An electron of mass 9.11×10-31kg leaves one end of a tv picture tube with zero initial speed and travels in a straight line to the accelerating grid, which is a distance 1.30cm away. it reaches the grid with a speed of 2.50×106m/s . the accelerating force is constant.
a)find the acceleration.
b)find the time to reach the grid.
c)find the net force. (you can ignore the gravitational force on the electron).

(A) Acceleration will be

(b) Time taken will be

(c) Force will be              

Explanation:

We have given that electron starts from rest so initial velocity u = 0 m/sec

Final velocity

Mass of electron

Distance traveled by electron

From third equation of motion we know that

(a) So

(b) From first equation of motion we know that v = u+at

So

(c) From newton's law we know that force

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is