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2 years ago

Why is it so difficult for astronomers to see new stars in the process of birth?

1 answer:

4 0

Birth happens very quickly, so it is hard to "catch" stars in the act. - most stars are born inside dusty clouds, which block any light that may be coming from the stars.

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Vygotsky believed that scaffolding limited communication between the teacher and the learner.

spin [16.1K]

Answer: The given statement is False.

Lev Vygotsky gave a socio-cultural theory of cognitive development. According to this theory, socialization or social interaction of individual with people who are more knowledgeable than them plays a significant role in their cognitive development.

He described scaffolding as the support given to child by more knowledgeable others ( like parents or teachers). This means that scaffolding allowed communication between the teacher and the learner.

Thus, the given statement is False.

4 0

4 years ago

Read 2 more answers

How long will it take a 2.3"x10^3 kg truck to go from 22.2 m/s to a complete stop if acted on by a force of -1.26x10^4 N.What wo

Greeley [361]

The stopping distance is 45.0 m

Explanation:

First of all, we find the acceleration of the truck, by using Newton's second law:

$F=ma$

where

$F=-1.26\cdot 10^4 N$ is the net force on the truck

$m=2.3\cdot 10^3 kg$ is the mass of the truck

a is its acceleration

Solving for a,

$a=\frac{F}{m}=\frac{-1.26\cdot 10^4}{2.3\cdot 10^3}=-5.48 m/s^2$

where the negative sign means the acceleration is opposite to the direction of motion.

Now, since the motion of the truck is at constant acceleration, we can apply the following suvat equation:

$v^2-u^2=2as$

where

v = 0 is the final velocity of the truck

u = 22.2 m/s is the initial velocity

$a=-5.48 m/s^2$ is the acceleration

s is the stopping distance

And solving for s,

$s=\frac{v^2-u^2}{2a}=\frac{0-(22.2)^2}{2(-5.48)}=45.0 m$

Learn more about accelerated motion:

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6 0

4 years ago

One important way to adapt to diverse culture is to

AVprozaik [17]

1) give your self permission to make mistakes
2)Ask questions
3)take care of your physical health

4 0

4 years ago

Read 2 more answers

A test rocket is launched vertically from ground level (y = 0 m), at time t = 0.0 s. The rocket engine provides constant upward

dusya [7]

I: x = 1/2at²
II: v = at

I+II: x = 1/2a(v²/a²) = 1/2 v²/a

a = 1/2 v²/x

v = 30
x = 49

4 0

3 years ago

Read 2 more answers

A human eye is a convex lens. In normal eyesight, the image of an object in front of our eyes is formed exactly on the retina an

Allisa [31]

In farsighted eyesight (Hypermetropia ) 

A person with hypermetropia can see distant objects clearly but cannot see nearby objects distinctly.The light rays from a close by object are focused at a point behind the retina

 In nearsighted eyesight (Myopia ) 

A person with myopia can see nearby objects clearly but cannot see distant objects distinctly.the image of a distant object is formed in front of the retina

corrective measure in each case

1. In farsighted eyesight

This defect can be corrected by using a convex lens of appropriate power

2. In nearsighted eyesight

A concave lens of suitable power will bring the image back on to the retina and thus the defect is corrected.

7 0

3 years ago