Answer: option D. 4
Reasoning:
Assuming that the time elapsed between any two consecutive dots is the same, and that the second dot marks second 1, the column with 3 dots marks second 2, and the dot right most marks second 3, the motorcycle has positive acceleration after 4 seconds.
That is because:
1) from the first dot to the second dot: the velocity the lenght of the arrow that models the velocity decrases, which means that the acceleration is negative.
2) In the nex group of dots the length of the arrow remains equal, which means that the velocity is constant and the acceleration is 0.
3) For the last dot, the length of the arrow is greater, which means that the velocity increases, and so the acceleration is positive.
The electrostatic force between the two charges is
Explanation:
The electrostatic force between two charges is given by Coulomb's law:
where:
is the Coulomb's constant
are the two charges
r is the separation between the two charges
In this problem, we have the following data:
is the magnitude of the two charges, where
is the fundamental charge
is the separation between the two charges
Substutiting into the equation, we find the force:
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Answer
given,
radius of merry - go - round = 4 m
mass of the disk = 120 kg
speed of the merry- go-round = 0 rad/s
speed = 2 m/s
mass of student = 60 kg
initial angular momentum of the system
final angular momentum of the system
from conservation of angular momentum
now,
change in kinetic energy of the system
initially the merry-go-round was on rest KE_i = 0
Answer:
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Explanation: