ANSWERS TO PROBLEMS 255 



CHAPTER X 



502. 6,400 foot-pounds. 503. 1,200 foot-pounds. 504. 120,000 

 foot-pounds. 506. 396,000. 507. -19,00.5,000 foot-pounds; 

 29,40;i,000 foot-pounds. 508. I'jU pounds. 510. 2'/^ miles per 

 liour; 1 2-ii miles per hour. 511. 1.2 horse-power. 512. 3.25. 

 513. ;!.25 horsepower. 515. 2-3. 516. 0.8; 0.96; 1.76. 517. 1.7 

 miles per hour. 518. 10 miles per hour; 5 miles per hour; 3.3 

 miles per hour; 1.2o miles per hour. 519. 3.3 miles per hour; 

 2.5 miles per hour. 520. 1.1. 521. 0.93; 0.67; 0.53. 522 280 

 pounds. 523. 2-15; 2-15. 526. 30 inches. 528. 100 pounds. 

 529. 100 pounds. 530. 200 pounds. 531. IJ-s miles per hour; 

 2.5 miles per hour; 3^4 miles per hour. 532. 133 pounds; 83 

 pounds. 533. 1>4 miles per hour. 535. 6 2-3 per day; 6 per 

 day; 10 per day. 536. 200. 537. 89. 538. 100 pounds. 539. 200 

 pounds. 540. 300 pounds. 541. 150 pounds. 542. 200 pounds. 

 543. 200 pounds. 545. 5.01 pounds. 546. 6.47 pounds. 547. 3 

 horsepower. 548. 4,500 pounds. 549. 3.85 pounds. 550. 2.8 

 miles per hour. 551. 40; 48 hours or 4.8 days. 552. 2.7. 553. 

 2>2. 554. 1.78 (i.e., two are more than sufficient). 555. 3.59 

 pounds. 556. 4.22 pounds. 557. 3,527.36 pounds. 558. 1.100 

 pounds. 559. 121; 22. 560. 121; 22. 561. 3. 562. 18. 566. 3. 

 567. 266. 568. 88. 569. 2.84 (i.e., three will do it easily). 570. 

 2. 571. 101; 139; 173; 282; 253; 374. 572. 16 per cent. 573. 

 24 per cent. 574. 40 per cent. 575. 46 per cent. 576. 32 per 

 cent. 577. 150 pounds; 46 per cent. 578. 199; 290; 498; 755. 

 579. High 29 pounds, low 3 pounds ; High 22 per cent, low 2 

 per cent. 580. IJ^ miles per hour; .9 mile per hour. 581. 23. 

 582. 36. 583. 937 pounds; 1,351 pounds. 584. 1 1-3 miles per 

 hour; 4-5 mile per hour. 585. 22.4. 586. 1.22. 588. 28 pounds; 

 49 pounds; 21.5; 20.9. 589. 15.7; 8.4. 590. 6.4; 4.1. 591. 

 2,549. 592. 2,140. 594. 1 to 30 ; 1 to 16. 595. 52.8 feet; 12 feet. 

 596. 3.2; 1; 8.30. 597. 24 feet; 500 feet. 599. 500 pounds;— 100 

 pounds (i.e., the team or the brakes must hold back with a force 

 of 100 pounds). 600. 235 pounds;— 125 pounds; 640 pounds;— 

 440 pounds. 601. 6; 300 pounds. 602. 2 1-3 miles per hour; 

 1.4 miles per hour (weight of horses not included, otherwise 

 1.1 miles per hour). The rule gives over 6 miles per hour, 

 which, of course, is too high; .\s fast as safety will permit. 

 603. More than one-half of the time. 604. 9.4 ; 3 to 32 or about 

 1 to 11. 



CHAPTER XI 



606. 144. 607. 5; 4; 8; 15. 609. 32; 21.8; 60. 610. 43; 9; 

 98. 611. 216; 128; 756; 528; 900; 160; 213; 160. 612. 3.061. 

 613. $137.75. 614. 3,490. 615. $97.72. 616. 5,712. 617. $171.36. 

 618. $109.50. 619. $25.50. 620. $222.25. 621. $553.61. 622. 

 7,840. 623. 900; 1,200. 624. 11,520. 626. 12,600 at 800 per sciuare. 



