Answer: 1. A Unbalanced force and net force
Explanation:
The combination of all forces acting on a object is called a Net Force, and a Unbalanced force can cause an object to stop, start moving or change direction.
Complete Question
The complete question is shown on the first uploaded image
Answer:
a
![p = 14033.7 \ kg\cdot m/s](https://tex.z-dn.net/?f=p%20%3D%2014033.7%20%5C%20kg%5Ccdot%20m%2Fs)
b
![v = 1.22 \ m/s](https://tex.z-dn.net/?f=v%20%3D%201.22%20%5C%20%20m%2Fs)
c
Explanation:
From the question we are told that
The mass of the coal car is ![m_1 = 4527 \ kg](https://tex.z-dn.net/?f=m_1%20%20%3D%20%204527%20%5C%20kg)
The velocity is ![v_i = 3.1 \ m/s](https://tex.z-dn.net/?f=v_i%20%3D%20%203.1%20%5C%20m%2Fs)
The load of coal dropped is ![m_2 = 6952 \ kg](https://tex.z-dn.net/?f=m_2%20%3D%206952%20%5C%20%20kg)
Generally the momentum of the system before the coal is added is mathematically represented as
![p = m_j * v_i](https://tex.z-dn.net/?f=p%20%3D%20m_j%20%2A%20v_i)
=> ![p = 4527 * 3.1](https://tex.z-dn.net/?f=p%20%3D%204527%20%2A%203.1)
=> ![p = 14033.7 \ kg\cdot m/s](https://tex.z-dn.net/?f=p%20%3D%2014033.7%20%5C%20kg%5Ccdot%20m%2Fs)
Generally from the law of momentum conservation is mathematically represented as
![m_1 * v_i + m_2 * v_2 = (m_1 + m_2 )v](https://tex.z-dn.net/?f=m_1%20%2A%20v_i%20%2B%20m_2%20%2A%20v_2%20%3D%20%28m_1%20%2B%20m_2%20%20%29v)
Here
is the velocity of the load before it is dropped and the value is 0 m/s
So
=> ![v =\frac{m_1 * v_i }{m_1 + m_2}](https://tex.z-dn.net/?f=v%20%3D%5Cfrac%7Bm_1%20%2A%20%20v_i%20%7D%7Bm_1%20%2B%20m_2%7D)
=> ![v = 1.22 \ m/s](https://tex.z-dn.net/?f=v%20%3D%201.22%20%5C%20%20m%2Fs)
When v = 1m/s and
remain the same
Then
=> ![1 =\frac{4527 * 3.1 }{4527 + m_2}](https://tex.z-dn.net/?f=1%20%3D%5Cfrac%7B4527%20%2A%20%203.1%20%7D%7B4527%20%20%2B%20m_2%7D)
=> ![4527 + m_2 = 14033.7](https://tex.z-dn.net/?f=4527%20%2B%20m_2%20%3D%20%2014033.7)
=>
<span>The multiple reflection of a single sound wave is echo</span>
I would say A depending on its end location because it you are walking at a constant velocity and conclude the walk exactly where you began, you have used energy, but no work has been done.
Not C because the object begins at ground level and is then lifted above 3 feet, which has a displacement of 3 feet in the y-direction (vertical) but no distance has been traveled.
Resistance typically opposes flow of current.
When the Resistance is increased, the current would be reduced, but when the Resistance is reduced, the current would be increased in the circuit.