All Questions
44
questions
4
votes
3
answers
250
views
Why is my answer for height negative?
Question is simple. A ball is thrown upwards with initial velocity $v_0$. How high does it go up?
Assume down is negative and up is positive and no air resistance.
KE at bottom = PE at the top:
$\...
- 109
0
votes
3
answers
67
views
How do velocities become equal when potential energy is maximum? [closed]
I was given this diagram and asked to find the maximum potential energy during the subsequent motion if one of the blocks is projected with a kinetic energy K initially.
So I did reach upon the answer ...
- 23
-1
votes
1
answer
135
views
From my reference frame, why does the Earth need a huge kinetic energy [$0.5M_E(11200)^2=3.75*10^{32}$ joules] to escape me? [closed]
I wake up screaming into the void, when I see the Earth almost touching me but going away from me at 11.2 $km/s$.
I don't remember what happened before I woke up. I faintly recollect being cannoned up ...
- 1,421
0
votes
1
answer
382
views
A block starts from rest at the top frictionless slide at a height $h_1$ above the ground and leaves the slide perfectly horizontally
A block starts from rest at the top of a frictionless slide at a height h1 above the ground. The block leaves the side moving perfectly horizontally at a height h2 above the ground. The block ...
13
votes
5
answers
4k
views
Why does the incline angle not affect how high a launched object will slide up a frictionless ramp?
I am seeing a problem with the solution given in this book. How did the height of the box have nothing to do with the incline of the ramp? Intuitively it would seem the higher the incline the higher ...
0
votes
1
answer
380
views
Gravitational Potential Energy Lab Confusion
I had a lab that tested the dependence of gravitational potential energy on its position and the goal out of each exercise was to see if kinetic energy equaled potential energy. A cart was on a flat ...
1
vote
1
answer
34
views
Bar released from upright position rotates about a lower hinge before being caught by a steel cable, how to calculate the tension on the cable? [closed]
I wish to check the safety factor of a steel cable that I've designed to catch a heavy bar that rotates freely due to the gravitational force acting on it.
From the upright position, I'm assuming that ...
- 11
0
votes
0
answers
162
views
Hooke's law and elastic potential energy [duplicate]
A mass $m$ is attached to a vertical spring of elastic constant $K$ and length $L$. The spring is supposed to be of negligible mass. Due to the attached mass $m$ the spring reaches a new ...
0
votes
2
answers
130
views
Finding total mechanical energy, given the potential [closed]
The average kinetic energy of a particle in a potential of the form
'$V(x, y)=x^{4}+4 x^{2} y^{2}+4 x^{3} y-2 y^{4}$'
is equal to $T$.
How can we find the total energy of the particle?
My attempt:
I ...
- 1,270
1
vote
0
answers
93
views
Can kinetic and potential energy be converted to thermal energy? [closed]
If they can, can I use the potential energy equation to find out how much the temperature would increase if 1 kg of water is dropped to the ground from 10m height?
- 23
1
vote
1
answer
203
views
Solving Particle in a Box using Newtonian Mechanics [closed]
so I'm trying to solve the one dimensional particle in a box problem known from quantum physics in a classical context. So according to Wikipedia (see picture on the right) we would get a particle ...
- 227
0
votes
2
answers
174
views
To Calculate Kinetic Energy of slippping chain overhanging over a smooth table as a function of length of overhang [closed]
Is it even possible to do so? (With only upto highschool level knowledge of mechanics ie without the use of things like Lagrangian mechanics if that is even useful here).
I know how the mass will be ...
- 205
0
votes
1
answer
142
views
Find the potential energy of this object when it is on the ground of the Earth [closed]
A mass $M=1kg$ has potential energy $U=0$ when the distance to the Earth is $\infty$. Find the potential energy of this object when It's on the ground of the Earth. (The potential energy of the object ...
- 699
0
votes
2
answers
3k
views
Energy change as ball rolls down a curved ramp [closed]
At the top of the ramp, the ball has gravitational potential energy. As the ball rolls down the ramp, the potential energy converts to kinetic energy. Due to friction, some energy is also converted to ...
- 33
2
votes
3
answers
4k
views
Work - Energy confusion when movement is vertical/up a slope
I've always thought of work done on an object as the energy transferred to it. This explanation, however broke down when I came across the following situation :
A block of mass $m$ is transported to a ...
- 163