EBK BUSINESS DRIVEN INFORMATION SYSTEMS
6th Edition
ISBN: 8220106796986
Author: BALTZAN
Publisher: YUZU
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Chapter C, Problem P4AYK
To determine
An ERD from the given information to create a database for Slope side Ski Rentals for keeping track of the ski rentals, customers, rent paid and any damage to the rented skis.
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13.64 The shaft shown in Sketch h transfers power between
the two pulleys. The tension on the slack side (right pul-
ley) is 30% of that on the tight side. The shaft rotates
at 900 rpm and is supported uniformly by a radial ball
bearing at points 0 and B. Select a pair of radial ball bear-
ings with 99% reliability and 40,000 hr of life. Assume
Eq. (13.83) can be used to account for lubricant clean-
liness. All length dimensions are in millimeters. Ans.
Cmin = 42,400 N.
Part 3: Problem-Solving. Solve the following problems. Show all calculations.
1. A retaining wall 5.80m high supports soil that has the following properties:
Unit weight = 17.3 kN/m³
Angle of internal friction = 26 deg.
Cohesion = 14.5 kPa
a) Calculate the normal pressure acting at the back of the wall assuming no tensile crack
occurs in the soil.
b) Find the location of the tensile crack measured from the surface of horizontal backfill.
c) Determine the active pressure acting on the wall in tensile crack occurs in the soil.
2. The soil material is supported by a retaining wall to a height of 6m. The unit weight of the soil is
16 kN/m³ and the angle of internal friction is 29 deg. Assume the soil is cohesionless.
a) Determine the earth pressure on the wall.
b) Find the total active pressure if surcharge of 14 kPa is applied on the surface of
horizontal backfill.
c) Locate the position of the total pressure from the bottom.
Chapter C Solutions
EBK BUSINESS DRIVEN INFORMATION SYSTEMS
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