Question

m A block with mass m, - 8.9 kg is on an incline with an angle 8 - 24" with respect to the horizontal. For the first question there is no friction, but for the rest of this problem the coefficients of friction are: Pk - 0.23 and Ms - 0.253. 1) When there is no friction, what is the magnitude of the acceleration of the block? 3.99 m/s2 Submit Your submissions: 3.99 Computed value: 3.99 Feedback: Correct! Submitted: Wednesday, July 29 at 2:13 PM 2) Now with friction, what is the magnitude of the acceleration of the block after it begins to slide down the plane? m/s2 Submit 3) m To keep the mass from accelerating, a spring is attached. What is the minimum spring constant of the spring to keep the block from sliding if it extends x -0.15 m from its unstretched length N/m Submit

Answer 1

Solo (2 O=240 =8.g.kg N ak mgsing angtoso ang To lx mg coso - 18.33N Ilk = 0.23 ; 4920.253 As the block slides down f = lk N = lr fe 0.2348.9x9.8% (0924 mgsino -f=ma (8.949.8*5'm 24 ) - 18.33= 8.99 ha a = 1.93m/s2 3 a=0.15m u= 0.15 m ) (mg sino xx) - fx = 1 kx? 35.48X – 18.337 = {xKx? spring constant K=228.66 Nim