Solve each of the problems 15 on your answer sheet. It may help to sketch the situation, draw a force diagram. YOU MUST SHOW WORK TO GET CREDIT! 3. A speaker vibrating at 426 Hz produces the fundamental standing wave in a closed tube. Calculate the length of the tube? (Assume the speed of sound in air is 335m/s) 4. Oliver w his lawnmower handle (mass = 50kg) at a 35 from the ground with a force of 360N. The surface of the lawn has a coefficient of friction, 11:20. a. Determine the value of the normal force on the mower. b. Calculate the acceleration of the mower. 5. While standing still on ice skates, a 60 kg boy tosses a backpack at 3.5 m/s. The boy glides back at 0.25 m/s. Calculate the mass of the backpack. Physics Equation Sheet/Scratch paper Ax = 1/2 at2 + vit Eint = FkAx vi = vi2+ 2aAx W = FAX Vf = at + Vi Eg = mgh Fnet = ma F =KX + Fo Eel = 1/2 kAx2 my2 Fnet Ek = 1/2 mv2 r Fg = mg = G mim2 72 n * sindi = n * sinor Ff = uFn V = fl f = f 340 (340+V) p = mv 1= Ap = FAt Oh= Ei + Ei E=MC2 Constants: G=6.67x10-11 Change Constant + inople = Istanbul C= 3.0x108m/s Sports talk in 2nd hour. Nebulas chatter in 3'd hour Knuckleheadery in 4th hour