Answer:
The value is 
Explanation:
From the question we are told that
The height of the top meter stick above the ground is 
The time taken for the acorn to pass the length of the stick is 
Generally the height of the acorn at the point it is the same height with the metered stick is mathematically represented as
Here 
is height of the meter stick and the value is 1 m (This because we are told in the question that the stick is 1 meter in length ( a meter stick))
So
=> 
Generally the velocity of the acorn just before passing the top of the meter stick is mathematically represented by a kinematic equation as
here u is zero since the acorn started from rest
So
Generally the height of the acorn is
\
Answer: the answer is B the lower the resistance,the higher the conductivity
Explanation:
Resistance is inversely proportional to conductivity,the lower the resistance the higher the conductivity,the metal silver has a very low resistance,thus it conductivity is high
Answer:
The value is 
Explanation:
From the question we are told that
The power rating of the bulb is 
The frequency is 
The percentage of the input power that is emitted as visible light is 
Generally the amount of power emitted as visible light is mathematically represented as
=> 
=> 
Generally the amount of energy emitted as light is mathematically represented as
Here n is the number of photon , h is the Planks constant with value 
Generally this power emitted as visible light is mathematically represented as
=> 
=> 
=> 
=>
a decrease in the frequency of the sound wave.
Explanation:
When a sound source is moving away from an observer, the observer will hear a lower pitch due to a decrease in the frequency of the sound wave. This is known as the Doppler's effect.
- As the sound source moves closer to the observer, they hear a higher pitch in the reverse process.
- A sound wave transmits vibrational energy from the source to the hearer.
- A sound wave has frequency, amplitude, velocity and wavelength just like other wave types.
- The frequency of a wave is the number of waves that passes through a point at a time.
- This is related to the the wavelength of a wave.
- Waves of a high frequency are known to have short wavelengths and vice versa.
- To hear a low pitch, the source moves away and the wavelength between successive crests and troughs on a wave increases considerably.
Learn more:
Sound waves brainly.com/question/2845448
#learnwithBrainly
Answer:
ω, the angular frequency of the source equals 377 rad/s
Explanation:
From the question, V(t) = V cosωt.
Now, ω = the angular frequency of the sinusoidal wave is given by
ω = 2πf where f = the frequency of the source = 60 Hz
So, the angular frequency of the source ,ω = 2π × the frequency of the source.
So, ω = 2πf
ω = 2π × 60 Hz
ω = 120π rad/s
ω = 376.99 rad/s
ω ≅ 377 rad/s
So, ω, the angular frequency of the source equals 377 rad/s
