A proton moving along the x axis has an initial velocity of 4.0 × 10^6 m/s and a constant acceleration of 6.0 × 10^12 m/s2 . What is the velocity of the proton after it has traveled a distance of 80 cm?
a. 5.1 × 10^6 m/s
b. 6.3 × 10^6 m/s
c. 4.8 × 10^6 m/s
d. 3.9 × 10^6 m/s
e. 2.9 × 10^6 m/s
A
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In a shell-and-tube heat exchanger with h i= h o= 5600 W/(m2 K) and negligible wall resistance, by what per cent would the overall heat transfer coefficient (based on the outside area) change if the number of tubes was doubled? The tubes have an outside diameter of 2.5 cm and a tube wall thickness of 2 mm. Assume that the flow rates of the fluids are constant, the effect of temperature on fluid properties is negligible, and the total cross sectional area of the tubes is small compared to the flow area of the shell.
GIVEN
• Shell and tube heat exchanger
• Heat transfer coefficients: h i= h o= 5600 W/(m2 K)
• Negligible wall resistance
• Tube outside diameter (Do) = 2.5 cm = 0.025 m
• Tube wall thickness (t) = 2 mm = 0.002 m
FIND
• The per cent change in the overall heat transfer coefficient if the number of tubes is doubled
ASSUMPTIONS
• Flow rates of the fluids are constant
• The effect of temperature of fluid properties is negligible
• The fluid flow is turbulent in the tubes (this is consistent with the high heat transfer coefficients)
SKETCH
A velocity selector for ions uses perpendicular electric and magnetic fields. If the electric field used were 800 V/m, what magnetic field would allow the selection of a velocity of 4000 m/s?
A. 0.0400 T B. 0.0800 T C. 0.160 T D. 0.200 T E. 0.500 T
The Sun's rate of fusion is gradually increasing over time
Indicate whether the statement is true or false
The static friction force on an object
A. can never be greater than the kinetic friction force on it under the same circumstances. B. can never accelerate the object. C. can never be greater than the normal force on it. D. can never be greater than the object's weight. E. None of the choices are correct.