If a proton with mass 1.67 × 10^?27 kg moves in an accelerator such that its total energy is three times its rest energy, what is its speed? (c = 3.00 × 10^8 m/s)
a. 2.83 × 10^8 m/s
b. 2.45 × 10^8 m/s
c. 2.00 × 10^8 m/s
d. 1.00 × 10^8 m/s
e. 1.54 × 10^8 m/s
a
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Determine the outlet temperature of oil for the same initial temperatures of the fluids if the flow arrangement is one shell pass and two tube passes, but with the same total area and average overall heat transfer coefficient as the unit in
• Water cooling oil in a tube and shell heat exchanger
• Water flow rate ( m
w)= 1.25 kg/s
• Oil flow rate ( m
o)= 2.5 kg/s
• Oil specific heat (cpo) = 2093 J/(kg K)
• Water inlet temperature: (Tw,in) = 15°C
• Oil inlet temperature: To,in = 95°C
• Overall heat transfer coefficient (U) = 280 W/(m2 K)
• One shell and two tube passes
• Same surface area as Problem 10.23: A = 11.2 m2
FIND
• The oil outlet temperature (To,out)
SKETCH
PROPERTIES AND CONSTANTS
the specific heat of water (cpw) = 4187 W/(kg K)
Compton Scattering: X-rays of energy 3.5 × 104 eV scatter through an angle of 105° off of a free electron. What is the energy (in eV) of the scattered x-rays? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
Fill in the blank(s) with the appropriate word(s).
Latent Heats: A metal has a latent heat of fusion of 2.32 × 104 J/kg, a specific heat of 128 J/kg ? K, and a melting point of 228°C. A 30-g pellet of this metal at 16°C hits a solid wall and comes to a complete stop. What would the speed of the pellet have to be in order for it to melt completely when it hits the wall, assuming that all of its kinetic energy is transformed into heat within the pellet?
A. 207 m/s B. 215 m/s C. 232 m/s D. 273 m/s E. 317 m/s
Why do some people think that cogeneration is a useful strategy for dealing with energy generation? Explain
What will be an ideal response?