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A child pulls a 15kg sled containing a 5.0kg dog along a straight path on a horizontal surface. He exerts a force of 55 N on the sled at an angle of 20° above the horizontal, as shown in the figure above. The coefficient of friction between the sled and the surface is 0.22.
a. Calculate the normal force of the surface on the system.
b. Calculate the acceleration of the system.
c. Calculate the work done by the child's pulling force as the system moves a distance of 7.0 m
 one year ago
 one year ago
A child pulls a 15kg sled containing a 5.0kg dog along a straight path on a horizontal surface. He exerts a force of 55 N on the sled at an angle of 20° above the horizontal, as shown in the figure above. The coefficient of friction between the sled and the surface is 0.22. a. Calculate the normal force of the surface on the system. b. Calculate the acceleration of the system. c. Calculate the work done by the child's pulling force as the system moves a distance of 7.0 m
 one year ago
 one year ago

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alexynBest ResponseYou've already chosen the best response.0
d. At some later time, the dog rolls off the side of the sled. The child continues to pull with the same force. On the axes below, sketch a graph of speed, v, versus time, t, for the sled. Include both the sled's travel with and without the dog on the sled. Clearly indicate with the symbol tr the time at which the dog rolls off.
 one year ago

ksaimouliBest ResponseYou've already chosen the best response.1
can u do me a favor can u draw the diagram
 one year ago

ksaimouliBest ResponseYou've already chosen the best response.1
what part u r struck
 one year ago

ksaimouliBest ResponseYou've already chosen the best response.1
ok so (a) FN=mgFsin 20
 one year ago

ksaimouliBest ResponseYou've already chosen the best response.1
i am sorry i am weak at graphs :(
 one year ago

ksaimouliBest ResponseYou've already chosen the best response.1
@ivanmlerner can u help her please
 one year ago

alexynBest ResponseYou've already chosen the best response.0
thanks for trying though
 one year ago

ivanmlernerBest ResponseYou've already chosen the best response.0
It is only in part d that you need help?
 one year ago

ivanmlernerBest ResponseYou've already chosen the best response.0
Ok, you know the aceleration before the dog jumps out, so you can draw the graph of v until that moment by using the aceleration as the slope of the line because it is the rate of change of the velocity. Do you understand it so far?
 one year ago

alexynBest ResponseYou've already chosen the best response.0
Im unsure about the acceleration. I got 0.07 m/s. Is that right?
 one year ago

ivanmlernerBest ResponseYou've already chosen the best response.0
Just to be sure, what number are you considering for g?
 one year ago

ivanmlernerBest ResponseYou've already chosen the best response.0
I'll be back in a few minutes but I got 0.43 with 9.8
 one year ago

furnessjBest ResponseYou've already chosen the best response.1
So, I had a go at this, I get a) 177.4N b) 0.63 m/s/s c) 362J As for d)  the question says to sketch, so you do not need values. You just need to realise that with less mass but the same force, the acceleration will be greater, so the slope must get steeper: dw:1352244868726:dw
 one year ago
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