Problem 2.4.1 Central Force Two objects with masses m1 and...

Problem 2.4.1 Central Force Two objects with masses $m_1$ and $m_2$ and charges $q_1$ and $q_2$ are located at positions $r_1$ and $r_2$. a) Write an expression for the electrostatic force of object #1 on object #2. b) Write an expression for the electrostatic force of object #2 on object #1. c) Write an expression for the gravitational force of object #1 on object #2.

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Transcript

00:01 Force, not energy, and gravitational attraction.

00:05 Gravitational force.

00:07 We're given the following information.

00:10 The electrostatic force of attraction between two oppositely charged objects is given by this equation.

00:33 Where cues are the charges of two objects in coulums, and d is the distance separating the two objects and meters.

00:59 Our other value is our proportionality.

01:03 Our constant, not a proportionality constant, but our constant which is 8 .99 times 10 to the 9th newton meters squared per kilogram squared and that was given.

01:23 And our separation is 0 .23 nanometers.

01:30 This has to be in meters.

01:33 So 0 .23 nanometers is equal to 0 .23 times 10 to the 9th meters.

01:43 We can substitute into our equation.

02:06 And our charges are, let me grab my book here.

02:26 These are the charges of our two particles, our proton or neutron.

02:44 In solving for force and reporting to two decimal places, or two significant figures, i got 4 .4 times 10 to the minus 9th newton's.

02:57 That was my answer for part a.

03:03 For part b, we're going to be working for force of gravity.

03:07 A new page...

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