ray diagram for a double concave lens a focal length 4 cm when object placed at 3cm &5 cms in principle axis​

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost

Atoaster oven has a resistive heating element. the average rate at which it dissipates energy as thermal energy is 1.00 \(\rm kw\). in the united states, emf amplitude in household circuits is \(\mathcal e_{\max}\) = 170 \({\rm \; v}\) and the \(\rm ac\) oscillation rate is 60 \(\rm hz\). part a what is the root-mean-square current through the heating element?

Which if the following types of research is conducted on multiple occasions over time