Please help w/ homework question, for my class tonight

  • Thread starter tucky
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  • #1
tucky
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I am having a problem with two questions for my homework assignment.

1st question:

A force of 1 N acts on a mass of 1kg for a time of 1 s. (A)What is the acceleration of the mass? (B)What speed does the mass reach? (C)How far does the mass move?

Here is my answer but I think it is wrong:
(A) acceleration=1N/1kg = or 1 meter per second per second
(B) acceleration=change in velocity/time...I am not sure if that is the right equation to use
(C) velocity=change in average position/elapsed time ?

Then the second question that baffled me was:
in terms of power, explain why roads going up mountains are full of switchbacks and hairpin turn?

Is it something to do with the rate at which energy changes from on form to another?

I am really confused! Please help.
 

Answers and Replies

  • #2
Sonty
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Originally posted by tucky

(A) acceleration=1N/1kg = or 1 meter per second per second

This one is good.


I am not sure if that is the right equation to use

Try. What do you have to lose?

Regarding the second question: it's much harder (you need more power) to climb a steeper hill so given a mountain you build roads with a reasonable angle. At that angle you would need a longer mountain so you must make those sharp turns to keep the road on the mountain.
 
  • #3
HallsofIvy
Science Advisor
Homework Helper
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Sonty is completely correct.

In regards to the road, remember that "energy is conserved". Go up a particular distance requires fixed amount of work (mg times height moved) but since work= force times distance, if you go a longer distance you can do the same work using less force.
 

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