Newton's Laws and finding acceleration

AI Thread Summary
To find the final velocity of a 1.0 kg brick sliding down a 30-degree inclined ice roof after 0.90 seconds, the relevant equations of motion and Newton's laws are applied. The net force acting on the brick can be calculated using Fnet = ma, where 'm' is the mass and 'a' is the acceleration due to gravity along the incline. The initial velocity is zero since the brick starts from rest. The final velocity can be determined using the equation v_f = v_i + at, with the appropriate values substituted for acceleration and time. This approach provides a clear method to solve the problem without friction.
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Homework Statement



A brick of mass 1.0 kg slides down an ice roof inclined at 30 degrees with respect to the horizantal. If the brick starts from rest, how fast is it moving when it reaches the edge of the roof 0.90s later? Ignore friction


Homework Equations



Fnet = ma
v2 = v1 + 1/2 at^2

The Attempt at a Solution



I have no idea where to start with this problem. I attempted to find acceleration but just have no clue what to do :S any help would be great thanks !
 
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Hi and welcome to physics forums!Try using:

v_f=v_i+at

Where

v_f = final velocity

v_i = initial velocity

a = acceleration
t = time

What are the values for the variables listed above?
 
Last edited:

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...
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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...
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