lows m 2 minutes i) A portable machine requires a force of 300N to move it. How much work is machine is moved 20m and what average power is utilized if the movement j) A mass of 2000My is raised through a height of 10m in 20ms. What is (i) the work done MO (ii) the power developed? 10 k) Find the accelerating force when acceleration of Sm/s?. Daving a mass of 1.7Mg increases its spee 2. Use the following Data to answer the Ving questions Iv(v) 2 | (mA) 10. 12 14 I(A) Dio o. ols 6 8 16 0.oll

Acommercial grade cubical freezer, 4 m on a side, has a composite wall consisting of an exterior sheet of 5.0-mm thick plain carbon steel (kst= 60.5 w/m k), an intermediate layer of 100-mm thick polyurethane insulation (kins 0.02 w/m k), and an inner sheet of 5.0- mm thick aluminium alloy (kal polyurethane insulation and both metallic sheets are each characterized by a thermal contact resistance of r 2.5 x 104 m2 k/w. (a) what is the steady-state cooling load that must be maintained by the refrigerator under conditions for which the outer and inner surface temperatures are 25°c and -5°c, respectively? (b) for power saving purpose, which wall material should be increased/reduced in. thickness in order to reduce 50% of the cooling load found in part (a)? redesign the thickness of the proposed material. 177 w/m-k). adhesive interfaces between the q=575.93 w