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...