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Author Question: A 1200-kg car is being raised at a constant speed if 25 cm/s by a crane, using a 20-m long steel ... (Read 62 times)

crazycityslicker

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on: Jul 29, 2018
A 1200-kg car is being raised at a constant speed if 25 cm/s by a crane, using a 20-m long steel cable that is 1.5 cm in diameter. Young's modulus for steel is 2.0  1011 Pa. What is the change in length of the cable caused by the car?
 
  A) 6.7 mm
  B) 6.7 cm
  C) 3.3 mm
  D) 3.3 cm
  E) 3.3 m

Question 2

What are the wavelength and the corresponding photon energy (in electron-volts) of the primary light emitted by an ideal blackbody at each of the following temperatures? (c = 3.00  108 m/s, h = 6.626  10-34 J  s, 1 eV = 1.
 
  60  10-19 J, and the constant in Wein's law is 0.00290 m  K)
  (a) 400C?
  (b) 800C?
  (c) 1200C?


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strudel15

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Reply #1 on: Jul 29, 2018
Answer to Question 1

A

Answer to Question 2

(a) 4.31 m, 0.288 eV (b) 2.70 m, 0.459 eV (c) 1.97 m, 0.631 eV


crazycityslicker

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Reply 2 on: Jul 29, 2018
Gracias!

softEldritch

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Reply 3 on: Yesterday
Excellent

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