Physical Science Final
A system of 12 electrons and 18 protons has a net charge of
9.6 × 10e-19 C.
Which has more volume, a liter or a quart?
A liter
T/F Radio waves are electromagnetic waves of very short wavelengths.
F
T/F The Doppler effect is true only for sound waves.
F
T/F The Moon does have a magnetic field.
F
T/F Zodiacal light is due to sunlight reflected from dust particles.
F
The greater the mass of a star, the faster/slower it moves through its life cycle.
Faster
The greater the power of an engine, the faster/slower it can do work.
Faster
Which of the following is a vector quantity? None of these Time Work Power Force
Force
A very large aggregate of stars, gas, and dust held together by their mutual gravitational attraction is called a _______________.
Galaxy
The asteroid belt is between the orbits of Jupiter and Saturn. Earth and Venus. Mars and Jupiter. Earth and Mars.
Mars and Jupiter
Which planet moves the fastest?
Mercury
Rills on the Moon are believed to have been caused by
Moonquakes
T/F All waves transfer energy.
T
The average kinetic energy of the molecules in a gas is a measure of temperature. heat content. density. volume.
Temperature
The most widely accepted theory on the origin of the Moon is
The great impact theory
In a situation when there is a closed switch there is no flow of electrons there is a flow of electrons
There is a flow of electrons
A sound with a frequency of 1000 Hz is in the ______________ region of the sound spectrum.
audible
In the equation A = B/C, the A and B are said to be _______________ proportional.
directly
The imaginary line encircling Earth at its surface, halfway between the north and south geographic poles, is called the
equator
A lunar eclipse can occur only when the Moon is in or near the ______________ phase.
full
The ______________ surrounds the nucleus of a comet.
head or coma
The mathematical form of Coulomb's law is similar to that of
law of gravitation
The energy of position is called
potential energy
A mirage is an example of
refraction
The remaining core of a planetary nebula is called a _______________.
white dwarf
The oldest rocks on the Moon were formed about how many years ago?
4.4 billion
A man and a woman are sitting on a sofa with a separation distance of 2 m, the man has a mass of 70 kg and is physically attracted to the woman with a force of 5.8 x 10e-8 Newtons. What is the mass of the woman?
50kg
According to today's classification system, how many major planets are there in the solar system?
8
The International Date Line in theory is ___________, with variations to accommodate the needs of various countries. none of these a meridian a parallel a longitude a latitude
A meridian
If a negatively charged object is brought near a suspended, positively charged object, the suspended object will be repelled. charged more. discharged. attracted.
Attracted
If the voltage across a resistor is doubled, the current will
Be doubled
If a ray of light passes from air into glass, the light will bend away from the normal. bend toward the normal. travel along the normal. continue traveling in the same direction.
Bend toward the normal
The amount of heat to raise one pound of water 1 oF is known as Kilojoule Calorie British thermal unit
British thermal unit
A two-dimensional coordinate system is called a(n) ____ coordinate system.
Cartesian
In this type of interference the wave pulses tend to cancel each other out.
Destructive
Retrograde motion of a planet refers to ______________ motion. circular west-to-east east-to-west elliptical
East-to-west
The direction of the magnetic field of a bar magnet is away from the south pole. in any direction. toward the north pole. in the direction a compass would point.
In the direction a compass would point
Materials that do not conduct electricity very well due to very tight electron bonding are known as
Insulators
Wave speed is ____________ to period. directly proportional inversely proportional
Inversely proportional
The Sun is at the vernal equinox within one or two days of which of the following dates? December 22 June 21 September 22 March 21st
March 21st
Today's month is based on the _________.
Moon
The planet with the Great Dark Spot is
Neptune
Mothballs are an example of deposition sublimation
Sublimation
Sound waves cannot travel in water air vacuum steel
Vacuum
The bending of waves around corners is called
diffraction
Hubble's law is the major basis for the concept that the universe is
expanding
A(n) ______________ is an elementary particle with a charge of +1.6 × 10e-19 C.
proton
The three fusion reactions in the Sun that form helium from hydrogen are together called the
proton-proton chain
A train reduces its velocity from 16.7 m/s to 5.56 m/s in a time of 8 seconds. Find the acceleration.
-1.39 m/s2
A speed of 36 meters/sec. is equal to ______ km/hours.
130
A particular gas occupies 92 m3 at 135 kPa absolute pressure. Find the absolute pressure if the volume decreased to 75.5 m3.
164.5 kPa
For the multiplication of 7.443 m times 8.5 m, the result should be reported with how many significant figures?
2
Earth's axis completes a precession every
25,800 years
The speed of light in a material is 1.74 × 10e8 m/s. What is the index of refraction of this material?
1.72
The linear momentum of a 100.0 kg object moving around a 30.0 m circle at a constant speed of 2.20 m/s is
220 kg m/s
The plane of Earth's equator is tilted ______________° with respect to the plane of Earth's orbit about the Sun.
23.5
The amount of heat necessary to change 1 kg of a solid into a liquid at the same temperature is called the
latent heat of fusion
A visual defect wherein a person can see nearby objects clearly but not distant objects is called
nearsightedness
That a planet moves with different speeds in its orbit is given by which of Kepler's laws?
second
What type of galaxy is the Milky Way?
spiral
The longest day (daylight) of the year for the Northern Hemisphere occurs at the time of the winter solstice. autumnal equinox. vernal equinox. summer solstice.
summer solstice
The brightest object in the sky is
sun
Clusters containing clusters of galaxies are called _______________.
superclusters
Craters on the Moon are believed to have been caused by
the impact of meteorites
Which of the following radiations has the smallest wavelength? Visible Ultraviolet X-rays Infrared
X-rays
This type of energy depends on large natural changes in temperature
geothermal
A(n) _____ is any circle on the surface of a sphere whose center is at the center of the sphere.
great circle
If a wave has a frequency of 15 Hz, it has a period of
1/15 s
Rounding the number 200.601 to three significant figures goes
201
Daily rotation on an axis is known as the
Rotation
_________ is the only Moon in the solar system to have a dense atmosphere.
Titan
The angle between true north and the direction in which a compass needle points is called the angle of
declination
Ultrasound waves have frequencies equal to 20,000 Hz greater than 20,000 Hz less than 20,000 Hz
greater than 20,000 Hz
The Sun's energy is generated from the fusion of helium nuclei to form carbon nuclei. uranium to form lead, Pb. carbon nuclei to form magnesium nuclei. hydrogen nuclei to form helium nuclei.
hydrogen nuclei to form helium nuclei.
Twelve hours of daytime and twelve hours of nighttime occur at every location on Earth whenever the Sun reaches the celestial prime meridian. ecliptic. north or south celestial pole. vernal or autumnal equinox.
vernal or autumnal equinox.
The universe seems to be about how many years old?
14 billion
If a person weighs 108 lb on Earth, that person's weight on the Moon would be
18 lb
The study of astronomy involves energy. matter. all of these. space.
All of these
The temperature scale that has no negative readings is known as the _______ scale.
Kelvin
The cluster of galaxies that includes our Milky Way is called the _______________.
Local Group
An object travels in a circle of radius 2.0 m with a constant speed of 4.0 m/s. What is the direction of its acceleration? None of these Insufficient data given for determination Toward the center of the circle Tangential to the circle Normal to the plane of the circle
Towards the center of the circle
Magnetic domains normally occur in
iron
T/F Each section of the zodiac is identified by a prominent group of stars called constellations.
T
______________ is the only moon in the solar system to have retrograde motion.
Triton
Materials in which an electric charge flows readily are known as
electrical conductors
An electric iron uses 5 amps to heat it properly. If the resistance of the iron's heating element is 22 ohms, what should the source voltage be?
110 volts
Three resistors, 30 Ω, 20 Ω, and 60 Ω, are wired in series and connected to a 120-V battery. What is the equivalent resistance for this circuit?
110 Ω
The intensity of a 50-dB whistle is doubled. What is the new decibel level?
53 dB
If an object of mass 6 kg has an acceleration of 9 m/s2, what is the unbalanced force acting on it?
54N
Motion necessarily involves all of these a change in velocity. a change in speed. a change in position. a change in direction.
A change in position
A lens that is thicker at the edge than at the center is a converging lens only. both a convex lens and a converging lens. a diverging lens only. a convex lens only.
A diverging lens only
The law of reflection applies to all of these. specular reflection. diffuse reflection. irregular reflection.
All of these
The metric prefix that means one-hundredth (1/100) is kilo-. milli-. mega-. centi-.
Centi-
Which of the following is not directly involved in the second law of thermodynamics? Converting all heat input into work Entropy Conservation of energy Spontaneous heat flow
Conservation of energy
A projectile's horizontal velocity component (ignoring air resistance) changes most rapidly near the bottom of its trajectory. changes at a variable rate. changes at a constant rate. does not change.
Does not change
T/F Precession of earth's axis has a great influence on the seasons.
F
What happens to a sample of water when it is heated between 0°C and 4°C? Its volume is reduced. Its volume increases. Nothing changes except its temperature. It vaporizes.
Its volume is reduced
The ______ the wavelength compared to the size of the opening or object, the ______ the diffraction. larger; greater smaller; lesser
Larger; greater
Which of the following represents the longest distance? One light-year One astronomical unit One right ascension One parsec
One parsec
The full moon by definition occurs only once every month. for 7-3/8 days. for only a day. only for an instant.
Only for an instant
When looking at a fish underwater it does not appear where it actually is, this is due to?
Refraction
The standard unit of time in the mks system is the: second meter microsecond kilogram minute
Second
Entropy is associated with the Third Law of Thermodynamics Second Law of Thermodynamics First Law of Thermodynamics
Second Law of Thermodynamics
T/F For incidence greater than the critical angle the light is reflected internally.
T
T/F In the geocentric model of the solar system the Earth was at the center.
T
T/F Jet propulsion can be explained in terms of Newton's third law and the conservation of momentum.
T
T/F Only the equator is a "great circle".
T
T/F Sound waves (longitudinal waves) cannot be polarized.
T
T/F The Moon's Maria, or plains, are believed to have been caused by meteorite impact and then filled with volcanic lava.
T
T/F The Moon's surface experiences little or no erosion.
T
T/F The rings of Saturn are thought to be composed of ice and ice coated rocks.
T
T/F The speed of sound depends on the makeup of the particular medium that it is passing through.
T
Which of the following is an irregular galaxy? The Small Magellanic Cloud The Sagittarius Dwarf The Horsehead Nebula The Crab Nebula
The Small Magellanic Cloud
The parallel that corresponds to 23.5 degrees North is known as
Tropic of Cancer
In projectile motion, which of the following is not constant? Acceleration None of these Vertical velocity Horizontal velocity
Vertical velocity
The angular measure in degrees north or south of the celestial equator is called _______________.
declination
What is bought from an electric company?
electrical energy
The process by which electricity can be generated by using running or falling water is known as
hydroelectric generation
The apparent amount of time it takes for Earth to complete a rotation on its axis is called a
solar day
The flattened, rotating disk of gas and dust around the protosun, from which planets were believed to have formed, is called the
solar nebula
An object transported from Earth's surface to the surface of the Moon has: the same mass and the same weight. different mass and different weight. the same weight, but different mass. none of these. the same mass, but different weight.
the same mass, but different weight.
This type of interference occurs when different wavelengths interfere constructively and produce an array of colors.
thin film interference
The central, completely dark portion of a shadow is called the ____________.
umbra
When the Earth makes one complete orbit around the Sun, we call the elapsed time one
year
On March 21, the noonday Sun is overhead at what latitude?
0 degrees
A transformer with 600 turns on the primary coil is used to decrease the voltage from 3000 V to 120 V for home use. How many turns should be in the secondary coil?
24 turns
Waves in a lake are observed to be 5 m in length and to pass an anchored boat 1.25 seconds apart. The speed of the wave is?
4 m/s
Calculate the number of turns needed in the secondary winding of a transformer to transform a primary voltage of 300 volts down to a secondary voltage of 180 volts, if the primary winding has 1150 turns of wire.
690 turns
What is the power rating of a device that draws 0.8 A when connected to 120 V?
96 W
A faint white dwarf that temporarily increases in brightness as a consequence of nuclear explosions on its surface is termed
A nova
A Doppler red shift indicates that a light source is receding relative to the observer. all of these. a shift toward lower frequencies. a shift toward longer wavelengths.
All of these
Most cosmologists favor the Big Bang theory over other cosmological theories because of all of the above. a 3-to-1 ratio of hydrogen to helium in stars and interstellar matter. the cosmic microwave background. cosmological redshifts.
All of these
The Jovian planets have rings. are composed mainly of hydrogen and helium. all of these. have no solid surface
All of these
Which of the following is(are) found mainly between Mars and Jupiter? Asteroids Meteoroids Interplanetary dust Comets
Asteroids
Which of the following is not considered a major physical science: Physics Geology Astronomy Meteorology Biology
Biology
The photoreceptors responsible for color vision are called
Cones
Kepler's first law states that the orbits of the planets around the Sun are all lying in the same plane. none of these. circles. ellipses.
Ellipses
Which of the following is the largest dwarf planet? Mercury Pluto Ceres Eris
Eris
T/F Polaris will always be considered the "North Star".
F
When the absolute magnitudes, or brightnesses, of stars are plotted against their surface temperatures or colors, we obtain a(n)
Hertzsprung-Russell (or H-R) diagram.
A train sounding its horn is moving toward an observer. The pitch of the horn's sound relative to its normal pitch is the same. higher. sometimes higher and sometimes lower. lower.
Higher
Which of the Jovian planets has the most moons?
Jupiter
Light can travel to Earth from a distant star, but sound cannot. Why is this? Light is an electromagnetic wave, and sound requires a medium. The Sun does not make sound. Light is a longitudinal wave, and sound is a transverse wave. The statement is false; both light and sound can travel in empty space.
Light is an electromagnetic wave, and sound requires a medium.
Pulling a slinky back and forth is a good example of what kind of wave?
Longitudinal
The planet with the largest volcano in the solar system is
Mars
Which of the following has the most moons? Mercury Venus Earth Mars
Mars
Which of the following is not a dwarf planet? Ceres Eris Mercury Pluto
Mercury
Which planet was named by the early Greeks after the swift messenger of the gods.
Mercury
Which of the following is usually burned up in Earth's atmosphere? Asteroid Meteorite Meteor Meteoroid
Meteor
The points where the Moon's path crosses the ecliptic are called the __________.
Nodes
Los Angeles, California, is in the ______________ Standard Time zone.
Pacific
The portion of a shadow that is the semidarkness region is known as the ____________.
Penumbra
If a piece of ribbon were tied to a stretched string carrying a transverse wave, how would the ribbon be observed to oscillate? Parallel to the wave motion Both (A) and (B) Neither (A) nor (B) Perpendicular to the wave motion
Perpendicular to the wave motion
An imaginary line from one geographic pole to the other along the surface of Earth perpendicular to the equator, and that passes through Greenwich, England, is called
Prime Meridian
A concave mirror will produce real or virtual images. only inverted images. only virtual images. only real images.
Real or virtual images
Which of the following is not a terrestrial planet? Saturn Earth Venus Mars
Saturn
The elapsed time between wo successive crossings of the same meridian by a star other than the Sun (360 degrees) solar day. mean solar day. sidereal day. 24-hour day. meridian day.
Sidereal day
A ______________ is always longer than a ______________ . solar day; sidereal day sidereal day; solar day solar day; mean solar day mean solar day; solar day
Solar day; sidereal day
The Sun is a(n) planet. cluster. galaxy. star.
Star
The ______________ occurs on June 21. winter solstice vernal equinox autumnal equinox summer solstice
Summer solstice
The number of _______________ on the Sun varies over an 11-year cycle. sunspots rays canals valleys
Sunspots
T/F AM waves are more easily diffracted which leads to better reception of the AM bands in some cases.
T
T/F As a person grows older their lens becomes less deformable and they cannot focus as readily.
T
The third brightest object in the sky is
Venus
When drawing a ray diagram for a converging lens with an object that is inside the focal point a(n) __________ image is formed. inverted, real virtual, upright upright, real
Virtual, upright
When drawing a ray diagram for a converging lens with an object that is inside the focal point a(n) __________ image is formed. virtual, upright inverted, real upright, real
Virtual, upright
This type of solid lacks an ordered molecular structure
amorphous
An electromagnet consists of a bar magnet that carries an electric current an insulated coil of wire wrapped around a piece of iron coil of wire
an insulated coil of wire wrapped around a piece of iron
Resonance occurs when two different objects produce beats. an object having a certain natural frequency is set in vibration by a second object vibrating at that frequency. an object produces a sound. two different objects vibrate with different frequencies.
an object having a certain natural frequency is set in vibration by a second object vibrating at that frequency.
A lens that is thicker at the center than at the edge is both a convex lens and a converging lens. a converging lens only. a diverging lens only. a convex lens only.
both a convex lens and a converging lens.
Eighty-eight prominent groups of stars in the sky are called the _______________.
constellations
Heat transfer that involves mass movement is
convection
The change in the direction of a wave resulting from its encountering a small slit is known as
diffraction
A shock wave is produced when the speed of an object none of the answers are correct exceeds the speed of sound in air matches the speed sound in air is less than the speed of sound in air
exceeds the speed of sound in air
A visual defect wherein a person can see distant objects clearly but not nearby objects is called
farsightedness
When a material is found to have no definite volume and no definite shape, what is the phase of the material?
gas
The greater the mass of an object, the __________ its inertia.
greater
Kepler's third law of planetary motion is also known as the ______________ law.
harmonic
A freely falling object has a uniformly increasing velocity. is unaffected by gravity. has a uniformly increasing acceleration. has a uniformly increasing displacement.
has a uniformly increasing velocity.
What two reference points are thermometers calibrated.
ice point and steam point
The energy of a system increases when work is done on the system. always increases. increases when work is done by the system. always remains constant.
increases when work is done on the system.
Mass is a measure of
inertia
A sound with a frequency of 11 Hz is in the ______________ region of the sound spectrum.
infrasonic
Gas and dust distributed among the stars is known as the _______________
interstellar medium
Earth's magnetic field is always in the same direction. is always parallel to the planet's surface. is believed to arise from currents within the planet's core. results from a huge bar magnet within the planet.
is believed to arise from currents within the planet's core.
Mechanical energy is the sum of the energies of motion and position. necessarily involves gravitational potential energy. is always the total energy of a system. is always conserved.
is the sum of the energies of motion and position.
A standard unit is found only in the British system. is the same in all systems of units. is used for taking accurate measurements. may not be fixed in value. is found only in the metric system.
is used for taking accurate measurements.
The criteria for a solar system body to be a planet include all of the following EXCEPT: it must have a low density t must be the dominant body within its orbit it must have sufficient mass for self-gravity to form a nearly round shape it must be in orbit about the Sun
it must have a low density
The Moon's Maria are large, dark, flat areas of the Moon believed to be craters formed by meteorite impact that then filled with lava solid lava flows bodies of water like the Earth's oceans hardened sediment
large, dark, flat areas of the Moon believed to be craters formed by meteorite impact that then filled with lava
In a museum collection you can likely see a meteor but not a meteoroid meteorite but not a meteoroid meteoroid but not a meteorite
meteorite but not a meteoroid
The Earth has a shape of a(n) ____________.
oblate spheroid
The apparent motion of an object when it is viewed from two different positions against a fixed background is called
parallax
Work is defined as force times
parallel distance
Wave frequency is inversely proportional to
period
The Doppler effect is true only for sound waves. perpendicular to the direction of the wave velocity. both parallel and perpendicular to the direction of the wave velocity. parallel to the direction of the wave velocity. in all directions.
perpendicular to the direction of the wave velocity.
What is the visible surface of the Sun called?
photosphere
The slow, 25,800 year rotation of Earth's axis is called _________.
precession
The purpose of the third prong on a common electric plug for an appliance is to
provide grounding
Pulverized rock is believed to make up the Moon's
rays
The majority of stars are small, cool, type-M stars called
red dwarfs
The ratio of the speed of light in a vacuum to the speed of light in a medium is known as the index of
refraction
Stellar paralax proves that Earth is
revolving
The four seasons—spring, summer, fall, and winter—are caused by the Sun's changing its daily altitude over a period of 1 year. The Sun's altitude changes simply because Earth rotates on its axis. simply because Earth's axis is tilted 23.5° from the normal to the ecliptic plane. simply because Earth revolves westward about the Sun.
simply because Earth's axis is tilted 23.5° from the normal to the ecliptic plane.
Nebular theory pertains to the formation of
solar system
The Sun projects charged particles into space, giving rise to a flow of radiation called the
solar wind
The farthest point of the Sun from the equator is known as the
solstice
Other planetary systems are best detected by the Doppler shifts that change the pattern of the star's
spectrum
Tides are caused by Earth's rotation. the gravitational pull of the Moon and the Sun. none of these. the Moon keeping the same face toward Earth.
the gravitational pull of the Moon and the Sun.
A child with a mass of 25 kg is riding on a merry-go-round. If the child has a speed of 3 m/s and is located 2 m from the center of the merry-go-round, what is the child's angular momentum?
150 kg·m^2/s
When a moving object's velocity doubles, its kinetic energy increases by a factor of __________.
4
A mango of 2.0 kg of mass free falls from a height of 3 m above the ground. What is the gravitational potential energy of the mango at its initial position?
58.8 J
A bicycle of 40 kg travels with a kinetic energy of 720 J. Determine the speed of the bicycle?
6 m/s
What is the final velocity of a car that accelerated 10 m/s2 from rest and traveled 180m?
60 m/s
An object has kinetic energy of 324 J. If its speed is 9 m/s, what is its mass?
8
The constant G that appears in the equation F = Gm1m2/r2 is a universal constant. smaller on the Moon than on Earth. equal to g. the force of gravity. the acceleration due to gravity.
A universal constant
T/F Acceleration due to gravity is independent of the mass.
T
T/F Evaporation occurs more quickly in dry climates than in humid climates.
T
T/F If an object has a constant velocity, then its acceleration is zero.
T
A car is moving down a freeway in a straight line at a constant rate of 32.0 m/s for 3.0 s. Its acceleration is
Zero
Centripetal means
center seeking
The energy of motion is called
kinetic energy
Currently, in the United States, which fuel has the largest consumption?
oil
What must be exerted on an object to change the angular momentum?
torque
How much heat is necessary to change 30 g of water at 10°C into water at 80°C? Specific Heat of water is 1.00 kcal/kgoC
2.1 kcal
A golfer sinks a putt 3 seconds after the ball leaves the club face. If the ball traveled with an average speed of 0.8 m/s, how long was the putt?
2.4
What is 281 x 10e2 in scientific notation?
2.81 x 10e4
An object falls freely from rest on a planet where the acceleration due to gravity is twice as much as it is on Earth. In the first 5 seconds it falls a distance of
245 meters
A temperature of degrees 5 Fahrenheit is equivalent to _____ Kelvin.
258.2
A circular hole is drilled into an aluminum sheet. When the sheet is heated, the diameter of the hole will not be affected. become larger. become smaller. depend on the thickness of the sheet.
Become larger
A car accelerates at 2 m/s2. Assuming the car starts from rest, how much time does it need to reach a speed of 20 m/s?
10 seconds
A car starts from a speed of 10 m/s with an acceleration of 2 m/s2. The time needed for the car to reach 30 m/s is.
10s
The insulation in walls uses which of the following methods to prevent heat transfer? All of these Radiation Convection Conduction Conduction and convection
Conduction and convection
A heat engine converts heat to internal energy. converts heat to work. transfers heat from a low-temperature reservoir. converts work to heat.
Converts heat to work
In this type of solid the molecules are arranged in a particular repeating pattern. Amorphous Crystallin
Crystallin
T/F An object or system that possesses energy does not have the ability to do work.
F
The _____ the specific heat of a substance, the ________ is the amount of heat required to raise the temperature of a unit of mass. lower; greater lower; lower greater; greater greater; lower
Greater; greater
A very tentative explanation of observations of some regularity of nature is a(n)
Hypothesis
"Weightlessness" occurs when an object Loses weight. is in free fall. is midway between Earth and the Moon. has zero acceleration.
Is in free fall
Which of the following would be the same for a person on the Moon and on Earth? Gravitational acceleration Maximum jumping height Weight The amount of time for an object to fall 2 meters from rest Mass
Mass
Density describes weight per mass. length per unit time. mass per unit volume. volume per liter.
Mass per unit volume
This type of friction occurs when the frictional force is sufficient to prevent relative motion between surfaces.
Static
When a material is found to have a definite volume but no definite shape, and when it assumes the shape of the container in which it is placed, what is the phase of the material?
liquid
In an equation, the symbol m generally stands for
mass
When multiplying and/or dividing quantities, you should report: all the digits that show on your calculator the result rounded to the same number of digits as there are in the quantity with the greatest number of significant figures. the result rounded to the same number of digits as there are in the quantity with the least number of significant figures. only whole numbers.
the result rounded to the same number of digits as there are in the quantity with the greatest number of significant figures.
When the measured quantity 45.67 kg is divided by the measured quantity 3.42 L, the answer should have how many significant figures?
3
The speed of light in a vacuum is 300,000,000 m/s. Represented in powers-of-10 notation, this is:
3 x 10e8 m/s
A student weighing 200 N climbs a flight of stairs 9.0 m high in 4 s. What power is required to perform this task?
450 W
A temperature of degrees 250 Celsius is equivalent to _____ degrees Fahrenheit.
482
Convert 3.00 x 10e8 meters/sec to miles/hours
6.71 x 10e8 miles/hours
T/F An object will remain at rest or in uniform motion in a straight line unless acted on by an external balanced force.
F
T/F If the decimal point is shifted to the right in a number expressed in powers-of-10 notation, the exponent, or power of 10, is increased.
F
A hydrometer is used to measure:
Liquid density
T/F The buoyant force depends on the weight of the fluid displaced.
T
T/F Work is done when there is a change in position.
T
T/F Work only occurs if there is movement.
T
The rate at which an object's velocity changes with time is called its
acceleration
A mass is accelerated when ______________ acts upon the mass. no force an unbalanced force a balanced force none of these any force
an unbalanced force
Newton's third law of motion states that the force pair acting on different objects consists of two forces that are equal and in the same direction. are under the influence of gravity. always produce an acceleration. are equal and in opposite directions.
are equal and in opposite directions.
Currently, in the United States, which fuel is utilized to produce the majority of electrical power?
coal
An object that is moving in a linear path with an acceleration in the direction opposite to the motion has a(n) ______________ velocity.
decreasing
Average speed multiplied by time gives
distance
An object will ______________ in a fluid if its average density is ______________ the density of the fluid. sink; less than sink; greater than float; twice float; equal to
sink; greater than
