Inquiry into Physics
8th Edition
ISBN: 9781337515863
Author: Ostdiek
Publisher: Cengage
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Chapter 7, Problem 7Q
To determine
If the size of the electrostatic force acting between two positively charged objects was exactly the same as the gravitational force acting between them, then what would happen. If they were moved closer together or farther apart?
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Check out a sample textbook solutionStudents have asked these similar questions
A particle with a charge of -3 x 10-8 C and 2x 10-5 J of kinetic energy enters the regionbetween two charged parallel plates as shownto the right. How far into the region will theparticle travel? If an electron were releasedfrom rest next to the negative plate, with whatspeed would it strike the positive plate?
In the following problems, you don't need to understand the physics to complete the questions.
Focus on the equations.
(a) The force of gravity, F, between two masses, m and M, separated by a distance r, is given by
where G is a constant. Write an equation of r in terms of other variables in the equation
GmM
F=
2
for F:
r=
(b) The electric force between two charges q=3·10¯6 units and Q=-4·10¯6 units separated by a
distance,
1
d = 3-10-4 units, is given by F=
where k=9. 10⁹ units.
Without using a calculator, calculate the F.
F=
kq
x²
(c) Two positive electric charges, q and Q are separated by a distance d. Assume that q> Q> 0. The
position x from charge q where the electric field zero is given by:
=
kQ
(d-x)²
kqQ
d²
Solve for x in terms of the other variables. The quantity k is a constant. Solution 1 represents the
largest value of x.
Hint: The solution can be simplified in many ways. The solutions accepted below have a form
d
Solution 1 =
a-b
Solution 2 =
d
a+b√√
You need to figure out…
The foot of your average gecko is covered with billions of tinyhair tips—called spatulae—that are made of keratin, the proteinfound in human hair. A subtle shift of the electron distribution inboth the spatulae and the wall to which a gecko clings producesan adhesive force by means of the van der Waals interaction between molecules. Suppose a gecko uses its spatulae to cling to a vertical windowpane. If you were to describe this situation in terms ofa coefficient of static friction, ms, what value would you assign toms? Is this a sensible way to model the gecko’s feat? Explain.
Chapter 7 Solutions
Inquiry into Physics
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