A ball is thrown straight up with enough speed so that it is in the air for several seconds. (a) What is the velocity of the ball when it reaches its highest point? (b) What is its velocity 1 s before it reaches its highest point? (c) What is the charge in its velocity, Δ v , during this 1-s interval? (d) What is its velocity 1 s after it reaches its highest point? (e) What is the change in its velocity, Δ v , during this 1-s interval? (f) What is the change in its velocity, Δ v , during the 2-s interval from 1 s before it reaches the highest point to 1 s after it reaches the highest point? ( Caution : We are talking about velocity, not speed.) (g) What is the acceleration of the ball during any of these time intervals and at the moment the ball has zero velocity?
A ball is thrown straight up with enough speed so that it is in the air for several seconds. (a) What is the velocity of the ball when it reaches its highest point? (b) What is its velocity 1 s before it reaches its highest point? (c) What is the charge in its velocity, Δ v , during this 1-s interval? (d) What is its velocity 1 s after it reaches its highest point? (e) What is the change in its velocity, Δ v , during this 1-s interval? (f) What is the change in its velocity, Δ v , during the 2-s interval from 1 s before it reaches the highest point to 1 s after it reaches the highest point? ( Caution : We are talking about velocity, not speed.) (g) What is the acceleration of the ball during any of these time intervals and at the moment the ball has zero velocity?
A ball is thrown straight up with enough speed so that it is in the air for several seconds.
(a) What is the velocity of the ball when it reaches its highest point?
(b) What is its velocity 1 s before it reaches its highest point?
(c) What is the charge in its velocity, Δv, during this 1-s interval?
(d) What is its velocity 1 s after it reaches its highest point?
(e) What is the change in its velocity, Δv, during this 1-s interval?
(f) What is the change in its velocity, Δv, during the 2-s interval from 1 s before it reaches the highest point to 1 s after it reaches the highest point? (Caution: We are talking about velocity, not speed.)
(g) What is the acceleration of the ball during any of these time intervals and at the moment the ball has zero velocity?
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
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