A particle (charge = Q) is kept in a fixed position at point P, and a second particle (charge = q) is released from rest when it is a distance R from P. If Q = +2.0 mC, q = ?1.5 mC, and R = 30 cm, what is the kinetic energy of the moving particle after it has moved a distance of 10 cm?
a. 60 kJ
b. 45 kJ
c. 75 kJ
d. 90 kJ
e. 230 kJ
b
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Water freezes at 273 on the ________ scale.
A. Kelvin B. Fahrenheit C. Rankin D. Celsius E. Vernier
Water enters a small copper tube, with an inner diameter of 2.5 cm, at the rate of 0.025 kg/s and a temperature of 15°C. Steam is condensing on the outer surface of the tube at atmospheric pressure so that tube-surface temperature is uniformly at 100°C. If the tube length is 5 meters, determine (a) the outlet temperature, and (b) the average convection heat transfer coefficient between the water and the pipe.
GIVEN • Diameter of copper tube (Di)= 2.5 cm = 0.025 m • Cooling water inlet temperature (Tin)= 200C • Cooling water flow rate ( m• )=0.025 kg/s • Tube length (L)= 5 m • Surface temperature(Ts)=1000C FIND (a) Outlet temperature (b) Average convection heat transfer coefficient between water and pipe. PROPERTIES AND CONSTANTS for Water at 35°C: (guess bulk temperature) Density (?) = 994.1 kg/m3 Specific heat (cp) = 4175 J/(kg K) Thermal conductivity (k) = 0.624 W/(m K) A bsolute viscosity (?) = 719.8 × 10–6 (Ns)/m2 Prandtl Number (Pr) = 4.8
One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900°C; exhaust temperature = 430°C. 7.0 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour
What is the power output, in hp, of this engine?
If a cup of tea at room temperature, 24°C is heated until it has twice the internal energy, unlike a piece of metal, its temperature will be
A) 48°C. B) 100°C. C) 321°C. D) 594°C. E) none of the above