Two ideal Carnot thermodynamic engines have the same efficiency. ...

[jjjetplane]

Two ideal Carnot thermodynamic engines have the same efficiency. One operates between 5.0  102 K and 3.0  102 K, and the other between 4.0  102 K and some lower temperature. What is the lower temperature?
 
  A) 200 K
  B) 220 K
  C) 240 K
  D) 260 K
  E) 280 K

Question 2

A string of length 2.5 m is fixed at both ends. When the string vibrates at a frequency of 85 Hz, a standing wave with five loops is formed.
 
  (a) Determine the distance between two adjacent nodes.
  (b) Determine the wavelength of the waves that travel on the string.
  (c) Determine the speed of traveling waves on this string.
  (d) Determine the fundamental frequency of this string.

[pikon]

Answer to Question 1

C

Answer to Question 2

(a) 0.50 m (b) 1.0 m (c) 85 m/s (d) 17 Hz

[jjjetplane]

TYSM

[helenmarkerine]

Great answer, keep it coming