What are the large, dark basaltic plains on the moon called?
2 answers:
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Answer:
a) I = 1,894 10¹⁰ W / m², b) E = 1.376 10⁵ N / C
Explanation:
a) intensity is defined as energy per unit area per unit time
I = P / A
let's reduce the magnitudes to the SI system
P = 10 mW = 10 10⁻³ W
d = 0.82 μm = 0.82 10⁻⁶ m
the laser area is
A =π r² = π d²/4
A =π (0.82 10⁻⁶)²/4
A = 5.28 10⁻¹³ m²
we calculate
I =
I = 1,894 10¹⁰ W / m²
b) average intensity and electric field are related
I = E * E
E = √I
E =
E = 1.376 10⁵ N / C
Answer:
The speed of the sled is 9.2 m/s
The speed of the boulder is 0.82 m/s
Solution:
As per the question:
Mass of the boulder,
Mass of the sled,
Mass of the boy,
Initial Velocity, v = 10.0 m/s
Now,
To calculate the speed of both the sled and the boulder after the occurrence of the collision:
m =
Initial velocity of the boulder,
Since, the collision is elastic, both the energy and momentum rem,ain conserved.
Now,
Using the conservation of momentum:
where
v' = final velocity of the the system of boy and sled
= final velocity of the boulder
(1)
Now,
Using conservation of energy:
(2)
Now, from eqn (1) and (2):
Now,