Fluid Mechanics
8th Edition
ISBN: 9780073398273
Author: Frank M. White
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 7, Problem 7.98P
A buoyant ball of specific gravity SG < 1 dropped into water at inlet velocity V0 will penetrate a distance h and then pop out again, as in Fig. P7.98. Make a dynamic analysis of this problem, assuming a constant drag coeff icient, and derive an expression for h as a function of the system properties. How far will a 5-cm-diameter ball with SG = 0.5 and CD= 0.47 penetrate if it enters at 10 m/s?
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Problem 6. The circular plate shown rotates about its vertical diameter. At the instant shown, the
angular velocity ₁ of the plate is 10 rad/s and is decreasing at the rate of 25 rad/s². The disk lies
in the XY plane and Point D of strap CD moves upward. The relative speed u of Point D of strap
CD is 1.5 m/s and is decreasing at the rate of 3 m/s².
Determine (a) the velocity of D, (b) the acceleration of D.
Answers: =0.75 +1.299]-1.732k m/s a=-28.6 +3.03-10.67k m/s²
200 mm
x
Z
Problem 1. The flywheel A has an angular velocity o 5 rad/s. Link AB is connected via ball
and socket joints to the flywheel at A and a slider at B. Find the angular velocity of link AB and
the velocity of slider B at this instant. (Partial Answer: @ABN = -2î + 2.25; red
Z
-1.2 ft
C
-7 Y
-1.5 ft-
B
2.0 ft
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Chapter 7 Solutions
Fluid Mechanics
Ch. 7 - Prob. 7.1PCh. 7 - A gas at 20°C and 1 atm flows at 6 ft/s past a...Ch. 7 - Prob. 7.3PCh. 7 - Prob. 7.4PCh. 7 - SAE 30 oil at 20°C flows at 1.8 ft3/s from a...Ch. 7 - Prob. 7.6PCh. 7 - P7.7 Air at 20°C and 1 atm enters a 40-cm-square...Ch. 7 - P7.8 Air, p = 1.2 kg/m3 and E-5 kg/(m .s), flows...Ch. 7 - P7.9 Repeat the flat-plate momentum analysis of...Ch. 7 - Repeat Prob. P7.9, using a trigonometric profile...
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