Question

A resultant of two vectors makes 30" with one vector and 45° with the other. Find the two

vectors if the resultant has the magnitude 15​

Answer 1

Refer to Attachment........ :) $\large\rm$

Answer 2

Answer:

Energy dissipated \large\rm { = Pt = I^{2} Rt}=Pt=I

2

Rt Joules

Consider Ohm's law \large\rm { V=IR. }V=IR.

In this case the resistors are connected in series and hence, the total resistance is 4+2=6 ohms. In a series circuit, the current remains the same throughout the circuit and so we use the \large\rm { I²Rt }I²Rt Joules formula.

The total current in the circuit is calculated as \large\rm { I = V/R = 6/6 = 1 \ A}I=V/R=6/6=1 A

Therefore, the power dissipated P across the 4 ohm resistor for 5 s

\large\rm { = 1^{2} × 4 × 5 = 20 }=1

2

×4×5=20 Joules

so, answer is 20 Joules