00:01
Hello students in this question a rubber sphere is being given and the first part of the question we need to find out the terminal speed of the rubber spear which is taken as small letter v.
00:11
Now in order to find the value of v a few data are been given which include density of the spear row as to be equal to 0 .94 gram per centimeter cube.
00:23
On the other hand the radius of the spear is taken as small letter r which is equal to 7 centimeter.
00:30
Air density is taken as rho a which is equal to 1 .2 kilogram per meter cube.
00:37
Drag coefficient cd is taken to be 0 .5 and here the mass of the sphere can be calculated using the equation mass small letter m to be equal to its density row s into its volume which is taken as vs.
00:53
Where we can say that the volume of the sphere vs will be equal to 4 by 3 into 5 .3 into 5.
01:00
Into r cube.
01:01
Thereby substituting the value of vs in the above equation of mass, our equation changes as mass m to be equal to row s into 4 by 3 into 5 into r cube.
01:13
Thereby substituting the values in this equation and undergoing simplification, we get the mass of the sphere small letter m to be equal to 1 .349 kilogram.
01:23
Now here it should be note that at terminal velocity v the net force f will be equal to a value...