Please I need help with this question (see image).
Show workings where necessary.

I think the reason why ice is forming on the aluminium lumps and not the beaker, is because:

The beaker is already on the same temperature as the mixture inside it: as a result, there is no heat transfer.

on the other hand, the Aluminium Lumps is at a way lower temperature than the mixture and as a result, there is heat transfer from the water around the lumps to the aluminium Lumps itself.

turning the water into ice.

Heat is lost from the water, and gained on the aluminium.

Since the water was turned to ice.

we can say that the final temperature of the heat transfer process is 0°C.

Notice that we'll be making use of the latent heat of fusion for ice. since water is being converted to ice at 0°C.( workout is in above attachment)

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:

i don’t know what the answer is i wish i