Acopper-nickel alloy of composition 50 wt% ni-50 wt% cu is slowly heated from a temperature of 1200°c (2190 °f). (a) at what temperature does the first liquid phase form? (b) what is the composition of this liquid phase? (c) at what temperature does complete melting of the alloy occur? (d) what is the composition of the last solid remaining prior to complete melting?

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.

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Bis the answerhope it !