You throw a baseball at a 45° angle to the horizontal, aiming at a friend who’s sitting in a tree a distance h above level ground. At the instant you throw your ball, your friend drops another ball, (a) Show that the two balls will collide, no matter what your ball’s initial speed, provided it’s greater than some minimum value. (b) Find an expression for that minimum speed.
You throw a baseball at a 45° angle to the horizontal, aiming at a friend who’s sitting in a tree a distance h above level ground. At the instant you throw your ball, your friend drops another ball, (a) Show that the two balls will collide, no matter what your ball’s initial speed, provided it’s greater than some minimum value. (b) Find an expression for that minimum speed.
You throw a baseball at a 45° angle to the horizontal, aiming at a friend who’s sitting in a tree a distance h above level ground. At the instant you throw your ball, your friend drops another ball, (a) Show that the two balls will collide, no matter what your ball’s initial speed, provided it’s greater than some minimum value. (b) Find an expression for that minimum speed.
1. A charge of -25 μC is distributed uniformly throughout a spherical volume of radius 11.5 cm.
Determine the electric field due to this charge at a distance of (a) 2 cm, (b) 4.6 cm, and (c) 25 cm from
the center of the sphere.
(a) =
=
(b) E =
(c)Ẻ =
=
NC NC NC
1.
A long silver rod of radius 3.5 cm has a charge of -3.9
ис
on its surface. Here ŕ is a unit vector
ст
directed perpendicularly away from the axis of the rod as shown in the figure.
(a) Find the electric field at a point 5 cm from the center of the rod (an outside point).
E =
N
C
(b) Find the electric field at a point 1.8 cm from the center of the rod (an inside point)
E=0
Think & Prepare
N
C
1. Is there a symmetry in the charge distribution? What kind of symmetry?
2. The problem gives the charge per unit length 1. How do you figure out the surface charge density σ
from a?
1. Determine the electric flux through each surface whose cross-section is shown below.
55
S₂
-29
S5
SA
S3
+ 9
Enter your answer in terms of q and ε
Φ
(a) s₁
(b) s₂
=
-29
(C) Φ
զ
Ερ
(d) SA
=
(e) $5
(f) Sa
$6
=
II
✓
-29
S6
+39
Chapter 3 Solutions
Essential University Physics: Volume 1; Mastering Physics with Pearson eText -- ValuePack Access Card -- for Essential University Physics (3rd Edition)
Chemistry: An Introduction to General, Organic, and Biological Chemistry (13th Edition)
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