Focus on Concepts, Question 10 - Three forces

AI Thread Summary
The discussion revolves around a physics problem involving a 2.70-kg block subjected to three forces, leading to a displacement of 6.50 m. The forces include a 75N force at a 38-degree angle, a 54N horizontal force, and a 93N force at a 65-degree angle. Participants analyze the forces to determine the final speed of the block after it starts from rest. The original poster indicates that they have resolved the problem and no longer require assistance. The focus remains on applying the appropriate physics equations to find the final speed based on the given forces and displacement.
Physicsmoron
Messages
2
Reaction score
0

Homework Statement



Three forces act simultaneously on a 2.70-kg block. For clarity the drawings show the forces separately. The block starts from rest and, as a result of the combined action of the forces, undergoes a displacement s, which has a magnitude of 6.50 m. What is the final speed of the block?

First image: angle 38 degrees, F=75N
Second: 54N= Horizontal force
Third: angle 65, F=93N


Homework Equations





The Attempt at a Solution

 
Physics news on Phys.org
Actually I got this. Nevermind.
 
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