If the current in this circuit is 3 a, what must be the value of r3? it's 5 ω

5

Explanation:

Explanation :

It is given that,

In the given figure all the three resistors are in series.

Current flowing in the circuit,

Voltage,

We know that in series circuit the current flowing in all resistors is same.

Using Ohm's law, we get:

Hence, this is the required solution.    

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

80cm/s.

24cm/s.

53.3cm/s.