Hey guys!
I can't seem the get the right answer for the problem below. I'm really close, but I have no idea what I'm doing wrong. I've attached the question and my work. Any suggestions would be greatly appreciated. Thanks!
At a playground, a child slides down a slide that makes a 42° angle with the horizontal direction. The coefficient of kinetic friction for the child sliding on the slide is 0.20. What is the magnitude of her acceleration during her sliding? Ok so I tried to use the equation ax=-Uk*g to find the...
This homework set has stumped me for the past 2 days. It's due at midnight, and I still don't understand.
One of the questions asks for an algebraic formula to find the magnitude P P of the forces with which two blocks sliding on a horizontal surface together push against each other? Express...
Hi I need help on my homework and i have no idea where to start and my teacher gives us webassign problems but he does not teach us how to do them, he just gives us formulas.. If anyone can help me with at least this problem i'd appreciate it thx
p.s I am struggling help!
A 1400 N...
Another concept my physics prof didn't teach the class. I would love to be able to attempt these problems but I have no idea what these concepts are or the formulas for them. I'm not looking for the answers to these problems here folks, but rather a method in which to solve them. Thanks!
1. A...
Hi,
I'm not sure if I did this right but here is the word problem and the work I've done. If I made any errors, i'd love to know about them!
A sight seen on many bunny hills across Ontario is young skiers pushing on ski poles and gliding down a slope until they come to rest. Observing...
"A box slides down a 30.0 degree ramp with an aceleration of 1.20m/s^2. Determine the coefficient of kinetic friction between the box and the ramp."
I know that the coefficient of kinetic friction is found by kinetic friction / normal force, but the only problems I've delt with in the past...
An Olympic skier moving at 28 m/s down
a 24 degrees slope encounters a region of snowless
ground of coefficient of kinetic friction 0.67.
The acceleration of gravity is 9.8 m/s^2
How far down the slope does she travel
before coming to a halt? Answer in units of
m.
I came up with an...
Coefficient of kinetic friction
I have a mojor physics test thursday (two days) and here is a pretest question that I cannot figure out if anyone can figure it out I'd greatly appreciate it. I actually know what the answer is uk=0.253 I just don't know how to get that answer.
" An apple crate...
Hi all. My physics teacher told me a while ago, that, under certain conditions a situation could be made in which kinetic friction is greater than static friction. He didn't know how this was done. Would anyone here be able to tell me how one would set this situation up and how he would measure...
you are driving a 2500.0 kg car at constant speed of 14.0 m/s on a straight, level, icy road. you slam on brakes and stop after 25.0 m. what is coefficient of kinetic friction between your tires and the icy road?
I have a homework question (due tomorrow) that I cannot figure out how to answer. It is:
This problem involves a single surface with a single unknown coefficient of kinetic friction that can be found. A box starting from rest, slides down along an incline a distance of 8.8 meters. The incline...
A hockey player hits a puck with her stick, giving the puck an initial speed of 5.0 m/s. If the puck slows uniformly and comes to rest in a distance of 20 m, what is the coefficient of kinetic friction between the ice and the puck?
I know that this question must be rather easy, and that my...
kinetic friction -- toughie!
Problem:
A skier weighing 90 kg starts from rest down a hill inclined at 17 degrees. He skis 100 m down the hill and then coasts for 70 m along level snow until he stops. FIne the coefficient of kinetic friction between the skis and the snow. What velocity does...
So, there are two boxes of fruit on a frictionless horizontal surface and are connected by a light string. m1=10kg, m2=20kg. A force of 50N is applied to the 20-kg box.
There are two questions to answer, I already answered a:
Determine the acceleration of each box, and the tension in the...
I'd appreciate if someone could help me out with this:
The first thing I did was to find the mass of the penguin, which is 30 kg. Now I use the equation {v}^2={v_i}^2+2a\Delta x. I come up with:
6.38^2+64.4a=0\implies a=-.632 m/s^2
Now to find the force, I multiplied by the mass 30...
I need help bigtime.
I need to derive an equation for the coefficient of kinetic friction in terms of the acceleration.
and I need to dervie an equation similar to the one above for the kinetic coefficient of friction of an object sliding down an inclined plane. Thanks.
A 12kg block is released from rest on an inclined plane with angle 35. Acceleration of the block is 1.23457 The acceleration of gravity is 9.8m/2^2.
What is the coefficient of kinetic friction for the incline?
I found the normal force (12*9.8*cos35)=96.33228...
If anyone could help me with this, I would be so grateful! I know the answer to the problem is 4.1 m but I don't know how to get there and I have to show my work. Here's the problem:
"A box is given a push so that it slides across the floor. How far will it go given that the coefficient of...
in first situation block is pulled with force F .
in second situation we have the same block with the same force F but under angel 60 degrees.
it is possible that in both situation motion is uniform. ?? (we have friction)
so imo it isn't possible because The block is in the both...
I've worked this problem an dget an answer, but when i enter it into our homework site, it says my answer of 229 N is wrong, do any of you see what I am doing wrong.
A 1.06×102 kg crate is being pulled across a horizontal floor by a force P that makes an angle of 28.9° above the horizontal. The...
I need help with this problem
Bob wants to push a crate horizontally with a force of 100N. If the coefficient of kinetic friction between the crate and the floor is 0.5 and the crate has a weight of 800 N, can he move the crate.
Okay that's the problem and I don't believe that 100N is enough...
help for physics static and kinetic friction.
Question:
A 70 Newtons Penguin is on a 50 N. sled. the static friction between the penguin and sled is 0.671 and the kinetic friction between the sled and the SNOW is 0.119. FInd the maximum horizontal force that can be applied without the penguin...
A 8 kg block is being pulled horizontally on a table by a 6 kg block that hangs in the air by a cord fasten to the 8 kg block over a pulley, there is only friction between the table and the 8 kg block. Both blocks are initially moving with 0,900 m/s and they come to rest after 2 meters.
I have...
A 65.0 kg person, running horizontally with a velocity of +4.06 m/s, jumps onto a 10.4 kg sled that is initially at rest.
(a) Ignoring the effects of friction during the collision, find the velocity of the sled and person as they move away.
Which I figured out was 3.5 m/s...now my question...
I am working on a lab report in which a hockey puck is put on a ramp which is lifted until the puck slides. Displacement, acceleration and time are measured. Can someone help me with the discussion questions? I wanted to be as indepth as possible with my answers, thanks in advance.
1) Assess...
A 25.0 kg seal at an amusement park slides down a ramp into the pool below. The top of the ramp is 1.80 m higher than the surface of the water and the ramp is inclined at an angle of 30.0° above the horizontal. The seal starts from rest and reaches the water with a speed of 4.90 m/s.
A block and disk with equal masses are released from the same height on a 30° incline. The block slides down the ramp while the disk rolls. If they both reach the bottom at the same time, what must be the coefficient of kinetic (sliding) friction?
ANSWER: mk = (1/3)tanX = (1/3)tan(30°)...
A box slides down a ramp inclined at 41 degrees horizonontal with an acceleration of 1.4 m/s^2. The acceleration of gravity is 9.8 m/s^2. Determine the coefficient of kinetic friction between the box and the ramp.
no ideas need any advice
A force of 45.7 N is required to start a 5.0-kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? (b) If the force continues at the same value, the box accelerates at 0.54 m/s^2. What is the coefficient of kinetic...
Ok, here is my dilemma: A flight attendant pulls her 70.0 N flight bag a distance of 253 m along a level airport floor at a constant velocity. The force she exerts is 40.0 N at an angle of 52 degrees above the horizontal. Find the following:
a) the work she does on the flight bag
b) the work...
Need help!
A 1.0x10^3 kg Toyota collides into the rear end of a 2.2x10^3 kg Cadillac stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.8m before stopping. The police officer, knowing that the coefficient of Kinectic friction between the tires and...
Ok, in this problem, I am given theta, which in 30 degrees, and acceleration, which is 1.2 m/s^2. How do I solve for the coefficient of Kinetic friction without the mass? :confused:
here is the problem:
a 0.215 kg metal rod carrying a current of 11.8 A glides on two horizontal rails 0.460 m apart. What vertical magnetic field is required to keep the rod moving at a constant speed if the coefficient of kinetic friction between the rod and rails is .120?
i forgot...
A woman finds herself in a very odd contraption. She sits in a reclining chair, on a freshly waxed floor, in front of a large, compressed spring. The spring is compressed 5.00 m from its equilibrium position, and a glass sits 19.8 m from her outstretched foot.
Assuming the woman's mass is 60.0...
ok, i have a problem and w/o a given mass i am lost on how to solve it.
"What is the coefficient of kinetic friction between the ice and the puck in the problem above?"
problem above states, "A Carolina Hurricanes player hits a puck with his hockey stick during a practice, giving the puck...
Hey guys this question has been stumping me to death! Any help at all would be greatly appreciated.
A mountain climber has tied himself to a rock and has begun to lower himself down a cliff. The rope passes over a frictionless pulley. At time t=0, the rock and the mountain climber are...
Ok here is my situation. There is a problem that states:
Find the friction force if the acceleration of a 500 kg car being towed on a flat surface is 5 m/s2 and a tow truck is pulling with a force of 3550 N.
I do not where to go from here. Furthermore, the next question asks...
Can anyone provide some assistance? I know this comes in two parts, one in locating the velocity, which I believe comes down to v=sq root of 2(9.8)(6.34), however the second part is creating havoc. Any suggestions on part II's formula?
A box slides down a frictionless 6.34 m high hill...
i have two questions that needs help on. thanks in advance
1. You pull a box across the floor with a force of 425 N. The coefficient of kinetic friction is 0.305. The mass of the crate is 125 kg. Angle q = 35.0°. Find: (a) the acceleration of the box and (b) the amount of work done in...
Hey guys,
I have a physics problem that I tried to solve but I am not positive of the answer I got. Can someone guide me through the steps of solving it.
Problem: Two blocks connected by a rope are dragged by a horizontal force (68 N [right]). The first block is 18Kg, the second block...
a 3.00 kg block starts from rest @ the top of a 30-degree and slides 2.00 m down in 1.50s. Find (a) the acceleration of the block (b) the coefficient of kinetic friction between it and the incline, (c) the frictional force acting on the block, and (d) the speed of the block after it has slid...
Been trying to comprehend this one for a few hours:
The coefficient of kinetic friction between a block and an inclined plane is 0.20 and the angle is 60 degrees.
What is magnitude of a? The book says 7.5 m / s^2
How do I figure this with no speeds or distances or even a mass?
Can anyone tell me how to solve the below question?
A 9.0kg hanging weight is connected to a string over a pulley to a 5.0 kg block that is sliding on a flat table. If the coefficient of kinetic friction is 0.15 find the tension in the string.
Here is the problem:
When the jet-powered car "Spirit of America" went out of control during a test drive at Bonnevile Salt Flats, Utah, it left skid marks about 18.70km long. If the car was moving initially at a speed of 661.0km/hr, estimate the coefficient of kinetic friction between the...
Okay, I've never done this before and I sure hope there is somebody out there who can help me. I've tried answering this question EVERY way possible and cannot come up with the right answer.
In a circus performance, a monkey is strapped to a sled nd both are given an initial speed of 4 m/s...
I need help with a physics problem, if someone could help me with the fomula, please.
When mass M is at the position shown, it is sliding down the inclined part of a slide at a speed of 2.23 m/s. The mass stops a distance S2 = 1.85 m along the level part of the slide. The distance S1 =...
When mass M is at the position shown, it is sliding down the inclined part of a slide at a speed of 1.89 m/s. The mass stops a distance S2 = 1.85 m along the level part of the slide. The distance S1 = 1.25 m and the angle theta = 37.7 degrees. Calculate the coefficient of kinetic friction for...