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expeople1 [14]
3 years ago
10

A physics department has a Foucault pendulum, a long-period pendulum suspended from the ceiling. The pendulum has an electric ci

rcuit that keeps it oscillating with a constant amplitude. When the circuit is turned off, the oscillation amplitude decreases by 50% in 37 minutes.
a. What is the pendulum's time constant?



b. How much additional time elapses before the amplitude decreases to 25% of its initial value?
Physics
1 answer:
antoniya [11.8K]3 years ago
8 0

Answer:

t=37 mins -> 2220sec

We want "T" which is the pendulum time constant

Using this equation

.5A=Ae^(-t/T)

The .5A is half the amplitude

Take ln of both sides to get ride of Ae

=ln(.5)=-2220/T

Now rearrange to = T

T=-2220/ln(.5) = 3202.78sec / 60 secs = 53.38 mins -> first part of the answer.

The second part is really easy. It took 37 mins to decay half way. meaning to decay another half of 50% which equals 25% it will take an additional 37 mins!

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Light propagating in the glass n1= 1.65 wall of an aquarium tank strikes the interior edge of the wall with incidence angle 19.0
jonny [76]
We can solve this using Snell's Law which is represented by the equation:
sin θ₁ / sin θ₂ = n₂ / n₁

From the problem, we can substitute values and solve for the angle of refraction.
sin 19 / sin θ₂ = 1.65 / 1
θ₂ = 11.38°

The angle of refraction would be 11.38°.
3 0
3 years ago
The city is thinking about starting a program to add a new chemical to the public pool. Before they do, they want to find out if
Kitty [74]
The best and most correct answer among the choices provided by the question is the fourth choice.


The best people for advising is <span>the government agency that regulates these types of chemicals.</span>
I hope my answer has come to your help. God bless and have a nice day ahead!
4 0
3 years ago
MULTIPLE CHOICE QUESTION
Nookie1986 [14]

Which object? More information is needed to answer this question

4 0
3 years ago
Given a wire with a cross section of .45cm^2, a length of 3cm, and an internal resistance of 3 ohms, show your 5 steps to solve
Gre4nikov [31]
Resistance ∞ (proportional) length 
resistance ∞ 1/ area

therefore, 
(the constant that we take is known as the resistivity)

resistance =  (resistivity*length )/ area
 resistivity = (resistance * area ) / length
                  = (3 * 45) / 3 =    135/3 = 45 Ωm

in short your answer is 45 Ωm
4 0
3 years ago
A bomb is dropped from a bomber traveling at the speed of 120 km / h, destroying a military objective located at a distance of 2
schepotkina [342]

Answer:

18 km

Explanation:

Convert km/h to m/s:

120 km/h × (1000 m/km) × (1 h / 3600 s) = 33.3 m/s

The time it takes the bomb to travel the 2000 meters is:

2000 m / (33.3 m/s) = 60 s

So it takes 60 seconds for the bomb to fall.  The distance it fell is therefore:

Δy = v₀ᵧ t + ½ aᵧ t²

Δy = (0 m/s) (60 s) + ½ (10 m/s²) (60 s)²

Δy = 18,000 m

Δy = 18 km

7 0
3 years ago
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