What is the speed of a proton that has been accelerated from rest through a potential difference of 4.0 kV?
A. 1.1 × 106 m/s
B. 9.8 × 105 m/s
C. 8.8 × 105 m/s
D. 1.2 × 106 m/s
E. 6.2 × 105 m/s
Answer: C
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A long 0.6-m-OD 347 stainless steel (k = 14 W/(m K)) cylindrical billet at 16°C room temperature is placed in an oven where the temperature is 260°C. If the average heat transfer coefficient is 170 W/(m2 K), (a) estimate the time required for the center temperature to increase to 232°C by using the appropriate chart and (b) determine the instantaneous surface heat flux when the center temperature is 232°C. but assume that the billet is only 1.2-m-long and the average heat transfer coefficient at both ends is 136 W/(m2 K).
GIVEN
• A cylindrical billet placed in an over
• Billet outside diameter = 0.6 m
• Thermal conductivity (k) = 14 W/(m K)
• Initial temperature (To) = 16°C
• Oven temperature (T?) = 260°C
• The average heat transfer coefficient h cs = 170 W/(m2 K)
• Increase of the center temperature is 232°C
• Billet length (2L) = 1.2 m
• Heat transfer coefficient at the ends h ce = 136 W/(m2 K)
FIND
• The time required using the appropriate charts
ASSUMPTIONS
• Two dimensional conduction within the billet
• Constant and uniform thermal properties
• Constant oven temperature
SKETCH
The radius of the Moon's orbit is about ____ times larger than the radius of Earth
a. 0.6 b. 6 c. 60 d. 600 e. 6000
First Law of Thermodynamics: A certain gas is compressed adiabatically. The amount of work done on the gas is 800 J. What is the change in the internal (thermal) energy of the gas?
A. 800 J B. -800 J C. 400 J D. 0 J E. More information is needed to answer this question.
Which of the following statements is incorrect?
What will be an ideal response?