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Results tagged with homework-and-exercises
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user 208138
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.
1
vote
2
answers
707
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Slope of $x$-$t²$ curve (displacement vs time squared)
I know that slope of $x$ vs $t^2$ curve gives $\frac{a}{2}$. How do I prove it?
This is what I did :
$x = ut + \frac{at^2}{2}$
$x = \frac{at^2}{2}$ (for $u=0$)
$\frac{dx}{dt^2} = \frac{a}{2 …
- 876
1
vote
3
answers
271
views
Massless string vs massless spring in a mass-spring system
Two masses connected by a massless spring, on a frictionless surface , and a force of $60$N is applied to the 15kg mass such that it accelerates at 2 $\frac{m}{s^2}$. What is the acceleration of …
- 876
0
votes
1
answer
163
views
Application of Newton's laws : A system of three blocks [closed]
This is a question from my physics coursebook. Everything in the picture should be self-explanatory. Pulley and string are massless. There is friction between contact surfaces of block A and block C …
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1
vote
0
answers
42
views
How do I prove that this force equation is wrong? [duplicate]
Ok this is a simple setup. Pulley is massless and frictionless. String is massless. Pulley is fixed to a wall. The question asks me to find out the acceleration of the two blocks and the tension forc …
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0
votes
1
answer
322
views
Newton’s second law - a uniform massive rope on a wedge
I am trying to understand this problem intuitively. The wedge accelerates to the left with $a$. According to the solution, the rope on the left must accelerate down the slope with $a\cos\alpha$? And …
- 876
0
votes
1
answer
2k
views
Friction acting between road and tyres of a car
This is a sample problem from the book by Resnick Halliday & Krane (5th edition), page no 98-99.
I understand the kinematics and force equations used in this problem. I don’t understand a few thin …
- 876
2
votes
1
answer
99
views
Motion involving Constraint relations
We have the setup as shown in the picture. Two blocks A and B are connected by a string that always remains taut. Block A is on a frictionless surface. Block B is being pulled downwards with a consta …
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0
votes
1
answer
476
views
Is it possible to determine the motion of a vehicle moving at a constant speed of $0.8c$?
Suppose you are in a rocket with no windows, traveling in deep space far from other objects. Without looking outside the rocket or making any contact with the outside world, explain how you could d …
- 876
1
vote
1
answer
987
views
Direction of acceleration vector at the apex of a curve
(Test Your Understanding of Section 3.2)
The question wants me to choose the correct acceleration vector, from the given 9 options where 9th option is zero acceleration.
Ok, first I thought option …
- 876
0
votes
2
answers
710
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How is the external force and the tension force related in this system [closed]
Two bodies, A and B, are connected by a string. The string is massless, inextensible, and is always tight. Also, the surface they are on is frictionless. There is an external force $F_{applied}$ act …
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