Question: A 25,000-kg subway train initially traveling at 15.5 m/s slows to a stop in a station and then stays there long enough for its brakes

A 25,000-kg subway train initially traveling at 15.5 m/s slows to a stop in a station and then stays there long enough for its brakes to cool. The station's dimensions are 65.0 m long by 20.0 m wide by 12.0 m high. Assuming all the work done by the brakes in stopping the train is transferred as heat uniformly to all the air in the station, by how much does the air temperature in the station rise? Take the density of the air to be 1.20 kg/m3 and its specific heat to be 1020 J/kg • K.

Step by Step Solution

★★★★★

3.46 Rating (182 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

IDENTIFY The work done by the brakes equals the init... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

P-T-T (133).docx

120 KBs Word File

Students Have Also Explored These Related Thermodynamics Questions!

The beam supports the distributed load shown. Determine the resultant internal loadings on the cross section at points D and E. Assume the reactions at the supports A and B are vertical. 800 lb/ft IB...

A subway train starts from rest at a station and accelerates at a rate of 1.60 m/s2 for 14.0 s. It runs at constant speed for 70.0 s and slows down at a rate of 3.50 m/s2 until it stops at the next...

A counter flowing heat exchanger is used to cool air at 540 K, 400 kPa to 360 K by using a 0.05 kg/s supply of water at 20C, 200 kPa. The air flow is 0.5 kg/s in a 10-cm diameter pipe. Find...

A balloon initially contains 65 m3 of helium gas at atmospheric conditions of 100 kPa and 22°C. The balloon is connected by a valve to a large reservoir that supplies helium gas at 150 kPa and...

Problem S4: Daily Commute Problem Description Toronto has N subway stations, numbered from 1 to N. You start at station 1, and every day, you need to reach station N to get to school There are W...

Angela is a student at Nassau Community College, NY, and is interested in transferring to a four- year college. The following table shows the cost for Angela to visit 4 college campuses one- way...

You push an air-hockey puck along a surface with negligible friction while riding in a truck as it moves at a constant velocity in Earth's frame of reference. What do you observe? Why? 2. You are in...

1. Tick the correct option 1. V8 is equivalent to A 4 B 23 C 23 D (22)3 2. What is the solution to 2x+ 1 = 4*? A B C D 3. Which is the product law of logarithms? A log a X log b = log (ab) B log a X...

pls. do Q 2 & 3.. Thanks CASE STUDY - MARKETING MIX INTRODUCTION IKEA was founded by Ingvar Kampard in 1943 and its headquarters are in Sweden. It Provides its customers low-cost functional furniture...

CASE STUDY - MARKETING MIX INTRODUCTION IKEA was founded by Ingvar Kampard in 1943 and its headquarters are in Sweden. It Provides its customers low-cost functional furniture which is easy to...

Problem 3. (a) 2460 m, (b) 4.56 m/s, (0) 7.06 m/s. Problem 5. (a) 156.8 m, (b) 22.4 m/s, (0) 71.7 m, ((1) 228.5 m Problem 6. (a) 7.1 s, (b) 28.4 m/s Problem 7. (a) 0.87 111/82, (b) 21 km, (C) 25 km....

You require an internal rate of return of 8% to accept a project. If the project will yield $10,000 per year for 10 years. What is the maximum amount that you would be willing to invest in the...

For this web of pages, the importance of each page should be equal. Verify it for Î± = 0:85. :@ 2 3

The Doctrine of Preemption is most closely tied to the _ _ _ _ _ _ _ _ _ _ blank Clause.

Sketch the weighing gear of an Avery-Denison 500KN universal testing 1. machine in diagrammatic changing on this mach form, and explain the method of capacity ine. Sketch and describe a British...

Sketch and describe a British Standard proportional round test piece indicating how it should be prepared.

Xavier Corp. leases equipment with a useful life of ten years to Zero Inc. The operating lease requires annual payments of $1,500 over a three-year period without a renewal option. After two years,...

Assume that a lessee had no significant economic incentive as of the beginning of a 10-year lease for a storefront to exercise an option to terminate the lease after 5 years. However, by the end of...

Assume that an asset being leased is expected to have a residual value at the end of the lease term. What will be the impact of the residual value? (Select all that apply.) Check All That Apply 1. It...

19. What will be the value of RBX after the following instructions execute? mov rbx,0FFFFFFFFFFFFFFFFh and rbx,80808080h

The following options have the same underlying stock that does not pay any dividends. The stock is currently trading at $20 per share. Rank the following options by price, starting with the highest...

I am most confused with the bonus than anything Philadelphia Fastener Corporation manufactures nails, screws, bolts, and other fasteners. Management is considering a proposal to acquire new...

Maris Brothers, Inc., needs a cash disbursement schedule for the months of April, May, and June. Use the format given here and the following information in its preparation. Sales: February $501,000;...