Answer:
The speed of the sound wave is 350 m
Explanation:
Given
Frequency of sound wave = 1000Hz = 1000
(since 1
= 1 Hertz (Hz))
Wavelength of sound wave = 35 cm
Speed of sound wave = ?
All waves have same the relation among frequency, sound and speed which is given by
v=fλ , where
v is the speed
f is frequency
λ is wavelength
Therefore, the speed of sound wave = 1000
x 35 cm
= 35000 cm
= 350 m
Hence the speed of the sound wave is 350 m
Hi! Let's see.
<h3><u>TOPIC: Kinetic Energy.</u></h3>
Explanation:
Data:
- Mass(m) = 2.1 kilograms
- Speed(v) = 30 m/s
- Kinetic Energy(Ek) = ?
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Use the kinetic energy formula:
Replace by the data:
We multiply speed squared:
Multiply in the numerator, without forgetting the units:
Both numerator and denominador operations are divided:
Answer: The kinetic energy is <u>945 Joules.</u>
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Answer:
r₂/r₁ = 1.82
Explanation:
The electric field due to a point charge, has the following expression:

For a distance r₁, the magnitude of the electric field is 395 N/C, so we can solve for r₁², as follows:
r₁² =
(1)
For a distance r2, the magnitude of the electric field is 119 N/C, so we can solve for r₂², as follows:
r₂² = 
We can find the quotient r₂/r₁, from (1) and (2):
r₂/r₁ =
= 1.82
Answer:
The specific kinetic energy of a mass is 0.8 kJ/kg
Explanation:
Given that,
Velocity = 40 m/s
Specific kinetic energy is the kinetic energy per unit mass.
We need to calculate the specific kinetic energy
Using formula of specific kinetic energy


Put the value into the formula


We know that,
1 kJ = 1000 J
or, 1J=0.001 KJ
The specific energy is


Hence, The specific kinetic energy of a mass is 0.8 kJ/kg