How Do You Solve Physics Problem MASS 7.1?

  • Thread starter Thread starter Hiche
  • Start date Start date
  • Tags Tags
    Physics
AI Thread Summary
The discussion revolves around solving a physics problem related to a box on a frictionless ramp, specifically focusing on calculating acceleration and forces. The user initially struggles to find the correct approach but determines the acceleration to be -2.5 m/s² and the angle to be 14.47 degrees. They calculate the normal force as 17.38 N, but this is deemed incorrect according to the reference site. The conversation emphasizes the importance of drawing a free body diagram (FBD) and resolving forces into their components to accurately analyze the situation. The user seeks clarification on the correct forces acting on the box, particularly the force along the x-axis.
Hiche
Messages
82
Reaction score
0

Homework Statement



The problem is in the attachment.

Homework Equations


The Attempt at a Solution



I didn't know how to answer this after trying many times. Please tell how to answer this question. How to approach it, please.

MASS IS 7.1 NOT 7.6.
 

Attachments

  • fsdfds.png
    fsdfds.png
    15.6 KB · Views: 432
Last edited:
Physics news on Phys.org
You have a graph of velocity vs time.
Can you find the acceleration of the box from this graph? Yes you can.
Can you find the force acting on the box from the acceleration. Again yes.
Do you know of any other forces acting on the box? ie draw a FBD.
Resolve your force(s) into x and y components and compute.
remember -- > frictionless ramp.
 
Okay.

So I found that the acceleration is -2.5 m/s2. I then found that the theta (angle) is 14.47, which is, according to the site, true. Since the net force along the y component is 0 N, then according to Newton's law, N - mgsin@ = 0. (@ is theta). N is then 17.38 N.

However, it is wrong according to the site. Anything wrong?

Oh, and the mass is 7.1 not 7.6.
 
Would not the force along the x-axis be mgsin@? And that is the force that slows the box down.
If you drew the FBD, the normal force, N, would then be what.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

How Much Mass is Needed to Prevent the Wheel from Rotating?
Replies
1
Views
8K
Energy required to make 2.0 kg of steam
Replies
3
Views
2K
Potential difference to achieve speed
Replies
4
Views
2K
Trying to Calculate k, using Hooke's Law
Replies
3
Views
2K
Car collision: decomposing momentum in x- and y-direction
Replies
5
Views
9K
Equilibrium Position of a Hanging Candy Cane
Replies
17
Views
891
Rope tension problem: Mass hanging from a rope tied at an angle
Replies
21
Views
962
Coefficient of Restitution for a Hypothetical Collision where masses are not equal after the collision compared to before the collision
Replies
6
Views
1K
Transverse mechanical waves in a steel wire
Replies
10
Views
922
2 Masses attached by a spring in the vertical axis
Replies
8
Views
1K

Hot Threads

Recent Insights

Back
Top