- #1

CDink

- 26

- 0

1.

**A skier traveling at 34.9 m/s encounters a 17.8 degree slope. If you could ignore friction, to the nearest meter, how far up the hill does he go?**

?, ok i know W=mgSin(theta)...i don't know how to put all that in though I am just so confused.

2.

**If the coefficient of kinetic friction in the previous problem was actually 0.12 and the slope 30 degrees, to the nearest meter how far up the hill does he go?**

same.

3.

**You have a mass of 68 kg and are on a 58-degree slope hanging on to a cord with a breaking strength of 200 Newtons. What must be the coefficient of static friction to 2 decimal places between you and the surface for you to be saved from the fire?**

this one i really want to think i have...like i can remember doing a similar problem in class but I am drawing a blank

4.

**In the previous problem if the coefficient of static friction is zero, to the nearest tenth of a degree, what would the incline angle have to be in order for the cord not to break?**

Same.

5.

**The red box has a mass of 20.9 kg and the blue box has a mass of 12.1 kg and the force is 289 N. To the nearest tenth of a m/s2 what is the acceleration of the combination?**

ok I am thinking this one is set up like:

289=a(12.1+20.9)?

how on or off is that?

6.

**To the nearest Newton in problem 5 what force does the blue box exert on the red box?**

im lost on this one.

7.

**A child pulls a wagon with a force of 64 N by a handle making an angle of 11 degrees with the horizontal. If the wagon has a mass of 4.8 kg, to the nearest hundredth of a m/s2 what is the acceleration of the wagon?**

in this one(as in most of these) i feel like i know what i have to do...only the formulas and stuff...im lost

8.

**To the nearest Newton what would be the minimum force applied at that angle which would lift the wagon off the ground?**

same.

9.

**A student stands on a scale in an elevator that is accelerating at 2.2 m/s2. If the student has a mass of 58 kg, to the nearest Newton what is the scale reading?**

i feel incredibly stupid i can't solve this one...

10.

**A 26 kg child sits on a 5 kg sled and slides down a 126 meter, 29 degree slope, to the nearest m/s what is his or her speed at the bottom?**

Same with above.

I feel really dumb that i had to come with this many problems i have no idea how to solve...sorry guys.