What is the resulting acceleration of object B placed on object A?

  • Thread starter Thread starter sedaw
  • Start date Start date
  • Tags Tags
    Laws Newton
AI Thread Summary
The discussion revolves around calculating the acceleration of object B, which is placed on object A, under the influence of a 100N force. The drag coefficient between the two objects is 0.3, with object A weighing 20kg and object B weighing 10kg. The resulting acceleration for object B is stated to be 7.06 m/s², but the method of calculation is questioned by participants. Key formulas mentioned include Newton's second law (ΣF = ma) and the kinematic equation for linear motion (s = 1/2 * a * t²). The thread seeks clarification on how the acceleration was derived and which block the calculations pertain to.
sedaw
Messages
62
Reaction score
0
Object A placed on a floor frictionless and object B placed on object A.
The drag coefficient between A & B is 0.3
The length of A is 1m and the length of B is 30 cm .
a force of 100N workin on object B.
What is the time take to the edge of object B placed on the edge of object A ?


all i received its that acceleration of B a = 7.06



TNX
 
Physics news on Phys.org
ohh i forgat :
mA=20kg
mB=10kg
 
somebody ?

please
 
How did you calculated the acceleration?

Remember that in case of a linear motion: s =1/2*a*t^2.
 
\Sigma_F_=ma
f=ma
mBg*0.3=ma
 
sedaw said:
all i received its that acceleration of B a = 7.06
Did you calculate this or was it given to you? This is the acceleration of which block?
\Sigma_F_=ma
f=ma
mBg*0.3=ma
Which block is this? Please show your work.
 
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}...
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...
Back
Top