m = mass of the ball attached to friction less surface = 2 kg
r = radius of the circle in which the ball moves = 0.5 meter
T = tension force in the string = 16 N
F = centripetal force
centripetal force is given as
F = m v²/r
the centripetal force required to move in circle is being provided by the tension force here , hence we can write
T = F
T = m v²/r
Tr = m v²
v² = Tr/m
v = √(Tr/m)
inserting the values in the equation above
v = √(16 (0.5)/2)
v = 2 m/s
The loops must the coil have to generate a maximum emf of 2500 will be 439.
<h3 /><h3>What is the faraday law of electromagnetic induction?</h3>
According to Faraday's law of electromagnetic induction, the rate of change of magnetic flux linked with the coil is responsible for generating emf in the coil resulting in the flow of amount of current.
Given data;
Area,A = 0.239 m²
Angular velocity,ω=373 rad/sec
Magnetic field,B=0.0639 T
Maximum emf,E= 2500V
The formula for the maximum induced voltage is;
E{max} = N × B × A × ω
2500 = N × 0.639 × 0.0239 × 373
N = 438.66
N = 439 \ turns
Hence, loops must the coil have to generate a maximum emf of 2500 will be 439.
To learn more about the faraday law of electromagnetic induction refer to;
brainly.com/question/26334813
#SPJ1
- Initial velocity=u=30m/s
- Final velocity=v=10m/s
- Time=5s
Now
For the second question
Using 2nd equation of motion
The answer is b . Because they <span>are gaps in the geologic record that may indicate episodes of crustal deformation, erosion, and sea level variations. They are a feature of stratified rocks, and are therefore usually found in sediments (but may also occur in stratified volcanics)</span>
Here, Your Secret word would be Respiratory system of human body which helps in transporting/Exchange in gases
In short, Your Answer would be "Respiratory"
Hope this helps!