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Laasya accurately explains to Clark the role of decomposers in an ecosystem. Choose the sentences that she should include in her

Brrunno [24]

The Sentences which should Include in Laasya Explanation are :

B. Decomposers breakdown Dead Organisms.

D. Decomposers help to recycle Nutrients in an Ecosystem.

Because :

✿ Plants are Producers, But not Decomposers

✿ Ecosystems cannot function without Decomposers.

✿ Decomposers do not include Producers

3 0

3 years ago

A block is at rest on the incline shown in the gure. The coefficients of static and kinetic friction are 0.6 and 0.51, respec- t

Alekssandra [29.7K]

Normal reaction force on the block while it is at rest on the inclined plane is given as

$F_n = mgcos\theta$

here we know that

m = 46 kg

$\theta = 29^o$

now we will have

$F_n = 46*9.8*cos29 = 394.3 N$

now the limiting friction or maximum value of static friction on the block will be given as

$F_s = \mu_s * F_n$

$F_s = 0.6 * 394.3 = 236.56 N$

Above value is the maximum value of force at which block will not slide

Now the weight of the block which is parallel to inclined plane is given as

$F_{||} = mg sin\theta$

here we know that

$F_{||} = 46*9.8 sin29 = 218.55 N$

Now since the weight of the block here is less than the value of limiting friction force and also the block is at rest then the frictional force on the block is static friction and it will just counter balance the weight of the block along the inclined plane.

So here friction force on the given block will be same as its component on weight which is 218.55 N

5 0

3 years ago

Work output of a large machine in a factory is 89,000 joules, and it’s input is 102,000 joules. Work output of a similar machine

mojhsa [17]

(89000/102000)×100
=87.25%

(92000/104000)×100
=88.46%

efficiency is (output/input)×100
if u get confused which way input and output should go, remember the smaller value is always output and it's above in the fraction, then only it's possible to get a efficiency lower than 100.

7 0

3 years ago

Read 2 more answers

How many shells does the element neon have? A.1 B.2 C.8 D.18

ZanzabumX [31]

The answer should be B.

Hope it helped you.

7 0

3 years ago

Read 2 more answers

Find the de Broglie wavelength of an electron with a speed of 0.78c. Take relativistic effects into account.

Liono4ka [1.6K]

Answer:

de Broglie wavelength of an electron with speed 0.78 c taking relativistic effects into account is given as:

λ = 1.943 * 10^(-12) m

Explanation:

Given:

v = 0.78 c

we know:

c = speed of light = 3 * 10^8 m/s

mass of electron = m = 9.1 × 10-31 kg

de Broglie wavelength:

In 1924 a French physicist Louis de Broglie assumed that for particles the same relations are valid as for the photon:

(Dual-nature of a particle)

Let the wavelength be = λ

According to de Broglie:

λ = h/p = h/mv

where h is planck's constant = 6.626176 x 10^-34 Js

and p is momentum.

Taking relativistic effects into account, we know that the momentum of the particle changes by a factor 'γ'.

At low speed, γ is almost 1. However, at very high velocity (comparable to light), it has a great effect on momentum.

γ = $\frac{1}{\sqrt{1-\frac{v^{2} }{c^{2} } } }$

γ = 1.6

Now at 0.78 c, considering relativistic effects, we know:

λ = h/γp = h/γ*mv

= (6.62 x 10^(-34))/(1.6*0.78*3*10^(8)*9.1 × 10-31

λ = 1.943 * 10^(-12) m

4 0

3 years ago