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3 years ago

What does the unicellular organisms found in extreme environments such as boiling water

1 answer:

4 0

These are unicellular organisms that tend to live in very extreme environments, such as boiling waters and thermal vents. Archaebacteria are found in extreme environments such as hot boiling water and thermal vents under conditions with no oxygen or highly acid environments. ...

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Se coloca una tuerca con una llave, como muestra la figura, si el brazo r= 30 cm y el torque de apriete recomendado para la fuer

irina [24]

Answer:

F = 100 N

Explanation:

The torque is given by the expression

τ = F x r

where bold letters indicate vectors, the magnitude of this expression is

τ = F r sin θ

In general, when tightening a nut, the force is applied perpendicular to the arm, therefore θ = 90 and sin 90 = 1

τ = F r

F = τ / r

calculate

F = 30 / 0.30

F = 100 N

6 0

3 years ago

A mirror forms an erect image 40cm from the object and one third its height where must the mirror be situated

iragen [17]

The mirror is located 30 cm from the object

Explanation:

To solve the problem, we can use the magnification equation, which states that:

$M=\frac{y'}{y}=-\frac{q}{p}$

where

M is the magnification

y' is the size of the image

y is the size of the object

q is the distance of the image from the mirror

p is the distance of the object from the mirror

In this problem, we notice that the image formed by the mirror is erect and diminished: this means that this is a convex mirror, so the image is virtual, and this means that the image and the object are located on opposite sides of the mirror. Therefore,

$p-q=40 cm$ (distance of the image from the object is 40 cm, but since the image is virtual, q is the negative)

The size of the image is 1/3 that of the object, so

$y'=\frac{1}{3}y$

Solving the equation for p, we find the distance between the object and the mirror:

$\frac{y'}{y}=-\frac{p-40}{p}\\\\p=\frac{40}{1+\frac{y'}{y}}=\frac{40}{4/3}=30 cm$

So, the mirror is 30 cm from the object.

#LearnwithBrainly

5 0

3 years ago

What are 7 elements from the periodic table that are named after objects in outer space

suter [353]

Helium... from the greek word helios... the sun
selenium... from the greek word selene... the moon 
palladium.. after the asteroid pallas 
tellurium...from the greek word tellus... the earth 
mercury...after the planet mercury 
cerium... after the asteroid ceres 
uranium...after the planet uranus 
neptunium.. after the planet neptune 
plutonium.. after the planet pluto

5 0

3 years ago

An amusement park ride raises people high into the air, suspends them for a moment, and then drops them at a rate of free-fall a

blsea [12.9K]

Answer: apparent weighlessness.

Explanation:

1) Balance of forces on a person falling:

i) To answer this question we will deal with the assumption of non-drag force (abscence of air).

ii) When a person is dropped, and there is not air resistance, the only force acting on the person's body is the Earth's gravitational attraction (downward), which is the responsible for the gravitational acceleration (around 9.8 m/s²).

iii) Under that sceneraio, there is not normal force acting on the person (the normal force is the force that the floor or a chair exerts on a body to balance the gravitational force when the body is on it).

2) This is, the person does not feel a pressure upward, which is he/she does not feel the weight: freefalling is a situation of apparent weigthlessness.

3) True weightlessness is when the object is in a place where there exists not grativational acceleration: for example a point between two planes where the grativational forces are equal in magnitude but opposing in direction and so they cancel each other.

Therefore, you conclude that, assuming no air resistance, a person in this ride experiencing apparent weightlessness.

3 0

3 years ago

Read 2 more answers

Help with this please!

DochEvi [55]

Answer:

I have no clue.

Explanation:

3 0

4 years ago