<span>Alicia
wanted to pull out a particular issue from a pile of magazines. First,
she tried pulling slowly, and the whole pile began to move. Then she
tried pulling quickly, and the issue she wanted came out without the
pile moving. The pile did not move because of the?
a. larger force Alicia applied
b. smooth surface of the magazines
c. inertia of the pile and friction <--- *** Answer ***
d. friction between the magazines
(If this is your question)
Hope this helps :p
</span>
Answer:
a) t = 9.16*10^{-18} s
b) y = 0.402 mm
Explanation:
(a) To find the time that the particle takes to pass trough the region between parallel plates, you take into account that the horizontal component of the velocity is constant in all trajectory of the particle. Then, you use the following formula:
x: length of the sides of the plates = 0.22m
v_x: horizontal component of the velocity = 2.4*10^6 m/s
(b) To find the vertical displacement of the particle you first calculate the acceleration of the particle generated by the electric force:
where you have used that the charge is 1.6*10^-19 C (charge of an electron).
With the values of the acceleration and time you use the following kinematic equation to calculate the vertical displacement:
first object gors highest
second object goes lowest.
The correct answer is C) towards the center of the circle.
Although the object is moving at a constant speed it is constantly accelerating due to the constant change in direction as it describes the circular path. This causes a constant change in velocity as velocity is a vector quantity.
For the object to maintain the circular path there has to be centripetal force acting on the object and this centripetal force is directed towards the center of the circle.