How is calculating velocity different from calculating speed?

Answers

Answer 1
Answer:

The short answer is that velocity is the speed with a direction, while speed does not have a direction. Speed is a scalar quantity—it is the magnitude of the velocity. Speed is measured in units of distance divided by time (e.g., miles per hour, feet per second, meters per second, etc.).

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8. Charles Darwin was the first individual to convince the scientific community of theoccurrence of biological evolution. He based his findings on observations which he then used tomake inferences regarding changes in populations of species. Which of the following would bean inference based on observations?
All the biotic and abiotic factors in a particular areaA: ecosystem B: biomeC: habitat

Poor people in the worlds largest cities live in just a few dollars a day but typically have access to clean water and sewers

Answers

If the question is true/false- the answer would be false

Poor people usually do not have access to clean water and sewers.

Poor people usually do not have access to clean water and sewers.

The polarity of an oxygen-hydrogen bond is higher than the polarity of a nitrogen-hydrogen bond, allowing amines to be more soluble than alcohols True or false

Answers

Answer:

The answer is false. First part correct, second incorrect.

Explanation:

The affirmation “The polarity of an oxygen-hydrogen bond is higher than the polarity of a nitrogen-hydrogen bond” is correct: Oxygen is more electronegative than Nitrogen (3.5 O, and 3 N), then when they form a covalent bond with Hydrogen, OH-bond polarity is higher than NH-bond polarity. Nevertheless, the consequence is that alcohols (that have OH characteristic group) are more soluble in water (polar solvent) than amines (NH group). Then, second part of the affirmation is incorrect.

Answer:

False

Explanation:

Did the test and got it right

Did the first living cell evolve suddenly in a single step or gradually as the result of many intermediate steps?

Answers

Gradually as the result of many intermediate steps is my answer because as life on Earth for example started off with simple atoms making molecules, and as the time went past more complex compounds were be produced. And from there later on unicellular organisms started appearing. Nothing in evolution that I know of happens in a short time, at least from the human perspective.

How do we know the frequency of a wave when we can't see it?

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You find the frequency of a wave by V/WL.

12. Jacks and silversides are a good example of an evolutionary arms race between predators and prey. Describe the predatory adaptations of the jacks, and the defensive adaptations of the silversides

Answers

Answer:

Predators is an organism which can be described as the hunter who hunts for food. An d prey can be described as the organism on which the predator will feed.

Silversides can be described as small fishes which are very thin. They are usually found in fresh water or near the coastal areas.

The adaptation of the Jacks include :

  • They are fast.
  • They attack the prey in herds.

Adaptations of silverside are:

  • They have colour much transparent or like the colour of water which allows them to hide.
  • They travel in groups.

What is the only effective way invertebrates fight off disease?

Answers

Excretion is the only effective way invertebrates fight disease. Because they don't have an immune system working daily,  invertebrates only have the capacity to excrete and cleanse their body of harmful materials.