A 1200-kg car is being raised at a constant speed if 25 cm/s by a ...

[crazycityslicker]

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?

[strudel15]

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]

TYSM

[shewald78]

Gracias!