Every living thing would die
Answer:
0.62 m/s
Explanation:
Given that a model train, travelling at speed , approaching a buffer model train buffer spring
The train, of mass 2.5 kg, is stopped by compressing a spring in the buffer.
After the train has stopped, the energy stored in the spring is 0.48 J.
Calculate the initial speed v of the train
Solution
The total energy stored in the spring will be equal to the kinetic energy of the train.
That is,
1/2fe = 1/2mv^2
Substitutes the spring energy, and mass into the formula
0.48 = 1/2 × 2.5 × V^2
2.5V^2 = 0.96
V^2 = 0.96 / 2.5
V^2 = 0.384
V = sqrt ( 0.384 )
V = 0.62 m/s
Therefore, the initial velocity of the train is 0.62 metres per second.
A neutral metal sphere is touched by a negatively charged metal rod. ... If a negative object is used to charge a neutral object, then both objects become charged negatively. In order for the neutral sphere to become negative, it must gain electrons from the negatively charged rod.
Answer:
Drift velocity in m/s is 
.
Explanation:
<em>Formula for Drift Velocity is</em>:
Where I is the current
n is the number of electrons in 1 
or the electron density
A is the area of cross section and
q is the charge of one electron.
We are given the following:
n = 
I = 1 A
A = 0.40 
= 40 
We know that q = 
Putting all the values to find drift velocity:
So, <em>drift velocity in m/s</em> is .
