<u>Answer:</u>
Mass of base ball
<u>Explanation:</u>
Circumference of baseball = 2πr = 23 cm
So radius of baseball = 3.66 cm =
m
Mass per unit volume of baseball = Mass per unit volume of neutron or proton.
Mass of proton =
kg
Diameter of proton =
m
Radius of proton =
m
Volume of ball = 
Now substituting all values in Mass per unit volume of baseball = Mass per unit volume of neutron or proton.


So mass of base ball
Momentum is conserved.
p = m₁v₁ + m₂v₂ = constant
Momentum before the collision(kick):
p = 80 * 0 + 4 * 0 = 0
Momentum after the collision:
p = 80 * v₁ + 4 * 15 = 0
Solve for v₁.
The correct answer is:
<span>paramagnetism
In fact, paramagnetic materials, when they are placed in a magnetic field, they form an internal magnetic field parallel to the external one and in the same direction. However, unlike ferromagnetic materials, they do not retain their magnetization, so when the external magnetic field is removed, their internal induced magnetic field disappears.</span>
Electric field at the center of circular arc is given by the formula

here we know that




also we know that

now from above formula

