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Question
The ideal efficiency for a heat engine operating between the temperatures of 227C and 27C isA) 20%.
B) 25%.
C) 40%.
D) 88%.
E) none of the above
Answer
This answer is hidden. It contains 1 characters.
Related questions
Q:
When a living cell doubles in diameter, it has eight times the mass to be nourished, and the amount of membrane through which it feeds is
A) only twice as much.
B) only four times as much.
C) also eight times as much.
D) more than eight times as much.
Q:
Suppose you put a chocolate layer on pieces of candy. Compared with the amount of chocolate used to cover 1 pound of large pieces, if you cover 1 pound of smaller pieces you'll use
A) less chocolate.
B) the same amount of chocolate.
C) more chocolate.
D) makes no difference
Q:
A 1-centimeter cubed sugar cube scaled up by a factor of 10 has a total surface area of
A) 60 cm2.
B) 600 cm2.
C) 6000 cm2.
D) none of the above
Q:
A 1-centimeter cubed sugar cube scaled up by a factor of 10 has a volume of
A) 10 cm3.
B) 100 cm3.
C) 1000 cm3.
D) none of the above
Q:
Lillian sees a chair at the Exploratorium that has been scaled up by three. In attempting to lift it, she finds the chair is
A) three times as heavy.
B) six times as heavy.
C) nine times as heavy.
D) more than nine times as heavy.
Q:
Which has more skin compared to its body weight?
A) an elephant
B) a mouse
C) both the same
Q:
Which has more skin?
A) an elephant
B) a mouse
C) both the same
Q:
The Gateway Arch in St. Louis, Missouri, is a
A) parabola.
B) hyberbola.
C) catenary.
Q:
An un-stretched hanging spring is 50 cm long. Suspending a 100-N block from it increases its length to 60 cm. Adding another 100-N block makes the spring's length
A) 60 cm.
B) 70 cm.
C) 80 cm.
D) 100 cm.
E) 120 cm.
Q:
An iron block in a furnace is heated and consequently expands, which means that its density is
A) less.
B) the same.
C) more.
Q:
If the volume of an object were doubled while its mass remained the same, its density would
A) be half.
B) double.
C) stay the same.
D) be four times as great.
Q:
Nuclei of atoms that make up a newborn baby were manufactured in
A) the mother's womb.
B) the food the mother eats before delivery.
C) ancient stars.
D) the Earth.
E) none of the above
Q:
Which of the following is NOT a compound?
A) air
B) ammonia
C) water
D) salt
E) all are compounds
Q:
What is the molecular mass of a water molecule?
A) 10 amu
B) 12 amu
C) 15 amu
D) 18 amu
E) none of the above
Q:
A pair of helium nuclei fused together produces
A) helium isotope.
B) lithium.
C) beryllium.
D) carbon.
E) iron.
Q:
Which of these atoms has the greatest amount of electrical charge in its nucleus?
A) helium
B) carbon
C) iron
D) gold
E) uranium
Q:
A force that determines the chemical properties of an atom is
A) a friction force.
B) a nuclear force.
C) a gravitational force.
D) an electrical force.
E) none of the above
Q:
Which is the smallest particle?
A) molecule
B) atom
C) proton
D) neutron
E) quark
Q:
The difficulty of taking a photograph of an atom with light is
A) unwanted diffraction.
B) that atoms are smaller than wavelengths of light.
C) both of these
D) neither of these
Q:
Assuming all the atoms exhaled by Julius Caesar in his last dying breath are still in the atmosphere, we breathe in at least one of them each
A) single breath.
B) day.
C) month.
D) ten years.
E) can't say for some people breathe a few of Caesar's atoms daily, while others never.
Q:
The chance that at least one of the atoms exhaled in your previous breath will be inhaled in your next breath is
A) very low.
B) very high.
C) zero.
Q:
Pioneer 10 was able to escape the solar system by
A) having a sufficient escape velocity at launch.
B) "bouncing off" Jupiter like a tennis ball bouncing off an approaching tennis racket.
C) refueling via solar cells.
D) nuclear-powered sustained thrust.
Q:
A projectile that is fired vertically from the surface of Earth at 8 km/s will
A) go into circular orbit about Earth.
B) rise and fall back to Earth's surface.
C) follow an uncertain path.
D) escape from Earth.
Q:
A projectile that is fired vertically from the surface of Earth at 5 km/s will
A) go into circular about Earth.
B) go into an elliptical orbit about Earth.
C) rise and fall back to Earth's surface.
D) none of the above
Q:
Escape speed from the Moon is
A) about the same as from Earth.
B) much greater than from Earth.
C) much less than from Earth.
Q:
When the potential energy of a satellite decreases
A) kinetic energy also decreases.
B) its kinetic energy correspondingly increases.
C) its distance from the orbiting body increases.
D) none of the above
Q:
The conservation of energy applies to satellites in
A) circular orbit.
B) elliptical orbit.
C) both of these
D) neither of these
Q:
According to Kepler, the line from the Sun to any planet sweeps out equal areas of space
A) with each complete revolution.
B) only when the paths are ellipses.
C) in equal time intervals.
Q:
The focal point of a satellite in orbit about the Sun is
A) inside the Sun.
B) outside the Sun.
C) both of these
D) neither of these
Q:
The orbital path of a satellite has two focal points. When both focal points are together
A) the satellite path is an ellipse.
B) the satellite path is a circle.
C) satellites lose speed.