Question

● Complete the following calculations a. The amount of work done for a crane lift a 450,000g car to the top of a ple of junk 63m high. (3) b. Using a4.2W lawnmower, a gardener does 93001 of work to cut 7500N of grass in 3min. How far did the gardener Bush the lawnmower? (a) 7. Below shows the diagram of a typical broom- a simple machine that is used to sweep dirt in our houses L,Nm 0.7m Noting carefully the position of the woman's hand and assuming that the mass of dirt to be swept is 6.5kg Identafy the snecifis type of simple machine principle that the broom follows (1 b. Determine the amount of input force that the lady would exert with each stroke of the broom. (a) C. Determine the mechnel advantage of this broam and make a cemmthisumber in relation to the type of machine this is (4) 6. a. Determine the amount of enery to raise the temperature of 5000 Kg of Iron from 3C to 18C. ( b.50kg of a certain metal absorbs 154K) of energy and experienced a temperature rise form 28C to 36C. By c.Identify how roasting a piece of chicken in a pan in an oven demonstrates the three ways heat travels (6)ITotal 90 points) calculating it's 'C' value identily the metal. (4)

Answer 1

Solution) 6)a

We know, Work done W=mgh=450 kg*9.8 m/s^2*6.3 m=27783 Joules

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Acc to HOMEWORKLIB RULES, I can answer only one at a time. Good luck!:)