False
B
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Suppose the resistor is rotated so that its axis is aligned with the flow. What is the maximum permissible power dissipation?
GIVEN
• A heat generating resistor disk with its axis aligned with a cooling airflow
• Heat generation rate ( Q
G) = 2.5 W
• Disk diameter (D) = 1 cm = 0.01 m
• Disk thickness (t) = 0.6 mm = 0.0006 m
• Air temperature (T?) = 30°C
• Air velocity (U?) = 10 m/s
• Maximum surface temperature (Ts) = 90°C FIND
• The maximum permissible power dissipation ( Q G)
ASSUMPTIONS
• Heat transfer from the edges is negligible
• The heat flux is equal from both faces
SKETCH
The most recent evidence from the use of Type Ia supernovae as standard candles says that
a) the universe is decelerating b) the universe is accelerating c) the universe is closed d) the cosmological constant is zero e) the universe is stationary
A highway curve of radius 100 m, banked at an angle of 45°, may be negotiated without friction at a speed of
A) 22 m/s. B) 31 m/s. C) 44 m/s. D) 67 m/s.
Sort the following steps into the correct sequence in which life evolved on Earth.
What will be an ideal response?