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exercise 4.6:

Constants of a TV picture tube with zero initial speed and travels in a straight line to the accelerating grid grid witha speedof410-10m/s. The accelerating force is constant

Part A Find the acceleration. ΑΣ m/s Submit Request Answer Part B Find the time to reach the grid t :

▼ Part C Find the net force. (You can ignore the gravitational force on the electron)

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Answer #1

a) The electron is moving in a straight line under the action of a constant force so to calculate the acceleration we can use the following equation of motion

1,2 = u2+2as (1)

s is the distance traversed, u and v represent the initial and final speeds, respectively. Solving for a

(4 × 106 )2-02 + 2a × 2.5 × 10-2

(4 × 106 )2 3

(b) The time elapsed t to reach the grid can be calculated as follows

u + at (2) u

Putting u=0 and solving for t

t=rac{v}{a}=rac{4 imes 10^6}{3.2 imes 10^{14}}=1.25 imes 10^{-8}s

(c) The net force F can be given as

F ma....(3)

Here, m is the mass of the electron.

31 14 16 F 9.11 × 10- × 3.2 × 10-292 × 10-N

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