A nonrelativistic proton is confined to a length of 2.0 pm on the x-axis. What is the kinetic energy of the proton if its speed is equal to the minimum uncertainty possible in its speed? (1 eV = 1.60 × 10-19 J, h = 1
055 × 10-34 J ? s, mproton = 1.67 × 10-27 kg)
A) 5200 eV B) 5.2 eV C) 520 eV D) 0.52 eV E) 52 eV
B
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Saturated steam at 34 kPa condenses on a 1-m-tall vertical plate whose surface temperature is uniform at 60°C. Compare the average heat transfer coefficient and the value of the coefficient 1/3, 2/3, and 1 m from the top. Also, find the maximum plate height for which the condensate film will remain laminar.
GIVEN
? Saturated steam condensing on a vertical plate
? Steam pressure (p) = 34 kPa
? Plate height (L) = 1 m
? Plate surface temperature (Ts) = 60°C (uniform)
FIND
(a) The average heat transfer coefficient (hc)
(b) The local heat transfer coefficient (h?) at x = 1/3 L, 2/3 L, and L
(c) The maximum height for which the condensate film will remain laminar
ASSUMPTIONS
? Steady state
? Film condensation occurs
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for saturated water at 34 kPa
Consider an RLC series circuit. The impedance of the circuit increases if XC increases
A) true only if XL is greater than or equal to XC B) true only if XL is less than or equal to XC C) always true D) never true
Spiral galaxies have more gas, dust, and young stars than elliptical galaxies
Indicate whether the statement is true or false
If the volume of an object were to be halved with the same mass, its density would
a. halve b. double c. stay the same