Conversion of Units: The tank of a certain car holds 16 gallons of gasoline. (1.00 gal = 3.785 L)(a) How many liters of gasoline does this tank hold?(b) How many kilometers can the car travel on one tank if it gets 25 miles per gallon?
Fill in the blank(s) with the appropriate word(s).
(a) 61 L (b) 640 km
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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
In terms of energy levels of electrons, a potential well has
a. a negative value. b. a positive or a negative value. c. a positive value. d. none of these.
The greenhouse effect occurs on Earth because carbon dioxide is
a. transparent to visible light and opaque to infrared radiation. b. opaque to visible light and transparent to infrared radiation c. totally opaque to both visible light and infrared radiation d. totally opaque to both visible light and infrared radiation
For the ground state of the hydrogen atom, which of the following represents the correct value of the orbital angular momentum quantum number?
A) -1 B) 1 C) 0 D) 2 E) -2