A pendulum is observed to complete 20 full cycles in 60 seconds. Determine the period and the frequency of the pendulum.
2 answers:
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Answer:
0.002833 sec
Explanation:
Speed of light in vacuum is
Given distance = 850 km = 850×1000=850000 m
We have to calculate the time that light take to travel the distance 850 km
Time
So the time taken by light to travel 850 km is 0.002833 sec
Solution:
Ms = 1.99 × 1030 kg− mass of Sun;
Me = 5.98 × 1024kg− mass of Earth;
Mm = 7.35 × 1022kg − mass of Moon;
rSM = 1.50 × 1011m − distance to the Moon from the Sun;
rEM = 3.85 × 108m − distance to the Moon from the Earth;
The gravitational force that acts on the Moon by the Earth (Law of Gravity):
The gravitational force that acts on the Moon by the Sun (Law of Gravity):
Net gravitational force on the moon:
Pythagorean theorem for a right triangle ABC:
Answer: Answer: magnitude of the net gravitational force on the moon is
4.77 × N.
Answer:
the thickness of the soap film is 127.82 nm or 130 nm
Explanation:
Given the data in the question;
n = 1.33
λ = 680 nm = 680 × 10⁻⁹ m
m = 1 and β = 0
When we see the red fringe, its a point of maximum reflection
hence, for interference with a thin soap film, we say;
2 × n × d × cos( β ) = ( m - 0.5) × λ
so we substitute in our given values;
2 × 1.33 × d × cos( 0 ) = ( 1 - 0.5) × ( 680 × 10⁻⁹ )
2.66 × cos( 0 ) × d = 0.5 × ( 680 × 10⁻⁹ )
2.66 × 1 × d = 3.4 × 10⁻⁷
d = ( 3.4 × 10⁻⁷ ) / 2.66
d = 127.82 × 10⁻⁹ m
d = 127.82 nm ≈ 130 nm
Therefore, the thickness of the soap film is 127.82 nm or 130 nm