# I need help guys please

1. Nov 21, 2008

### Muteb

Hello guys,

I do not know how to solve these problems could you help me please?

1- A satellite of mass 59.0 Kg is being pulled out of orbit by 450.0 Netwons of gravity. Small thrusters are used to maneuver the satellite back to its orbite. What thrust would cause the satellite to move with a constant velocity?

2- A US Army rope has a tensile strength of 5000.0 Netwons- this is the greatest force you may exert on it without breaking. Suppose this rope is used by a soldier rappelling down a building or cliff.
a) What is the maxiumum deceleration of a 50.0 kg rappeller that the rope can withstand?

2. Nov 21, 2008

### Redbelly98

Staff Emeritus
Welcome to PF.

You'll need to show an attempt at solving the problems before receiving help. It's the policy here. In other words, those items that you deleted when you posted need to be addressed.

3. Nov 21, 2008

### Muteb

Force=mass*acceleration so

5000=50*acceleration

acceleration = 5000/50 = 100 m/s^2

4. Nov 21, 2008

### HallsofIvy

Staff Emeritus
Which problem is that supposed to be the answer to?

5. Nov 21, 2008

### Muteb

I think for Q2 that the pushing and pulling forces should be equal and the accerleration is zero.

T-450=(0)X(50)

T=450 T is force

6. Nov 21, 2008

### Muteb

Hello HallsofIvy,
is my answer right or I need to count the Earth's gravity?

7. Nov 21, 2008

### Redbelly98

Staff Emeritus
That's correct for question #1. Just remember to include units.

450.0 N is the force of the Earth's gravity, so you have already counted it.

8. Nov 21, 2008

### Muteb

Thanks Redbelly98, HallsofIvy I apperciate your responsoes