Two students both kick a soccer ball. Havanna's ball travels three times as fast at Mitzi's ball. How does the kinetic energy of the two soccer balls compare?

The kinetic energy of Havanna's ball is 9 times the kinetic energy of Mitzi's ball.

Explanation:

Let the velocity of Mitzi's ball = v₁

then, the velocity of Havanna's ball = 3v₁

Kinetic energy is given as;

K.E = ¹/₂mv²

Where;

m is mass of the object

v is velocity of the object

Kinetic energy of Mitzi's ball is given by;

K.E(m) = ¹/₂mv₁²

kinetic energy of Havanna's ball is given by;

K.E(H) = ¹/₂m(3v₁)²

K.E(H) = ¹/₂m x 9v₁²

K.E(H) = 9(¹/₂mv₁²)

K.E(H) = 9(K.E(m) )

Therefore, the kinetic energy of Havanna's ball is 9 times the kinetic energy of Mitzi's ball.

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

terd muffin is the correct answer