Aresistor is connected across the terminals of a 9.0-v battery, which delivers 2.1 x 105 j of energy to the resistor in 7.0 hours. what is the resistance of the resistor?

9.72 Ω

Explanation:

given,

Potential of battery,V = 9 V

Energy of the resistor = 2.1 x 10⁵ J

time = 7 Hr

       = 7 x 3600 = 25200 s

Power,P =

           =

           = 8.33 W

Resistance=

                 =

                 = 9.72 Ω

the resistance of the resistor is equal to 9.72 Ω

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.