Friction and tension force- mass

AI Thread Summary
The discussion revolves around calculating the mass of a cow, Brisket, being pulled up a ramp with friction. The ramp is inclined at 26.6° with a coefficient of kinetic friction of 0.674, and a tension force of 5060.8N is applied. The user initially attempted to use a specific equation but arrived at an incorrect mass of 916.31 kg. Participants suggest analyzing the forces acting on Brisket and applying Newton's second law to find the net force. The key is to express the friction in terms of the normal force and to sum the forces parallel to the incline to solve for the mass accurately.
Paulbird20
Messages
53
Reaction score
0
Friction and tension force-- mass

Homework Statement



In the real world, ramps aren't frictionless, so I had to drag Brisket up a ramp, slanted at 26.6° from the ground, that had a coefficient of kinetic friction = 0.674. I applied a tension force FR=5060.8N to my pet cow using the rope. Brisket moved up the ramp with an acceleration of magnitude 1.54m/s2. With this information, including friction on the ramp, what is Brisket's mass (in kg)?

Homework Equations


T= Uk*m*g/cos(angle)+Uksin(angle)
Fnet= ma


The Attempt at a Solution



I attempted to use the first equation

5060.8 = .674 * m * 9.8 / (cos(26.6)+ .674 sin(26.6)

using this equation i got 916.31 kg which is incorrect

any tips would be much appreciated thanks
 
Physics news on Phys.org


Paulbird20 said:

Homework Equations


T= Uk*m*g/cos(angle)+Uksin(angle)
Where does this formula come from?

Instead, just analyze the forces acting on the cow and apply Newton's 2nd law:
Fnet= ma
 


ok so the forces i have acting on the cow are:

mgsin(angle)
mgcos(angle)
mg
Friction(going up the incline)
N(force)

im not sure how to arrive at Fnet because i need the mass to be able to get the components of it
 


Paulbird20 said:
ok so the forces i have acting on the cow are:

mgsin(angle)
mgcos(angle)
mg
The weight (mg) can be broken into components.
Friction(going up the incline)
Express the friction in terms of the normal force and μ. Which way does it act?
N(force)
Don't forget the tension force.

im not sure how to arrive at Fnet because i need the mass to be able to get the components of it
Find Fnet by adding up all the force components parallel to the incline. (There are three such components.) Set up an equation using Newton's 2nd law and solve for the mass.
 
Thread 'Voltmeter readings for this circuit with switches'
TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
Thread 'Correct statement about a reservoir with an outlet pipe'
The answer to this question is statements (ii) and (iv) are correct. (i) This is FALSE because the speed of water in the tap is greater than speed at the water surface (ii) I don't even understand this statement. What does the "seal" part have to do with water flowing out? Won't the water still flow out through the tap until the tank is empty whether the reservoir is sealed or not? (iii) In my opinion, this statement would be correct. Increasing the gravitational potential energy of the...
Back
Top