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alexyn
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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
 2 years ago
 2 years ago
alexyn Group Title
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
 2 years ago
 2 years ago

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alexyn Group TitleBest 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.
 2 years ago

ksaimouli Group TitleBest ResponseYou've already chosen the best response.1
can u do me a favor can u draw the diagram
 2 years ago

ksaimouli Group TitleBest ResponseYou've already chosen the best response.1
what part u r struck
 2 years ago

ksaimouli Group TitleBest ResponseYou've already chosen the best response.1
ok so (a) FN=mgFsin 20
 2 years ago

ksaimouli Group TitleBest ResponseYou've already chosen the best response.1
i am sorry i am weak at graphs :(
 2 years ago

ksaimouli Group TitleBest ResponseYou've already chosen the best response.1
@ivanmlerner can u help her please
 2 years ago

alexyn Group TitleBest ResponseYou've already chosen the best response.0
thanks for trying though
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.0
It is only in part d that you need help?
 2 years ago

ivanmlerner Group TitleBest 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?
 2 years ago

alexyn Group TitleBest ResponseYou've already chosen the best response.0
Im unsure about the acceleration. I got 0.07 m/s. Is that right?
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.0
Just to be sure, what number are you considering for g?
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.0
10 or 9.8?
 2 years ago

ivanmlerner Group TitleBest ResponseYou've already chosen the best response.0
I'll be back in a few minutes but I got 0.43 with 9.8
 2 years ago

alexyn Group TitleBest ResponseYou've already chosen the best response.0
ok. I got 1.64 m/s now
 2 years ago

furnessj Group TitleBest 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
 2 years ago
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