Im having trouble with 10 problems due next wednesday...help guys...I was having a rough week and i don't understand any of this at all. so im gonna need even more help with these than last time 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 im 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 wanna think i have...like i can remember doing a similiar problem in class but im 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 im 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.