The New Horizons probe carries what kind of physical time capsule?
A) a small engraved plaque
B) a gold-plated record containing pictures, multilingual greetings and music
C) a DVD containing pictures
D) this probe does not carry a physical time capsule but a message will eventually be uploaded to its computers
D
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Purified water, flowing at the rate of 45 kg/h is to be heated from 25°C to 75°C in a food processing plant before it is mixed with thickened tomato puree for sauce production. A thin-walled, 1.25 cm diameter, stainless steel tube is used, which is maintained at a constant surface temperature of 175°C by immersing it in a hot mineral bath. Calculate the length of tubing required and determine whether the forced convection inside the tube is fully developed or has entrance effects. Also, what is the frictional loss?
GIVEN • Diameter of steel tube (Di)= 1.25 cm = 0.0125 m • Cooling water inlet temperature (Tin)= 250C • Cooling water flow rate ( m• )=45 kg/h=0.0125 kg/h • Water outlet temperature (Tout)= 750C • Surface temperature(Ts)=1750C FIND (a) Length of tubing required. (b) whether the forced convection inside tube is fully developed or has entrance effects PROPERTIES AND CONSTANTS Density (?) = 988.1 kg/m3 Specific heat (cp) = 4178 J/(kg K) Thermal conductivity (k) = 0.647 W/(m K) Absolute viscosity (?) = 555.1 × 10–6 (Ns)/m2 Prandtl Number (Pr) = 3.55
The mass of 6 million atoms of a diatomic gas is 
What is the atomic mass of this gas?
A. 25.5 u B. 51.0 u C. 2.55 u D. 5.10 u
When light scatters from a rough surface, the law 
A. does not hold. B. holds on average, with reflected light from the surface leaving in the average direction of reflection. C. applies to each small relatively flat area of surface individually. D. applies only when the particle aspect of light predominates. E. applies only when the wavelength of light is greater than 800 nm but less than 2000 nm.
A stone is thrown downward from a tall cliff and hits the ground below. If it were instead thrown straight upward with the same initial speed, it would end up striking the ground below (neglect air resistance) with
1) the same speed. 2) less speed. 3) greater speed. If air resistance IS a factor, then when the stone is moving downward it will undergo 4) an increase in acceleration as velocity increases. 5) a decrease in acceleration as velocity increases. 6) a constant acceleration.