physics sample problems

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  • 7/25/2019 Physics Sample Problems

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    Question 1

    On a linear X temperature scale, water freezes

    at -136.0X and boils at 433.0X. On a linearY temperature scale, water freezes at -.00Y

    and boils at -!!.00Y. " temperature of

    4#.00Y corresponds to w$at temperature on

    t$e X scale%

    Question 2

    "t 16&, a brass cube $as an ed'e len't$ of 30

    cm. ($at is t$e increase in t$e cube)s surface

    area w$en it is $eated from 16& to 6*&% +$e

    linear epansion coefficient of brass is 1*

    10-6&.

    Question 3

    "n aluminum-allo/ rod $as a len't$ of 13.#*!

    cm at 1.00& and a len't$ of 13.03 cm at

    t$e boilin' point of water. (a)($at is t$e

    len't$ of t$e rod at t$e freezin' point of

    water% (b)($at is t$e temperature if t$e

    len't$ of t$e rod is 13.!6 cm%

    Question 4

    ($en t$e temperature of a metal c/linder israised from 0.0& to 4#.&, its len't$

    increases b/ 0.11. (a)2ind t$e percent

    c$an'e in densit/. (b)($at is t$e metal% se

    +able below.

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    Question 5

    "n aluminum cup of 130 cm3capacit/ is

    completel/ filled wit$ 'l/cerin at 1#&. ow

    muc$ 'l/cerin will spill out of t$e cup if t$e

    temperature of bot$ t$e cup and 'l/cerin is

    increased to 44&% 5+$e linear epansion

    coefficient of aluminum is !3 10-61&. +$e

    coefficient of olume epansion of 'l/cerin is

    .1 10-41&.7

    Question 6

    " small electric immersion $eater is used to

    $eat #! ' of water for a cup of instant coffee.

    +$e $eater is labeled 81#0 watts9 5it conerts

    electrical ener'/ to t$ermal ener'/ at t$is

    rate7. &alculate t$e time re:uired to brin' all

    t$is water from !0& to 100&, i'norin' an/

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    $eat losses. 5+$e specific $eat of water is 416

    ;. +$e latent $eat of fusionis 333

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    Question 10

    +$e specific $eat of a substance aries wit$

    temperature accordin' to cA 0.61 B 0.#1TB

    0.01T!, wit$ Tin & and cin cal'=>. 2ind

    t$e ener'/ re:uired to raise t$e temperature of

    .0 ' of t$is substance from 3.0& to 1#&.

    Question 11

    &onsider a slab of face area Aand t$ic,k3A 0.043!

    (m=> and k4A 0.104 (m=> 5k!is

    un

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    ($at is interface temperature T34%