Classify the following as a physical change or chemical change. Column A
1.
Chopping wood:
Chopping wood
2.
Burning Wood:
Burning Wood
3.
Ice cube melting:
Ice cube melting
4.
Steam from a shower:
Steam from a shower
5.
A bike rusting:
A bike rusting
Column B
a. Physical Change
b. Chemical Change

Identify the type of synthetic material used in each object

In a system, when potential energy decreases, then entropy also decreases. true false

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_