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Vlada [557]
2 years ago
14

Hey everyone! THIS IS VERY IMPORTANT!!!!!!!! im in 8th grade and my science DBA is tomorrow and i need dba notes. its lesson 4.

PLEASE PLEASE PLEASE HELP
Physics
1 answer:
Anvisha [2.4K]2 years ago
5 0

Answer:

look on quizlet! there are tons of study sets to choose from that probably are In your curriculum!

Explanation:

question/answer

What are two types of chemical weathering?

Oxidation and acids

What are some physical forces?

Wind, water, plants, pressure change, ice

There are two types of weathering

Mechanical and chemical

Weathering is the breakdown of

Rock at or near the Earth's surface.

What are three things that rocks can tell you about?

How the earth is moving, how old it is, and about events of the past.

Minerals are

The building blocks of rocks.

What are three things about minerals?

They occur naturally, almost all of them are solid, and they are in organic-not formed from living material.

Magma is

Molten rock from the mantle layer of the Earth.

When magma cools or hardens, it is called

Igneous rock.

When magma reaches the Earth's surface as lava and then cools and hardens into rock, it is called an

Extrusive rock.

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A measure of your memory in which you need to pick the correctly learned answer from a displayed list of options is known as a m
blondinia [14]

Answer:

Recognition

Explanation:

Recognition is a cognitive process that involves a list of options being displayed.

The person involved is then told to make some selections according to the situation and the information / features gathered by the person after the encounter with the individual.

This is a good method in intelligence gathering for investigations and other important issues .

5 0
4 years ago
Read 2 more answers
Explain why elements in the same family have similar physical and chemical properties
zhenek [66]
They have similar physical and chemical properties because of thier valence electrons
5 0
3 years ago
A ball has m=10 kg and v=10 m/s. It has the same momentum as which of the following?
crimeas [40]

Answer:

Choice d. All three balls listed in choice a, b, and c have a momentum of 100\; \rm kg \cdot m \cdot s^{-1} each, same as that of the 10\; \rm kg ball moving at 10\; \rm m \cdot s^{-1}. Assumption: all four balls are moving in the same direction.

Explanation:

The momentum p of an object is equal to the product of its mass m and its velocity v.

Momentum of a 10\; \rm kg ball moving at 10\; \rm m \cdot s^{-1}:

p = m \cdot v = 10\; \rm kg \times 10\; \rm m \cdot s^{-1} = 100\; \rm kg \cdot m \cdot s^{-1}.

Similarly:

  • Momentum of the ball in choice a: 100 \; \rm kg \times 1\; \rm m \cdot s^{-1} = 100\; \rm kg \cdot m\cdot s^{-1}.
  • Momentum of the ball in choice b: 5 \; \rm kg \times 20\; \rm m \cdot s^{-1} = 100\; \rm kg \cdot m\cdot s^{-1}.
  • Momentum of the ball in choice c: 2 \; \rm kg \times 50\; \rm m \cdot s^{-1} = 100\; \rm kg \cdot m\cdot s^{-1}.

Hence the conclusion that these balls have the same momentum.

7 0
3 years ago
The aorta is approximately 25 mm in diameter. The mean pressure there is about 100 mmHg and the blood flows through the aorta at
Ksenya-84 [330]

Answer:

Explanation:

25 mm diameter

r₁  = 12.5 x 10⁻³ m radius.

cross sectional area =  a₁

Pressure P₁  = 100 x 10⁻³ x 13.6 x 9.8 Pa

a )

velocity of blood v₁ = .6 m /s

Cross sectional area at blockade = 3/4 a₁

Velocity at blockade area = v₂

As liquid is in-compressible

a₁v₁ = a₂v₂

a₁ x .6 m /s  = 3/4 a₁ v₂

v₂ = .8m/s

b )

Applying Bernauli's theorem formula

P₁ + 1/2 ρv₁² =  P₂ +  1/2 ρv₂²

100 x 10⁻³ x 13.6 x10³x 9.8 + 1/2 X 1060 x .6² = P₂ +  1/2x 1060 x .8²

13328 +190.8 = P₂ + 339.2

P₂ = 13179.6 Pa

= 13179 / 13.6 x 10³ x 9.8 m of Hg

P₂ =  .09888 m of Hg

98.88 mm of Hg

8 0
4 years ago
You and your brother argue often about how to safely secure a toddler in a moving car. You insist that special toddler seats are
sergey [27]

Answer:

Force F = 1535.86 N

the force necessary for his wife to hold onto their child during the collision is 1535.86 N

Explanation:

Given;

Mass of toddler m = 13 kg

Velocity v = 37 mi/h = 37 × 0.44704 m/s = 16.54 m/s

Impulse time t = 0.14 seconds

Using the impulse momentum equation,

Impulse = change in momentum

Ft = m(∆v)

Force F = m(∆v)/t

∆v = 16.54 m/s

F = 13×16.54/0.14

Force F = 1535.86 N

5 0
4 years ago
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