the hoover dam in the u. s produces 2 x 10 ^9 watts of electricity and is composed of 7 x 10^9 kg of concrete. concrete requires 1mj of energy to produce 1 kg
1) how much energy did it take to produce the dam?
2) how long is the "energy payback time" for the dam?
show your work.

(I). The energy is .

(II). The time is .

Step-by-step explanation:

Given that,

Power

Mass of concrete

Concrete requires 1 MJ of energy to produce 1 kg.

(I). We need to calculate the energy

Using formula of energy

1 kg concrete required 10⁶ J energy.

So, The energy is

The energy is .

(II). We need to calculate the time

Using formula of power

Put the value into the formula

Hence, (I). The energy is .

(II). The time is .

given hc ∥ gd.¯¯¯¯¯¯which statement is true

step-by-step explanation:

∠cbe and ∠deb are same-side interior angles