Physics Midterm 1

900,000 J

A car has a mass of 2000 kg and is traveling at a speed of 30 m/s, its kinetic energy is..

50

According to estimate, the world petroleum will be used up in less than ___ years

55 bbl

How many barrels of oil equivalent of energy per capita are used annually in the USA?

83

In the US fossil fuels account for about __ % of our energy use.

11905 Btu

In the United States, the average person eats about 3000 food calories per day, this is equivalent to..

motions and position

Kinetic and potential energies are energies of ___ and ___, respectively.

2,685,600

One horsepower for one hour represents how many joules

- Joule (J) - Btu - kilowatt-hour (kWh) - calorie (cal)

Units that represent energy

- joules/sec (J/s) - horsepower (hp) - watt (W) - kilowatt

Units that represent power

- abundance - availability - cheap price

What are 3 advantages of using coal?

1. Fossil fuel resource is limited in amount and it will be used up soon. 2. Unintended environmental consequences result

What are the 2 major problems created by depending on fossil fuels for most of our energy?

5.5*10^9 bbl

What is the current annual oil consumption in the USA?

Uranium

Which of the following is a non-renewable resource?

900,000 J

a car has a mass of 2,000 kg, it takes 6 seconds, starting from rest, to accelerate to reach a speed of 65 mph (30 m/s). how much kinetic energy does the car have at that speed?

14

a typical US citizen consumes _ times as much energy as does a typical citizen of India

40 years

at our present rate of consumption, the estimated total remaining recoverable petroleum of the United States would supply our needs for about..

- methane - tar sand - coal

name 3 things that are not considered as petroleum

11.0 kW

per person, the energy consumption in the United states is about 3.3*10^8 Btu/yr. This is equal to the power of..

70%

the average percentage of total petroleum left in the ground after primary and secondary recovery has been accomplished in about

A law of physics with no known exceptions

the principle of energy conservation is..

145 W

what is the average power of this energy intake?

chemical energy, heat, mechanical energy, electrical energy

which of the following sequences of energy conversion fits the situation of coal-burning power plant?