Homework #8: Due Tuesday, October 25
Note: When a range of sizes for the journal (shaft) and bushing (sleeve) are given, a "minimum clearance
assembly/fit" or "tightest fit" implies using the largest size of the journal and the smallest size of the
bushin
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Print Name: 50 I “+10 ”
Engr 120 Fluid Mechanics
EXAM #1 - Part 1, 15 minutes (closed book, no notes)
February 9, 2012
Please circle the best single answer for each question (1 point each):
1. The speed of sound is much faster
UC Merced
ENGR 120 Fluid Mechanics
Exam #1 PART 2 - February 10, 2011
Instructions: Students may use calculators and one double-sided, 8 1/2 x 11 note sheet. To receive
maximum credit, remember to show your approach and steps to solving the problems, as w
Solutions Exam #1
Print Name: _
Engr 120 Fluid Mechanics
EXAM #1 Part 1, 15 minutes (closed book, no notes)
February 10, 2011
Please circle the best answer (1 point each):
1. Pressure on a submerged object is directed normally to that surface.
TRUE
FALSE
Homework #3: Due Tuesday, September 15
1. A connecting rod with cross-sectional area 645 mm2 is made from a batch of steel tested to have
a mean yield strength of 180 MPa with a standard deviation of 5 MPA. It must support an axial
load of 80 kN with a st
Homework #5: Due Tuesday, September 29
1. In HW 04, problem 8, we examined a locational interference fit for a bearing. The range of hole
dimensions was [35.000, 35.020] mm and we found the shaft diameter would be in the range
[35.026, 35.042] mm. Conside
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Homework #7: Due Tuesday, October 18
When choosing Weibull parameters from Table 11-6, use that appropriate for manufacturers providing
data at a basic life rating of 106 revolutions, unless otherwise indicated. When nothing in the description
hints at an
Homework #3: Due Tuesday, September 13
1. Your supplier tells you that a given brass alloy will have mean yield strength of 20 kpsi with
standard deviation of 1.6 kpsi. He also assures you that " shafts made of that brass will have a
mean diameter D of 0.
Homework #5: Due Tuesday, Sept 27
1. A helical compression spring is formed of 2.5-mm diameter music wire. The spring has an
outside diameter of 31 mm, 14 total coils, and plain, ground ends.
a. What is the spring rate?
b. What force needed to close the s
Homework #11: Due Tuesday, November 22
1. An uncrowned straight-bevel pinion has 22 teeth, a diametral pitch of 6 teeth/inch, and a transmission
accuracy number of 5. Both the pinion and the gear are made of through-hardened grade 1 steel with a
Brinell h
Homework #9: Due Tuesday, November 8
"Gear Basics"
1. A 24-tooth pinion drives a 60-tooth gear. The diametral pitch is 2 teeth/inch. Per usual, the
addendum is 1/P and the dedendum is 1.25/P. The gears are cut using a pressure angle of 20.
a. Find the cir
Homework #13: Due Tuesday, December 6
1. A 16-inch diameter small pulley rotates at 900 RPM and nominally transmits 60 hp to a larger pulley,
centered 16 feet away at a 2 : 1 speed ratio. A 10-inch wide A-3 polyamid belt is used. The design
is for a (cons
Homework #10: Due Tuesday, November 15
1. A gearbox is needed to provide an exact 15:1 increase in speed while having the input and output
shafts on the same axis, as depicted below. Using 20 spur gears with the same P, choose the
small full-cut teeth gea
Homework #4: Due Tuesday, September 20
1. As seen in the previous homework, a machined 2 in diameter solid round bar has a groove
machined to diameter 1.8 in with a 0.1 in radius. The nonrotating bar is made of AISI 1095 HR
steel and is subjected to a rep
Homework #13: Due Tuesday, December 6
1. A 16-inch diameter small pulley rotates at 900 RPM and nominally transmits 60 hp to a larger pulley,
centered 16 feet away at a 2 : 1 speed ratio. A 10-inch wide A-3 polyamid belt is used. The design
is for a (cons
Homework #6: Due Tuesday, October 11
(Grey text indicates hints or engineering assumptions that might not always be given.)
1. Familiarity with basic fastener properties: For each of the standard fasteners specified informally
below, determine the major d
Homework #2: Due Tuesday, September 6
1. A hot-rolled steel bar made of AISI 1050 (ductile) steel is subject to the stresses given below.
Using the distortion energy (DE) and maximum shear stress (MSS) theories, determine the
factors of safety for each st
Homework #12: Due Tuesday, November 29
1. An axial clutch is being considered for a design. The frictional ring can have a maximum pressure of
120 psi, will have friction coefficient of 0.30, and outer diameter of 8.66 inches and an initial inner
diameter
Homework #1: Due Tuesday, August 30
1. For the static hinged beam loaded as shown, find the reactions at supports R1, R2, and R3. Plot the
shear-force and bending moment diagrams with labels. Show the values at points O, A, B, C, and D.
Hint: It may be us