Can someone please help with this,D:?
Why do we only see one side of the moon from Earth?
the Moon rotates at the same speed as the Earth
You can see different sides of the moon from varying locations on Earth
The Moon rotates one time on its axis every time it orbits the Earth
2.) How long does it take the moon to orbit the Earth?
29 1/2 days
30 days
28 days
3.) What are the dark features on the moon’s surface?
Volcanos
Mares or basins
Ray craters
4.) What causes an eclipse of either the sun or the moon?
location of the planets
temperature of the sun
angle of the sun
5.) What effect does the Moon’s gravitational pull have on the earth?
The moon keeps the Earth on an even keel on its axis
The moon causes the rise and fall of the Earth’s ocean tides
Both A and B
6.) Many features of the moon are clearly visible with the naked eye.
True
False
Not enough information
7.) Which of the following objects utilize wheels and axles?
bicycle and car
can opener, salad spinner, and egg beater
all of the above
8.) According to the video, a pulley is a ________ that turns.
wedge
lever
fulcrum
9.) Which of the following objects utilizes a pulley mechanism?
pizza cutters, see saws, and tooth brushes
flag poles, ski lifts, and tow trucks
all of the above
10.) A gear is a toothed wheel, cylilnder, or cone that transmits motion from one part of a machine to another; it is one of the oldest means of ___________.
lifting heavy objects
transmitting motion
separating two objects from each other
11.) What invention revolutionized the study of the sky?
microscope
airplane
telescope
12.) Since direct observation of atoms is almost impossible, scientists rely on:
microscopes.
proton beams.
models
13.) What can scientists learn from using a spectrometer?
how fast stars are moving
if there are spectacles in space
if people live on Mars
14.) How can the mass of the Sun be 300,000 times Earth’s, when its diameter is only 100 times Earth’s?
the Sun is hotter on its surface, making it heavier
the density of the Sun is much higher than the Earth’s, especially near the core
the gravity of the Sun increases its mass
15.) How do gamma rays at the core become visible light at the surface?
radiation is absorbed and re-emitted at a lower frequency
visible light rays are the same as gamma rays
the amplitude of the radiation drops as it moves to the surface
16.) Which planets besides Earth sustain life?
all of them
Mars and maybe Jupiter
none of them
17.) The Charge Cloud model describes _________ as being part of a diffused cloud of varying densities
atoms
protons
electrons
18.) What does the Molecular Theory of Matter say?
Molecules are made of tiny matter in motion
Matter is made of tiny molecules in motion
Molecules don’t matter
19.) What was the first subatomic particle to be discovered?
proton
neutron
electron
20.) When 2 hydrogen molecules react with 1 oxygen molecule what is the product?
carbon dioxide
nitrogen
water
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One Response to “Can someone please help with this,D:?”
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Not all of these are chemistry questions, but I’ll give it a shot.
1) The moon is tidally locked to the Earth, meaning that it rotates once on its axis for every revolution around the Earth.
A pulley is, in essence, a rotating lever.
2) The moon takes roughly 28 days to orbit earth (it’s more like 27.5 days).
3) The dark features on the moon’s surface are maria, or basins of solidified rock.
4) An eclipse is caused by the relative locations of the Sun, the Moon, and the Earth. For an eclipse to occur, the three bodies must be perfectly aligned.
5) The moon both stabilizes the Earth’s rotation about its axis and causes the oceanic tides.
6) True. Many of the larger craters and maria are visible without a telescope (i.e. the famous “man in the moon”)
7) All of the above.
9) Flag poles, ski lifts, and tow trucks all use pulley systems.
10) Gears transfer motion from one area to another, and are one of the oldest ways of doing so.
11) The telescope revolutionized the study of the sky.
12) Scientists rely on models to help explain the atom and its properties.
13) Scientists can use spectrometers to determine how fast objects are moving in space (via redshift).
14) The sun is considerably more dense than the Earth, especially in the solar core.
15) Radiation from the sun’s core is continuously absorbed and re-emitted by the gasses in the star, causing the energy of the released photons to be greatly decreased into the visible range.
16) No other planets other than Earth are confirmed to sustain life.
17) The “Charge Cloud” model describes the nature of electrons in an atom.
18) Matter is made of tiny molecules in continuous motion.
19) The electron was discovered by J. J. Thomson in 1897, predating the discovery of the proton by 22 years and the discovery of the neutron by 35 years.
20) Water is the product of the reaction between 2 hydrogen molecules and one oxygen molecule.
I hope this helped!