67 points plus brainlest if done correctly.I will report you if you answer 3 or less of the questions, also must post all the an
swers at the same time.
11.
People with Down syndrome receive education and training to learn _____.
their chances of having a genetic disorder
about the excess mucus in their lungs
how their condition can best be treated
skills to find employment
12.
Sex-linked traits that are controlled by recessive alleles are _____ likely to show up in males.
more
less
not
equally
13.
Hemophilia is caused by _____.
a missing copy of one chromosome
a recessive allele on the X chromosome
codominant alleles for the trait
an extra copy of a chromosome
14.
Many characteristics are affected by interactions between genes and _____.
alleles
carriers
the environment
chromosomes
15.
Use the diagram to answer the question.
Which describes Step 1?
The plasmid containing the human gene is being taken up by a bacterial cell.
The bacterial cell is reproducing, and the new bacteria contain the human gene.
The human gene is attaching to the open ends of the plasmid and forming a closed ring.
An enzyme is cutting open the plasmid and is removing a gene from the human DNA.
11.
People with Down syndrome receive education and training to learn _____.
their chances of having a genetic disorder
about the excess mucus in their lungs
how their condition can best be treated
skills to find employment
12.
Sex-linked traits that are controlled by recessive alleles are _____ likely to show up in males.
more
less
not
equally
13.
Hemophilia is caused by _____.
a missing copy of one chromosome
a recessive allele on the X chromosome
codominant alleles for the trait
an extra copy of a chromosome
14.
Many characteristics are affected by interactions between genes and _____.
alleles
carriers
the environment
chromosomes
15.
Use the diagram to answer the question.
Which describes Step 1?
The plasmid containing the human gene is being taken up by a bacterial cell.
The bacterial cell is reproducing, and the new bacteria contain the human gene.
The human gene is attaching to the open ends of the plasmid and forming a closed ring.
An enzyme is cutting open the plasmid and is removing a gene from the human DNA.
1 answer:
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a) E = 0
b)
Explanation:
a)
We can solve this problem using Gauss theorem: the electric flux through a Gaussian surface of radius r must be equal to the charge contained by the sphere divided by the vacuum permittivity:
where
E is the electric field
q is the charge contained by the Gaussian surface
is the vacuum permittivity
Here we want to find the electric field at a distance of
r = 12 cm = 0.12 m
Here we are between the inner radius and the outer radius of the shell:
However, we notice that the shell is conducting: this means that the charge inside the conductor will distribute over its outer surface.
This means that a Gaussian surface of radius r = 12 cm, which is smaller than the outer radius of the shell, will contain zero net charge:
q = 0
Therefore, the magnitude of the electric field is also zero:
E = 0
b)
Here we want to find the magnitude of the electric field at a distance of
r = 20 cm = 0.20 m
from the centre of the shell.
Outside the outer surface of the shell, the electric field is equivalent to that produced by a single-point charge of same magnitude Q concentrated at the centre of the shell.
Therefore, it is given by:
where in this problem:
is the charge on the shell
is the distance from the centre of the shell
Substituting, we find:
17.
There are three different methods for charging objects:
- Friction: in friction, two objects are rubbed against each other. As a result, electrons can be passed from one object to the other, so one object will gain a net negative charge while the other object will gain a net positive charge due to the lack of electrons.
- Conduction: this occurs when two conductive objects are put in contact with each other, and charges (electrons, usually) are transferred from one object to the other one.
- Induction: this occurs when two objects are brought closer to each other, but not in contact. If one of the two objects has a net charge (different from zero) on its surface, then it will induce a movement of charges in the second object: in particular, in the second object, charges of the opposite polarity will be attracted towards the first object, while charges of same polarity will be repelled further away.
18.
Charged objects produce around themselves an electric field. The strenght of the electric field is given by (assuming the charged objects are spherical)
where k is the Coulomb's constant, q is the magnitude of the charge and r the distance from the centre of the charge. As we see, the strength of the field is inversely proportional to the square of the distance.
Also, the direction of the field is determined by the sign of the charge:
- if the charge is positive, the electric field points away from the charge (this means that other positive charges in the field will be repelled away)
- if the charge is negative, the electric field points towards the charge (this means that other positive charges in the field will be attracted towards it)
19.
Electrical force is given by:
where k is the Coulomb's constant, q1 and q2 are the two charges, and r their separation.
Gravitational force is given by:
where G is the gravitational constant, m1 and m2 are the masses of the two objects, and r their separation.
Similarities between the two forces:
- Both are inversely proportional to the square of the distance between the two objects, r
- Both are non-contact forces (the two objects can experience the forces even if they are not in contact)
- Both forces have infinite range
Differencies between the two forces:
- The electric force can be either attractive or repulsive, while the gravitational force is attractive only
- The electric force is much stronger than the gravitational force, due to the much larger value of the Coulomb's constant k compared to the gravitational constant G