Questions and answers by

mir

Questions (269)

the gases in the atmosphere tht trap heat produce
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nutrient poor soil biome
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cold year round biome
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warm summrs cool winters biome
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warm year round biome
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nutrient rich soil biome
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nutrient rich soil
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low precipitation biome
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seasonal precipitation biome
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year round precipitation biome
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write a recursive formula for an the nth term of the sequence 5,3,1,-1
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write a recursive formula for an the nth term of the sequence 5,3,1,-1 a1= an=
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write a recursive formula for an the nth term of the sequence 15,17,19,21 a1= an=
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write a recursive formula for an, the nth term of the sequence 20,25,30,35 a1= an=
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write a rescursive formula for an, the nth term of the sequence 1,-6,-13,-20 a1= an=
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write a rescursive formula for an, the nth term of the sequence 1,-6,-13,-20
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if a1 =5 an an =5an-1 then whats the value of a4
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if a1=3 and an = an-1 + 2 then find the value of a5
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if a1=10 and an = an-1+1 then find the value of a5
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if a1=6 and an=an-1-5 find the value of a5
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Compare the economic hardships of the Great Depression with today’s economical struggles
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which transformation carries the parallelogram onto itsself
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illustration of harpers weekly magazine What social changes have occurred during this period?
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What social changes have occurred during this period?
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From the illustrator’s point of view, what economic changes have occurred between 1861 and1882?
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What is the moral of the story that Booker T. Washington tells the audience in his speech?
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Does the farmer believe that the New South is working to improve his life?
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What does Grady predict these changes will bring to improve the South?
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Which is an advantage of machines?They increase the amount of work that is done. They decrease the distance over which one
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Which of these properties describes a diode?able to change alternating current into direct current able to switch an electric
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Use the diagram to answer the question .Which statement describes the energy at letter E in the diagram above? Kinetic energy is
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In general, metals _____.are stored in sealed containers for safety are highly reactive substances show a wide range of chemical
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If one knows how fast work is done, what can one calculate?energy distance power force
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The surface of water can act like a sort of skin due to a property of liquids called _____.surface tension condensation
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A varying electric current that represents information is called a(n) _____.electronic signal integrated circuit electromagnetic
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When did Democritus propose the idea of atoms?after 1900 A.D. about 430 B.C. about 430 A.D. before 500 B.C.
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How are first-class levers different from third-class levers?First-class levers do not change the direction of the force.
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Use the diagram to answer the question .Energy of Two Reactions In the diagram above, which reaction is an endothermic reaction?
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Which part of a solution has been dissolved by the solvent?solute mixture precipitate colloid
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Which could be considered an inclined plane wrapped around a cylinder?lever wheel and axle pulley screw
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What is electromagnetism?the combination of batteries with magnets the relationship between electricity and magnetism a type of
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When are larger atoms least likely to be reactive?When they have no valence electrons. When they have 2 valence electrons. When
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2. 125 views
Because TVs require more voltage than is found in normal household current, what is built into them?secondary generators step-up
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What is the total potential and kinetic energy of the particles in an object?its mechanical energy its thermal energy its
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What characteristic do photosynthesis and combustion share?They both are endothermic. They both start with chemical energy. They
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2. 128 views
Magnets have two poles. What is true about these poles?The magnetic force is weakest at the south pole. The opposite poles on
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H 2 O, CO 2 , and C 12 H 22 O 11 are all examples of chemical _____.formulas bonds changes properties
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Every atom of an element has the same _____.weight mass number of protons number of neutrons
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All of the halogens are _____ to humans.poorly reactive, but dangerous poorly reactive and not dangerous very reactive, but not
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Use the diagram to answer the question .What physical process is reduced by the device shown? conduction insulation radiation
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What is shown in the figure above?a single magnetic field between opposite poles a combined magnetic field between like poles a
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Magnesium bromide is an ionic compound with the chemical formula MgBr 2 . What does the “2” indicate?There are two magnesium
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Which is larger than a single atom?electron proton magnetic domain neutron cloud
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Why is the International System of Units (SI) used by scientists all over the world?It was developed in the United States. It is
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Which of these is easy to separate into its different parts?atom molecule compound mixture
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The opposite of vaporization is _____.evaporation freezing condensation sublimation
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What are the fewest number of reactants a chemical equation can have?two zero one four
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What is required to change water from a liquid to a gas?the addition of energy a reduction of the volume of the sample a
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What type of device is a battery?a voltage source a motor a magnet an electric circuit
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Use the diagram to answer the question .What type of reaction is occurring in the candle above? Only an exothermic reaction.
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What is Newton’s second law of motion?Force equals mass divided by acceleration. Acceleration equals force divided by mass.
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The arrangement of carbon atoms in _____ resembles the pattern on a soccer ball.a fullerene graphite a nanotube a pencil
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How can the solubility of a solution be increased?By increasing the temperature. By decreasing the amount of solvent added. By
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Which hard drive would store the most information?4 gigabytes 4 kilobytes 2 terabytes 6 nanobytes
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Nonmetals are generally _____.not common elements on the left side of the periodic table good conductors of electricity poor
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What is the temperature at which a solid melts?a physical property a chemical change a physical change a chemical property
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In the periodic table, where are the most reactive metals found?In Periods 6 and 7 at the bottom. In Group 1, the first column
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How does an AC generator compare to an electric motor?Electric motors power AC generators. They are the same. They use different
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What is the first step a programmer takes in creating software?testing the program for bugs writing the instructions for the
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Which of the following statements is a part of John Dalton’s atomic theory?Electrons move in specific orbits around the
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How does an individual figure the total force exerted on an object by two forces acting in opposite directions?Divide the
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When did Mendeleev publish his first periodic table?1913 1776 1869 1949
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Which process causes the handle of a spoon in a bowl of soup to become warm?boiling melting combustion conduction
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What is the number placed below an element’s symbol in a chemical formula called?a subscript a coefficient a product a
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What is one difference between a galvanometer and an electric motor?An electric motor uses electrical energy to spin. A
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The moon accelerates because it is _____.in a vacuum in space continuously increasing its speed of orbit constantly increasing
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Most of an atom’s volume is found _____.between the protons and neutrons in the protons and neutrons in the electron cloud in
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2. 105 views
When you chew your food to break down the larger pieces into smaller particles, how are you helping to increase the rate of the
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Where did the term “laser” come from?the company that created the first laser: “Lazarus Energy Research” the phrase
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Use the diagram to answer the question.Referring to the figure, what type of image would this lens form? a real image an
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Why are distant galaxies and stars so hard to see?because they are so small, they must be magnified because they are so large,
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What are long, thin strands of glass that carry light for long distances?optical fibers lasers holograms optical wires
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Which is a curved piece of glass or other transparent material used to refract light?a concave lens an optical fiber a reflector
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How are lasers used to record information on a compact disc?The laser creates magnetic stripes on the disc in a pattern. The
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What is the image of a distant object caused by refraction of light?prism hologram mirage rainbow
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Which type of light does a flashlight produce?incoherent cold light white light coherent
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What type of image does a concave lens produce?no image only a virtual image both real and virtual images only a real image
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What type of lens is thicker in the center than at the edges?a reflecting lens a virtual lens a concave lens a convex lens
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Why doesn’t any light escape from the sides of an optical fiber?because the angle of incidence is so small because the angle
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What angle of incidence is required for total internal reflection?a small angle a large angle a 90° angle a 180° angle
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How can signals be sent through optical fibers?by changing the color of light by changing the frequency by sending pulses of
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What happens when light passes from air into water?The light forms a mirage. The light speeds up. The light slows down. The
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How are laser beams that are used as signals usually sent from transmitter to receiver?through optical fibers through the air
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2. 150 views
When were the rings of Saturn and the moons of Jupiter first seen?about 200 years ago, in the mid 1800s about 1,000 years ago,
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What causes a mirage?a refraction of light as it as passes through layers of air at different temperatures a refraction of light
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What are the two main types of telescopes?refracting and reflecting refracting and radio X-ray and radio radio and reflecting
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Why do doctors use lasers to repair detached retinas?to change their shape to prevent blindness to prevent internal bleeding to
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What is the bending of light rays as they enter a new medium?refraction diffuse reflection regular reflection diffraction
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In a microscope, where is the specimen placed?close to the objective close to the convex mirror close to the eyepiece close to
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2. 156 views
What is the most common use of telescopes?to study objects in space to look at tiny nearby objects to focus the light from the
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2. 104 views