Question 9
1 answer:
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Answer:
Position A/Position E
,
Position B/Position D
,
, for
Position C
,
Explanation:
Let suppose that ball-Earth system represents a conservative system. By Principle of Energy Conservation, total energy () is the sum of gravitational potential energy (
) and translational kinetic energy (
), all measured in joules. In addition, gravitational potential energy is directly proportional to height (
) and translational kinetic energy is directly proportional to the square of velocity.
Besides, gravitational potential energy is increased at the expense of translational kinetric energy. Then, relative amounts at each position are described below:
Position A/Position E
,
Position B/Position D
,
, for
Position C
,
Answer:
Explanation:
in the electric field electron will face a force which will create an acceleration
( here - ve ) as follows
Force on electron
= charge on electron x electric field = Q X E
acceleration= Force / mass = Q E / m
mass of electron = 9.1 x 10⁻³¹
acceleration a =
= 17.4 x 10¹⁴ ms⁻² .
Now initial velocity u = 5 x 10⁶ m/s
Final velocity v = 0
acceleration a = 17.4 x 10¹⁴ ms⁻²
distance of travel = s
v² = u² - 2as
0 = (5 x 10⁶)² - 2 x 17.4 x 10¹⁴ s
s = 7.18 mm
2 ) v = u - at
0 = 5 x 10⁶ - 17.4 x 10¹⁴ t
t = .287 x 10⁻⁸ s
Total time elapsed = 2 x .287 x 10⁻⁸
= .57 x 10⁻⁸ s .