Question

please solve question 15, 16 and 18. Thank you so much in advance

QUESTION 15 Now let's use the concept of work using the classic story. Suppose David is spinning his sling at angular velocity w = 2 * 10 sec-1, which corresponds to 10 revolutions per second. The centrifugal force due to the rotation is given by the expression mw'r, where r is the distance from the center of rotation and is the mass of the stone begin slung. What is the work done by the centrifugal force, as it moves a stone weighing at 3 kg by 1 meter from the center of rotation? Give answer in SI units. (What are the units of work, by the way?) Note the integration can be done graphically, as in the preceding exercises. QUESTION 16 Supposing, in the preceding exercise, that all of the work went into the kinetic energy of the stone, as it leaves the sling, what is the velocity of the stone as it detaches from the sling, in miles per hour?

Answer 1

19w=S7d7 (15) FD - - 2 2 » W = fm rw do W = m R² wo? > w = 3 x 1² x 47²x10² YOYO Sådr={{1} → W a mrtw R = im rad w = 2T XO 2 Im=3kg - TW = 5.9 x 1037 AK W Ź muaw => var = {2x5:9x109 min => b= 62.72 mis 14003 mile per hour] - 1140.3 mile per hour

am be fore collision after collision Heat developed = 1 mv. + mv 2 - 1 2 2m (V - V2) ² Heat = 4 m (2v,+2v,? – vi?- v*+2 V,0z) Meat = tm (V, +V₂) ² anno L = f (VI+V₂) I L=latent Heat Vitve = 18L of ice. Vtva = Relastine relocity = 18% 334 *103 m Relatine relocity = 1634.6 m