All Questions
12
questions
-4
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1
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Find the acceleration of a block sliding down on an accelerating inclined place [closed]
I don't understand the solution provided in the image. Using Newton's second law for forces along the x-axis (parallel to the inclined plane), shouldn't the equation be $ma = mg\sin \theta+ mb\cos \...
1
vote
2
answers
252
views
Chain hitting a scale
a standard problem in textbooks is to calculate the force of a chain of length $L$ as it hits a scale and has fallen a length $x$. It is found to be $3gMx/L$ by the gravitational force $xmg/L$ and ...
- 139
0
votes
1
answer
96
views
Confusion as acceleration seen from different angles disagree with each other
Heres the question:
Find the tension in the chord when the balls height above the lowest position is $\frac{1}{2}L$. Answer should be in terms of $g$ and $m$.
The solutions manual decided to orient ...
1
vote
1
answer
43
views
What is opposite to $\mathbf{w}_\parallel$ in a FBD of a box on a ramp?
I tried doing research on this but to no avail so my question is this:
If the normal force of an object with mass $m$ on a ramp inclined with angle $0<\theta<90^\circ$ is equal and opposite to ...
0
votes
2
answers
91
views
Where do we use the maximum? [closed]
In the above problem,we have been asked to find the maximum value of $\frac{M}{m}$. But the solution the book ended up giving is the normal balancing of forces in free body diagram and came up with ...
- 1,179
-1
votes
4
answers
568
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Net Force of Equal and Opposite Gravitational Forces Don't Equal Zero? [duplicate]
I've come across this question, and I'm at at a loss.
Two masses, m and M, are in an isolated system. The gravitational forces, F (by M on m) and F (by m on M), are equal and opposite. Why do they ...
2
votes
1
answer
2k
views
Pulley System - How the blocks will move?
I have been given the above question, with the solution,
One correction I observed from the answer was, in question c part would be acceleration of m1 and m2 are same and equal to g
Now the ...
- 419
0
votes
1
answer
78
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What is total force in this context?
One site said the total forces is the sum of the vectors. My homework question is "A skydiver of mass 90 kg is falling with a terminal speed of 60 ms-1. What does that mean? What is the total force ...
- 1,660
0
votes
1
answer
2k
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What force acts on a coin that has been tossed when it is half way to the top? and what force acts on it when it is at the top?
This is a homework question and it appears to be a misleading question. I think that the answer is gravity for both of them. The only alternative answer I have is kinetic energy half way up and ...
- 1,660
3
votes
2
answers
1k
views
Why are some forces not included in the sum of forces?
I was given the following notes in class:
4.32 A skier of mass $65.0\text{ kg}$ is pulled up a snow-covered slope at constant speed by a tow rope that is parallel to the ground. The ground ...
- 239
0
votes
3
answers
2k
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Solving for Normal Force
I'm working through The Nature of Code, which is an awesome book, lots of fun.
I've come across Exercise 3.13 and I'm not sure how to solve it. I'm assuming that the force of gravity and the force of ...
- 101
4
votes
4
answers
9k
views
Visualizing Tension in FBD -- Rope With Mass
Asked to find the tension of a point that is halfway up a rope (where the rope has mass), given the system:
The solution to the problem (FBD included) is as follows. In this diagram ($T_m = $tension ...
- 41