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2 years ago

What do fertilisers contain that make plants and algae grow faster

Physics

1 answer:

tresset_1 [31]2 years ago

7 0

Answer:

it contains nitrogen, potassium and phosphorus

Explanation:

the fertilisers contain nitrogen potassium and phosphorus . this makes the plants and algae grow faster.

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2. How many grams of water can be heated from 20.0°C to 75°C using<br><br><br> 12500.0 Joules?

bogdanovich [222]

Answer:

Grams of water can be heated from 20.0°C to 75°C using 12500.0 Joules = 54.3 g

Explanation:

Heat required to increase temperature

H = mcΔT

m = mass of material

C = specific heat of material

ΔT = Change in temperature.

Here we need to find how many grams of water can be heated from 20.0°C to 75°C using 12500.0 Joules

That is

H = 12500 J

Specific heat of water, C = 4186 J/kg°C

ΔT = 75 - 20 = 55

Substituting

12500 = m x 4186 x 55

m = 0.0543 kg

m = 54.3 g

Grams of water can be heated from 20.0°C to 75°C using 12500.0 Joules = 54.3 g

3 0

2 years ago

A. Blue light has higher energy than red light. Write 3 - 4 sentences comparing these electromagnetic waves with respect to the

frosja888 [35]

PART A)

As we know that energy of light depends on its wavelength and frequency as following formula

$E = \frac{hc}{\lambda} = h\nu$

now we know that wavelength of blue light is less than the red light so here energy of blue light will be more

also we know that

$\nu = \frac{c}{\lambda}$

so here if wavelength is smaller for blue light so its frequency will be high and the speed of both light will be same in same medium

PART B)

Since we know that frequency of blue light is more than red light as well as wavelength of blue light is less than the wavelength of blue light so here blue light will have more energy

When blue light and red light strike the metal surface then due to more energy of blue light it will release some loosely bonded electrons from metal surface which will contribute in current.

here if we increase the intensity of light then the number of photons that contain the blue light of certain energy will be more and that will contribute more current

So here quantification help as we know that due to quantization only certain frequency or energy will lead to eject electron so all colours will not give this current

5 0

2 years ago

Read 2 more answers

21. A person standing 49.5m from the foot of a cliff claps his hands and hears an echo 0.3

777dan777 [17]

Answer:

330 m/s

Explanation:

The sound wave has to travel TO the cliff AND back = 2 * 49.5 = 99 m

magnitude of velocity = distance / time = 99m / .3 s = 330 m/s

5 0

1 year ago

Why are there two fluoride ions in magnesium fluoride but only one fluoride ion in lithium fluoride

postnew [5]

This would be more of a chemistry question. Remember magnesium has a charge of 2+, and would need to hand off its two extra electrons. Fluorine can only take one electron at a time, so there needs to be two fluorines to take one magnesium's 2 electrons.

With lithium, it has a +1 charge, so it has one extra electron, which it can hand off to just 1 fluorine atom.

Another way of looking at this is: $Mg^{2+}$ + 2 $F^{-}$ = MgF2 (the charges must balance out to zero)

$Li^{+}$ + $F^{-}$ = LiF (the charges balance out to zero)

5 0

2 years ago

Read 2 more answers

Car 1 goes around a level curve at a constant speed of 65 km/h . The curve is a circular arc with a radius of 95 m . Car 2 goes

Arte-miy333 [17]

Answer:

The radius of the curve that Car 2 travels on is 380 meters.

Explanation:

Speed of car 1, $v_1=65\ km/h$

Radius of the circular arc, $r_1=95\ m$

Car 2 has twice the speed of Car 1, $v_2=130\ km/h$

We need to find the radius of the curve that Car 2 travels on have to be in order for both cars to have the same centripetal acceleration. We know that the centripetal acceleration is given by :

$a=\dfrac{v^2}{r}$

According to given condition,

$\dfrac{v_1^2}{r_1}=\dfrac{v_2^2}{r_2}$

$\dfrac{65^2}{95}=\dfrac{130^2}{r_2}$

On solving we get :

$r_2=380\ m$

So, the radius of the curve that Car 2 travels on is 380 meters. Hence, this is the required solution.

4 0

3 years ago