1) An object of mass 2.5 kg experiences a force of 12 N towards the east and 5 N

Question

1) An object of mass 2.5 kg experiences a force of 12 N towards the east and 5 N towards the north. The magnitude of the acceleration is _____ m/s2.

2) A wooden block slides directly down an inclined plane, at a constant velocity of 12.0 m/s. What is the coefficient of friction, if the plane makes an angle of 35 degrees with the horizontal?

3) A boy pulls with a force of 20 N on the 300 N wagon. What acceleration does the wagon have?

4) If the distance between two stars increases by a factor of 10, then the gravitational force between them changes by a factor of...

5) Two children of weight 200 N (left) and 250 N (right) sit at opposite ends of a seesaw that is 10 m long. At what point from left side should it be supported to achieve balance?

6) A force of 15 N acting at an angle of 25 degrees to the horizontal is used to pull a box a distance of 5 m across a floor. How much work is done?

7) A 0.5 kg mass is attached to the end of a 1 m string. The systems whirled in a horizontal circular path. If the maximum tension that the string can withstand is 350 N, what is the maximum speed of the mass if the string is not to break.

Explanation / Answer

4.

gravitational force betwenntwo stars if F = G m1m2/d^2

if d increaes 10 times,

F = Gm1m2/100d^2

thus force decreases by 100 times

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