Answer: 1m/s
Explanation: according to the law of conservation of linear momentum in an isolated system, the momentum of the gun equals that of the bullet.
Mathematically
Mb×Vb = Mg×Vg
Where Mb = mass of bullet = 1/100 = 0.01 kg
Vb = velocity of bullet = 200 m/s
Mg = mass of gun = 2kg
Vg = recoil velocity of gun =?
0.01×200 = 2×Vg
Vg = 0.01×200/2
Vg = 0.01×100
Vg = 1m/s
Answer:
d) 1000 times
Explanation:
As we know that difference of sound level is given as
![L_2 - L_1 = 10 Log \frac{I_2}{I_1}](https://tex.z-dn.net/?f=L_2%20-%20L_1%20%3D%2010%20Log%20%5Cfrac%7BI_2%7D%7BI_1%7D)
so here we need to find the ratio of two intensity
it is given as
![Log\frac{I_2}{I_1} = \frac{(L_2- L_1)}{10}](https://tex.z-dn.net/?f=Log%5Cfrac%7BI_2%7D%7BI_1%7D%20%3D%20%5Cfrac%7B%28L_2-%20L_1%29%7D%7B10%7D)
![Log\frac{I_2}{I_1} = \frac{60 - 30}{10}](https://tex.z-dn.net/?f=Log%5Cfrac%7BI_2%7D%7BI_1%7D%20%3D%20%5Cfrac%7B60%20-%2030%7D%7B10%7D)
![Log\frac{I_2}{I_1} = 3](https://tex.z-dn.net/?f=Log%5Cfrac%7BI_2%7D%7BI_1%7D%20%3D%203)
now we have
![\frac{I_2}{I_1} = 10^3](https://tex.z-dn.net/?f=%5Cfrac%7BI_2%7D%7BI_1%7D%20%3D%2010%5E3)
so it is
d) 1000 times
Answer:
d = 0 [m]
Explanation:
Displacement is understood as the length and direction that a body travels to move from an initial point to an endpoint.
This displacement is represented with a vector or straight line that indicates the distance of the displacement and its length.
This displacement in an easier way to understand. It is the distance between the start point and the endpoint of the journey. Since the second point is equal to the first point, since Mary returns to the same place, there is no difference between the displacement.
Therefore the displacement is zero.