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3 years ago

20. Frigatebirds have webbed feet and spend much

Biology

1 answer:

Anettt [7]3 years ago

8 0

Answer:

Evolution changes the abilities of the Frigate birds.

Explanation:

The Frigate birds have webbed feet because they live in the ocean and unable to fly due to its big weight. Before the evolution, the Frigate birds lives in the ocean due to their large body weight but with the passage of time, evolution occurs that leads to formation of flying ability in the bird so now the bird have the old characteristics of their ancestor as well as new abilities in the physical traits of the Frigate birds due to the evolution.

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3 years ago

The table shows the changes in velocity for several different cars. Each change takes place over a 10-second interval. Which car

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<h2><u>Full Question:</u></h2>

The table shows the changes in velocity for several different cars. Each change takes place over a 10-second interval. Which cars are either

speeding up or slowing down?

Starting Velocity

Ending Velocity

Car A

30 km/h

Car B

O km/h

20 km/h

Car C

30 km/h

O km/h

Car D

O km/h

Car E

20 km/h

30 km/h.

<h2><u>Answer:</u></h2>

Acceleration is present in car B and E.

Deceleration is present in car C.

No change in velocity is seen in car A and D.

<h3><u>Explanation:</u></h3>

Acceleration is defined as the rate of change of velocity with time and is having a dimensional formula of $distance /time ^2$

When a body is having acceleration, the body has more final velocity than initial velocity. Deceleration is the opposite of acceleration which is seen when the body has less final velocity than initial velocity.

In A:

Initial velocity= 30 km/hr.

Final velocity= 30 km/hr.

So change in velocity = 30-30 km/hr = 0 km/hr.

So no acceleration is present.

In B:

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Final velocity= 20 km/hr.

So change in velocity = 20-0 km/hr = 20 km/hr.

So acceleration is present.

In C:

Initial velocity= 20 km/hr.

Final velocity= 0 km/hr.

So change in velocity = 0-20 km/hr = -20 km/hr.

So deceleration is present.

In D:

Initial velocity= 0 km/hr.

Final velocity= 0 km/hr.

So change in velocity = 0-0 km/hr = 0 km/hr.

So no acceleration is present.

In E:

Initial velocity= 20 km/hr.

Final velocity= 30 km/hr.

So change in velocity = 30-20 km/hr = 10 km/hr.

So acceleration is present.

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