- #1
toyotadude
- 18
- 0
Homework Statement
The Attempt at a Solution
I really am lost after that. Any tips? Did I even write the next force equations correctly? :\
What is the Net Force Acting on an Object on an Inclined Plane?
AI Thread Summary
To determine the net force acting on an object on an inclined plane, focus on calculating the overall net force without needing to distinguish between specific forces like gravity or friction. The problem provides sufficient information, such as distance, time, and mass, to compute the magnitude of the net force. The direction of the net force is assumed to align with the incline but cannot be definitively calculated due to a lack of information regarding friction or other forces. If the friction coefficient were known or if the plane were assumed to be frictionless, direction could be determined. Ultimately, the question primarily seeks the magnitude of the net force.
I really am lost after that. Any tips? Did I even write the next force equations correctly? :\
- #2
collinsmark
Science Advisor
Homework Helper
- 3,440
- 3,334
Use kinematics.
(Hint: the problem statement doesn't ask you to distinguish between gravitational force, frictional force, or any other particular forces. It's only asking you to find the overall net force. Knowing the distance, the time it takes to accelerate over this distance, and finally the mass of the object are all you need to calculate this net force.)
[Edit: Well, enough information is given for you to calculate the magnitude of of the net force. The net force's direction is assumed to be along the direction of the plane, whatever that happens to be. (Don't bother trying to calculate the direction. Not enough information is given.)]
[2nd edit: You could calculate the direction if you knew what the friction coefficient was, or knew you were suppose to assume the plane is frictionless. But since the problem statement doesn't say anything about friction or lack thereof, or whether or not there are some other forces besides the obvious, there's not enough information to determine the direction. I'm guessing the question is just looking for the magnitude.]
(Hint: the problem statement doesn't ask you to distinguish between gravitational force, frictional force, or any other particular forces. It's only asking you to find the overall net force. Knowing the distance, the time it takes to accelerate over this distance, and finally the mass of the object are all you need to calculate this net force.)
[Edit: Well, enough information is given for you to calculate the magnitude of of the net force. The net force's direction is assumed to be along the direction of the plane, whatever that happens to be. (Don't bother trying to calculate the direction. Not enough information is given.)]
[2nd edit: You could calculate the direction if you knew what the friction coefficient was, or knew you were suppose to assume the plane is frictionless. But since the problem statement doesn't say anything about friction or lack thereof, or whether or not there are some other forces besides the obvious, there's not enough information to determine the direction. I'm guessing the question is just looking for the magnitude.]
Last edited:
Neglect gravity other than that of water; neglect friction.
F1=ρgsh=1000*10*1*(1+4)=50000 N;
F1=ρgsh=1000*10*0.1*4=4000 N;
F3=50000-4000=46000 N?
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...
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