Starting from the front door of a ranch house, you walk 60.0 m due east to a windmill, turn around, and then slowly walk 40.0 m west to a bench, where you sit and watch the sunrise. it takes you 28.0 s to walk from the house to the windmill and then 36.0 s to walk from the windmill to the bench. for the entire trip from the front door to the bench, what are your (a) average velocity and (b) average speed?

The average velocity will be equal to 0.3125 m/s while the average speed will be equal to 1.5625 m/s.

We know that the average velocity is defined as the ratio of displacement to total time taken to reach that position. therefore,

Given to us

The displacement between the front door of a ranch house and the bench is 20m,

Time taken to cover that distance = 36 + 28 = 64 sec

Average speed is defined as the ratio of total distance covered to total time taken for the entire journey.

Given to us

Total distance = 60 + 40 = 100 m

Total time = 36s +28s = 64 sec

Hence, the average speed of the man is 1.5625 m/s.

Learn more about Velocity:

link

Part a)

Part b)

Explanation:

Part a)

As we know that average velocity is defined as the ratio of displacement and time interval

so here we have

so here she start from her house and move towards east at 60 m distance  then she turn back and moves towards west by 40 m distance

Now we know that time taken by it to move 60 meter distance is 28 s and then time taken to move next 40 m distance is 36 s

so here displacement is given as

now total time taken be it is given as

now average velocity is given as

Part b)

now we know that total distance of whole motion is given as

total time = 64 s

now average speed is given as

volume: 22

density: 7.04

carbon is found in all living things. carbon atoms move constantly through

living organisms, the oceans, the atmosphere, and the earth’s crust in what is

known as the carbon cycle. the directions taken by carbon atoms through this

cycle are very complicated and can take millions of years to make a full circle.

all animals, from humans to the dinosaurs are part of the carbon cycle. when

animals eat food, they get carbon in the form of carbohydrates and proteins.

in animals, oxygen combines with food in the cells to produce energy for daily

activity and then gives off carbon. the carbon combines with oxygen to form

carbon dioxide (co2) and is released back into the atmosphere as a waste

product when animals breathe and exhale.

from 145-65 million years ago, earth was much

hotter than today and covered with dense,

tropical swamp forests. the trees and other

plants were immense and

provided an endless supply of

food for the giant animals that

roamed the land. somewhere in

the air above one of these

forests, a lone carbon atom has joined

up with two oxygen atoms to form a molecule of co2.

the co2 molecule was sucked into the tiny holes (stomata) on the leaf of a

fern plant and joined with sunlight, chlorophyll and water to make food and

energy in the plant’s cells through photosynthesis. the oxygen (o2) from the

co2 molecule was sent back into the atmosphere; the carbon atom (c) was

detached and used to make a molecule of sugar.

if that carbon atom had been eaten instead, a totally

different situation would have developed. let’s say

that a giant plant-eating dinosaur (herbivore) ate the

fern for breakfast, and swallowed the carbon in the

fern in the form of carbohydrates and proteins. in

the process of respiration, oxygen combined with

the carbohydrates and proteins in the dinosaur’s cells

to provide energy for its daily activity.