I really want to learn this so could someone tutor me throughthis question thank

Question

I really want to learn this so could someone tutor me throughthis question thanks in advanced guys. (Answers are at theend)
1. A curved portion of a highway under construction has aradius of 520 m. The legal speed limit of this highway is 100 km/h. (a) At what angle does this portion of the highway have to bebanked so that a car can safely travel at the speed limit when there is ice on the road? (b) How long does it take a 14.0 kW crane to lift 1250 kg ofconstruction material up to the highway 15.0 m above the ground?
Answers: 1. (a) 8:61, (b) 13.1 sec I really want to learn this so could someone tutor me throughthis question thanks in advanced guys. (Answers are at theend)
1. A curved portion of a highway under construction has aradius of 520 m. The legal speed limit of this highway is 100 km/h. (a) At what angle does this portion of the highway have to bebanked so that a car can safely travel at the speed limit when there is ice on the road? (b) How long does it take a 14.0 kW crane to lift 1250 kg ofconstruction material up to the highway 15.0 m above the ground?
Answers: 1. (a) 8:61, (b) 13.1 sec 1. (a) 8:61, (b) 13.1 sec

Explanation / Answer

a) we know that the banking angle            tan = v2 / rg         ==> =tan-1( v2 / rg) = tan-1( 27.772 / 520 * 9.8)    =8.6o     b) power P = F.S / t          ==>  t = F.S / P                     = m g S / P                     = 1250 * 9.8 * 15 / 14 x 1000                     = 13.125s

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