QUESTION 8 spring-1 Unknown mass, il :li! f1 attached to the free ~ end of a spring (the spring-2 other end of the spring f is fixed) oscillates with 2 the frequency f1. f \\ mass oscillates ? The same with the frequencyfz on the other spring. What is the frequency of the system of the springs and the masses, shown it in the figure? f1 = 9.65Hz, f2 = 5.26Hz, f = '2 Hz Input your answer in Hz using 3 signicant gures. Hint 8 points Save Answer QUESTION 9 During a fireworks display, a shell is shot into the air with an initial speed of 64.8 m/s at an angle of 67.20 above the horizontal, as illustrated in Figure. The fuse is timed to ignite the shell just as it reaches its highest point above the ground. Calculate the height at which the shell explodes. Enter your answer in meters using 3 signicant gures. QUESTION 1 A ball is dropped from rest from a height H =8.93 m above the ground. Another ball is thrown vertically upwards from the ground at the instant the first ball is released. Determine the initial speed of the second ball in We if the two balls are to meet at a height h =1.67 m above the ground. Input your answer using 3 significant gures. 9 points Save Answer QUESTION 2 v2 = v02 + 2a(x-x0) x0 = 2.76 m v = 6.91 mls v0 = 3.53 m/s a=8.'18m/s2 x=?inm Input your answer in m using 3 signicant gures. 8 points Save Answer QUESTION 11 A power reactor has pressurized water at 336C . Steam. produced in the steam generator, is used to drive the turbine-generators. Eventually the steam is condensed to water at 37C and then heated again to start the cycle over. Calculate the maximum theoretical efciency for a heat engine operating between these two temperatures. 9 points Save Answer QUESTION 12 Two bodies 1 and 2 with heat capacities C1 and 02 and temperatures T1 and T2 are brought into thermal contact in a thermostat, after which the temperature Tis reached in thermal equilibrium. T1 =10.8 c T2 =88.2 C T = 46.3 \"C C1 = 37.4 J/\"C 02 =7 J/\"C : 9 points Save Answer QUESTION 3 A PEg = mgh, 7.27 A PEg = 52.2 J. g = 9.80m/s2, m = 0.466 kg, h=?m, Input your answer using 3 significant gures. E 8 points Save Answer QUESTION 4 Calculate the temperature increase of 67.3 kg of brake material with an average specic heat of 844 J/kg-C if the material retains 50.0% of the energy from a 82874-kg truck descending 96.9 m (in vertical displacement) at a constant speed. 8 points Save Answer QUESTION 5 The body in linear motion, starting from the known initial speed V0= 1.53 m/s, gradually reduces the speed so that after each known time interval 1' = 2.85 s the speed is halved. What distance will the body travel in a given time interval T: 9.59 s from the start of motion? Input your answer in m using 3 signicant gures. : 8 points Save Answer QUESTION 10 A point body, moving along the x-axis, smoothly changing speed, moves in such a way that, for each subsequent time interval T from the beginning of the movement, the body travels a longer distance by 2D. Moreover, D is the distance traveled for the first time interval