An enemy spaceship is moving toward your starfighter with a speed, as measured in your frame, of 0.400 c . The enemy ship fires a missile toward you at a speed of 0.700 c relative to the enemy ship ( Fig. E37.18 ). (a) What is the speed of the missile Figure E37.18 relative to you? Express your answer in terms of the speed of light , (h) If you measure that the enemy ship is 8.00 × 10 6 km away from you when the missile is fired, how much time, measured in your frame, will it take the missile to reach you?
An enemy spaceship is moving toward your starfighter with a speed, as measured in your frame, of 0.400 c . The enemy ship fires a missile toward you at a speed of 0.700 c relative to the enemy ship ( Fig. E37.18 ). (a) What is the speed of the missile Figure E37.18 relative to you? Express your answer in terms of the speed of light , (h) If you measure that the enemy ship is 8.00 × 10 6 km away from you when the missile is fired, how much time, measured in your frame, will it take the missile to reach you?
An enemy spaceship is moving toward your starfighter with a speed, as measured in your frame, of 0.400c. The enemy ship fires a missile toward you at a speed of 0.700c relative to the enemy ship (Fig. E37.18). (a) What is the speed of the missile
Figure E37.18
relative to you? Express your answer in terms of the speed of light, (h) If you measure that the enemy ship is 8.00 × 106km away from you when the missile is fired, how much time, measured in your frame, will it take the missile to reach you?
Definition Definition Rate at which light travels, measured in a vacuum. The speed of light is a universal physical constant used in many areas of physics, most commonly denoted by the letter c . The value of the speed of light c = 299,792,458 m/s, but for most of the calculations, the value of the speed of light is approximated as c = 3 x 10 8 m/s.
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
Campbell Essential Biology with Physiology (5th Edition)
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