About how fast are molecules in air moving?
1000 ft/sec
In a bucket of water, the instantaneous speed of the molecules is closest to
approximately 1000 ft per second
A refrigerator with its door open is operating in a room. It
warms the room
Ice melts at
0 C
The velocity of sound
increases when temperature increases
If a gasoline engine produces a hotter explosion, then the efficiency of the engine should
increase
A cup full of water and made of plastic feels warmer than one made of glass because
plastic conducts heat less than glass
The speed of sound is approximately
1000 ft/sec
Sea level is rising from global warming. The main cause is
expanding sea water (due to rise in temperature)
At Mach 10, if all the energy of a meteorite went into heating the meteorite, its temperature would be about
100,000
One watt is equivalent to
one joule/second
The asteroid that killed the dinosaurs exploded because
it got very hot from the impact
Hybrid vehicles run on
electric power and gasoline
What is the main reason that hydrogen-driven automobiles have not replaced gasoline ones?
hydrogen is too difficult to store in an automobile
Which of the following contains the most energy per gram?
uranium
The kinetic energy of a typical 1-gram meteor is approximately equal to the energy of
150 grams of TNT, 10 grams of gasoline
A limitation for all electric automobiles is
low energy density per battery
Solar power is about
1 kW per square meter
1 gigawatt per square km
A large nuclear power plant delivers energy of about
1 gigawatt
You have 10 tungsten bulbs, and each uses 100 watts. You leave them all on for an hour. The energy used is
1 kilowatt-hour