Me out to solve this problem because it looks difficult

the time when he starts to deaccelerate will be =

distance between a and b at the starting = x-y = 12.6m

Explanation:

writing equation of motion for traveller A v = u + at

where v is the final  u the initial velocity and a is the acceleration

u = 10 v= 8 and a = -5 applying the values in the equation we get t =

therefore athlete A deaccelerates from 10 to 8 m/s in s

so the time when he starts to deaccelerate will be = 2 -

                                                                                    =

writing equation of motion for B

v = u + at

where v= 8 u = 0 and t = 2

therefore applying the values a= 4

therefore distance travelled be B in 2 =

therefore   =x+ 8m

for traveller b distance travelled in 2  = y + 10× + 10× + -5×

= y+19.6 m

given

therefore x-y-11.6 = 1

therefore distance between a and b at the starting = x-y = 12.6m

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 earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d