Answer:
A.) 27000 kgm/s
18000 kgm/s
B.) Va = 22 m/s
C.) 19800 kgm/s
25200 kgm/s
Explanation: Given that the velocity of A and B are 30 m/s and 20 m/s. And of the same mass M = 9 × 10^5g
M = 9×10^5/1000 = 900 kg
A.) Initial momentum of A
Mu = 900 × 30 = 27000 kgm/s
Initial momentum of B
Mu = 900 × 20 = 18000 kgm/s
B.) if they have an accident and then the velocity of the B is 28 m/s, find out velocity of A.
Momentum before impact = momentum after impact
Given that Vb = 28 m/s
27000 + 18000 = 900Va + 900 × 28
45000 = 900Va + 25200
900Va = 45000 - 25200
900Va = 19800
Va = 19800/900
Va = 22 m/s
C.) Momentum of A after impact
MV = 900 × 22 = 19800 kgm/s
Momentum of B after impact
MV = 900 × 28 = 25200 kgm/s
Answer:
i) O m/s² as velocity is constant
ii) 20m/s
iii)Hint:Calculate the area of the graph,that is;below the line, for the first 15 seconds only
Hope this helps.
Answer:
a. sinusoidal wave
Explanation:
As we know that the medium particle will move in SHM when disturbance travel through the medium
Here the wave propagation through many ways are possible through the medium
When medium particles performs SHM then in that case the wave equation is given as

so we have above equation of wave must be sinusoidal equations
so correct answer will be
a. sinusoidal wave
Answer:
1) Approximately
excess protons
2) negative
(
)
Explanation:
1)
Recall that the charge of an electron or proton is approximately: 
Therefore, to find the number of protons transferred in 7 micro-Coulombs of charge, we do:

Approximately
excess protons
2)
The sign and number of uncanceled elemental charges on plate A is therefore negative
, because the same number of positive charges were removed from it, changing its neutrality
Answer:
A
Explanation:
The principle of superposition which states that in undeformed rocks, the younger rocks will be on top of older rocks, is particularly important because it provided an order for assembling the relative ages of various rock layers.