1. A 35 Kg pack is carried up a 2200 m-High Mountain in 8 hours a) How much work

Question

1. A 35 Kg pack is carried up a 2200 m-High Mountain in 8 hours a) How much work is done? b) What is the power applied in this case? 2. An object of mass 450 Kg is raised to a high of 15.0 m above the floor a) What potential energy has it acquired by the with respect to the floor? b) If the object free fall from the mentioned height, determine the velocity of the object when it heat the ground. 3. What is the velocity of the 23.0 kg mass object which has 1350 J of kinetic energy? 4. A flywheel rotates at 820 rpm. a) How long in seconds does it take to complete one revolution? b) How many how many revolutions does it complete in 9.00 s? 5. A truck tire rotates at an initial angular speed 18.5 rad/sec. The driver steadily accelerates and after 4.50 s the tire's angular speed is 30.5 rad/sec. a) What is the angular acceleration during its linear acceleration? b) How many revolutions the tire complete in this period of time?(Round off to tenth)

Explanation / Answer

1(a) Work done against gravity=Potential energy gained = mgh=35*9.81*2200=755370 J

1.(b) Average Power = Work done/time taken = 755370 / (8*3600) =26.22 J/s

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