All categories

3 years ago

25. How long does it take a child on a swing to complete one swing if her center of gravity is 4.00 m below the pivot?

Physics

1 answer:

Lina20 [59]3 years ago

4 0

Length=l=4m

$\\ \rm\rightarrowtail T=2\pi\sqrt{\dfrac{l}{g}}$

$\\ \rm\rightarrowtail T=2\pi\sqrt{\dfrac{4}{9.8}}$

$\\ \rm\rightarrowtail T=2\pi(0.63887)$

$\\ \rm\rightarrowtail T=1.27774\pi$

$\\ \rm\rightarrowtail T=4.012s$

You might be interested in

What is de Broglie's hypothesis ? Make sure to be specific (qualitative and quantitative)

victus00 [196]

Answer and Explanation:

DE BROGLIE 'S HYPOTHESIS :

According to De broglie the matter have dual nature it can behave as particle as well as wave
According to this hypothesis all matter have wave like property and having wavelength.
The de broglie wavelength is given by $\lambda =\frac{h}{P}$ here h is plank's constant and P is momentum
This hypothesis determines the probability of finding the object at a give point

3 0

3 years ago

What is happens when a beam of light is traveling through air and is reflected by a glass surface?

DaniilM [7]

When a beam of light is traveling through air and is reflected by a glass surface, then the 2R / (1+R) is the total reflectance through a glass window.

To find the answer, we have to know about reflection.

<h3>What is reflection by glass surface?</h3>

Depending on the angle of incidence, the refractive indices of the glass and the light's source, some light is reflected when it strikes a glass surface (e.g., air).
The Fresnel equations can be used to calculate the percentage of transmitted and reflected light.
Both the front and the rear of glass reflect the light that is traveling through it. In fact, the light may mirror itself several times. Therefore, 2R / (1+R) is the total reflectance through a glass window.
These equations predict that ordinary soda-lime window glass will reflect around 8% of the light, assuming a perpendicular incidence angle and no absorption or scattering.

Thus, we can conclude that, when a beam of light is traveling through air and is reflected by a glass surface, then the 2R / (1+R) is the total reflectance through a glass window.

Learn more about the reflection here:

brainly.com/question/5012638

#SPJ4

7 0

2 years ago

The siren on an ambulance is emitting a sound whose frequency is 2450 Hz. The speed of sound is 343 m/s. If the ambulance is sta

lyudmila [28]

Answer:

The wavelength is 0.14 m

Explanation:

Given that,

Frequency = 2450 Hz

Speed of sound = 343 m/s

We need to calculate the wavelength

Using formula of wavelength

$v= f\lambda$

Where, v = speed of sound

f = frequency

Put the value into the formula

$\lambda=\dfrac{v}{f}$

$\lambda=\dfrac{343}{2450}$

$\lambda=0.14\ m$

Hence, The wavelength is 0.14 m

5 0

4 years ago

Read 2 more answers

the two forces acting on a falling object are gravity and?....1.force, 2. friction, 3. air resistance, and 4. net force?

Vsevolod [243]

In free fall, the only force acting on an object is gravity. The force of gravity is an unbalanced force, which causes an object to accelerate. In the absence of air, two objects with different masses fall at exactly the same rate of acceleration.

6 0

3 years ago

The magnitude R, measured on the Richter scale, of an earthquake of intensity I is defined as Requalslog StartFraction Upper I

lapo4ka [179]

Answer:

R = 6.8

Explanation:

Given data:

Richter scale $R = log(\frac{I}{I_o})$