HS Sample Set 11, Round 7 from NSB
Two billiard balls of equal mass are travelling collinearly in opposite directions. One has a velocity of 5 meters per second, the other has a velocity of 3 meters per second. They collide completely inelastically. In meters per second, what is their final speed?
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A 3-volt battery is connected to two 4-ohm resistors that are connected in parallel. What is the power, in watts, dissipated by this circuit?
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Sap that is used in making maple syrup is transported by what organ? W) Epidermis X) Xylem Y) Phloem Z) Pith
W: W) Epidermis
X: X) Xylem
Y: Y) Phloem
Z: Z) Pith
Answer: X) X) Xylem
The sliding filament theory of muscle contraction primarily involves what two proteins?
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Which of the following forms of energy has the lowest average cost of operation and maintenance? W) Solar X) Wind Y) Geothermal Z) Hydro
W: W) Solar
X: X) Wind
Y: Y) Geothermal
Z: Z) Hydro
Answer: W) W) Solar
One of the largest solar power plants in the U.S. is at Ivanpah in southern California. It converts solar energy into electricity via what mechanism? W) Molten salt contacting thermoelectrics X) Direct photovoltaic panels Y) Photoelectrolysis to produce hydrogen gas Z) Superheated steam through a turbine
W: W) Molten salt contacting thermoelectrics
X: X) Direct photovoltaic panels
Y: Y) Photoelectrolysis to produce hydrogen gas
Z: Z) Superheated steam through a turbine
Answer: Z) Z) Superheated steam through a turbine
What element has the highest ionization energy? W) Hydrogen X) Helium Y) Lithium Z) Beryllium
W: W) Hydrogen
X: X) Helium
Y: Y) Lithium
Z: Z) Beryllium
Answer: X) X) Helium
Which of the following compounds has the highest polarity? W) Carbon tetrachloride X) Dimethyl ether Y) Boron trifluoride Z) Trinitrotoluene
W: W) Carbon tetrachloride
X: X) Dimethyl ether
Y: Y) Boron trifluoride
Z: Z) Trinitrotoluene
Answer: X) X) Dimethyl ether
What is the term for a fluidized mixture of solid to semi-solid fragments and hot expanding gases that flows under gravity down the flanks of a volcano during an eruption? W) Pyroclastic surge X) Lahar Y) Pyroclastic flow Z) Lava flow
W: W) Pyroclastic surge
X: X) Lahar
Y: Y) Pyroclastic flow
Z: Z) Lava flow
Answer: Y) Y) Pyroclastic flow
Identify all of the following three locations where continental ice sheets can be currently found: 1) Greenland; 2) North America; 3) Antarctica.
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Two coplanar circles have a common chord. Which of the following best describes the quadrilateral that has as opposite vertices the centers of the two circles and the endpoints of the common chord? W) Kite X) Parallelogram Y) Rhombus Z) Square
W: W) Kite
X: X) Parallelogram
Y: Y) Rhombus
Z: Z) Square
Answer: W) W) Kite
A particle’s position \(x\) at time \(t\) is defined by the equation \[ x(t) = 2t^3 - 21t^2 + 60t - 36. \] At what time or times \(t\) is the particle at rest?
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Rank the following three ions in terms of increasing radius: 1) Na⁺; 2) Be²⁺; 3) Li⁺.
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What allotrope of phosphorus, which can be prepared by heating white phosphorus to 300 °C in the absence of air, is composed of amorphous interlocking P₄ tetrahedra?
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Most room-temperature permanent magnets are magnets due to what phenomenon that is commonly seen in iron, nickel, and cobalt?
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An atom of uranium-235 at rest undergoes spontaneous nuclear fission to form krypton-94 and barium-141. If the barium atom moves away at 4 km/s, what is the speed, to the nearest kilometer per second, of the krypton atom?
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The La Brea Tar Pits of Los Angeles, California, are famous for the quantity and diversity of fossils of extinct Pleistocene animals. Which of the following is closest to the number of years ago that these pits formed? W) 40,000 X) 400,000 Y) 4,000,000 Z) 40,000,000
W: W) 40,000
X: X) 400,000
Y: Y) 4,000,000
Z: Z) 40,000,000
Answer: W) W) 40,000
Identify all of the following three statements that are true regarding the waves produced by earthquakes: 1) S waves are transverse waves; 2) S waves only travel through solids; 3) S waves travel faster than P waves.
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Apical dominance in plants means that: W) The apical bud stimulates vertical growth X) The apical bud inhibits auxin production Y) The apical bud stimulates floral development Z) The apical bud inhibits the growth of lateral buds
W: W) The apical bud stimulates vertical growth
X: X) The apical bud inhibits auxin production
Y: Y) The apical bud stimulates floral development
Z: Z) The apical bud inhibits the growth of lateral buds
Answer: Z) Z) The apical bud inhibits the growth of lateral buds
Identify all of the following three structures that possess a double membrane: 1) Lysosome; 2) Nucleus; 3) Ribosome.
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Immediately after being removed from a fission reactor, spent fuel rods will be placed where? W) Underground X) Underwater Y) Reprocessing plants Z) MOX factories
W: W) Underground
X: X) Underwater
Y: Y) Reprocessing plants
Z: Z) MOX factories
Answer: X) X) Underwater
What are the primary mobile charge carriers in the sulfonated fluoropolymer ion-exchange membranes used in commercial fuel cells? W) Hydroxide ions X) Sodium cations Y) Water Z) Protons
W: W) Hydroxide ions
X: X) Sodium cations
Y: Y) Water
Z: Z) Protons
Answer: Z) Z) Protons
A prism with 7 faces has how many edges?
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Evaluate the summation, from \(n = 0\) to infinity, of the fraction with numerator 12 and denominator \(4^n\).
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Greenhouse gases build up in the atmosphere of Earth and limit the amount of heat escaping back into space. Which of the following is not a greenhouse gas for Earth? W) Carbon dioxide X) Argon Y) Nitrous oxide Z) Methane
W: W) Carbon dioxide
X: X) Argon
Y: Y) Nitrous oxide
Z: Z) Methane
Answer: X) X) Argon
What coordinate is the celestial-sphere equivalent of latitude? W) Declination X) Right-ascension Y) Altitude Z) Zenith angle
W: W) Declination
X: X) Right-ascension
Y: Y) Altitude
Z: Z) Zenith angle
Answer: W) W) Declination
What is the log base 3 of 243?
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What is the integer part of the geometric mean of 6 and 80?
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Which of the following statements best explains why chloroacetic acid is a stronger acid than acetic acid? W) Resonance delocalization of the conjugate base chloroacetate X) Withdrawal of electron density by chlorine Y) Donation of electron density by chlorine Z) Greater electronegativity of chlorine than oxygen
W: W) Resonance delocalization of the conjugate base chloroacetate
X: X) Withdrawal of electron density by chlorine
Y: Y) Donation of electron density by chlorine
Z: Z) Greater electronegativity of chlorine than oxygen
Answer: X) X) Withdrawal of electron density by chlorine
What is the name for the wavelength at which a sample's absorbance does not change during a reaction?
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Moderators in nuclear reactors are used because of their ability to absorb energy from what particles?
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DOE researchers recently published about the development of a complex oxide alloy that, rather than being primarily stabilized by chemical bonding, is stabilized by what state function?
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Capillary action refers to which of the following? W) The tendency for objects to flee the center of circular motion X) The change in frequency of a wave depending on the relative motion of the source Y) The property by which liquids can flow against gravity Z) The tendency for fluids to dissipate energy as heat
W: W) The tendency for objects to flee the center of circular motion
X: X) The change in frequency of a wave depending on the relative motion of the source
Y: Y) The property by which liquids can flow against gravity
Z: Z) The tendency for fluids to dissipate energy as heat
Answer: Y) Y) The property by which liquids can flow against gravity
What is the name of the law of electromagnetism that states that the force exerted on each other by two charged particles is inversely proportional to the square of the distance between them?
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Calcium ions activate muscle contraction because they move what protein from thin filaments?
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Ferredoxin is an electron-transfer protein that contains which of the following? W) Heme group X) Iron-sulfur cluster Y) Zinc finger Z) Leucine zipper
W: W) Heme group
X: X) Iron-sulfur cluster
Y: Y) Zinc finger
Z: Z) Leucine zipper
Answer: X) X) Iron-sulfur cluster
What is the slope of the line with equation \(3x - 8y = -24\)?
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A class of 16 students selects a different student of the month each month during March, April, and May. In how many different ways can the 3 honored students be selected?
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What two blood-sugar-relevant hormones are secreted by the islets of Langerhans?
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What acid is produced by parietal cells?
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For the tri-iodide ion, what is the hybridization of the central iodine atom?
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Identify all of the following three compounds with dsp³-hybridized central atoms: 1) Silicon tetrafluoride; 2) Sulfur hexafluoride; 3) Sulfur tetrafluoride.
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What type of tide is caused when the gravitational forces of the Sun and Moon coincide?
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Pahoehoe and a‘a are lava flows associated with what type of magma?
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A 1000-kilogram car traveling at 15 meters per second takes a turn on a flat surface with a radius of 50 meters. In kilo-newtons, what is the force of friction on the car?
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A 50-kilogram superhero is standing on a frictionless surface. He fires a 100-gram arrow horizontally at a speed of 200 meters per second at a target. In meters per second, what is his speed afterwards?
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