An Introduction to Mechanical Engineering 3rd. Edition by Jonathan Wickert, Kemper Lewis | 9781111576806 | 1111576807 | Holooly

An Introduction to Mechanical Engineering [EXP-58305]

58 SOLVED PROBLEMS

Question: 4.9

A 13.5-kN automobile is being driven at 50 km/h through a turn of radius of 60 m. Assuming that the forces are equally balanced among the four wheels, calculate the magnitude of the resultant force acting on the tapered roller bearings that support each wheel. To calculate the cornering force, apply

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Solution With

\omega

denoting the ...

Question: 4.4

Adjustable Wrench Determine the moment about the center of the nut when the 250-N force is applied to the adjustable wrench. Use (a) the perpendicular lever arm method and (b) the moment components method. (See Figure 4.13 on page 146.) Approach We are tasked with finding the resulting moment

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(a) We first need to determine the length of the p...

Question: 3.4

Aerial Refueling The KC-10 Extender tanker aircraft of the United States Air Force is used to refuel other planes in flight. The Extender can carry 365,000 lb of jet fuel, which can be transferred to another aircraft through a boom that temporarily connects the two planes.(a) Express the mass of

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(a) We first determine the mass of the fuel in the...

Question: 3.8

Aircraft’s Cabin Door Commercial jet aircraft have pressurized cabins because they travel at high altitude where the atmosphere is thin.At the cruising altitude of 30,000 ft,the outside atmospheric pressure is only about30% of the sea-level value.The cabin is pressurized to the equivalent of

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The net pressure acting on the door is the differe...

Question: 6.2

Aircraft’s Fuel Capacity A commercial passenger aircraft is loaded to its maximum fuel rating of 90,000 L. By using the density of 840 kg/m3 for jet fuel, calculate the fuel’s weight.

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The fuel’s volume is first converted to the units ...

Question: 8.1

Angular Velocity Conversions Verify the conversion factor between rpm and rad/s that is listed in Table 8.1. Approach To convert from the dimensions of revolutions per minute to radians per second, we will need conversions for both time and an angle. There are 60 s in 1 min, and 2π rad in one

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We convert dimensions as follows:

1\frac{re...

Question: 7.10

Automotive Disk Brakes The driver of a 1200-kg automobile traveling at 100 km/h applies the brakes and brings the vehicle to a complete stop. The vehicle has front and rear disk brakes, and the braking system is balanced so that the front set provides 75% of the total braking capacity. Through

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In dimensionally consistent units, the initial vel...

Question: 8.3

Automotive Engine’s Power At full throttle, a four-cylinder automobile engine produces 149 ft ? lb of torque at a speed of 3600 rpm. In the units of hp, how much power does the engine produce? Approach We can use Equation (8.5) to fi nd the engine’s instantaneous power output. As an intermediate

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In dimensionally consistent units, the engine’s sp...

Question: 6.6

Automotive Fuel Line An automobile is driving at 40 mph, and it has a fuel economy rating of 28 miles per gallon. The fuel line from the tank to the engine has an inside diameter of 3/8 in.(a) Determine the volumetric flow rate of fuel in units of ft3/s. (b) In the dimensions of in./s, what

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(a) The volumetric flow rate is the ratio of the v...

Question: 3.6

Bending of a Drill Bit This example illustrates the full problem-solving process from Section 3.2, which incorporates the principles of dimensional analysis from Sections 3.3–3.5. A drill press holds sharpened bits in a rotating chuck and is used to boreholes in a workpiece. The steel drill bit has

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The quantity 64/3π is a dimensionless scalar, and ...

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