Answer
given,
L(t) = 10 - 3.5 t
mass of particle = 2 Kg
radius of the circle = 3.1 m
a) torque
τ = ![\dfrac{dL}{dt}](https://tex.z-dn.net/?f=%5Cdfrac%7BdL%7D%7Bdt%7D)
τ = ![\dfrac{d}{dt}(10 - 3.5 t)](https://tex.z-dn.net/?f=%5Cdfrac%7Bd%7D%7Bdt%7D%2810%20-%203.5%20t%29)
τ = -3.5 N.m
Particle rotates clockwise as i look down the plane. Hence, its angular velocity is downward.
L decreases the angular acceleration upward. so, net torque is upward.
b) Moment of inertia of the particle
I = m R^2
I = 2 x 3.1²
I = 19.22 kg.m²
L = I ω
ω = ![\dfrac{L}{I}](https://tex.z-dn.net/?f=%5Cdfrac%7BL%7D%7BI%7D)
ω = ![\dfrac{10 - 3.5 t}{19.22}](https://tex.z-dn.net/?f=%5Cdfrac%7B10%20-%203.5%20t%7D%7B19.22%7D)
ω = ![0.520 - 0.182 t](https://tex.z-dn.net/?f=0.520%20-%200.182%20t)
A = 0.52 rad/s B = -0.182 rad/s²
What you need to know is that the force is
F=ma
The force is the product of mass and acceleration
this means that the acceleration is
a=F/m
a) The force is halved?
this means that f will be
![\frac{F}{2}](https://tex.z-dn.net/?f=%20%5Cfrac%7BF%7D%7B2%7D%20)
now:
a=
![\frac{F}{2m}](https://tex.z-dn.net/?f=%20%5Cfrac%7BF%7D%7B2m%7D%20)
So the accelaration will also he halved (it's the original acceleratation divided by 2)
b) The object's mass is halved?
a=
![\frac{F}{m/2}](https://tex.z-dn.net/?f=%20%5Cfrac%7BF%7D%7Bm%2F2%7D%20)
=a=
![\frac{F2}{m}](https://tex.z-dn.net/?f=%20%5Cfrac%7BF2%7D%7Bm%7D%20)
which is the original acceleration times two!! so it will double
c) The force and the object's mass are both halved?
now we have
a=
![\frac{F/2}{m/2}](https://tex.z-dn.net/?f=%20%5Cfrac%7BF%2F2%7D%7Bm%2F2%7D%20)
=a=
![\frac{2F}{2m}](https://tex.z-dn.net/?f=%20%5Cfrac%7B2F%7D%7B2m%7D%20)
=a=
![\frac{F}{m}](https://tex.z-dn.net/?f=%20%5Cfrac%7BF%7D%7Bm%7D%20)
so they will cancel each other out and the acceleration will stay the same!
Streams carry sediment, like pebbles, in their flows. The pebbles can be in a variety of locations in the flow, depending on it's size, the balance between the upwards velocity on the pebble (drag and lift forces), and it's settling velocity.
I believe it is acceleration!
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