An incompressible fluid flows at 0.252 m/s through a 44. mm diameter (circular cross section) pipe. The pipe widens to a square cross sectional area 5.5 cm on a side. Assuming steady flow:
(a) what is the speed through the "square" section?
(b) what is the flow rate in liters/minute?
(a) 0.13 m/s
(b) 23. liters/minute
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Graphical Analysis: An object is moving with constant non-zero acceleration in the +x direction. The position versus time graph of this object is
A. a horizontal straight line. B. a vertical straight line. C. a straight line making an angle with the time axis. D. a parabolic curve.
The objective and the eyepiece of a refracting astronomical telescope have focal lengths of 320 cm and 4.0 cm, respectively. The telescope is used to view Neptune and the final image is set at infinity
The diameter of Neptune is 4.96 × 107 m and the distance from the earth at the time of observation is 4.4 × 1012 m. What is the angle (in mrad) subtended by the final telescopic image of Neptune? A) 0.90 mrad B) 1.1 mrad C) 1.3 mrad D) 1.5 mrad E) 1.7 mrad
The name of which astronomer is most closely linked with that of Henry Russell?
a. Henrietta Leavitt b. Johannes Kepler c. Ejnar Hertzsprung d. Edwin Hubble
Careful observations of nearby normal and active galaxies reveal that the ass of the central black hole is well correlated with the mass of the galactic bulge. The ratio of bulge mass to black hole mass is roughly:
A) 1 to 2000. B) 1 to 200. C) 1 to 20. D) 20 to 1. E) 200 to 1.