A Young's double-slit apparatus is set up where a screen is positioned 1.2 m from the double slits. If the distance between alternating bright fringes is 0.83 cm, and the light source has a wavelength of 579 nm, what is the separation of the double slits? (1 nm = 10?9 m)
a. 1.2E–2 m
b. 8.4E–5 m
c. 7.0E–6 m
d. 9.0E–5 m
e. 4.0E–9 m
b
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In a biomedical processing plant, a newly developed liquid drug or medication that leaves a mixing chamber at 20°C needs to be heated to 70°C in a thermal curing process. This is achieved by heating the liquid media at the rate of 10 kg/h in a thin metallic circular pipe with a 10 mm inner diameter that is electrically heated by wrapping it in resistance wire and insulation. If the tube surface is heated with a constant heat flux of 5,100 W/m2, calculate the length of tubing needed for this heat exchange device and the inner surface temperature of the pipe at its exit. Assume fully developed convection, and verify this assumption after calculating the length. The physical properties of the fluid media are considered as follows: Cp= 4.0 kJ/(kg K), k= 0.5 W/(m K), ?= 0.002 Ns/m2, and
?=1000 kg/m3 GIVEN • Diameter of copper tube (Di)= 10 mm = 0.01 m • Cooling water inlet temperature (Tin)= 200C • Cooling water flow rate ( m• )=10 kg/hr = 2.78*10-3 kg/s • Cooling water outlet temperature (Tout)= 700C • Surface heat flux(q’’) = 5100 W/m2 FIND (a) Length of tubing needed for this heat exchange device. (b) Inner surface temperature of pipe at exit. PROPERTIES AND CONSTANTS Given, for the fluid Density (?) = 1000 kg/m3 Specific heat (cp) = 4000 J/(kg K) Thermal conductivity (k) = 0.5 W/(m K) Absolute viscosity (?) = 0.002 (Ns)/m2
Calculate the minimum average power output necessary for a 55.8 kg person to run up a 12.0 m long hillside, which is inclined at 25.0° above the horizontal, in 3.00 s. You can neglect the person's kinetic energy. Express your answer in horsepower
(1 hp = 746 W) A) 1.24 hp B) 2.93 hp C) 1.86 hp D) 0.740 hp
Which of the following represents one of the major splits in physical science before and after about 1895?
At Titan, the lakes are made mostly of liquid
A) metallic hydrogen. B) nitrogen. C) carbon dioxide. D) methane. E) water.