Three children are lined up to a 50-meter race. the children all weigh the same. they start running at the same speed but child 1 runs fastest over the final 10 meters and crosses the finish line first. what is true about the kinetic energy of child 1 at the moment she crosses the finish line? A. it is less than that of the other two children

B. it is the same as the other two children

C. it is greater than that of the othere two children

D. child 1 has no kinetic energy at the moment she crosses the finish line​

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:

the answer is a)

mark brainliest

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg

a. vertically

explanation:

i tried it and took the test

if im wrong then we have different tests