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AlexFokin [52]
3 years ago
13

What are two harmful and two beneficial microorganisms

Physics
2 answers:
Vanyuwa [196]3 years ago
4 0
Genetically modified organisms and something else
marissa [1.9K]3 years ago
4 0
E. Coli can also be harmful if food or water is contaminated with it and then eaten.
Listeriosis can cause individuals to become very ill and can even be potentially deadly. Examples of where it can be found are in shellfish, cold cuts, and unpasteurized milk.
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In order for the ball to be able to make a complete circle around the peg, there must be sufficient speed at the top of its arc
Vesna [10]

Answer:

Explanation:

Let T be the tension in the swing

At top point mg-T=\frac{mv^2}{r}

where v=velocity needed to complete circular path

r=distance between point of  rotation to the ball center=L+\frac{d}{2} (d=diameter of ball)

Th-resold velocity is given by mg-0=\frac{mv^2}{r}

To get the velocity at bottom conserve energy at Top and bottom

At top E_T=mg\times 2L+\frac{mv^2}{2}

Energy at Bottom E_b=\frac{mv_0^2}{2}

Comparing two as energy is conserved

v_0^2=4gr+gr

v_0^2=5gr

v_0=\sqrt{5gr}

v_0=\sqrt{5g\left ( \frac{d}{2}+L\right )}

6 0
3 years ago
A 10 m long glider with a mass of 680 kg (including the passengers) is gliding horizontally through the air at 30 m/s when a 68
timama [110]

Answer:

 v = 30.39 m/s

Explanation:

given,

mass of glider,M = 680 Kg

mass of the skydiver, m = 68 Kg

horizontal velocity,V = 30 m/s

when skydiver releases, velocity,v = 30 m/s

velocity if the glider,v' =  ?

use the conservation of momentum

M V = m' v' +  m v

m' = 680-68 = 612 Kg

680 x 30 = 612 x v + 60 x 30

612 v = 18600

 v = 30.39 m/s

since the skydiver's speed will be the same as before release

The glider should continue to travel at 30.39 m/s since there are no external forces acting on it

5 0
3 years ago
A 790N person runs up a flight of 40 stairs (.25m for each step) in 20 seconds, and then down 10 steps in 5 seconds. How much to
Romashka [77]

A person runs up 40 stairs and then come down 10 steps

So total stairs upwards is given as

N = 40 - 10 = 30

now here we will have total height reached

H = N\times h

H = 30 \times 0.25 = 7.5 m

Now total energy used or mechanical work done is

W = mgH

W = 790 \times 7.5 = 5925 J

Now the mechanical power is given as

P = \frac{W}{t}

P = \frac{5925}{20+ 5} = 237 W

7 0
3 years ago
How much heat is needed to raise the temperature of 5g of water by 20oC?
Ratling [72]
Required Heat = Q

Q = Mass * specific heat of water * change in temp.

Q = 5g * 1g/cal*degC * 20degC

Q = 100 cal of heat is required

To convert calories to Joules,
1 cal = 4.184 Joules

100cal = 418.4 J of heat is needed
5 0
3 years ago
Economic growth as measured by gross domestic product does not really tell us much about citizens' general well-being. Consider
kotegsom [21]

Answer:

b

i remember this question from when i had a test to take.

4 0
3 years ago
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