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3 years ago

I have to get this done today

1 answer:

3 0

It is simply a question of the amount of water contained, a lake is much bigger than a pool. The energy ratio is just the ratio of the masses of water concerned. <span>Thermal energy is the total kinetic energy of the particles in a substance .</span>The lake is larger, so it contains more total particles than the swimming pool. The thermal energy of a lake is greater than a swimming pool because the lake is larger.

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What type of star has a low temperature and a low luminosity?

Brrunno [24]

Answer:

Explanation:

the higher up on the Main Sequence the star is, the shorter it lives. The smaller main sequence stars have low luminosities and low surface temperatures. These stars take a very long time to fuse hydrogen into helium and will therefore live a very long life.

8 0

3 years ago

Capillary action in trees can transport water from the roots to the tree's branches. The capillaries (Xyelem) in a certain tree

lesantik [10]

Answer:

$h=14.2857\,m$

Explanation:

Given:

radius of capillary, $r=10^{-6}\,m$

angle of contact, $\theta=0^{\circ}$

density of water, $\rho=1000\,kg.m^{-3}$

surface tension of water, $T=0.07 \,N.m^{-1}$

height, h = ?

We have the equation for the height of meniscus as:

$h=\frac{2T.cos\, \theta}{\rho.g.r}$

$h=\frac{2\times 0.07\times cos\,0^{\circ}}{1000\times 9.8\times 10^{-6}}$

$h=14.2857\,m$

No, the capillary action alone cannot be the mechanism of water transportation to the top of the trees. Transpiration also creates a suction pressure in the xylem complementary to the ascent of sap and cohesion of water being the other causes of movement of water up in the plants.

6 0

3 years ago

A crane used 250,000 Joules of work to move a beam to the top of a building in 20 seconds. How much power did the crane use?

maria [59]

Answer:

12500W

Explanation:

Given parameters:

Work done = 250000J

Time taken = 20s

Unknown:

Power of the crane = ?

Solution:

Power is the defined as the rate at which work is being done;

Mathematically;

Power = $\frac{work done}{time }$

insert the parameters and solve;

Power = $\frac{250000}{20}$ = 12500W

7 0

3 years ago

A star has a spectrum shift exhibiting a red shift. What can you conclude about the distance from earth to that star

Akimi4 [234]

Red shift in the spectrum of a star is always taken to mean that the source of the light is moving away from us.

That's the whole basis for the notion of the expanding universe, since we don't know of any other mechanism that can shift light toward longer wavelengths.

6 0

3 years ago

Read 2 more answers

An oil droplet is levitated and held at rest in a region where the electric field is 1.4x104 N/C directed vertically downwards.

Ratling [72]

W = m g weight of drop

W = q E

m = q E / g = = 3 e E / g

m = 3 * 1.6E-19 * 1.4E4 / 9.8 = 6.96E-16 kg

8 0

3 years ago