The sound heard following reflections from a hard surface such as a cliff or a wall is known as an echo. The time is taken to hear the echo will be 0.5 seconds.
<h3 /><h3>What is an echo?</h3>
The repeated same voice heard by the person when the voice is reflected from hard surfaces such as the wall is known as the echo.
Dolphins utilize the echo to identify for navigation. Sonar is a similar concept. Submarines use sonar teqnique.
speed of sound wave = 320 m/sec
distance from the reference = 80 m
as we know that
Distance = speed × time
The total time to hear the echo will be twice the time travel on one side.
Total time = 2× 0.25
Total time = 0.5 sec
Hence the time is taken to hear the echo will be 0.5 seconds.
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Conservation tillage practices help reduce soil erosion and maintain soil nutrient levels.
<u>Explanation:</u>
The approach that helps in the reduction of doing tillage practices and also reducing its frequency. this is done for obtaining certain benefits for both environment and economic. This mainly focuses on providing sustainability by leaving some plants remaining in the soil.
It aims in decreasing the emission of gases of greenhouse effects like carbon dioxide. Using these practices helps in reducing the erosion and runoffs. This will promote health of the soil because the nutrients are not take off form the soil due to soil erosion and runoffs.
<h3><u>Given</u><u>:</u><u>-</u></h3>
Force,F = 10,000 N
Acceleration,a = 27 m/s²
<h3><u>To</u><u> </u><u>be</u><u> </u><u>calculated:-</u><u> </u></h3>
Calculate the mass.
<h3><u>Solution:-</u><u> </u></h3>
As We know that,
★ Putting the values in the above formula,we get:
Answer:
F_B = 0.12N
Explanation:
In order to calculate the magnetic force on the charge, you use the following formula:
(1)
q: charge of the particle = 4μC = 4*10^-6 C
v: speed of the charge = 7.5*10^4 m/s
B: magnitude of the magnetic field = 0.4T
The direction of the motion of the charge is perpendicular to the direction of the magnetic field. Then, the magnitude of the magnetic force is:
The magnetic force on the charge is 0.12N
Answer:
7213.7kg/m³
Explanation:
Given parameters:
Volume of the metal chunk = 0.131m³
Mass of the metal chunk = 945kg
Unknown:
Density of the metal chunk = ?
Solution :
To solve this problem, density is the mass per unit volume. It is mathematically expressed as;
Density =
So;
Density = = 7213.7kg/m³