Chapter 8.2, Problem 46SR

a

To determine

To calculate: The biggest source of energy for the united states from the circle graph.

Answer to Problem 46SR

The biggest source of energy is Petroleum.

Explanation of Solution

Given information: A circle graph given where the source of United states energy shown as percentage. Petroleum = 40%, natural gas = 23%, coal = 23%, nuclear power = 8%, hydropower = 3%, other = 3%. Also given, Petroleum contributed 40 quadrillion Btu.

Calculation:

The biggest source of energy is Petroleum as it gives 40%.

b

To determine

To calculate: The amount of Btu contributed by hydropower.

Answer to Problem 46SR

Hydropower contributed 3 quadrillion Btu energy.

Explanation of Solution

Given information: A circle graph given where the source of United states energy shown as percentage. Petroleum = 40%, natural gas = 23%, coal = 23%, nuclear power = 8%, hydropower = 3%, other = 3%. Also given, Petroleum contributed 40 quadrillion Btu.

Calculation:

Petroleum contributed 40 quadrillion Btu.

  $\therefore$ 40% of the total energy = 40 quadrillion Btu.

1% of the total energy = $\frac{40}{40}=1$ quadrillion Btu.

Hydropower contributed 3%.

  $\therefore$ 3% of energy = 3 quadrillion Btu.

The energy contributed by hydropower = 3 quadrillion Btu.