All categories

2 years ago

How does water get to the tops of the tallest trees against the force of gravity

2 answers:

4 0

Water gets to the leaves in the tops of the tallest trees by something called the cohesion-tension theory. Water has two very unique properties called adhesion and cohesion. Cohesion is the tendency of water molecules to stick together with one another. The water sticks together, leaving no room for air, strengthening the "force" of the water going up the tree. The water also sticks to the sides of the xylem inside the tree. In addition to these properties, there are also the factors of negative and positive water potential. For more information, look up more details of the cohesion-tension theory.

tatyana61 [14]2 years ago

4 0

You might be interested in

What is cos(33°)? A. 0.33 B. 0.84 C. 0.53 D. 0.65

Sav [38]

The answer would be b 0.84

8 0

2 years ago

The space shuttle fleet was designed with two booster stages. if the first stage provides a thrust of 53 kilo-newtons and the sp

lidiya [134]

To solve this problem we will apply Newton's second law, which indicates that the force is equivalent to the product between mass and acceleration, so

$F = ma$

Here,

F= Force

m = Mass

a = Acceleration

Rearranging to find the mass we have,

$m = \frac{F}{a}$

The value of the acceleration is

$a = 18miles/hour^2 (\frac{0.00012417m/s^2}{1 miles/hour^2})$

$a = 0.002235m/s^2$

Replacing to find the mass,

$m = \frac{53kN}{0.002235m/s^2}$

$m = \frac{53*10^{-3}}{0.002235}$

$m = 23.71kg$

Now in ponds this value is

$m = 23.71kg(\frac{2.205lb}{1kg})$

$m=52.8 lb$

Therefore the mass of the spacecraft is 52.8lb

4 0

2 years ago

A+B A=3i+4j-k B=5i+6j+2k

OlgaM077 [116]

$\text{Given that,}\\\\\vec A =3 \hat i + 4 \hat j - \hat k ~ \text{and}~ \vec B = 5\hat i + 6 \hat j +2 \hat k \\ \\\text{Now,}\\\\\vec A + \vec B = 3 \hat i +4 \hat j - \hat k + 5 \hat i + 6 \hat j + 2 \hat k\\\\~~~~~~~~~~=8 \hat i +10 \hat i + \hat k$

7 0

1 year ago

I don't understand it asking me what the earth look like when the moon is a new moon

wariber [46]

Explanation:

From a new Moon, when the Moon is situated in orbit between the Earth and the Sun with its dark side in shadow facing towards us, the amount of lunar surface visible from the Earth increases through waxing crescent, first quarter and waxing gibbous phases until it becomes full.

The new moon is the phase that is invisible to us here on Earth because the moon is between the earth and the sun, and its illuminated side is facing away from us. A solar eclipse occurs when the moon moves in front of the sun, blocking it from our view on Earth.

6 0

3 years ago

Read 2 more answers

A horizontal platform in the shape of a circular disk rotates on a frictionless bearing about a vertical axle through the center

Bess [88]

Answer:

10.93 rad/s

Explanation:

If we treat the student as a point mass, her moment of inertia at the rim is

$I_r = mr^2 = 67.8*3.7^2 = 928.182 kgm^2$