If a gasoline engine produces a hotter explosion, then the efficiency of the engine
should
a. be the same
b. go up
c. go down
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go up
,For a typical auto, the fraction of the gasoline energy wasted as heat is about
a. 1%
b. 10%
c. 20%
d. 80%
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80%
Fission fragments are
a. harmless particles emitted in radioactivity
b. among the most dangerous kind of radiation
c. ghost-like particles that pass through the Earth
d. the source of most energy in the sun
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among the most dangerous kind of radiation
In a bucket of water, the instantaneous speed of the molecules is closest to
a. zero, since they don't move
b. whatever speed the wood is moving
c. approximately 1.7 m/s
d. approximately 1000 ft/s
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, approximately 1000 ft/s
Electricity from a AAA battery costs the consumer about
a. 1c per kilowatt-hour
b. 10c per kilowatt-hour
c. $1 per kilowatt-hour
d. $1000 per kilowatt-hour
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$1000 per kilowatt-hour
The altitude of a geosynchronous satellite is closest to
a. 200 miles
b. 22,000 miles
c. 2,000,000 miles
d. 93,000,000 miles
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22,000 miles
The efficiency of inexpensive solar cells is closest to
a. 1%
b. 12%
c. 65%
d. 100%
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, 12%
Absolute zero is the temperature of
a. frozen water
b. the universe
c. liquid helium
d. nothing
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the universe
If the half-life of an element is big, that means that
a. it decays faster than one with a small half life
b. it decays slower than one with a small half life
c. it belongs to a very heavy element
d. it emits lots of neutrons when it decays
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it decays slower than one with a small half life
Rockets fly by
A. using antigravity
B. pushing air downwards
C. pushing fuel downward
D. being lighter than air
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should
a. be the same
b. go up
c. go down
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go up
,For a typical auto, the fraction of the gasoline energy wasted as heat is about
a. 1%
b. 10%
c. 20%
d. 80%
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80%
Fission fragments are
a. harmless particles emitted in radioactivity
b. among the most dangerous kind of radiation
c. ghost-like particles that pass through the Earth
d. the source of most energy in the sun
Give this one a try later!
among the most dangerous kind of radiation
In a bucket of water, the instantaneous speed of the molecules is closest to
a. zero, since they don't move
b. whatever speed the wood is moving
c. approximately 1.7 m/s
d. approximately 1000 ft/s
Give this one a try later!
, approximately 1000 ft/s
Electricity from a AAA battery costs the consumer about
a. 1c per kilowatt-hour
b. 10c per kilowatt-hour
c. $1 per kilowatt-hour
d. $1000 per kilowatt-hour
Give this one a try later!
$1000 per kilowatt-hour
The altitude of a geosynchronous satellite is closest to
a. 200 miles
b. 22,000 miles
c. 2,000,000 miles
d. 93,000,000 miles
Give this one a try later!
22,000 miles
The efficiency of inexpensive solar cells is closest to
a. 1%
b. 12%
c. 65%
d. 100%
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, 12%
Absolute zero is the temperature of
a. frozen water
b. the universe
c. liquid helium
d. nothing
Give this one a try later!
the universe
If the half-life of an element is big, that means that
a. it decays faster than one with a small half life
b. it decays slower than one with a small half life
c. it belongs to a very heavy element
d. it emits lots of neutrons when it decays
Give this one a try later!
it decays slower than one with a small half life
Rockets fly by
A. using antigravity
B. pushing air downwards
C. pushing fuel downward
D. being lighter than air
Give this one a try later!
