(Solved): 13) Shown are the force vs. displacement graphs for three different springs which obey Hooke's Law. ...

13) Shown are the force vs. displacement graphs for three different springs which obey Hooke's Law. Which of the following is a correct statement? (A) The spring constant of spring B is less than that of spring C. F (N) 15.0 10.0 (B) 0.10 m/s 2.00 x 10-2 m ? 20 3.0 (B) The elastic potential energy stored in spring A is approximately ten times that of spring C, for the same spring elongation. 15) What is the speed of the gas in the left end of the pipe? (A) 4 x 105 m/s (C) The elastic potential energy stored in spring A is approximately one fifth that of spring B, for the same spring elongation. (D) The elastic potential energy stored in spring B is less than that stored in spring C, for the same spring elongation. (E) Spring A is the weakest of the three springs. 4.0 (C) 0.20 m/s 5.0 x(cm) Helium gas (an ideal fluid) is flowing steadily through a closed pipe as shown. The diameter of the pipe at the left end is 2.00 x 10² m and at the right end it is 1.00 x 102 m. The flow is slow enough such that the density of the helium remains constant. The volume flow rate of the gas is 2.00 x 103 m³/sec. 14) Which of the following is true about the flow rate of the gas through this pipe? (A) The mass flow rate and volume flow rate are highest at the left end of the pipe (B) The mass flow rate and volume flow rate are constant throughout the pipe irrespective of the pipe diameter (C) The mass flow rate and the volume flow rate are highest at the right end of the pipe (D) The mass flow rate is lowest at the left end but the volume flow rate is highest at the right end of the pipe (E) The mass flow rate is highest in the left end but the volume flow rate is lowest in the right of the pipe (D) m/s 1.00 x 10-2 m 20 (E) m/s