Suppose N electrons can be placed in either of two configurations. In configuration 1, they are all placed on the circumference of a narrow ring of radius R and are uniformly distributed so that the distance between adjacent electrons is the same everywhere In configuration 2, N − 1 electrons are uniformly distributed on the ring and one electron is placed in the center of the ring, (a) What is the smallest value of N for which the second configuration is less energetic than the first? (b) For that value of N , consider any one circumference electron—call it e 0 . How many other circumference electrons are closer to e 0 than the central electron is?
Suppose N electrons can be placed in either of two configurations. In configuration 1, they are all placed on the circumference of a narrow ring of radius R and are uniformly distributed so that the distance between adjacent electrons is the same everywhere In configuration 2, N − 1 electrons are uniformly distributed on the ring and one electron is placed in the center of the ring, (a) What is the smallest value of N for which the second configuration is less energetic than the first? (b) For that value of N , consider any one circumference electron—call it e 0 . How many other circumference electrons are closer to e 0 than the central electron is?
Suppose N electrons can be placed in either of two configurations. In configuration 1, they are all placed on the circumference of a narrow ring of radius R and are uniformly distributed so that the distance between adjacent electrons is the same everywhere In configuration 2, N − 1 electrons are uniformly distributed on the ring and one electron is placed in the center of the ring, (a) What is the smallest value of N for which the second configuration is less energetic than the first? (b) For that value of N, consider any one circumference electron—call it e0. How many other circumference electrons are closer to e0 than the central electron is?
Which of the following best describes how to calculate the average acceleration of
any object?
Average acceleration is always halfway between the initial acceleration of an
object and its final acceleration.
Average acceleration is always equal to the change in velocity of an object
divided by the time interval.
Average acceleration is always equal to the displacement of an object divided by
the time interval.
Average acceleration is always equal to the change in speed of an object divided
by the time interval.
The figure shows the velocity versus time graph for a car driving on a straight road.
Which of the following best describes the acceleration of the car?
v (m/s)
t(s)
The acceleration of the car is negative and decreasing.
The acceleration of the car is constant.
The acceleration of the car is positive and increasing.
The acceleration of the car is positive and decreasing.
The acceleration of the car is negative and increasing.
Which figure could represent the velocity versus time graph of a motorcycle
whose speed is increasing?
v (m/s)
v (m/s)
t(s)
t(s)
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