Homework Statement
Two blocks m (16kg) and M (88kg) are as shown in the figure. If the co-efficient of friction b/w the blocks is 0.38 but the surface beneath the block is frictionless, what is the minimum force required to hold m against M?
How would you go about solving this kind of a...
The two blocks shown above are sliding across a frictionless surface by a force F from the left. The two blocks are not attached but the coefficient of static friction between the two is μs = 0.39. The mass of the smaller block is m1 = 14 kg and the mass of the larger block is m2 = 80 kg.
a)...
Homework Statement
The coefficient of static friction is 0.621 between the two blocks shown. The coefficient of kinetic friction between the lower block and the floor is 0.129. Force F causes both blocks to cross a distance of 5.10 m, starting from rest. What is the least amount of time in...
Homework Statement
Two blocks are connected by a rope F (Vertical in the drawing, with force F pulling on a rope, block 1 attached to that rope, then there ia another rope off the bottom of block 1 that attaches to block 2). The block starts from a rest and moves upward a distance of 3.00m in...
Homework Statement
Block A (M1-5 kg) is on a horizontal surface and block B (M2-2 kg)to the left resting on a 30 degree incline. the two are connected to each other by a mass-less rope over a massless pulley and are moving down hill (to the left) at constant velocity.
a) Find the...
Homework Statement
Part 1
Two blocks are in contact on a frictionless table. A horizontal force F is applied to M2, as shown. If M1 = 1.03 kg, M2 = 3.40 kg, and F = 5.10 N, find the size of the contact force between the two blocks...
A 4 kg block is placed on top of a 8kg block, placed on a table with no friction,which is subject to force of 30N. What is the coefficient of friction needed between the two blocks so that the the top doesn't slide on the other one?
What i did was find the acceleration of the bottom block and...
Homework Statement
A 1-lb block and a 100-lb block are placed side by side at the top of a frictionless hill. Each is given a very light tap to begin their race to the bottom of the hill. In the absence of air resistance, what can you conclude about the outcome of the race?
Homework...
Homework Statement
Two blocks, of masses M = 2.1 kg and 2M are connected to a spring of spring constant k = 210 N/m that has one end fixed, as shown in the figure below. The horizontal surface and the pulley are frictionless, and the pulley has negligible mass. The blocks are released from...
Homework Statement
Two blocks are connected by a rope that passes over a set of pulleys. One block has a weight of 412N and the other has a weight of 908N. The rope and the pulleys are massless and there is no friction. (a) What is the acceleration of the lighter block? (b) Suppose that the...
Homework Statement
A 3.0-kg block sits on top of a 5.0-kg block which is on a horizontal surface. The 5.0-kg block is pulled to the right with a force F. The coefficient of static friction between all surfaces is 0.60 and the kinetic coefficient is 0.36.
a)What is the minimum value of F...
Homework Statement
A slender rod AB of weight W is attached to blocks A and B which move freely in the guides shown. The constant of the spring is k, and the spring is unstretched when \theta = 0. (a) Neglecting the weight of the blocks, derive an equation in W, k, l, and \theta which must be...
Homework Statement
A block of mass M_1 rests on a block of mass M_2 which lies on a frictionless table. The coefficient of friction between the blocks is \mu . What is the maximum horizontal force which can be applied to the lower ( M_2 ) block for the blocks to accelerate without...
Homework Statement
Two blocks are sliding to the right across a horizontal surface, as the drawing shows. In Case A the masses of both blocks are 2.2 kg. In Case B the mass of block 1, the block behind, is 7.0 kg, and the mass of block 2 is 3.5 kg. No frictional force acts on block 1 in either...
Homework Statement
Block A of mass 2M hangs from a cord that passes over a pulley and is connected to block B of mass 3M that is free to move on a frictionless horizontal surface. The pulley is a disk with frictionless bearings, having a radius R and moment of inertia 3MR^2. Block C if mass...
Homework Statement
The coefficient of kinetic friction between the two blocks is 0.30. The surface of the table and pulleys are frictionless.
m1=2 kg
m2=3 kg
m3=10 kg
Homework Equations
\SigmaF=ma
T2-m3g=m3a
T1-T2=m2a
friction-T1=m1a
The Attempt at a Solution
T2=m3g+m3a...
A block of wood of mass m1 = 0.15 kg slides to the right on a frictionless horizontal table with an unknown speed. It collides with a second piece of wood of mass m2 = 0.30 kg which is stationary and attached to a spring with a spring constant of k = 159.00 N/m. The two pieces of wood stick...
Homework Statement
An 8.52g bullet is fired into a 385g block that is initially at rest at the edge of a table of h = 1.03 m height. The bullet remains in the block, and after the impact the block lands d = 2.15 m from the bottom of the table. How much time does it take the block to reach...
Homework Statement
The coefficient of static friction is 0.55 between the two blocks in Figure P8.32. The coefficient of kinetic friction between the lower block and the floor is 0.20. Force FT causes both blocks to cross a distance of 5.0 m, starting from rest. What is the least amount of...
Homework Statement
We have two block of mass that rest upon each other. A force is applied to the top block and that cause both of the blocks to accelerate at different rates. What are the coefficient of friction needed to achieve this, assuming that bottom block rest on a frictionless...
Homework Statement
A block of mass m1 = 2 kg rests on a table with which it has a coefficient of friction µ = 0.75. A string attached to the block passes over a pulley to a block of mass m3 = 4 kg. The pulley is a uniform disk of mass m2 = 0.5 kg and radius 15 cm. As the mass m3 falls, the...
Homework Statement
Two blocks connected with a massless rope ,are being dragged by a horizontal force.suppose F= 68N, Mass1= 12 ,Mass2=18kg and coeffecient of fraction between each block and surface is 0.10.
12kg ------T--------18kg-----68N--->
Find tension and magnitude of the aceleration...
Homework Statement
Two blocks are connected by a very light string passing over a massless and frictionless pulley . The 20.0 N block moves 75.0 cm to the right and the 12.0 N block moves 75.0 cm downward.
Find the total work done on the 20 N block if \mu _s\;=(coeff. of static...
Homework Statement
Two blocks, A and B remain stuck together as they are pulled to the right by a force F = 200 N to the horizontal right. B is on a rough horizontal tabletop (coefficiant of kinetic friction is .800)
a) what is the acceleraton of the system
b) what is the force of friction...
Homework Statement
Two blocks on a frictionless horizontal surface are connected together by a massless string. A second massless string is attached to the block of mass m2, as shown. Suppose you pull on this second string with a horizontal force directed to the right.
Determine the ratio...
Homework Statement
Two blocks connected by a rope of negligible mass are being dragged by a horizontal force Fvec. Suppose Fvec = 70.0 N, m1 = 11.0 kg, m2 = 26.0 kg, and the coefficient of kinetic friction between each block and the surface is 0.100.
Determine the tension T.
Diagram: [ m1 ]...
Homework Statement
m_1, v_1f
m_2, v_2f
m_2 = m_1 = m
Homework Equations
KE = .5mv^2
W = F*d
spring: F= -kx
pot energy = PE = -.5kx^2
The Attempt at a Solution
A) K + U = .5m(v_1f)^2 + .5m(v_2f)^2 - .5kx^2
.5(.1kg)(v_1f)^2 + .5(.1kg)(v_2f)^2 -.5(100N/m)(.02m)^2
B) ...
Homework Statement
say we have a block resting on a incline of a wedge (the incline is 40 degrees). the wedge is on a scale(mass of block is .2 kg and mass of wedge is .8kg).if the block is at rest (due to to static friction) the scale would read 9.8N. but let's say we eliminate the friction...
Homework Statement
Two blocks are connected by a light string passing over a pulley of radius 0.35 m and moment of inertia I. The blocks move (towards the right) with an acceleration of 1.50 m/s2 along their frictionless inclines (see the figure)...
A 3.5 kg block (m1) and a 1 kg block (m2) are connected by a string and are pushed across a horizontal surface by a force applied to the 1 kg block as shown below. The coefficient of kinetic friction between the blocks and the horizontal surface is 0.3. If the magnitude of vector F is 27 N...
Homework Statement
The two blocks are connected by a light string that passes over a frictionless pulley with a negligible mass. The 3 kg block lies
on a rough horizontal surface with a constant coefficient of kinetic friction 0.1. This block
is connected to a spring with spring...
Homework Statement
the force is given as F
the distance pushed is given as D
Homework Equations
W= F*d
F=ma
KE = 1/2 mv^2
The Attempt at a Solution
the blocks have the same kinetic energy
Homework Statement
the force is given as F
the distance pushed is given as DHomework Equations
W= F*d
F=ma
KE = 1/2 mv^2The Attempt at a Solution
the blocks have the same kinetic energy
Homework Statement
This is a problem that I am trying to help my friend with. I understand how to solve this problem the traditional way by rotating the axes of the block on the inclined plane, but then my friend asked me to show him how the answer is the same with non-rotated axes.
There...
I have tried to get this problem many different ways but still don't get it.
A 1.00 kg aluminum block and a 8.00 kg copper block are connected by a light string over a frictionless pulley. The two blocks are allowed to move on a fixed steel block wedge (of angle θ = 40.0°) as shown in Figure...
Homework Statement
Two masses are connected by a string which passes over a frictionless, massless pulley. One mass hangs vertically and one slides on a horizontal surface. The horizontal surface has a coefficient of kinetic friction 0.2. The vertically hanging mass is 4.0 kg and the mass on...
forces act on blocks A and B, which are connected by a string. Force FA = (15 N) i acts on block A, with mass 5.0 kg. Force FB = (24 N) i acts on block B, with mass 6.0 kg. What is the tension in the string?
Fa Fb
-> ->
[A]---[B]-->
F=ma
(15N+24N)=(5.0kg+6.0kg)(a)...
Homework Statement
20: Two boxes are sitting on top of one another. The top box has a mass of 5kg and is connected to the wall by an unstretched spring, k=2000N/m. The bottom box is 10kg. the static friction coefficient between the 2 boxes is 0.5, the kinetic friction coefficient between the...
Whoops, I know i made another post but i didnt realize i have another question that i left blank:
The weight of the block on a table is 452 N and that of the hanging block is 220 N. Ignore all frictional effects, and assuming the pulley to be massless.
What is Acceleration of the two...
Here's the problem:
http://img187.imageshack.us/img187/5958/showmenq5.gif
A block of mass m1 = 1 kg rests on a table with which it has a coefficient of friction µ = 0.52. A string attached to the block passes over a pulley to a block of mass m3 = 3 kg. The pulley is a uniform disk of mass...
[SOLVED] Two blocks - one on a table and one hanging - acceleration with friction
Homework Statement
h ttp://bildr.no/view/186531
that's a link to an image of the problem
Block A (mass 2.25kg) rests on a table top, it is connected by a horizontal cord passing over a light , frictionless...
Homework Statement
There are two blocks touching each other, block A, and block B. Block A is being pushed by a force, which in turn moves block A and B at the same time. Block A has a mass of 4kg, block B has a mass of 1kg. (so the force is pushing the larger block, which is pushing the...
[SOLVED] conservation of energy
Homework Statement
Two blocks, of masses M = 1.9 kg and 2M are connected to a spring of spring constant k = 220 N/m that has one end fixed, as shown in the figure below. The horizontal surface and the pulley are frictionless, and the pulley has negligible mass...
Homework Statement
Two blocks of mass m1 and m2 (m1 > m2) slide on a frictionless floor and have the same kinetic energy when they hit a long rough stretch (coeff. of kinetic friction > 0), which slows them down to a stop. Which one goes farther?
Homework Equations
W = Fd..iono...
Two blocks with different mass are attached to either end of a light rope that passes over a light, frictionless pulley that is suspended from the ceiling. The masses are released from rest, and the more massive one starts to descend. After this block has descended a distance 1.40 , its speed is...
Homework Statement
Block A is on top of Block B, which is on a frictionless incline. The mass of Block A is less than that of Block B. The positive x-direction is defined to be up the ramp.
During the interval from t1 to t2 a hand exerts a constant force on block A in the positive...
Homework Statement
Two blocks with different mass are attached to either end of a light rope that passes over a light, frictionless pulley that is suspended from the ceiling. The masses are released from rest, and the more massive one starts to descend. After this block has descended a...
Two blocks are in contact on a frictionless table. A horizontal force F is applied to M2, as shown. If M1 = 1.51kg, M2 = 3.96kg, and F = 4.55N, find the size of the contact force between the two blocks.
So first I found the acceleration (F=ma)
4.55/(1.51+3.96) = 0.83 = acceleration
Im...
SOLVED :)
Homework Statement
https://tycho-s.phys.washington.edu/cgi/courses/shell/common/showme.pl?courses/phys114/winter08/homework/04d/2blocks_incline_NWT/5.gif
The figure shows two identical blocks tied together with a string which passes over a pulley at the crest of the inclined...
Hope someone can help me with this one. I have two blocks with m1 and m2 connected to two pulleys. I need to figure out T1, T2, a1, and a2 using only the values of g, m1, and m2. But I've been unable to come up with an equation that will work with it. I have a picture attached.
I tried using...