Answer:
If two objects are dropped at the same height, the heavier object will hit the ground first.
Explanation:
A proper hypothesis has the form:
"If ... , then ... ".
Now, why the other sentence aren't hypothesis?
This sentence its an OPINION. It may be true that, for the speaker/writer, orange popsicles taste sweeter, but this is an subjective opinion, and difficult to test.
This sentence its an STATEMENT. If we wish to make an proper hypothesis, it should take the form:
If children wear backpacks, then they do better academically.
This sentence its another OPINION. This opinion COULD be tested, but the proper way of write it as an hypothesis would be:
If someone listed to loud music only three hours a day, then there shoul be no effect on his/her hearing.
Answer:
Answer is:If two objects are dropped at the same height, the heavier object will hit the ground first.
Explanation:
b. A planet's orbit covers equal distances in equal amounts of time; the speed of a planet's orbit depends on its distance from the Sun; the bigger the planet, the slower it moves.
c. Planets orbit in elliptical patterns; a planet's orbit covers equal areas in equal amounts of time; planets' orbits are shorter or longer depending on their distance from the Sun.
The correct answer to the question is : C) Planets orbit in elliptical patterns; a planet's orbit covers equal areas in equal amounts of time; planets' orbits are shorter or longer depending on their distance from the Sun.
EXPLANATION:
Before coming into any conclusion, first we have to understand three laws of Kepler on planetary motion.
First law: Every planets moves around the sun in elliptical orbits with the sun situated at one of their foci.
Second law: Planets sweep out equal areas in equal interval of time.
Third law: The square of time period of rotation of every planet is directly proportional to the cube of semi major axis.
Hence, from above we see that the option three corresponds to the Kepler's laws partially.
Hence, the correct statement is option three.
B. Both atoms will have the same number of protons.
C. Both atoms will have the same number of neutrons.
D. Cobalt has one less proton.
Answer:
Cobalt has one less proton.
Explanation:
Nickel and Cobalt both has almost same atomic mass number approximately 59 but has different atomic number.
Number of proton and electrons in an atom is given by,
Number of proton = Number of electron = atomic number of an atom.
Number of neutron in an atom is given by,
Number of neutrons = Atomic mass number - atomic number
Case 1: Cobalt
Atomic mass number = 59
Atomic number = 27
Number of proton and electrons in Nickel is given by,
Number of proton = Number of electron = atomic number of an atom.
Number of proton = 27
Number of proton = 27
Number of neutron in an atom is given by,
Number of neutrons = Atomic mass number - atomic number
Number of neutrons = 59 - 27
Number of neutrons = 32
Case 2: Nickel
Atomic mass number = 59
Atomic number = 28
Number of proton and electrons in Nickel is given by,
Number of proton = Number of electron = atomic number of an atom.
Number of proton = 28
Number of neutron in an atom is given by,
Number of neutrons = Atomic mass number - atomic number
Number of neutrons = 59 - 28
Number of neutrons = 31
Cobalt has one less proton.
Thus, Option D is correct.
Answer: The correct answer is option D.
Explanation:
Cobalt and Nickel both are transition metals which means that their last electron enter d-orbitals.
These two elements have similar atomic masses but differ in the atomic number.
Atomic number is equal to the number of protons or electrons present in that element.
Atomic number = number of protons = number of electrons
Atomic Mass is the sum of protons and neutrons in an element
Atomic mass = Number of protons + Number of neutrons
Atomic Number = 27
Number of protons = 27
Atomic mass = 59
Number of neutrons = 59 - 27 = 32
Hence, Number of protons in this element is 27 and number of neutrons are 32.
Atomic Number = 28
Number of protons = 28
Atomic mass = 59
Number of neutrons = 59 - 28 = 31
Hence, Number of protons in this element is 28 and number of neutrons are 31.
Hence, the correct answer is option D.
b. False
B. a gamma ray.
C. an X-ray.
D. an alpha ray.
E. They all penetrate material the same distance