Answers by visitors named: as

What type of a social scientist would research "where does the most crime happen in the world"?

17 years ago

2/3 cups of milk are required for 6 pancakes. a. How much milk is needed to make 1 pancake?

9 years ago

(2**) ***- Enter 2 missing digits at index 4 from end _ _ 21

9 years ago

A double-slit experiment uses coherent light of wavelength 633 nm with a slit separation of 0.100 mm and a screen placed 2.0 m away.

8 years ago

when is the instantaneous rate of change of f(x) = 0.5 (2x)whose graph is shown below, equal to zero?

3 years ago

Scary Harry's has identified that the cost of a new computer will be $48,000, but with the use of the new computer, net income will increase by $5,000 a year. If depreciation expense is $3,000 a year, the cash payback period is: Can somebody explain what...

2 years ago

Rodrigo designed an airtight and watertight pouch. He put a carefully measured amount of a chemical called ammonium chloride in it. Then, he added a measured amount of water to the ammonium chloride, sealed the pouch tightly, and wrapped the pouch around...

1 year ago

The table below shows the varying distances between pairs of atoms with the same electric charge and magnitude. Pair of Atoms Distance Between the Atoms (units) A 16 B 24 C 11 D 29 Which of the following pairs of atoms has the strongest electric force? A....

1 year ago

The diagram below shows a substance undergoing a phase change. The substance is changing from a solid to a liquid. Which of the following is true? A. The particles in the liquid are moving slower than they were in the solid. B. The particles in the liquid...

1 year ago

The diagram below shows a wave with its wavelength indicated in red. Which of the following would happen if the wavelength of this wave was reduced by half? A. The frequency of the wave would increase. B. The amplitude of the wave would decrease. C. The a...

1 year ago

A metal block is sliding along an infinite, frictionless, horizontal plane. There are only two forces acting on the metal block: gravity and an upward force from the plane. Which of the following best describes the metal block's motion? A. Gravity will ac...

1 year ago

The diagram below shows sound waves hitting the surface of a body of water and bouncing back off. Which of the following best describes this type of wave behavior? A. transmission B. reflection C. refraction D. absorption

1 year ago

Gavin learns in science class that small objects such as meteoroids and debris can move through space at such high speeds that they can damage or puncture the sides of space vehicles. He decides to design an experiment based on this information. Gavin use...

1 year ago

Which of the following statements correctly describes a difference between mechanical waves and electromagnetic waves? A. Mechanical waves require a medium to travel through, whereas electromagnetic waves can travel through empty space. B. Mechanical wave...

1 year ago

Four objects are orbiting a star along the same path. The objects are at the same distance from the star, and their masses are shown in the following image. The gravitational force of attraction is strongest between the star and object _______. A. Z B. Y...

1 year ago

The image below shows models that represent the reactants and products of a chemical reaction. Reactants Products Based on the above image, which of the following is true? A. Mass could have either been gained or lost during this chemical reaction because...

1 year ago

A teacher sets up two identical beakers of water in science class. The teacher heats both beakers. She adds more energy to beaker X than to beaker Y by heating it for a longer time. Which statement is true about the the water particles in the two beakers...

1 year ago

Two solar powered toy cars are shown below. Car A has a mass of 0.245 kg and travels at a speed of 10 cm/s. Car B has a mass of 0.245 kg and travels at a speed of 20 cm/s. Which of the following correctly describes the kinetic energy of the cars? A. Car B...

1 year ago

The diagram below shows a wave. Which of the following would definitely increase the energy of the wave? A. increasing the wavelength of the wave B. decreasing the amplitude of the wave C. increasing the amplitude of the wave D. decreasing the frequency o...

1 year ago

Which of the following statements correctly describes a difference between mechanical waves and electromagnetic waves? A. Electromagnetic waves transfer energy, whereas mechanical waves only transfer matter. B. Mechanical waves require a medium to travel...

1 year ago

The diagram below shows a substance undergoing a phase change. The substance is changing from a solid to a liquid. Which of the following is true? A. The particles in the liquid are fixed and unable to move at all. B. The particles in the liquid are movin...

1 year ago

Ike conducted a scientific experiment involving clear adhesive tape. He removed two strips from a roll of adhesive tape. Then, he pressed each strip of tape, sticky-side down, on two different surfaces. He quickly removed each strip of tape from the surfa...

1 year ago

Susan was traveling in an airplane. She looked out of a window in the airplane and saw clouds in the sky. Why could Susan see clouds through the window of the airplane? A. Most of the light hitting the window was refracted when it passed through the windo...

1 year ago

Models of three chemical structures are shown below. Which statement about the models is true? A. X represents an atom, Y represents an extended structure, and Z represents a molecule. B. X represents a molecule, Y represents an extended structure, and Z...

1 year ago

Alice builds an electric motor by positioning an electromagnet between the poles of a permanent magnet. The electromagnet spins as the current running through it repeatedly switches directions. How could Alice decrease the force that the permanent magnet...

1 year ago

3 The diagram below shows a substance undergoing a phase change. The substance is changing from a solid to a liquid. Which of the following is true? A. The particles in the liquid are moving slower than they were in the solid. B. The particles in the liqu...

1 year ago

A student is conducting an investigation on energy transfer. She places three hot objects of the same mass into equal masses and temperatures of cold water. She then measures the final temperature of each object. The data is shown below. Substance Mass (g...

1 year ago

The diagrams below represent the atoms or molecules that make up four different substances. Which of the following is true? A. Hydrogen gas and argon gas are both made up of individual atoms that are not bonded together. B. Liquid water and carbon dioxide...

1 year ago

The diagram below illustrates the total amount of energy that reaches Earth from the Sun and how this energy is distributed. Which part of this system is most greatly impacted when human activities release excessive amounts of carbon dioxide and other gre...

1 year ago

The diagram below shows the basic materials and processes involved in the rock cycle. Which of the following processes is occurring when magma cools to form solid rock? A. melting B. crystallization C. weathering D. compaction

1 year ago

The diagram below shows the basic materials and processes involved in the rock cycle. Based on the diagram, which of the following is true? A. All three types of rock can be weathered to form sediment. B. Only sedimentary rock can undergo heat and pressur...

1 year ago

The diagram below shows the development of a warm front. Modified from image courtesy of NWS/NOAA Which of the following best describes what is happening in the diagram? A. A cold air mass is pushing into a warm air mass that is behind another cold air ma...

1 year ago

A student went outside every night for eight nights to look at the Moon. The pictures below show how the Moon looked each night. Images courtesy of NASA What caused the changes in the appearance of the Moon that the student observed? A. the revolution of...

1 year ago

Which of these processes takes place over the largest scale in terms of size? A. formation of ocean basins B. formation of valleys C. formation of potholes D. formation of sand dunes

1 year ago

Shale is a relatively impermeable type of rock, while sandstone is permeable to water. In some areas, the ground is made of mostly sandstone with a layer of shale deep underground. Groundwater can seep into the layers of sandstone and be stored above the...

1 year ago

The following maps show the severity of droughts across the United States in September of 2007 and the locations of wildfires in the United States throughout that same year. The maps show that the chance of wildfires increases as drought increases. Which...

1 year ago

An engineer has created a new design for the pipe systems in homes. In this design, pipes are joined together with flexible connectors that will protect against movement of the pipes. This new pipe system can be used for water, gas, and sewer lines. The e...

1 year ago

Most scientists agree that all of today's continents were part of a single continent known as Pangaea around 250 million years ago. The map below shows the theorized positions of some of these continents at that time. Which of the following would best pro...

1 year ago

The image above shows a _______, which is an icy body that orbits the Sun in a highly elliptical path. A. comet B. meteor C. asteroid D. planet

1 year ago

The diagram below shows the basic materials and processes involved in the rock cycle. Based on the diagram, which of the following is true? A. Only sedimentary rock can undergo heat and pressure to form metamorphic rock. B. All three types of rock can be...

1 year ago

The image below shows a mid-ocean ridge. Image courtesy of NASA GSFC How are the sections of oceanic crust on either side of the ridge moving? A. They are pushing into each other. B. One is slipping under the other. C. They are moving away from each other...

1 year ago

The diagram below shows the basic materials and processes involved in the rock cycle. Which of the following processes is occurring when magma cools to form solid rock? A. compaction B. weathering C. melting D. crystallization

1 year ago

The picture below shows a solar eclipse as seen from Earth. How must the Sun, Earth, and Moon be positioned to produce the solar eclipse? A. The Earth must be between the Sun and the Moon. B. The Sun must be between the Earth and the Moon. C. The Moon mus...

1 year ago

The diagram below illustrates the major steps of the water cycle. Which of the following steps occurs as heat from the Sun causes liquid water to change into a gas? A. evaporation B. surface runoff C. precipitation D. condensation

1 year ago

The diagram below illustrates the major stages of the water cycle. Which of the following mainly drives surface runoff? A. electricity B. magnetism C. gravity D. thermal energy

1 year ago

19 The diagram below represents a series of rock layers. Each different type of shape shown in the layers represents a fossil of a different species. For example, the yellow triangles represent one species while the green squares represent another. The la...

1 year ago

The diagram below shows the geologic time scale, which separates Earth's history into different eons, eras, periods, and epochs. A scientist is studying a rock layer that predominantly contains fossils of very large reptiles. A few small mammals and birds...

1 year ago

For a science project, John wants to build a model of the Solar System that is roughly to scale. For the Earth, he uses a shot put that is 13 cm wide. For the Moon, he uses a table tennis ball that is 4 cm wide. Which object would best represent the Sun?...

1 year ago

The diagram below shows the development of a warm front. Modified from image courtesy of NWS/NOAA Which of the following best describes what is happening in the diagram? A. A cold air mass is pushing into a warm air mass that is behind another cold air ma...

1 year ago

A student built a model to show a scientific process. A picture of her model is shown below. a large ball in the middle of a rubber sheet, and small marble rolling toward it Modified from image courtesy of NASA What is the student most likely trying to sh...

1 year ago

26 The weather map below shows a low pressure system in the northeast and a high pressure system in the northwest moving toward each other. What is mostly likely to occur when the two systems collide at the location marked with an X? A. dry air and wind f...

1 year ago

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