Answer:
Explanation:
The problem is based on vibration in string .For it the formula is as follows :
n = k √T , n is frequency of fundamental tone , k is constant for a string of given length and T is tension in the string .
In the first case weight of sphere is equal to tension .
weight = volume of sphere x density of copper x g
= v x 8960 x g
Putting the values
300 = k √ (v x 8960 x g)
300 = k √ 87808v
When the sphere is half submerged
tension is equal to apparent weight of sphere in water
= v x 8960 x g - .5 v x 1000 x 9.8 , v is volume
= 82908v
for second case
n = k √ 82908v
dividing the two equations
n / 300 =
= .9716
n = 291.5 Hz .
Answer:
Explanation:
As we know that the ball is swinging in a circle
so here net horizontal centripetal force on the ball is due to component of the tension force
so we will have
also we know that
so we have
now we have
now we have
<h2>
SOLUTION OF EACH CASES ARE GIVEN BELOW.</h2>
Explanation:
We know magnetic field due to a charge q moving with a velocity v .
Case A:
r=0.5i
Putting value of r, q and v .
We get,
Case B:
r=0.5 j
B=0
Case C:
We get,
Case D:
We get , .
Learn more:
Magnetism
brainly.com/question/14188434
Black peppered moths had adapted to camoflage into their surroundings. Seeing as there was more pollution during the industrial revolution that made trees etc darker, the moths could camoflage more easily than other coloured moths who would have been more obvious to predators. These moths survived whereas the others did not. The surviving moths bred with other peppered moths to reproduce even more peppered moths who also survived.