Question: We Gladi 10% off Free Pick PHY120, Test 2. Fall 2022 1. Two boxes A and B of masses 18 kg and 12 kg respectively

We Gladi 10% off Free Pick PHY120, Test 2. Fall 2022 1. Two boxes A and B of masses 18 kg and 12 kg respectively slide with acceleration 1.2 m/s' on two inclines as shown in picture. The angles A and B are 1.1 and 0.2 rad respectively. Find coefficient of friction 14 15 16 21 22 23 24 between the incline and the boxes. 28 29 30 31 May 2018 NO - SNTWT NTFS 2. A 2.8 m long spring and a 3 kg bob are used make a conical Z 4 5 pendulum. The bob moves in a horizontal circular motion with orbital 6 7 8 9 10 11 12 speed 3 m/'s making angle 30 with the vertical. Find spring constant 13 14 15 16 17 18 19 20 21 22 23 24 25 26 and force of tension exerted on the spring. 27 28 29 30 31 September 2018 3. A bob is attached to a horizontal massless cord of length / =1 m as SMTWT shown in picture. A peg is placed below the suspension point of the CO 2 3 4 5 6 7 cord at a distance h = 0.8 m. Find the least centripetal force exerted 9 10 11 12 13 14 on the bob when it goes about the peg. 16 17 18 19 20 2 2% 24 25 26 27 4. How much time does it take for a 0.4 kW to drags a 300 kg crate over a 30 m incline with coefficient of friction 0.45 (as shown in picture). Find the angle of the 3 m incline and the work performed by the motor. 30 m

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