Hey guys (and girls),
I've gotten stuck on my physics questions and have been searching on the web and flipping through my school textbook to figure out how to do these questions. I've finished most of my booklet but I amd ever so stuck on these questions. I hope you can help!
.
Please include all formulas and work done in order to achieve the answer so that I can learn from the steps, thank you!
.
1) A heavy metal chain with mass 0.60kg hangs over the edge of a table. When half of the chain is hanging over the ledge, what is the magnitude of the net external force that causes the chain to accelerate?
(..............My own note: my best guess with this one was that it was the force of gravity, I was able to calculate acceleration and all that, but my teacher wants it in steps so I can't use acceleration to help calculate this force. I have no idea of what to do...........)
.
2) An object with the mass 0.60kg hangs from a string over a pulley with a 1.20kg cart on the table free to accelerate without friction. Assume the 0.60mass and the cart to be a single unit.
.
a) What is the total mass accelerated
(I'm guessing its 1.80kg)
.
b) What is the magnitude of the force causing the acceleration
(I have no idea about this one)
.
c) Calculate the acceleration of the two objects by treating them as a single unit
(I only know how to do this with the masses separate, help?)
.
3) A 1260kg car accelerates from rest to 2.77m/s[forward] in 10.0s.
.
a) Calculate the acceleration of the car
(I don't know if I need to include the mass here but my attempt at solving the question was 2.77m/s^2[forward])
.
b) Calculate the net force acting to accelerate the car
(Here I used my attempt at the acceleration and got 3490N [forward])
.
c) Calculate the displacement of the car during its acceleration
(I'm stuck here as well)
.
.
That's all my questions! I hope all of you can help me. Thank you so very much! :D
.
.
And remember, please (seriously, please with a cherry on top) show the formula and all your work before arriving at the answer so I can learn from your steps)!
.
.
Once again THANK YOU!
I've gotten stuck on my physics questions and have been searching on the web and flipping through my school textbook to figure out how to do these questions. I've finished most of my booklet but I amd ever so stuck on these questions. I hope you can help!
.
Please include all formulas and work done in order to achieve the answer so that I can learn from the steps, thank you!
.
1) A heavy metal chain with mass 0.60kg hangs over the edge of a table. When half of the chain is hanging over the ledge, what is the magnitude of the net external force that causes the chain to accelerate?
(..............My own note: my best guess with this one was that it was the force of gravity, I was able to calculate acceleration and all that, but my teacher wants it in steps so I can't use acceleration to help calculate this force. I have no idea of what to do...........)
.
2) An object with the mass 0.60kg hangs from a string over a pulley with a 1.20kg cart on the table free to accelerate without friction. Assume the 0.60mass and the cart to be a single unit.
.
a) What is the total mass accelerated
(I'm guessing its 1.80kg)
.
b) What is the magnitude of the force causing the acceleration
(I have no idea about this one)
.
c) Calculate the acceleration of the two objects by treating them as a single unit
(I only know how to do this with the masses separate, help?)
.
3) A 1260kg car accelerates from rest to 2.77m/s[forward] in 10.0s.
.
a) Calculate the acceleration of the car
(I don't know if I need to include the mass here but my attempt at solving the question was 2.77m/s^2[forward])
.
b) Calculate the net force acting to accelerate the car
(Here I used my attempt at the acceleration and got 3490N [forward])
.
c) Calculate the displacement of the car during its acceleration
(I'm stuck here as well)
.
.
That's all my questions! I hope all of you can help me. Thank you so very much! :D
.
.
And remember, please (seriously, please with a cherry on top) show the formula and all your work before arriving at the answer so I can learn from your steps)!
.
.
Once again THANK YOU!
-
1.
The force of gravity and the force of friction: Fg = .30*g = 2.94 N; Ff = .30*g*µ
Fnet = Fg - Ff. If µ = 0, forget about Ff......
2.
a) Correct! 1.80 kg
b) The force of gravity on the hanging mass; F = .60*g = 5.88 N
c) a = F/M = 5.88/1.80 = 3.267 m/s²
3.
a) a = dv/dt = (2.77 - 0)/(10 - 0) = 0.277 m/s² forward
b) Fnet = m*a = 1260*0.277 = 349 N forward
c) X = V²/2a = 2.77²/(2*.277) = +13.85 m
The force of gravity and the force of friction: Fg = .30*g = 2.94 N; Ff = .30*g*µ
Fnet = Fg - Ff. If µ = 0, forget about Ff......
2.
a) Correct! 1.80 kg
b) The force of gravity on the hanging mass; F = .60*g = 5.88 N
c) a = F/M = 5.88/1.80 = 3.267 m/s²
3.
a) a = dv/dt = (2.77 - 0)/(10 - 0) = 0.277 m/s² forward
b) Fnet = m*a = 1260*0.277 = 349 N forward
c) X = V²/2a = 2.77²/(2*.277) = +13.85 m