need some college Physics help, L@@K Smart PEoPLe

[trashcop 80s 80s]

We are working on newtons laws right now. I have a webassign due tomorrow and there are two problems that I keep fuCKing up on. I think friction being added in there is what is messing me up. If anyone is smart enough to do these please help me out. KTHANKSDUDEE


A 2.00 kg block is held in equilibrium on an incline of angle = 55° by a horizontal force applied parallel to the floor. If the coefficient of static friction between block and incline is µs = 0.300, determine the following.

(a) the minimum value of
N
(b) the normal force exerted by the incline on the block
N


and....



A 4.7 kg penguin sits on a 10 kg sled. A horizontal force of 50 N is applied to the sled, but the penguin attempts to impede the motion by holding onto a cord attached to a wall. The coefficient of kinetic friction between the sled and snow, as well as that between the sled and the penguin, is 0.17.

(b) Determine the tension in the cord.
N

(c) Determine the acceleration of the sled.
m/s2

oh, and assume that the penguin's cord is massless and non-elastic, the wall is also non-elastic

[george graves]

A.) "a horizontal force applied parallel to the floor" - surely you mean a VERTICAL force over a frictionless pulley at the end of the ramp. A Drawing would help.

Compute the normal force - and your have way there..

Dude - it's 3 or 5 equations for part b...not hard - if you that this is hard - wait till light and mag's...


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[trashcop 80s 80s]

Dude - it's 3 or 5 equations for part b...not hard - if you that this is hard - wait till light and mag's...


....

I just suck at physics so it's pretty difficult to me. I made a shitty 77 on my first test. Trig is a prereq for this class, and I am taking trig as a coreq instead, plus i'm taking chemistry. I'm not the best at math so I shouldn't have tried to take physics and trig at the same time.

[craig4ie]

alright mang

#1, find the normal force first, if you have a text, read it and do examples, if you don't, buy a Schaums Outline or hit the bottom of this page http://en.wikipedia.org/wiki/Inclined_plane

to get you started the normal force is (2kg)*(9.81m/s^2)cos(55deg)
the accelerating force in the direction of the slope is (2kg)*(9.81m/s^2)sin(55deg). Find the horizontal portion of the accelerating force and friction force and do a force balance....DRAW DIAGRAMS

Friction Force(horiz) + Applied Force = Accelerating Force(horiz)

#2, force balance, put all the forces in one direction on one side, and all the forces in the other direction on the other side, solve...