A block of wood and a block of copper will feel neither hot nor cold to the touch when they each have
A) equal temperatures.
B) your temperature.
C) equal conductivities.
D) none of the above
B) your temperature.
You might also like to view...
A tungsten filament is heated to 2700 K. At what wavelength is the maximum amount of radiation emitted? What fraction of the total energy is in the visible range (0.4 to 0.75 ?m)? Assume that the filament radiates as a gray body.
GIVEN
• Heated tungsten filament
• Filament temperature (Tf) = 2700 K
FIND
(a) Wavelength at which the maximum radiation is emitted (?max)
(b) Percentage of radiation in the visible ranger (0.4 to 0.75 ?m)
ASSUMPTIONS
• The filament radiates as a gray body
SKETCH
The vector sum of three co-planar forces
A. must be zero. B. must be perpendicular to one of the three. C. must be parallel to one of the three. D. must be perpendicular to the plane. E. may have any direction in the plane.
What is the mass of a ball moving at 3 m/s with a momentum of 48 kg?m/s?
A) 4 kg B) 12 kg C) 16 kg D) 144 kg E) none of these
A child on a sled starts from rest at the top of a 15° slope. If the trip to the bottom takes how long is the slope? Assume that frictional forces may be neglected
A) 293 m B) 586 m C) 1130 m D) 147 m