A system that had work done on it but which receives or loses no heat from or to the surroundings has

w 0

w = - ΔE

w > 0, ΔE < 0

w = ΔE

w >0, ΔE < 0

Explanation:

As per the first law of thermodynamics,

ΔE = Q - W

Where,

ΔE = Change in internal energy

Q = Heat receive or heat loss

W = work done

Work done by the system is always - ve.

Work done on the system is always + ve.

It is given that work done on the system.

W = + ve or W > 0

As, there is no heat receive or heat loss

So, Q = 0

Now, as per the first law of thermodynamics.

ΔE = Q - W

Q = 0

ΔE = - W

or ΔE < 0

So, answer would be w > 0, ΔE < 0