The upward force exerted by a fluid on an object immersed in it is called __________
Fill in the blank(s) with correct word
buoyant force
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Determine the effect of forced convection on heat transfer from an incandescent lamp. What would be the glass temperature be for air velocities of 0.5, 1, 2, and 4 m/s?
GIVEN
• A spherical glass light bulb in air
• Bulb power consumption (P) = 100 W
• 10% of energy is in the form of visible light
• Diameter (D) = 10 cm = 0.1 m
• Bulb emissivity (?) = 0.85
• Ambient air temperature (T?) = 20°C = 293 K FIND
• The glass temperature (Ts) for air velocities (U?) of 0.5, 1, 2, and 4 m/s ASSUMPTIONS
• The bulb has reached steady state
• The surrounding behave as a black body at T?
SKETCH
PROPERTIES AND CONSTANTS
Thermal conductivity (k) = 0.025 W/(m K)
Kinematic viscosity (?) = 15.7 × 10–6 m2/s
Prandtl number (Pr) = 0.71
A ruby laser can deliver a 4.33-J pulse in approximately 50 nanoseconds. The wavelength of the light is 694 nm. At least how many atoms within the ruby rod had to be excited to allow this high-energy laser pulse? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 eV = 1.6 × 10^?19 J, and 1 nm = 10?9 m)
a. 3.5E+18 b. 3.0E+17 c. 1.5E+19 d. 1.5E+21 e. 1.1E+18
Two taut strings of identical mass per unit length are stretched with the same tension with their ends fixed, but one string is 0.330 cm longer than the other. Waves on these strings propagate at 34.0 m/s
The fundamental frequency of the shorter string is 258 Hz. What is the beat frequency when each string is vibrating at its fundamental frequency? A) 12.3 Hz B) 9.00 Hz C) 12.0 Hz D) 12.7 Hz E) 11.3 Hz
A 
cm rectangular piece of copper is at a temperature of 10.0
The coefficient of linear expansion of copper is 
If the temperature of the copper rectangle increases its temperature by 2.00
then what is the change in the area of the rectangular piece of copper?
A. 
B. 
C. 
D. 
E. 