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4 years ago

What are the three hallmarks of science

1 answer:

3 0

<span>1Seek explanations for observed phenomena that rely solely on natural causes
2Progresses through creating and testing models of nature that explain observations as simply as possible
3Scientific model must make testable predictions; abandon or revise model if predictions do not agree with observations</span>

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A 12.0-g bullet is fired horizontally into a 112-g wooden block that is initially at rest on a frictionless horizontal surface a

sergiy2304 [10]

The speed would be in a decimal? Or do you want it in a fraction?

7 0

3 years ago

A volcano erupts and launches a chunk of hot magma horizontally with a speed of 252 m/s. The magma travels a horizontal distance

ArbitrLikvidat [17]

Answer:

The value is $v_y = -48.61 \ m/s$

Explanation:

From the question we are told that

The horizontal speed is $u_x = 252 \ m/s$

The horizontal distance is $d = 1250 \ m$

Generally the time taken by the hot magma in air before landing is mathematically represented as

$t = \frac{d}{u_x}$

=> $t = \frac{ 1250 }{252}$

=> $t = 4.96 \ s$

Generally the initial vertical velocity of the magma when it was lunched is

$u_y = 0 \ m/ s$

Then the final velocity of the magma when it hits the ground is mathematically represented s

$- v_y = u_y + gt$

Here the negative sign mean that the direction of the velocity is towards the negative y -axis

$- v_y = 48.61 \ m/s$

=> $v_y = -48.61 \ m/s$

7 0

3 years ago

if 1.5kg block is pulled across a horizontal surface that has a coefficient of kintic friction of 0.60. if a block is pulled by

inysia [295]

Answer:

3.2N

Explanation:

Given parameters:

Mass of block = 1.5kg

Coefficient of kinetic friction = 0.6

Force of pull on block = 12N

Unknown:

Net force on the block = ?

Solution:

Frictional force is a force that opposes motion:

Net force = Force of pull - Frictional force

Frictional force = umg

u is coefficient of kinetic friction

m is the mass

g is the acceleration due to gravity

Frictional force = 0.6 x 1.5 x 9.8 = 8.8N

Net force = 12N - 8.8N = 3.2N

4 0

3 years ago

Drag each tool to the correct category. Identify the common use of each tool used by space scientists and earth scientists

inysia [295]

<h3>Answer</h3>

Tools that magnify objects Tools that don't magnify objects

magnifying glass rule

telescope binoculars

microscope

<h3>Explanation</h3>

radio dish: is use to receive radio waves from the air.

binoculars: provide a magnified stereoscopic view of distant objects.

streak plate: is a technique which is used to grow bacteria on a growth media surface so that individual bacterial colonies are isolated and sampled.

wind vane: is used to determine wind direction.

ruler: is used for measuring a line.

microscope: is used to magnify the objects which are not visible by naked eyes.

magnifying glass: is used to magnifying tiny objects which are difficult to see yet they are visible.

telescope: use by space scientist to examine astronomical event that may take place in the sky which is too far.

8 0

3 years ago

Read 2 more answers

What did Bohi's model of the dom inchide that Ruthextends model did not have

Aleksandr-060686 [28]

Answer:

Electrons revolves around the nucleus in a fixed orbits with fixed energy.

electron clouds.

Explanation:

Rutherford in his model of atom explained:

Maximum space inside the atom is empty.

Electron revolves around the the center called nucleus.

Nucleus contains the positive charge.

Bohr's in his model explained that:

Electrons revolves around the nucleus in a fixed orbit named as shells.

Each orbits or shells has fixed amount of energy and size.

6 0

3 years ago