A nonrelativistic proton is confined to a length of 2.0 pm on the x-axis
What is the kinetic energy of the proton if its speed is equal to the minimum uncertainty possible in its speed? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s, mproton = 1.67 × 10-27 kg)
A) 5.1 eV
B) 51 eV
C) 510 eV
D) 5100 eV
E) 51,000 eV
B
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DNA molecules contain patterns for the production of
a. proteins. b. amino acids. c. phosphates and sugars. d. four kinds of bases. e. all of the above
Compare the rate of heat transfer and the pressure drop for an in-line and a staggered arrangement of a tube bank consisting of 300 tubes, 1.8 m long and 2.5 cm OD. The tubes are to be arranged in 15 rows with longitudinal and transverse spacing of 5 cm. The tube surface temperature is 95°C and water at 35°C is flowing at a mass rate of 5400 kg/s over the tubes.
GIVEN
Water flowing over an in-line and a staggered tube bank
Number of tubes (Nt) = 300
Length of tubes (L) = 1.8 m
Tube outside diameter (D) = 2.5 cm= 0.025 m
Number of rows (N) = 15
Normal and parallel spacing = 5 cm=0.05 m
Tube surface temperature (Tt) = 95°C
Water inlet temperature (Tw,in) = 35°C
Mass flow rate of water (m) = 5400 kg/s
FIND
(a) Compare the rate of heat transfer (q) and
(b) The pressure drop ( ?p) for the two configurations
ASSUMPTIONS
Steady state
Tube temperature is uniform
SKETCH
PROPERTIES AND CONSTANTS
for water at the inlet temperature of 35°C
Density (?) = 994.1 kg/m3
Thermal conductivity (k) = 0.624 W/(m K)
Prandtl number (Pr) = 4.8
Specific heat (c) = 4175 J/(kg K)
At the tube temperature of 95°C
Prs = 1.88
Which of the following is not a fundamental force?
a. the gravitational force b. the electromagnetic force c. the strong force d. the force of forward motion also known as the inertial force e. Choose this answer if two of the named forces are not fundamental.
Protoplanets
a. grew in size primarily by accretion. b. grew in size primarily by condensation. c. are still visible today as the terrestrial planets. d. grew in size by collecting the particles in the solar wind. e. grew in size by the collision and coalescing of planetesimals.