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galina1969 [7]
3 years ago
15

What are the two factors that affect the friction between two surfaces

Biology
1 answer:
BabaBlast [244]3 years ago
7 0

Answer:

The two factors are:

• The kind/type of surface involved.

• The force that the surface are being pushed together.

Explanation:

Friction can be said to be the general term used to describe the force that one surface exert on another when they rub against each other.

When the surface is partially not smooth or totally rough, a greater force is been needed to move one surface past the other.

The weight of the can also significantly be a key factor. This is where the need to friction reduction come to play a role; and need for friction reducers like lubricant, rollers etc helps.

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An AAbb strain is crossed to an aaBB strain and the resulting progeny self-crossed. If A andB are located 10 cM apart from each
skelet666 [1.2K]

Answer:

20.3%

Explanation:

Given that:

An AAbb strain is crossed to an aaBB strain

i.e.

                   AAbb      ×      aaBB

gametes       Ab                   aB

For F₁

generation;  

If the resulting progeny are now self-crossed.

We know that the genetic distance between these two genes on the same chromosome is said to be 10 cM.

i.e. the recombinant gene = 10%; Hence, the parental gene will be (100 - 10)% = 90%

Ab ×   aB  =   Aa    AB      ab     Bb

From above; the parental gene;

Ab and   aB = 90% with each being 45%

i.e. Ab = 45%   and aB = 45%

while the recombinants genes are:

AB and ab = 10%

i.e. AB = 5%  and ab = 5%

Finally; the percentage of aaBB is = aB% ×  aB% × 100%

the percentage of aaBB is = 0.45 × 0.45 × 100%

the percentage of aaBB is = 20.25%  ≅ 20.3%

8 0
3 years ago
Fossils cannot be used to explain changes in the earth.
OlgaM077 [116]
The answer is False
6 0
3 years ago
Hi! I am confused on how to do Q2. Anyone doing A-levels can solve that questions and explain? Thanks! <3
riadik2000 [5.3K]

Answer:

i) Glucose

ii) β(1-4) glycosidic bonds.

iii) Oxygen

Explanation:

Cellulose is an important structural carbohydrate found in plants. It forms a major component of the plant cell wall.

Cellulose is a polysaccharide formed by monomers of glucose.  These glucose monomers are joined together by covalent bonds called β(1-4) glycosidic bonds, which means that the 1st carbon of one glucose is bound to the 4th carbon of the next glucose. To make this arrangement,  every other glucose molecule in cellulose is inverted, which you can see in the diagram.

Glucose monomers contain carbon, hydrogen, and oxygen only. If you look at the pattern of the molecule (remembering every second glucose is inverted), you can see that Z must be O.

The functional group denoted by Z is oxygen. The OH groups on the glucose from one cellulose chain form hydrogen bonds with oxygen atoms on the same or on another chain, holding the chains firmly together and forming very strong molecules - giving cellulose its strength.

4 0
3 years ago
Humans have<br> chromosome pairs.<br> DONE
dmitriy555 [2]

Answer:

True

Explanation:

Humans have 23 pairs of chromosomes, for a total of 46 chromosomes.

7 0
3 years ago
which question to scientist need to asnwer to determine whether CRISPR can be used tofight a new bacterium that is resistant to
QveST [7]

Answer:

hiiurdfbjjjjkhdgyrfjpgtzy99f3w8

7 0
2 years ago
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