An object is dropped from a height. Once it is moving, which of the following statements is true, at least at one point?
a. Its velocity is more than its acceleration.
b. Its velocity is less than its acceleration.
c. Its velocity is the same as its acceleration.
d. Its velocity is never equal to its acceleration.
d
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Estimate the heat transfer coefficient for liquid sodium at 540°C flowing over a 10-row staggered-tube bank of 2.5 cm-diameter tubes arranged in an equilateral- triangular array with a 1.5 pitch-to-diameter ratio. The entering velocity is 0.6 m/s, based on the area of the shell, and the tube surface temperature is 200°C. The outlet sodium temperature is 310°C.
GIVEN
FIND
Estimate the heat transfer coefficient (c h)
ASSUMPTIONS
Steady state
The correlation can be applied to a pitch-to-diameter ratio of 1.5
Tube wall temperature is uniform and constant
SKETCH
PROPERTIES AND CONSTANTS
Density (?) = 847 kg/m3
Specific heat (c)=1285 W/(kg K)
Thermal conductivity (k) = 70.1W/(m K)
Kinematic viscosity (?)= 2.92*10-7 m2/s
Prandtl number (Pr) = 0.0047
Alpha particles (charge = +2e, mass = 6.68 × 10-27 kg, e = 1.60 × 10-19 C) are accelerated in a cyclotron to a final orbit radius of 0.90 m. The magnetic field in the cyclotron is 0.30 T
The period of the circular motion of the alpha particles is closest to A) 0.44 ?s. B) 0.67 ?s. C) 0.87 ?s. D) 1.1 ?s. E) 1.3 ?s.
Water is sent from a fire hose at 34.5 m/s at an angle of 30.0° above the horizontal. What is the maximum height reached by the water, assuming the fire hose is level with the ground?
a. 7.59 m b. 15.2 m c. 30.4 m d. 300 m e. 60.7 m
Rank the following five capacitors from greatest to smallest capacitance, noting any cases of equality
(a) a 20-µF capacitor with a 4-V potential difference between its plates (b) a 30-µF capacitor with charges of magnitude 90 µC on each plate (c) a capacitor with charges of magnitude 80 µC on its plates, differing by 2 V in potential, (d) a 10-µF capacitor storing energy 125 µJ (e) a capacitor storing energy 250 µJ with a 10-V potential difference
1.e > a > b > d > c 2.e > d > a > b > c 3.c > b > a > d > e 4.b > a = c > d = e