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Kathy
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Category: Homework
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Experience:  Elementary teacher for 16 years Bilingual Spanish English and with a Psychology Masters
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The earth is approximately, though not perfectly, spherical

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The earth is approximately, though not perfectly, spherical because
A) gravity tends to squeeze any planet into a spherical shape, causing bumps and depressions, such as mountains and ocean basins, to smooth out.
B) constant tidal changes pushing the earth one way and then another even it out into a sphere
C) the spinning of earth naturally drives it into a sphere, otherwise it might well be elliptical in shape.
D) a spherical earth encounters less friction as it orbits around the sun.
2. Tides occur because
A) the moon, and to a lesser extent the sun, attract different parts of the earth to different extents at different times
B) the moon is unstable and continuously "falling" toward the earth
C) the spinning of the earth causes water to slosh in the basins of the oceans
D) Mercury and Venus daily modulate the gravitational field of the sun reaching the earth
3. Ignoring air resistance, a bullet fired horizontally has how many forces acting on it after leaving the rifle?
A) One, from the gunpowder explosion
B) One, from the pull of gravity
C) Two, one from the gunpowder explosion and one from gravity
D) Three, one from the gunpowder explosion, one from gravity, and one from the motion of the bullet
4. In which of the following examples is the motion of the car accelerated?
A) A car travels on a straight, flat road at the constant speed of 40 km/h.
B) A car climbs a steep hill with its speed dropping from 18 km/h at the bottom to 9 km/h at the top
C) A car climbs a steep hill at the constant speed of 70 km/h.
D) A car rolls backwards down a steep hill at a constant speed of 70 km/h.
5. The law of conservation of energy is a statement that
A) energy must be conserved and you are breaking a law if you waste energy
B) the supply of energy is limited so we must conserve it
C) the total amount of energy is constant
D) energy cannot be used faster than it is created
6. When you do work on something, you
A) leave it with less energy than it had before
B) move it in a direction 90° to the direction of the applied force
C) give it energy
D) none of these.
7. A light bulb rated at 100 W does not mention a time factor because the time is
A) not used in power ratings of light bulbs
B) already included in the definition of a watt
C) considered in energy consideration other than light bulbs.
D) not important because bulbs always use the same amount of energy
8. The wound spring of a watch possesses _______________ energy.
A) potential
B) kinetic
C) chemical
D) zero
9. Which of the following requires the most land area to satisfy the energy requirements of a medium size city?
A) Growing crops for conversion to fuel
B) Solar collectors
C) Wind turbines
D) Nuclear power
10. Geothermal energy
A) is an ancient technology that has fallen out of favor in recent years
B) is currently used in several dozen countries and accounts for nearly 4% of the world's energy production
C) cannot be applied in regions, such as Iceland, near tectonic plate boundaries because the underground temperature increase is too high and pipes set in the bedrock tend to buckle and melt.
D) is based on the principle that temperature increases with depth below Earth's surface, and furthermore, in some areas naturally occurring hot water can be extracted as an energy source.
11. The type of heat transfer called radiation
A) takes place as heat energy is carried from one place to another by molecular collisions.
B) does not require the presence of matter
C) involves the motion of a volume of hot fluid
D) occurs when a solid changes into its vapor state without first becoming a liquid
12. Compared to cooler air, warm air can
A) hold more water vapor
B) less water vapor
C) be the same amount of water vapor
D) depend on the exact temperature at the time
13. A temperature of 100°C is equal to what temperature on the fahrenheit scale?
A) 0°
B) -273°
C) 212°
D) 32°
14. If you divide voltage by resistance, the answer will be in units of
A) coulombs.
B) ohms.
C) amperes
D) watts
15. Which of the following is most likely to acquire an electrostatic charge?
A) Objects that are electrical conductors
B) Objects that are electrical nonconductors
C) Conductors and nonconductors are equally likely to acquire electrostatic charges
D) Objects that are grounded
16. Two current carrying wires are placed parallel to each other. The force between the two wires
A) is zero.
B) is attractive
C) is repulsive
D) can be attractive or repulsive depending on the direction of the current in the wires.
17. In a conducting material, such as a piece of copper wire,
A) some of the electrons are free to move readily
B) all of the electrons are free to move readily
C) all of the protons are free to move readily
D) both electrons and protons move readily.
18. In a transverse wave
A) particles move back and forth, forming a series of compressions and rarefactions
B) particles do not move, they only vibrate
Submitted: 2 years ago.
Category: Homework
Expert:  Kathy replied 2 years ago.
I am working on your questions. Thanks
Customer: replied 2 years ago.
thank you
Expert:  Kathy replied 2 years ago.
Below are your answers. I hope they help. Thanks


The earth is approximately, though not perfectly, spherical because
A) gravity tends to squeeze any planet into a spherical shape, causing bumps and depressions, such as mountains and ocean basins, to smooth out.
2. Tides occur because
A) the moon, and to a lesser extent the sun, attract different parts of the earth to different extents at different times
3. Ignoring air resistance, a bullet fired horizontally has how many forces acting on it after leaving the rifle?
B) One, from the pull of gravity
4. In which of the following examples is the motion of the car accelerated?
B) A car climbs a steep hill with its speed dropping from 18 km/h at the bottom to 9 km/h at the top
5. The law of conservation of energy is a statement that
C) the total amount of energy is constant
6. When you do work on something, you
C) give it energy
7. A light bulb rated at 100 W does not mention a time factor because the time is
B) already included in the definition of a watt
8. The wound spring of a watch possesses _______________ energy.
A) potential
9. Which of the following requires the most land area to satisfy the energy requirements of a medium size city?
A) Growing crops for conversion to fuel
10. Geothermal energy
D) is based on the principle that temperature increases with depth below Earth's surface, and furthermore, in some areas naturally occurring hot water can be extracted as an energy source.
11. The type of heat transfer called radiation
B) does not require the presence of matter
12. Compared to cooler air, warm air can
A) hold more water vapor
13. A temperature of 100°C is equal to what temperature on the fahrenheit scale?
C) 212°
14. If you divide voltage by resistance, the answer will be in units of
C) amperes
15. Which of the following is most likely to acquire an electrostatic charge?
B) Objects that are electrical nonconductors
16. Two current carrying wires are placed parallel to each other. The force between the two wires
D) can be attractive or repulsive depending on the direction of the current in the wires.
17. In a conducting material, such as a piece of copper wire,
A) some of the electrons are free to move readily
18. In a transverse wave
particles move perpendicular to the direction of the wave.
Kathy, Teacher
Category: Homework
Satisfied Customers: 3129
Experience: Elementary teacher for 16 years Bilingual Spanish English and with a Psychology Masters
Kathy and 7 other Homework Specialists are ready to help you
Customer: replied 2 years ago.

where you going to answer the rest

 

18. In a transverse waveA) particles move back and forth, forming a series of compressions and rarefactions
B) particles do not move, they only vibrate
C) particles move perpendicular to the direction of the wave.
D) the solid portion of the medium moves perpendicular to the liquid portion
19. Radio waves and x-rays are examples ofA) electromagnetic waves
B) mechanical waves
C) pressure waves
D) longitudinal waves
20. The speed of sound wavesA) is faster through the air than liquids
B) is faster in solids than liquids
C) determines the type of sound, such as infrasound (very fast) or ultrasound (very slow).
D) is purposefully modulated in the technique of sonar detection
21. The doppler effect refers to changes in waveA) amplitude
B) speed.
C) frequency
D) all of the above
22. Isotope A has a half-life measured in minutes, whereas isotope B has a half-life of millions of years. Which is more radioactive?A) isotope A
B) isotope B
C) Both are equally dangerous
D) It depends on the sample size
23. Rutherford's experiment revealed thatA) atoms are mostly empty space
B) all atoms have the same atomic number
C) quarks are the building blocks of protons and neutrons
D) atoms are electrically neutral
24. Which atom is an isotope of 84Be?A) 85Be
B) 74Be
C) 84He
D) 84Li
25. In a neutral atomA) the number of protons equals the number of neutrons
B) the number of neutrons equals the number of electrons
C) the number of electrons equals the number of protons
D) the number of protons is zero
26. The atomic number of an atom identifies the number ofA) protons
B) neutrons.
C) quantum orbits
D) excited states
27. Isotopes are atoms of an element with identical chemical properties but with differentA) numbers of protons
B) masses
C) numbers of electrons
D) atomic numbers
28. The modern periodic law is based onA) atomic number
B) atomic mass
C) atomic weight
D) chemical activity
29. If you mix sugar and cinnamon together, you haveA) an element
B) a compound
C) a homogenous mixture
D) a heterogeneous mixture
30. Chemical energy is stored within molecules asA) thermal energy
B) internal activation energy
C) internal potential energy
D) kinetic energy of the nucleus
31. Ionic bonds are formed whenA) electrons are transferred from the excited to the ground state.
B) electrons are transferred from the ground state to the excited state
C) electrons are transferred between atoms
D) atoms share electrons
32. A compound is usually relatively stable ifA) its decomposition is weakly exothermic
B) it liberates energy when decomposed
C) a great deal of energy is needed to decompose the compound
D) the PE of its electrons is high
33. Catalysts used by living organisms to regulate their chemical processes are calledA) hormones
B) steroids
C) enzymes.
D) lipids.
34. The interaction between ultraviolet light and ozone that protects life on the surface takes place in theA) troposphere.
B) stratosphere.
C) exosphere
D) ozonosphere.
35. A warm front forms whenA) a cold air mass displaces warmer air
B) masses of cold air and warm air move past one another in opposite directions
C) the suns warms a stationary cold air mass
D) a warm air mass advances over a mass of cooler air.
36. Longer periods of drizzle, rain or snow are usually associated with which cloud type?A) stratus
B) cumulus
C) cirrus
D) None of these are correct.
37. A current that moves northeastward across the Atlantic is called theA) Labrador current
B) Gulf Stream
C) California current
D) equatorial current
38. The most abundant mineral in the mantle is probablyA) feldspar.
B) quartz.
C) clay minerals
D) olivine.
39. Which of the following contribute to the core of the earth being hot?A) The heating caused by the gravitational collapse of the planet 4.5 billion years ago
B) Radioactive isotopes
C) Both of these are correct
D) Neither of these is correct
40. According to the rock cycleA) most rocks are virtually indestructible
B) magma can only form from melted sedimentary rocks
C) sedimentary rocks can be transformed into metamorphic rocks
D) sedimentary rocks are more easily eroded than igneous and metamorphic rocks
41. Folding in rocksA) tends to occur in a series of sudden displacements
B) is never expressed at the surface of the earth since it occurs deep in the crust.
C) may indirectly allow parallel ridges and valleys to develop as tilted beds are exposed.
D) can only occur in coastal regions with sufficient wave action
42. The first real proof of ocean-floor spreadingA) was found in the trenches that rim the Pacific Ocean
B) was found in the observation of magnetization patterns on either side of ocean ridges
C) was discovered by Alfred Wegener just before his death in 1930
D) was the direct measurement of continental displacement using extremely accurate satellite surveys.
43. All the following geological features could be formed where plates collide exceptA) midocean ridges
B) mountain ranges
C) volcanoes
D) island arcs
44. A planet that rotates in the opposite direction from most of the other planets and satellites isA) Venus
B) Jupiter
C) Saturn
D) Uranus
45. A lunar eclipseA) occurs when the earth's shadow falls on and obscures the moon
B) can only occur during the first or last quarter phase of the moon
C) occurs when the moon is positioned between the sun and the earth
D) is another name for a solar eclipse
46. Compared to the orbits of the planets, the orbits of comets about the sun areA) perfect circles
B) longer and narrower
C) shorter and wider
D) exactly the same as those of the planets
47. Cepheid variable stars are valuable to astronomers becauseA) they are the only stars that are known to have planets orbiting them
B) they come in lots of different colors and contain a diversity of elements, thus giving a good sample of the universe.
C) they can be used to find the distance to the star groups in which they were found
D) they emit natural radio signals that can be employed in interstellar navigation
48. The temperature of a star can be found from itsA) spectrum
B) position in a galaxy
C) apparent brightness
D) doppler shift compared to the apparent brightness
49. The object thought to lie at the center of the Milky Way Galaxy is aA) pulsar
B) Cepheid variable
C) black hole
D) quasar
50. Primary cosmic raysA) are undetectable by humans and thus have defied definition
B) are found only on the dark side of the moon
C) were first discovered by William Herschel in 1781.
D) passing through the retinas of astronauts have the appearance of flashes of light

Expert:  Kathy replied 2 years ago.
I will complete them within the next hour. Thanks
Customer: replied 2 years ago.
thank you and i will show my appreciatation
Expert:  Kathy replied 2 years ago.
I will work on your questions next an emergency arise and I could not complete them within the hour. Sorry for the inconvenience. Thanks
Customer: replied 2 years ago.
ok
Expert:  Kathy replied 2 years ago.
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Kathy, Teacher
Category: Homework
Satisfied Customers: 3129
Experience: Elementary teacher for 16 years Bilingual Spanish English and with a Psychology Masters
Kathy and 7 other Homework Specialists are ready to help you

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