<span>A.frictional effects dissipate energy.</span>
Answer:
Option A. 180000 Kgm/s.
Explanation:
From the question given above, the following data were obtained:
For Train Car A:
Mass of train car A = 45000 Kg
Velocity of train car A = 4 m/s
Momentum of train car A =?
For Train Car B:
Mass of train car B = 45000 Kg
Velocity of train car B = 0 m/s
Momentum is simply defined as the product of mass and velocity. Mathematically, it can be expressed as:
Momentum = mass × velocity
With the above formula, the momentum of train car A before collision can be obtained as follow:
Mass of train car A = 45000 Kg
Velocity of train car A = 4 m/s
Momentum of train car A =?
Momentum = mass × velocity
Momentum = 45000 × 4
Momentum of train car A = 180000 Kgm/s
The reason why the snails are dead because the snails lack oxygen for it is a model of closed ecosystem. Another reason to this is that they lack abiotic factors that they need in surviving or as they live for the place that they are living lacks a lot and are not enough for them to last or survive. Lastly, the water could have not been a contributor for them to live for they may not be able to live in a water environment and could only dwell in land.
Answer:
The maximum voltage is 39.08 V.
Explanation:
Given that,
Voltage = 550 V
Suppose, In an L-R-C series circuit, the resistance is 400 ohms, the inductance is 0.380 Henry, and the capacitance is 
We need to calculate the resonant frequency
Using formula of resonant frequency
Put the value into the formula
We need to calculate the maximum current
Using formula of current
Put the value into the formula
We need to calculate the impedance of the circuit
Using formula of impedance
At resonant frequency , 
So, Z = R
We need to calculate the maximum voltage
Using formula of voltage
Put the value into the formula
Hence, The maximum voltage is 39.08 V.
