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An automobile has a mass of 1500 kg, and its aluminum brakes have an overall mass of 6.00 kg.?
An automobile has a mass of 1500 kg, and its aluminum brakes have an overall mass of 6.00 kg. (a) Assume all the mechanical energy that transforms into internal energy when the car stops is deposited in the brakes and no energy is transferred out of the brakes by heat. The brakes are originally at 20.0°C. How many times can the car be stopped from 25.0 m/s before the brakes start to melt? (b) Identify some effects ignored in part (a) that are important in a more realistic assessment of the warming of the brakes.
(b) Real brakes transfer most of the heat to the disk (rotor), which can get red-hot and lose a lot of heat by radiation as well as conduction to the air. It's usually made of steel, so would have a higher melting point.
Some of the kinetic energy is absorbed by the engine and I presume ends up as more heat out the exhaust pipe, and in the engine cooling system, cooled by the radiatior and fan.
In a hybrid engine, some is absorbed by an electric generator and used to charge the battery.
Flapping Sprocket Aluminum Mechanical Wings
 Morris Products 90862 Mechanical Lug, Three Conductors, Two and Four Hole Mount, Aluminum, 1000 AWG, 1000mcm - 500mcm Wire Range Sale Price: $50.76  Eligible for free shipping!Availability: Temporarily out of stock. Order now and we'll deliver when available. We'll e-mail you with an estimated delivery date as soon as we have more information. Your credit card will not be charged until we ship the item. See Reviews For This Product DescriptionUL486B/CSA listed  |
 Ullman Devices D-2 Alloy Steel Slotted Mechanical Screw Starter, Aluminum Handle, 5-5/8" Length Sale Price: $10.97 Eligible for free shipping!Availability: Usually ships in 24 hours See Reviews For This Product DescriptionUllman Devices has been manufacturing a quality line of Specialty Tools for over 75 years . Ullman' s precision engineered alloy bits hold the screw firmly for trouble free starting. So no more fumbling with hard-to-position screws! This screw starter releases and resets automatically... |
 Aluminum Open End Blind Rivet 3/16" Diameter , .700" Length, Drill # 11, Grip .376"-.500" (Pack of 100) Sale Price: $7.88 Eligible for free shipping!Availability: Usually ships in 24 hours See Reviews For This Product DescriptionBlind rivets provide a way to join parts together when you don't have access to both sides. They consist of a rivet (a hollow body with a head) and a mandrel (a thin nail with a bulbed end). Rivets require a setting tool for installation... |
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 Ullman Devices PD-12 Alloy Steel Phillips Mechanical Screw Starter, Aluminum Handle, 15-1/4" Length Sale Price: $12.60 Eligible for free shipping!Availability: Usually ships in 24 hours See Reviews For This Product DescriptionUllman Devices has been manufacturing a quality line of Specialty Tools for over 75 years . Ullman' s precision engineered alloy bits hold the screw firmly for trouble free starting. So no more fumbling with hard-to-position screws! This screw starter releases and resets automatically... |
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 Ullman Devices F-2 Alloy Steel Phillips/Torx Mechanical Screw Starter, Aluminum Handle, 5-5/8" Length Sale Price: $9.76 Eligible for free shipping!Availability: Usually ships in 24 hours See Reviews For This Product DescriptionUllman Devices has been manufacturing a quality line of Specialty Tools for over 75 years. Ullman's precision engineered jaws hold the screw firmly for trouble free starting. So no more fumbling with hard-to-position screws! This screw starter releases and resets automatically... |
 Aluminum Pipe Fitting, Nipple, Schedule 40, 1" NPT Male X 6" Length Sale Price: $7.01 Eligible for free shipping!Availability: Usually ships in 24 hours See Reviews For This Product DescriptionThe Merit Brass nipple is a schedule 40 aluminum pipe fitting with male National Pipe Taper (NPT) threads for connecting and extending female threaded pipes. The fitting has NPT threads for creating tighter seals than straight threads and is made from Alloy 6061-T6 for increased corrosion resistance and strength... |
Aluminum Pipe Fitting, Nipple, Schedule 40, 1" NPT Male X 4" Length Sale Price: $6.36 Eligible for free shipping!Availability: Usually ships in 24 hours See Reviews For This Product DescriptionThe Merit Brass nipple is a schedule 40 aluminum pipe fitting with male National Pipe Taper (NPT) threads for connecting and extending female threaded pipes. The fitting has NPT threads for creating tighter seals than straight threads and is made from Alloy 6061-T6 for increased corrosion resistance and strength... |
