Answer:
Frequency – The frequency of a wave is the number of waves that pass a given point in a certain amount of time. Frequency is measured in units called hertz (Hz), and is defined as the number of waves per second. A wave that occurs every second has a frequency of 1 wave per second (1/s) or 1 Hz.
Answer:
1.
2.
Explanation:
Given that
f₁= 20 Hz
f₂= 20 KHz
C= 305 m/s
For open pie organ :
<u>Shortest length :</u><u>
</u>
<u>Longest length :
</u>
Answer:
18.25 units
Explanation:
We are given that
The position of object A=
The position of object B=
We have to find the distance between object A and object at time t=3.00 s
Substitute t=3 s
The distance between A and B
The magnitude of distance between A and B
Using the formula magnitude of position vector
r=xi+yj+zk
Answer:
h = 12.95 m
, The correct answer is D
Explanation:
For this exercise we use the definition of density
ρ= m V
For the water
= m /
For ice
= m /
The tabulated water density is = 997 Kg / m³ average between temperatures, the density near the freezing point that is 1000 kg/m³ can also be used, let's use the latter; The density of ice is 916.8 kg / m³
The mass of the water that is frozen is equal to the mass of ice that is formed, therefore, we can clear the doughs in the two equals formulas
Water
m =
Ice
m =
Vw =
Vw = /
Reduce to SI system
= 5.1 107 km³ (10³m / 1 km)³ = 5.1 10¹⁶ m³
Let's calculate
= 916.8 / 1000 5.1 10¹⁶
= 4,676 10¹⁶ m³
It indicates the surface of the ocean, so it is volume
V = A h
Where A is the surface and h is the height
A = 3.61 109 km² (10³ m / 1km)² = 3.61 10¹⁵ m²
h = V / A
h = 4.676 10¹⁶ / 3.61 10¹⁵
h = 12.95 m
The correct answer is D
Mechanical energy is the sum of kinetic energy and potential energy, or E=Ek+Ep. So Ek=(1/2)*m*v² where m is the mass of the object and v is it's velocity. Mp=m*g*h where m is the mass, g=9.81 m/s² and h is the height of the object. So after we input the numbers the total mechanical energy is
E=(1/2)*2.5*(4.5²) + 2.5*9.81*18 = 25.3125 J + 441.45 J = 466.7625 J. The correct answer is E= 466 J.