The speed of sound at 0°C is 331 m/s. What is the speed of sound at 32°C? (0°C = 273 K)
a. 346 m/s
c. 343 m/s
b. 356 m/s
d. 350 m/s
D
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Two parallel disks shown in the figure have emissivity of 0.6. If one of the disks is at 200ºC and the other one is at 30ºC, (a) determine the net heat transfer between the two disks if the surroundings re-radiate heat and (b) determine the net heat transfer between the two disks if the surroundings are a black body at 20ºC.
Potential of Point-Charges: A square is 1.0 m on a side. Point charges of +4.0 ?C are placed in two diagonally opposite corners. In the other two corners are placed charges of +3.0 ?C and -3.0 ?C. What is the potential (relative to infinity) at the midpoint of the square? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 1.0 × 104 V B. 1.0 × 105 V C. 1.0 × 106 V D. 0 V E. infinite
How can astronomers be confident that the larger exoplanets discovered are not simply brown dwarfs?
What will be an ideal response?
A bimetallic strip is usable as a thermometer because of the property of __________
Fill in the blank(s) with correct word