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3 years ago

Which of these abiotic factors is most likely the reason some plants cannot live very close to the ocean?

1 answer:

5 0

Salty soil is the answer, plants can survive in warm climates, they use Carbon Dioxide to breathe and make oxygen, and still use whatever light that they can.

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Why solid keep their shape?

tamaranim1 [39]

Answer:

Solids can hold their shape because their molecules are tightly packed together. ... Atoms and molecules in liquids and gases are bouncing and floating around, free to move where they want. The molecules in a solid are stuck in a specific structure or arrangement of atoms

Hope this helps ☆*:. o(≧▽≦)o .:*☆

5 0

2 years ago

Read 2 more answers

If the momentum of a 1000 kg car travelling at 10 m/s was transferred completely to a 20.0 kg traffic barrier, what would the fi

denis-greek [22]

Answer:

d. 500 m/s

Explanation:

Momentum: This is the product of the mass of a body to its velocity, The S.I unit of momentum is kgm/s.

Mathematically, momentum can be expressed as,

M = mv....................... equation 1

Where M = momentum, m = mass, v = velocity

deduced from the question,

Momentum of the car = momentum of the barrier.

MV = mv ............................. Equation 1

Where M = mass of the car, V = velocity of the car, m = mass of the barrier, v = velocity of the barrier.

making v the subject of the equation,

v = MV/m........................ Equation 2

Given: M = 1000 kg, V = 10 m/s, m = 20 kg.

Substitute into equation 2

v = 1000(10)/20

v = 500 m/s.

Hence the speed of the barrier = 500 m/s

The right option is d. 500 m/s

8 0

3 years ago

An echocardiogram uses 4.4 MHz ultrasound to measure blood flow in the aorta. The blood is moving away from the probe at 1.4 m/s

Alinara [238K]

Answer:

$\Delta f=17959.2\ Hz$

Explanation:

Given:

original frequency of the wave, $f=4.4\times 10^6\ Hz$

velocity of the blood stream moving away, $v=1.4\ m.s^{-1}$

<u>Doppler shift is given as:</u>

$\frac{f}{f_o} =\frac{s+v_s}{s-v_o}$

where:

s = velocity of ultrasound in blood = $1570\ m.s^{-1}$

$v_s=$ velocity of sound source towards the observer

$v_o=$ velocity of the observer away from the source

$\frac{4.4\times 10^6}{f_o} =\frac{1570+0}{1570-1.4}$

$f_o=4396076.43\ Hz$

Therefore the shift in frequency:

$\Delta f=f-f_o$

$\Delta f=3923.56\ Hz$

7 0

3 years ago

If you double the radius of the earth and keep the mass of the earth the same, the acceleration of gravity on the surface of the

Ulleksa [173]

Even though the mass of the earth stays the same, the force gravity has on us will double because there is less space in the atmosphere for the gravity to pull anything in towards its center. Let me know if I'm correct!

5 0

3 years ago

Why can scientists ignore the gravitational force when studying the physics of an atom?

Nastasia [14]

Scientists assume the gravitational force as negligible as compared to other forces present in the an atom because its value would be very small. Gravitational force is directly proportional to the mass of an object so small mass would lead to small force as well which is true for an atom. As compared to the nuclear forces, it would have a very small value.

4 0

3 years ago