That matter is composed of quarks was first proposed by
A. Blatt and Weiskopf.
B. Gell-Mann and Zweig.
C. Rutherford and Geiger.
D. Bardeen and Cooper.
E. Feynman and Schwinger.
B. Gell-Mann and Zweig.
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An electrical transmission line of 1.2 cm diameter carries a current of 200 Amps and has a resistance of 3 × 10–4 ohm per meter of length. If the air around this line is at 16°C, determine the surface temperature on a windy day, assuming a wind blows across the line at 33 km/h.
GIVEN
• An electrical transmission line on a windy day
• Line outside diameter (D) = 12 cm = 0.012 m
• Current (I) = 200b Amps
• Resistance per unit length (Re/L) = 3 × 10–4 ohm/m
• Air temperature (Tb) = 16°C
• Air velocity (V) = 33 km/h = 9.17 m/s
FIND
• The line surface temperature (Ts) ASSUMPTIONS
• Steady state conditions
• Air flow approaching line has low free-stream turbulence
SKETCH
PROPERTIES AND CONSTANTS
Thermal conductivity (k) = 0.0248 W/(m K) Kinematic viscosity (?) = 15.3 × 10–6 m2/s Prandtl number (Pr) = 0.71
Alex throws a .15kg rubber ball. The speed just before impact is 6.5 m/s and just after impact is 3.5 m/s. What is the change in the magnitude of the ball's momentum
A. 0.09 kg*m/s B.1.5 kg*m/s C. 4.3 kg*m/s D. 4.3 kg*m/s I can't figure out a formula or how to solve.
Galileo Galilei
A) developed a theory of gravity to explain the motions of the planets B) obtained the first observational evidence suggesting the Earth moved about the Sun C) showed that the orbits of the planets were ellipses and not circles D) made detailed measurements of the motions of the planets in the sky
The heating element in an electric drier operates on 240. V and generates heat at the rate of 2.00 kW. The heating element shorts out and, in repairing it, the owner shortens the Nichrome wire by 10%
(Assume the temperature is unchanged, although in reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element?