Post a New Question

Physics

posted by .

A pair of eyeglass frames made of plastic with a coefficient of linear expansion of
1.30x10-4
(Cº
)
-1
have circular lens holes of diameter 4.40 cm at room temp (20º
C).
To what final temperature must the frames be heated in order to insert lenses
4.42 cm in diameter? (Hint: treat this as an area expansion problem)

  • Physics -

    r2 = r1 + a*(T-To)r1 = 4.42 cm.
    4.40 + 1.3*10^-4(T-20)4.40 = 4.42
    4.40 + 5.72*10^-4(T-20) = 4.42
    5.72*10^-4(T-20) = 4.42-4.40 = 0.02
    5.72*10^-4T - 114.4*10^-4 = 0.02
    5.72*10^-4T = 0.02 + 0.01144 = 0.03144
    T = 314.4*10^-4/5.72*10^-4 = 54.97o

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    Twisted nitinol-wire eyeglass framed unbend at room temperatures. Is the transition temperature of the frames above or below room temperature?
  2. network utiliztion

    A network has a capacity of 90,000 frames per minute and the input to the network is 900 frames per second. If .05% of all transmitted frames are lost and must be repeated, what is the network utilization?
  3. PHYSICS

    1...At what temp. of 0^C steel rod and copper rod have length of 800.1 & 99.9 respectively. At what temp. will the 2 rods have the same length. coeff.of linear expansion Copper-.000017 steel-.000013 2...The length of a brass bar increase …
  4. physics

    A pair of eyeglass frames are made of an epoxy plastic (coefficient of linear expansion = 1.30 10-4°C−1). At room temperature (20.0°C), the frames have circular lens holes 2.27 cm in radius. To what temperature must the frames …
  5. physics

    A pair of eyeglass frames are made of an epoxy plastic (coefficient of linear expansion = 1.30 10-4°C−1). At room temperature (20.0°C), the frames have circular lens holes 2.27 cm in radius. To what temperature must the frames …
  6. physics

    A pair of eyeglass frames are made of an epoxy plastic (coefficient of linear expansion = 1.30 10-4°C−1). At room temperature (20.0°C), the frames have circular lens holes 2.27 cm in radius. To what temperature must the frames …
  7. math

    a company was charged $290 for 13 frames. it was charged $430 for 20 frames. A. use the coordinates (13,290) and (20,430) to write a linear equation in point slope form that gives the relationship of the cost to the number of frames …
  8. Physics

    A pair of eyeglass frames made of plastic with a coefficient of linear expansion of 1.30x10-4 (Cº ) -1 have circular lens holes of diameter 4.40 cm at room temp (20º C). To what final temperature must the frames be heated in order …
  9. Algebra

    (Can someone please help?) A woman bought some large frames for $16 each and some small frames for $7 each at a closeout sale. If she bought 20 frames for $176, find how many of each type she bought?
  10. math

    she made 3 frames for pictures that each have an area of 24 square inches and each have a perimeter of 20 inches. How many tiles did she use for all 3 frames?

More Similar Questions

Post a New Question