A60.0-kg and a 90.0-kg skydiver jump from an airplane at an altitude of 6.00×103m , both falling in a headfirst position. make some assumption on their frontal areas and calculate their terminal velocities. how long will it take for each skydiver to reach the ground (assuming the time to reach terminal velocity is small)? assume all values are accurate to three significant digits.

Solution:

As per the question:

Mass of the skydiver 1 = 60.0 kg

Mass of the skydiver 2 = 60.0 kg

Altitude, H =

Now,

To calculate the terminal velocities of the skydivers:

We know that the drag force equals the weight of the diver and the net force acting on the body of the divers is zero as the body has constant velocity.

This velocity is the terminal velocity of the body.

Now,

Using the law of conservation of energy:

Potential Energy, PE = Kinetic Energy, KE

Thus

Now,

The time taken by each skydiver to reach the ground is given by:

where

u = initial velocity = 0 m/s

Thus

t = 34.99 s

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

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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.  

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