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Results tagged with homework-and-exercises
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user 95408
Applies to questions of primarily educational value - not only questions that arise from actual homework assignments, but any question where it is preferable to guide the asker to the answer rather than giving it away outright. Please READ THE GUIDANCE IN META before asking homework-like questions.
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1
answer
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The distance between the two packages [closed]
A package is dropped form an airplane travelling horizontally at constant speed. Friction is negligible. One second later a second package is dropped.
a) THe distance between the two packages will r …
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1
vote
1
answer
156
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Work and energy question
An athlete picks up a $20.0\,\mathrm{kg}$ sandbag from the ground and throws t straight up in the air. It leaves her hands $1.50\,\mathrm{m}$ above the ground and reaches a height of $7.00\,\mathrm{ …
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vote
3
answers
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The formula for the kinetic friction on inclined surface
I'm confused about the formula for the force of friction on inclined surface.
It says that $f$ (force of friction) = $\mu N$ (where $\mu$ is the coefficient of the friction).
Is: $$f = mg\cos(a)\m …
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0
votes
1
answer
59
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Finding the friction before slipping [closed]
There is a string that is attached to a bar as shown below in the picture. What is the coefficient friction between the bar and floor before bar starts slipping.
I have chosen a pivot point about …
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1
vote
2
answers
3k
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The acceleration of the centre of mass [closed]
Given two balls that are thrown straight up in the air at a speed of $40 \:\mathrm{m/s}$, $0.10 \:\mathrm{s}$ apart. One ball is twice the mass of the other. The heavier ball is thrown second.
I …
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0
votes
1
answer
755
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The direction of forces in statics problem
I was always confused on how we define the directions of the forces in equilibrium problems.
Let's say I have a simple structure:
In this case, I assumed that Ray and Rcy are pointing up to counter …
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