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3 years ago

Phsyical properties are

2 answers:

8 0

The answer is C. Any physical property can be observed without changing the identity of the substance. That’s one of the main things that separates a physical and chemical property.

aliya0001 [1]3 years ago

5 0

Hello!

I believe physical properties are C) Those properties which can be observed without changing the identity of the substance .

I hope it helps!

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A 19.3 kg dog is running northward at 2.98 m/s , while a 6.26 kg cat is running eastward at 3.64 m/s . Their 78.7 kg owner has t

m_a_m_a [10]

Answer:

v = 0.78 m/sec at 21.61° towards the east of north

Explanation:

Given a 19.3 kg dog is running northward at 2.98 m/s , while a 6.26 kg cat is running eastward at 3.64 m/s and the mass of the owner is 78.7 kg.

Given m(dog) = 19.3 kg and m(cat) = 6.26 kg

v(dog) = $2.98\vec{j}$ m/sec

v(cat) = $3.64\vec{i}$ m/sec

Given the $\vec{P}(owner)=\vec{P}(dog)+\vec{P}(cat)$

Let the velocity of the owner be $\vec{v}$

We know that $\vec{P}=m\vec{v}$

$m(owner)\times \vec{v}=m(dog)\times \vec{v(dog)}+m(cat)\times \vec{v(cat)}$

$78.7\times \vec{v}=19.3\times 2.98\vec{j}+6.26\times 3.64\vec{i}$

$\vec{v}=\frac{1}{78.7}(57.5\vec{j}+22.78\vec{i})$

$v=\sqrt{(\frac{57.5}{78.7})^2+(\frac{22.78}{78.7})^2 }$

v=0.78 m/sec

for direction

Tan(α)= $\frac{component of x}{component of y}$

where α is the angle toward east of north.

Tan(α)= $\frac{22.78}{57.5}$

α=21.61°

3 0

3 years ago

What physics is involved for a passenger feeling pushed backward into the seat of an airplane when it accelerates along the runw

timofeeve [1]

It's due to Inertia. The law of Inertia states that a body will try to retain its movement state if possible. This means, if a body is at rest, it will try to remain at rest using forces. Similarly, if it's in movement, it will try to remain in movement.

In this example, the plane is moving forwards, and so do the seats, which in turn push the passenger forwards.The force felt is Inertia acting on the body, trying to counter the movement.

7 0

4 years ago

Read 2 more answers

A 0.25-m string, vibrating in its sixth harmonic, excites a 0.96-m pipe that is open at both ends into its second overtone reson

Andrews [41]

Answer:

option D

Explanation:

given,

length of the pipe, L = 0.96 m

Speed of sound,v = 345 m/s

Resonating frequency when both the end is open

$f = \dfrac{nv}{2L}$

n is the Harmonic number

2nd overtone = 3rd harmonic

so, here n = 3

now,

$f = \dfrac{3\times 345}{2\times 0.96}$

f = 540 Hz

The common resonant frequency of the string and the pipe is closest to 540 Hz.

the correct answer is option D

7 0

3 years ago

The mercalli scale is a scale from ________.

Mashcka [7]

<h2>Answer: 1 to 12. </h2>

The Mercalli seismological scale is a scale of 12 degrees, where 1 is very weak and 12 catastrophic.

This scale owes its name to the Italian physicist Giuseppe Mercalli and was developed to assess the intensity of earthquakes through the effects and damages caused to different structures.

This means the Mercalli scale measures how strong a earthquake has been by its consequences and not by its magnitude, therefore it is based on empirical observations.

6 0

3 years ago

Thanks for answering

ElenaW [278]

Answer:

II) Kitchen waste: Meal leftovers, Banna peelings

Garden Waste: Camote leaves, Kangkong leaves, weeds

Factory: Glass bottles, carton pieces

III) A

IV) Home: Bottles of shampoo, leftover food, syringe

office Gloves

Classroom: containers

Laboratory: empty cartridge

5 0

3 years ago