All Questions
13
questions
0
votes
1
answer
71
views
Projectile Vectors Speed
At time $t = 0$, a projectile of mass $m$ is launched from the origin at an angle $α$ to the
horizontal with speed $U$.
Let the position vector of the projectile be $\mathbf{r} = x\mathbf{i}+z\mathbf{...
user1071088
1
vote
1
answer
260
views
How to get the necessary acceleration for a block to remain in place when pushed by a wedge?
The problem is as follows:
The figure from below represents a wedge which has a mass $M$ which is
being pushed by a force $F$. On the top of the wedge there is a small
block whose mass is $m$. Assume ...
- 4,185
0
votes
2
answers
79
views
How to find the acceleration of a cart sliding over a wire?
The problem is as follows:
The diagram from below shows a cart has a mass of $2\,kg$ is carrying
a solution of sucrose as ballast which has a mass of $6\,kg$. Below
the cart there is a brass sphere ...
- 4,185
0
votes
1
answer
35
views
How to find the modulus of the tension of a wire when a sphere is over a bar?
The problem is as follows:
The figure from below shows a system which is at equilibrium. The
sphere is frictionless, homogeneous and its mass is $5\,kg$. The
homogeneous bar has a mass of $10\,...
- 4,185
1
vote
2
answers
337
views
How to find the tension in a wire connecting three spheres?.
The problem is as follows:
The diagram from below shows three spheres identical in shape and weigh $6\,N$. The system is at static equilibrium. Find the tension in Newtons ($\,N$) of the wire ...
- 4,185
0
votes
1
answer
46
views
How to find a force when a pair is given in a diagram with an acceleration?
The problem is as follows:
A body of $5\,kg$ of mass is at rest when $x=0$. suddenly, two forces $\vec{F_{1}}$ and $\vec{F_{2}}$ act on the body applying on it an acceleration of $10\frac{m}{s^{2}}$ ...
- 4,185
1
vote
2
answers
778
views
How do I find the minimum force to be applied to a block sliding in a incline such as it moves with constant velocity?
The problem is as follows:
The figure shows a block over an incline. Find the minimum force that must be applied to the block so that the body of mass $m=2\,kg$ such as that body moves with constant ...
- 4,185
0
votes
0
answers
143
views
How can I find the horizontal contact force between two circles?
The problem is as follows:
The figure from below shows a rectangular object entirely flat which
is placed over two circles of radius $R$. The superficial mass density
of the object is $\sigma$ ...
- 4,185
0
votes
1
answer
107
views
How can I find the tension in a wire when an equilibrium system makes a closed loop?
The problem is as follows:
Find the tension on wire labeled (1) as shown in the figure.
The alternatives given in my book are as follows:
$\begin{array}{ll}
1.&\frac{1}{2}mg\\
2.&mg\\
3.&...
- 4,185
0
votes
1
answer
79
views
Find reactive force at equilbrirm of a person pulling a vertical rope around pulley?
The problem is as follows:
The figure from below describes a machine where a phone technician
whose weight is $80N$ is standing over a flat platform which has a
$30N$ of weight. If the system ...
- 4,185
0
votes
1
answer
67
views
Trivial Algebra with a vector.
I'm currently working on a standard two-body physics problem and am stuck on what I'm assuming is trivial algebra.
For the following expression
$$ L = \frac{1}{2} a\mathbf {\dot r_1}^2 + \frac{1}{2}...
- 1,021
5
votes
1
answer
772
views
Particle on vertex of a polygon moving towards adjacent particle.
Suppose we have a regular polygon with $n$ sides. On each vertex, there is a particle. Every particle moves in such a way that its velocity vector $(\vec{v})$ always points towards particle next to it....
- 7,551
1
vote
3
answers
4k
views
Angles and forces
Two forces of 40 pounds and 28 pounds act on an object. The angle between the two forces is 65 degrees. Find the magnitude of the resultant force to the nearest pound. Using this answer, find the ...
- 37