A postulate of special relativity is that the speed of light
A) like all motion, is relative.
B) for all observers is a constant.
C) both of these
D) neither of these
Answer: B
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The electric field strength in the space between two closely spaced parallel disks is 1.0 × 105 N/C. This field is the result of transferring 3.9 x 109 electrons from one disk to the other
What is the diameter of the disks? (e = 1.60 × 10-19 C, ?0 = 8.85 × 10-12 C2/N • m2) A) 3.0 cm B) 1.5 cm C) 4.5 cm D) 6.0 cm
A force of 7.2 N acting on a 1.0-kg object initially at rest moves it through a parallel distance of 2.5 m. Neglecting friction, what is the speed of the object when it is moved 2.5 m?
Using the information estimate the ambient air temperature that could cause frostbite on a calm day on the ski slopes.
GIVEN
• Skier’s skin of thickness (L) = 3 mm = 0.003 m exposed to cold air
• Inner surface temperature of skin (Tsi) = 35°C
• Thermal conductivity of skin (k) = 0.35 W/(m K)
• Convective heat transfer coefficient in still air ( ch ) = 20 W/(m2 K)
• Frostbite occurs at an outer skin surface temperature (Tso) = 10°C FIND
• The ambient air temperature (T?) that could cause frostbite ASSUMPTIONS
• Steady state conditions prevail
• One dimensional conduction occurs through the skin
• Radiative loss (or gain from sunshine) is negligible
SKETCH
Magnetic field strength inside a current-carrying coil will be greater if the coil encloses a
A) vacuum. B) wooden rod. C) glass rod. D) rod of iron. E) none of the above