PHYSICS HIGH SCHOOL

A source from which organisms generally take elements is called a/an A. exchange pool.
B. food web.
C. reservoir.
D. biotic community.
answered|Score .8

Answers

Answer 1
Answer:  a source from which organisms generally take elements is called a food web

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A ball is thrown horizontally from the top ofa building 140 m high. The ball strikes the
ground 54 m horizontally from the point of
release.
What is the speed of the ball just before it
strikes the ground?
Answer in units of m/s.

Answers

Answer:

v = d / t = 54 / 5.34 = 10.11 m/s (rounded to two decimal places)

Explanation:

It is proposed that future space stations create an artificial gravity by rotating. Suppose a space station is constructed as a 1600-m-diameter cylinder that rotates about its axis. The inside surface is the deck of the space station. What rotation period will provide "normal"gravity?

Answers

The rotation period that will provide normal gravity will be 57.12 seconds.

From the information given, the diameter of the cylinder is 1600m. Therefore, the radius will be:

= Diameter / 2.

= 1600 / 2

= 800m

Acceleration due to gravity = 9.8m/s²

Since a = rw², we'll use the subject of the formula to find w and this will be:

w = √g/✓r

w = ✓9.8 / √800

w = 0.11 rad/s

Therefore, the rotation period will be:

T = 2π/w

T = 2π/0.11

T = (2 × 3.142) / 0.11

T = 57.12 seconds

In conclusion, the correct option is 57.12 seconds.

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Answer

given,

diameter of the cylinder = 1600 m

radius = 800 m                                  

acceleration due to gravity  = 9.8 m/s²

a = r ω²                                                  

\omega = \sqrt{(g)/(r)}

\omega = \sqrt{(9.8)/(800)}

\omega = 0.11\ rad/s      

we know time period                      

T = (2\pi )/(\omega )

T = (2\pi )/(0.11)

T = 57.12 s                              

In comparing the Ptolemaic system to the Copernican system, neither is entirely correct since Ptolemy said the earth was at the center and Copernicus said the planets had circular orbits.

Answers

In comparing the Ptolemaic system to the Copernican system, neither is entirely correct since Ptolemy said the earth was at the center and Copernicus said the planets had circular orbits. This is correct

Which describes the characteristics of a liquid?a. It has no fixed volume or shape.
b. It has a fixed volume and shape.
c. It has high energy and expands to fill the container.
d. It has a fixed volume and varied shape.

Answers

What happens when you pour water in a glass? It takes the shape of the glass. This means that water can't have a fixed shape or volume

An object in projectile motion will follow wich path

Answers

It will tend to follow a trajectory path. When a projectile is being flung or flown away by a certain type of force, the trajectory is what it follows through the means of both force and function of time itself. It's also called as flight path.

Classify the following as chemical or physical change: (a) adding sugar to lemonade, (b) plants using CO2 and H2O to form O2 and sugar, (c) boiling water, (d) frying an egg, (e) rust forming on metal, (f) fruit rotting, (g) removing salt from water by evaporation.

Answers

Answer:

A change is said be chemical change when a change in chemical property of a substance occurs and the new substance is chemically different from old one. A change is said to be physical change when only physical properties change but chemically the substances remain same.

a) adding sugar to lemonade- It is a physical change because sugar is being dissolves in the lemonade. There is no change in the chemical property.

b) plants using CO₂ and H₂O to form O₂ and sugar is a chemical change because new products which are chemically different are formed.

c) boiling water - is a physical change because only the physical state from liquid to gas changes. Chemically water retains its properties.

d) frying an egg - the properties of egg changes after frying. Hence, it is a chemical change. A fried egg does not retain properties of an uncooked one.

e) rust forming on metal- is a chemical change. Corrosion ( rusting) is a chemical change as rust is chemically different from the metal.

f) fruit rotting - is a chemical change. When microbes act on the fruit, the fruit starts to rot.

g) removing salt from water by evaporation- it is a physical change. The salt and water retain their physical properties as mixture and when separated by evaporation process.


(a) physical (b) chemical (c) physical (d) chemical (e) chemical (f) chemical (g) physical
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