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## If a reaction in one direction releases energywhat is the reaction in the opposite direction

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If a reaction in one direction releases energywhat is the reaction in the opposite direction
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## Why is indoor air pollution a serious health hazard in some developing countries? a. the burning of coal releases significant amounts of particulates into the air. b. people smoke more in developing countries. c. many homes rely on indoor burning of wood or dung without proper ventilation. d. most houses in these countries are well insulated, increasing household exposure to radiation?

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Why is indoor air pollution a serious health hazard in some developing countries? a. the burning of coal releases significant amounts of particulates into the air. b. people smoke more in developing countries. c. many homes rely on indoor burning of wood or dung without proper ventilation. d. most houses in these countries are well insulated, increasing household exposure to radiation?

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## Airplane releases a ball as it flies parallel to the ground at a height of 195m, the ball lands on the ground at exactly 195m from the release piont, calculate the speed v of the plane

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Answer:

a) The time the police officer required to reach the motorist was 15 s.

b) The speed of the officer at the moment she overtakes the motorist is 30 m/s

c) The total distance traveled by the officer was 225 m.

Explanation:

The equations for the position and velocity of an object moving in a straight line are as follows:

x = x0 + v0 · t + 1/2 · a · t²

v = v0 + a · t

Where:

x = position at time t

x0 = initial position

v0 = initial velocity

t = time

a = acceleration

v = velocity at time t

a)When the officer reaches the motorist, the position of the motorist is the same as the position of the officer:

x motorist = x officer

Using the equation for the position:

x motirist = x0 + v · t (since a = 0).

x officer = x0 + v0 · t + 1/2 · a · t²

Let´s place our frame of reference at the point where the officer starts following the motorist so that x0 = 0 for both:

x motorist = x officer

x0 + v · t = x0 + v0 · t + 1/2 · a · t²      (the officer starts form rest, then, v0 = 0)

v · t = 1/2 · a · t²

Solving for t:

2 v/a = t

t = 2 · 15.0 m/s/ 2.00 m/s² = 15 s

The time the police officer required to reach the motorist was 15 s.

b) Now, we can calculate the speed of the officer using the time calculated in a) and the  equation for velocity:

v = v0 + a · t

v = 0 m/s + 2.00 m/s² · 15 s

v = 30 m/s

The speed of the officer at the moment she overtakes the motorist is 30 m/s

c) Using the equation for the position, we can find the traveled distance in 15 s:

x = x0 + v0 · t + 1/2 · a · t²

x = 1/2 · 2.00 m/s² · (15s)² = 225 m

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## Biology B Unit 4: The Human Body – Lesson 12: The Integumentary System 1) Which of these is NOT a function of your skin? (1 point) a) keeps your body cool when you exercise b) releases waste products like urea and salts c) helps prevent pathogens from entering your body d) holds the bones of the skeleton together 2) The integumentary system includes (1 point) a) skin only b) hair only c) nails only d) skin, hair, and nails 3) Which of these skin cancers is most likely to spread to other parts of the body without early treatment? (1 point) a) basal cell carcinoma b) squamous cell carcinoma c) melanoma d) basal cell carcinoma and melanoma 4) What happens when the keratin-producing cells of the skin die? (1 point) a) Melanin and keratin are produced. b) An additional dermis layer is formed. c) A waterproof coating is formed. d) Melanin is produced. 5) Dandruff is caused by the shedding of excess cells from the outer layer of the skin. What is this outer layer called? (1 point) a) dermis b) hypodermis c) epidermis d) hair follicle

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Answer:

Two diseases caused by microorganism include –

a) Ebola hemorrhagic fever

b) Tuberculosis

Explanation:

Microbes are unicellular organisms. There are mainly five types microorganism that cause diseases. –

a) Virus

Example of a disease caused by Virus –

Ebola hemorrhagic fever caused by Ebolavirus and Filoviridae family

b) Bacteria

Example of a disease caused by bacteria –

Tuberculosis (TB) is a kind of respiratory disease caused by bacterium called Mycobacterium tuberculosis.

c) Fungi

Example of a disease caused by Fungi

Athlete’s foot is a fungal disease caused by Trichophyton

d) Protozoa

Example of a disease caused by Protozoa

Ameobiasis caused by Entamoeba histolytica

e) Worms

Example of a disease caused by worms

Infection in intestine is caused by Ascaris lumbricoides, Ancylostoma duodenale,  etc.

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## What is the name for the process in which an ovary releases a ripened egg each month

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Answer;

-Helium nucleus formed, hydrogen nucleus formed, isotope of hydrogen, tritium formed

Explanation;

-Nucleosynthesis is the process of creating new atomic nuclei from preexisting nucleons (protons and neutrons). The primordial preexisting nucleons were formed from the quark-gluon plasma of the Big Bang as it cooled below ten million degrees.

-This first process may be called nucleogenesis, the genesis of nucleons in the universe. The subsequent nucleosynthesis of the elements (including all carbon, all oxygen, etc.) occurs primarily in stars either by nuclear fusion or nuclear fission.

-Stellar nucleosynthesis is the process by which elements are created within stars by combining the protons and neutrons together from the nuclei of lighter elements. All of the atoms in the universe began as hydrogen. Fusion inside stars transforms hydrogen into helium, heat, and radiation. Heavier elements are created in different types of stars as they die or explode.

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