A rolling ball has an initial velocity of 5 meters per second. 30 seconds later, its velocity is 2 meters per second. What is the acceleration of the ball?

Answers

Answer 1
Answer: Acceleration is defined as the velocity of an object over a period of time.
Mathematically, 
Acceleration, A = Velocity [V] /Time [T]
From the question given above, we are told that 
T = 30 seconds
Initial velocity, V1 = 5
Final velocity, V2 = 2
Change in velocity, V = V1 - V2 = 5 - 2 =3 
A = V / T = 3 / 30 = 0.1
Therefore A = 0.1 m/s^2.

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9. The blood pressure of a soldier is measured while he is resting. The soldier is then exposed to a stressful environment and his blood pressure is measured again.

Answers

Answer:

his blood pressure is higher

Explanation:

Because your blood pressure is lower when rested because your blood doesnt need to go as fast when rested

Which of the following will not prevent many bacterial infections

Answers

The provided question is not complete as it lacks the appropriate choices for the answer, however, the correct choices are:

Which of the following will NOT prevent many bacterial infections?

a. allowing foods to cool completely before refrigerating

b. washing hands and surfaces with soap and water

c. storing food in a refrigerator

d. heating objects to very high temperatures

Answer:

The correct answer would be - allowing foods to cool before refrigerating.

Explanation:

Bacterial infections can be prevented by many processes such as washing hands with soap and water thoroughly for a minimum of twenty seconds. Storing food in the refrigerator helps the food to be fresh and infection-free from various microbes.

Heating the food, water, and tools to very high temperature helps in killing the bacteria present in these and leads to bacterial infection. Cooling the food before storing it in the refrigerator may cause bacteria to infect the food.

Write the following statement as Prolog clauses: Mammals have four legs and no arms, or two arms and two legs. A horse is a mammal. A horse has no arms. Can Prolog derive that a horse has four legs

Answers

Answer:

Explanation:

mammal(X) :- legs(X,4), arms(X,0).

mammal(X) :- legs(X,2), arms(X,2).

mammal(horse).

arms(horse,0).

As far as I can tell, prolog cannot derive that a horse has four legs. Why so? You may ask. I'd say then, because there isn't any rule(s) for prolog to use in determining the legs. Inference rules can also not be used to determine that the fact that a horse is a mammal and it has 0 arms, it certainly must have 4 legs.

The theory of natural selection states that: a. individuals that live the longest are best adapted and selected for survival in the next generation b. the best-adapted individuals survive and reproduce, contributing the most genes to the next generation c. only the largest and strongest survive d. individuals that mutate in response to their environment will survive at the expense of those individuals who are genetically stable

Answers

Answer:

Option (b).

Explanation:

Evolution may be defined as the change in the characteristics of the organism over several generation with respect to time. The natural selection acts as the main driving force for evolution.

Darwin is known as the father of evolution. According to natural selection, the individuals that are best adapted to their environment will survive and reproduce more and transfer their genes to the next generation.

Thus, the correct answer is option (b).

Answer:

The correct answer is option b.

Explanation:

Natural selection generally illustrates that some of the individuals in a population get adapted significantly with their surroundings, and as a consequence, will thrive. Due to this, the genes get inherited on to the next generation, which may help the coming generation to get well adapted to the present environment. Therefore, the individuals that adapt adequately will thrive and reproduce and will pass on the majority of the genes to the next generation.  

1.In your own words, describe chromosomes, genes, and DNA.2.Recall that traits are observable characteristics of an individual. Some examples given in this lesson were tongue rolling, earlobe shape, and the presence or absence of a widow’s peak.
3.Explain why individuals in a population have different observable traits. Use your observation skills to find two examples of traits that you have inherited. These traits must be different from the ones that are discussed in the lesson.

Answers

Genes are composed of a sequence of nucleotides that code for a functional protein, straddled between a start and stop codon and are regulated by a promoter and regulator upstream. DNA, on the other hand, is a sequence of deoxyribonucleotides in an antiparallel double-helix chain. Genes are contained in the DNA double helix. Chromosomes are long DNA strands that are we packaged to into the small of the nucleus in a cell. The chromosomes contain packaging proteins such as histones in which DNA is wound to form nucleosomes.


This is because a population has different alleles (varying forms) of a gene distributed across the population in different frequencies. These alleles are passed down generation by parents to offspring. Each parent gives one allele to its offspring in diploid organisms. The difference in traits is because of this variation in the genotype of an organism. Additionally, how this genotype interacts with the environment to give the individual his phenotypic trait also give individuals varying traits.


An example of such a trait is my wavy hair, an observable trait I have because one of my parents has straight hair while the other has curly hair. I inherited an allele from both parents for hair texture. Since both allele exhibit incomplete dominance, I, therefore, have wavy hair.






According to the lock and key model of enzymes, which of the following would be the most likely substrate?a. V

b. X

c. Y

d. Z

e. A realistic substrate is not shown in the diagram.

Answers

Answer:

b.X is most likely to be the substrate