Two masses, A and B, are attached to different springs. Mass A vibrates with an amplitude of 8 cm at a frequency of 10 Hz and mass B vibrates with an amplitude of 5 cm at a frequency of 16 Hz
How does the maximum speed of A compare to the maximum speed of B? A) Mass A has the greater maximum speed.
B) Mass B has the greater maximum speed.
C) They are equal.
C
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The lowest of low tides occurs during neap tides
a. True b. False Indicate whether the statement is true or false
Kinetic Energy: If, instead of the correct formula for kinetic energy, we carelessly use the classical expression for kinetic energy for a particle moving at half the speed of light, by what magnitude percent will our calculation be in error? (c = 3.0 × 108 m/s)
A. 24% B. 19% C. 27% D. 7% E. 1%
Water at a rate of 0.32 L/s and a temperature of 27°C enters a No. 18 BWG 1.6 cm condenser tube made of nickel chromium steel ( k = 26 W/(m K) ) . The tube is 3 m long and its outside is heated by steam condensing at 50°C. Under these conditions, the average heat transfer coefficient on the water side is 10 kW/(m2 K), and the heat transfer coefficient on the steam side may be taken as 11.3 kW/(m2 K). On the interior of the tube, however, there is a scale having a thermal conductance equivalent to 5.6 kW/(m2 K). (a) Calculate the overall heat transfer coefficient U per square meter of exterior surface area. (b) Calculate the exit temperature of the water.
GIVEN
• A nickel chromium steel condenser tube with water inside and condensing steam outside
• Water flow rate v
= 0.32 L/s= 3.2*10-4 m3/s
• Water inlet temperature (Tw,in) = 27°C
• Tube: No. 18 BWG 1.6 cm
• Steel thermal conductivity (kst) = 26 W/(m K)
• Tube length (L) = 3 m
• Steam temperature (Ts) = 50°C
• Average water- side transfer coefficient ( )ih = 10 kW/(m2 K)
• Average steam transfer coefficient ( )oh = 11.3 kW/(m2 K)
• Interior scaling conductance (1/Ri) = 5.6 kW/(m2 K)
FIND
(a) The overall heat transfer coefficient (U) based on exterior surface area
(b) The outlet water temperature (Tw,in)
SKETCH
PROPERTIES AND CONSTANT
for No. 18 BWG 1.6 cm tube
Inside Diameter (Di) = 1.34 cm
Outside Diameter (Do) = 1.6 cm
the density of water at 30°C (?) = 995.7 kg/m3;
the specific heat (cpw) = 4176 W/(kg K)
Energy provided directly from Earth's interior is called
a. groundwater energy. b. geothermal energy. c. artesian energy. d. thermionic energy.