Solving Homework Equations for Speed

  • Thread starter Thread starter Power of One
  • Start date Start date
  • Tags Tags
    Homework Speed
AI Thread Summary
The discussion focuses on solving two physics problems involving energy conservation. For the wooden block, the potential energy stored in the spring can be calculated using the formula Us = 0.5kx^2, leading to a speed calculation when the block is released. In the second problem, the crate's gravitational potential energy as it slides down the ramp can be converted to kinetic energy to find its speed at the bottom. Both scenarios emphasize the principle of energy conservation, where potential energy transforms into kinetic energy. Understanding these concepts is crucial for accurately determining speeds in both cases.
Power of One
Messages
23
Reaction score
0

Homework Statement


1. An 85 g wooden block is set up against a spring. The block is pushed into the spring, compressing it a distance of 2.0cm and then released. k= 78N/m. What is the speed of the block when it reaches its initial point.

2. A 5.0kg crate slides down a smooth ramp that is elevated at an angle of 38 degrees. length of ramp= 2m. What will be the speed of the crate at the bottom of the ramp?


Homework Equations


Us= .5kx^2
Ug= mgh
KE=.5mv^2

The Attempt at a Solution


1. Us= .0156J? I don't know how to find its speed.

Any help you can provide is appreciated. Thanks in advance.
 
Physics news on Phys.org
The solution to both questions lie in the idea of conservation of energy.
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Distance of box pushed up incline by spring
Replies
1
Views
3K
Calculate speed of block at the end of the ramp
Replies
10
Views
5K
Block moves down incline, hits spring, find spring constant
Replies
3
Views
3K
Can anyone me with this spring question?
Replies
23
Views
9K
Maximum speed of a box compressing a spring on an inclined p
Replies
6
Views
2K
Finding the speed of the block for one and two springs
Replies
5
Views
10K
Calculate Inertia: What is the Mass of the Crate?
Replies
5
Views
6K
Draw a FBD, calculate tension in the string, determine mass
Replies
8
Views
3K
What is the magnitude of acceleration for a block released up an inclined plane?
Replies
10
Views
5K
Physics spring/crate hits another spring problem
Replies
3
Views
6K

Hot Threads

Recent Insights

Back
Top