GravitationHELP!!

[OnlyThorns]

Hey help please. I am so lost. I get most of the problems. but these stump me.

 

 

3. The mass of a robot is 5740 kg. This robot weighs 3440 N more on planet A than it does on planet B. Both planets have the same radius of 1.33 107 m. What is the difference MA - MB in the masses of these planets?

 

4. A passenger is pulling on the strap of a 16.0-kg suitcase with a force of 61.0 N. The strap makes an angle of 37.0° above the horizontal. A 37.8-N friction force opposes the motion (horizontal) of the suitcase. Determine the acceleration of the suitcase.

 

 

5. A 92 kg water skier is being pulled at a constant velocity. The horizontal pulling force is 270 N. (a) Find the magnitude of the total resistive force exerted on the skier by the water and air. (b) Find the magnitude of the upward force exerted on the skier by the water.

[swansont]

Have you done anything on them?

 

Like, for #1, is there an equation for gravitational force that has masses and radius in it?

[LazerFazer]

For two and three, just draw a free body diagram for each situation, and then do a sum of the forces in the x- and y-. It should be simple after that.

 

LazerFazer