Ask question

Ask question

All categories

3 years ago

9

Which type of disease cannot be spread from one person to another

1 answer:

aniked [119]3 years ago

7 0

I believe that would be D.

Cardiovascular disease generally refers to conditions that involve narrowed or blocked blood vessels that can lead to a heart attack, chest pain, or stroke. Which it has nothing to do with being infectious.

You might be interested in

An extended period of well-below-average temperatures is known as a

jasenka [17]

Well, I think it kinda depends on how long the "extended period" is.

If the extended period is a week, a month, or a few months,
then I'd call it a 'cold wave'.

If the extended period is like 100 years or more, then you're
starting to talk 'ice age'.

3 0

3 years ago

Read 2 more answers

Theories have both an explanatory and a predictive function. <br> a. True <br> b. False

Simora [160]

Theories have both an explanatory an a predictive function. True

3 0

3 years ago

Read 2 more answers

The Earth orbits the Sun with a period of 3.16 x 107 seconds (1 year!) at a distance of 1.5 x 1011 m. The mass of the Earth is 6

SVETLANKA909090 [29]

Answer:

a) M = 2 10³⁰ kg , b) $T_{m}$ = 5.81 10⁷ s

Explanation:

a) For this exercise let's use Newton's second law where force is the law of universal gravitation and acceleration is centripetal

G m M / R² = m a

a = v² / R

G M / R = V²

The orbit of the two planets is approximately circular, therefore the velocity module (speed) is constant

v = d / t

The distance is the length of the circular orbit

d = 2π R

G M / R = 4π² R² / T²

G M T² = 4π² R³

Let's write this equation for each planet

For the earth

The period is T = 3.16 10⁷ s and the radius of the orbit R = 1.5 10¹¹ m, let's calculate the mass of the sun

M = 4π² R³ / G T²

M = 4π² (1.5 10¹¹)³ / (6.67 10⁻¹¹ (3.16 10⁷)²)

M = 133.24 10³³ / 66.60 10³

M = 2 10³⁰ kg

b) For this part we write this equation for the two points

For the earth

$T_{E}$ ² = (4π² / G M) $R_{E}$ ³

For mars

$T_{m}$ ² = (4π² / G M) $R_{m}$ ³

Let's divide the two expressions

$T_{m}$ ² / $T_{E}$ ² = $R_{m}$ ³ / $T_{E}$ ³

They indicate that the orbit of Mars is $R_{m}$ = 1.5 $R_{E}$

$T_{m}$ ² / $T_{E}$ ² = (1.5 $R_{E}$ / $R_{E}$ )³

$T_{m}$ ² = $T_{E}$ ² 1.5³

$T_{m}$ ² = (3.16 10⁷)² 1.5³

$T_{m}$ = √ (33.70 10¹⁴)

$T_{m}$ = 5.81 10⁷ s

5 0

4 years ago

A person pushes a 10 kg box from rest and accelerates it to a speed of 4 m/s with a constant force. If the box is pushed for a t

lutik1710 [3]

The box is accelerated from rest to 4 m/s in a matter of 2.5 s, so its acceleration <em>a</em> is such that

4 m/s = <em>a</em> (2.5 s) → <em>a</em> = (4 m/s) / (2.5 s) = 1.6 m/s²

Then the force applied to the box has a magnitude <em>F</em> such that

<em>F</em> = (10 kg) (1.6 m/s²) = 16 N

7 0

3 years ago

Find what is the ratio of the internal energy of hydrogen UB. To the internal energy of helium UJ for two moles of hydrogen and

finlep [7]

Answer:

Ration of internal energy of hydrogen to the internal energy of helium is equal to $\frac{5}{6}$

Explanation:

As we know

degree of freedom of hydrogen is 5

Degree of freedom of helium is 3

Internal energy of hydrogen

$\frac{5}{2} * 2 * RT = 5 *RT$

Internal energy of helium

$\frac{3}{2} * 4 * RT = 6 *RT$

Ration of internal energy of hydrogen to the internal energy of helium is equal to $\frac{5}{6}$

4 0

4 years ago