What mechanism is most responsible for generating the internal heat of Io that drives volcanic activity?
A) accretion
B) radioactive decay
C) differentiation
D) tidal heating
E) bombardment
D) tidal heating
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In a helium-neon laser the emissions occur from transitions between two excited states in neon, one being at 20.66 eV above the ground state and the other being 18.70 eV above ground. What is the energy of the photons emitted by this laser?
A) 20.66 eV B) 1.96 eV C) 18.70 eV D) 19.60 eV E) 39.36 eV
Which of the following is that form of energy associated with an object's location in a conservative force field?
a. potential b. thermal c. bio-chemical d. kinetic
A miniature heat sink heat exchanger is constructed with circular cross section channels (similar to that in Example 7.4), each of which has a diameter of 3.0 mm, drilled through a rectangular block. Cooling water at 20°C flows at the rate of 0.5 kg/h through each circular pipe, which has a constant surface temperature of 80°C. Assuming fully developed velocity and temperature distribution conditions, determine the length of the drilled pipe if the outlet water temperature is 60°C. Also, based on your calculations, verify the fully developed condition assumption.
GIVEN • Heat exchanger constructed with circular cross section channels. • Diameter of channel (Di)= 3 mm = 3*10-3 m • Cooling water inlet temperature (Tin)= 200C • Cooling water flow rate (m• )=0.5 kg/h = 1.39*10-4 kg/s • Cooling water outlet temperature (Tout)= 600C • Surface temperature(Ts)=800C FIND (a) Length of the drilled pipe. (b) Verify fully developed condition assumption PROPERTIES AND CONSTANTS or Water at 60°C: Density (?) = 982.8 kg/m3 Specific heat (cp) = 4182.8 J/(kg K) Thermal conductivity (k) = 0.657 W/(m K) Absolute viscosity (?) = 483.7 × 10–6 (Ns)/m2 Prandtl Number (Pr) = 3.02
In general, sound is conducted fastest through
A) gases. B) liquids. C) solids. D) a vacuum.