[T] The following problems consider the scalar form of Coulomb’s law, which describes the electrostatic force between two point charges, such as elections. It is given by the equation F ( r ) = k e | q 1 q 2 | r 2 where k e is Coulomb's constant, q i are the magnitudes of the charges of the two particles, and r is the distance between the two particles. 168. To simplify the calculation of a model with many interacting particles, after some threshold value r = R, we approximate F as zero. Explain the physical reasoning behind this assumption. What is the force equation? Evaluate the force F using both Coulomb’s law and our approximation, assuming two protons with a charge magnitude of 1.6022 × 10 − 19 coulombs (C), and the Coulomb constant k e = 8.988 × 10 9 N m 2 / C 2 are 1 m apart. Also, assume R < 1 m. How much inaccuracy does our approximation generate? Is our approximation reasonable? Is there any finite value of R for which this system remains continuous at R?
[T] The following problems consider the scalar form of Coulomb’s law, which describes the electrostatic force between two point charges, such as elections. It is given by the equation F ( r ) = k e | q 1 q 2 | r 2 where k e is Coulomb's constant, q i are the magnitudes of the charges of the two particles, and r is the distance between the two particles. 168. To simplify the calculation of a model with many interacting particles, after some threshold value r = R, we approximate F as zero. Explain the physical reasoning behind this assumption. What is the force equation? Evaluate the force F using both Coulomb’s law and our approximation, assuming two protons with a charge magnitude of 1.6022 × 10 − 19 coulombs (C), and the Coulomb constant k e = 8.988 × 10 9 N m 2 / C 2 are 1 m apart. Also, assume R < 1 m. How much inaccuracy does our approximation generate? Is our approximation reasonable? Is there any finite value of R for which this system remains continuous at R?
[T] The following problems consider the scalar form of Coulomb’s law, which describes the electrostatic force between two point charges, such as elections. It is given by the equation
F
(
r
)
=
k
e
|
q
1
q
2
|
r
2
where keis Coulomb's constant,
q
i
are the magnitudes of the charges of the two particles, and r is the distance between the two particles. 168. To simplify the calculation of a model with many interacting particles, after some threshold value r = R, we approximate F as zero.
Explain the physical reasoning behind this assumption.
What is the force equation?
Evaluate the force F using both Coulomb’s law and our approximation, assuming two protons with a charge magnitude of
1.6022
×
10
−
19
coulombs (C), and the Coulomb constant
k
e
=
8.988
×
10
9
N
m
2
/
C
2
are 1 m apart. Also, assume R < 1 m. How much inaccuracy does our approximation generate? Is our approximation reasonable?
Is there any finite value of R for which this system remains continuous at R?
A hollow steel ball weighing 4 pounds is suspended from a spring. This stretches the spring feet. The ball is started in motion from the equilibrium position with a downward velocity of 4 feet per second. The air resistance (in pounds) of the moving ball numerically equals 4 times its velocity (in
feet per second)
Suppose that after t seconds the ball is y feet below its rest position. Find y in terms of t. (Note that the positive direction is down.)
Take as the gravitational acceleration 32 feet per second per second.
y =
A hollow steel ball weighing 4 pounds is suspended from a spring. This stretches the spring feet. The ball is started in motion from
the equilibrium position with a downward velocity of 8 feet per second. The air resistance (in pounds) of the moving ball numerically
equals 4 times its velocity (in feet per second)
Suppose that aftert seconds the ball is y feet below its rest position. Find y in terms of t. (Note that the positive direction is down.)
Take as the gravitational acceleration 32 feet per second per second.
y =
(2) Solve the following as systematically as possible. Show your complete solutions.
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