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jinx007
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I have some problems dealing with this question please help me...!
In a downhill ski-race the total distance between start and finish is 1800 M and the total vertical drop is 550 M
The weight of the skier and equipment is 900 N and the time taken for the decent is 65 S
1/ calculate the average speed??
2/ calculate the lost in gravitational potential energy of the skier..?
3/ The average resistive force acting against the skier is 250 N, calculate the work done against this resistive force??
4/ If the skier does no work, calculate
1/ The kinetic energy as he passes the finish
2/ The speed as he passes the finish
Answer
1/ average Velocity = total distance / total time 1800/65 = 27.7 m/s
2/ Using conservation of energy P.E = K.E + P.E
mg x 550 = 1/2 x m x (27.7)^2 + mgh
so i eliminate m and (5395-383.6) = 5011.1 J here i don't know if the technique is good
3/ W = f x d
250 x 1800 = 4.5 x 10^5
4/
1/ Here i don't know how to proceed
2/ against same problem
PLEASE CHECK THE ANSWER AND HELP ME TO ATTEMPT THE LAST PART...THANK IN ADVANCE
In a downhill ski-race the total distance between start and finish is 1800 M and the total vertical drop is 550 M
The weight of the skier and equipment is 900 N and the time taken for the decent is 65 S
1/ calculate the average speed??
2/ calculate the lost in gravitational potential energy of the skier..?
3/ The average resistive force acting against the skier is 250 N, calculate the work done against this resistive force??
4/ If the skier does no work, calculate
1/ The kinetic energy as he passes the finish
2/ The speed as he passes the finish
Answer
1/ average Velocity = total distance / total time 1800/65 = 27.7 m/s
2/ Using conservation of energy P.E = K.E + P.E
mg x 550 = 1/2 x m x (27.7)^2 + mgh
so i eliminate m and (5395-383.6) = 5011.1 J here i don't know if the technique is good
3/ W = f x d
250 x 1800 = 4.5 x 10^5
4/
1/ Here i don't know how to proceed
2/ against same problem
PLEASE CHECK THE ANSWER AND HELP ME TO ATTEMPT THE LAST PART...THANK IN ADVANCE