A wagon has a mass of 12 kg it has an acceleration of 3 m/s/s 2 what is the net force that was required for the wagon to have this acceleration Pls pls pls help me solve this problem

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

Which body part transports oxygen removes waste materials in carries nutrients to the body as part of the circulatory system

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) =_