Please explain step by step and I just want question 2-6 The answers are (a)=-1 and (b)=-1 4-of-14- + Automatic Zoom An electric adaptor for a notebook computer (converting 110V to 19V) operates 10°C warmer than the surrounding temperature. Determine the sign of (a) Wext and (b) Q interactions. 2-6 19 V 110 V A block of ice dropped into a tank of water as shown begins melting. Identify the interactions for the (a) ice as a system, (h) water in the tank as a system, and (c) water and ice together as a system. 2-7 9.29 AM 3 Solution a) Consider the adapter as a system. To the system a higher voltage is given as input and lower voltage is got as an output. So to reduce the voltage some work is done on the sytem to reduce the voltage . As work is done on the system its sign will be negative. The adapter is said to be at 100C higher than the surrounding temperature. So there will be a heat transfer from adapter to the surroundings. As the heat transfer occurs from the system, its sign will be negative..

1. Please explain step by step and I just want question 2-6
The answers are (a)=-1 and (b)=-1 4-of-14- + Automatic Zoom An electric adaptor for a
notebook computer (converting 110V to 19V) operates 10°C warmer than the surrounding
temperature. Determine the sign of (a) Wext and (b) Q interactions. 2-6 19 V 110 V A block of
ice dropped into a tank of water as shown begins melting. Identify the interactions for the (a) ice
as a system, (h) water in the tank as a system, and (c) water and ice together as a system. 2-7
9.29 AM 3
Solution
a) Consider the adapter as a system. To the system a higher voltage is given as input and lower
voltage is got as an output. So to reduce the voltage some work is done on the sytem to reduce
the voltage . As work is done on the system its sign will be negative.
The adapter is said to be at 100C higher than the surrounding temperature. So there will be a heat
transfer from adapter to the surroundings. As the heat transfer occurs from the system, its sign
will be negative.