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Drupady [299]
2 years ago
6

A 1kg object at the surface of the earth weighs 9.8N. (F=ma) Prove this by using the formula Fg = Gmm/r2. (Find the radius and t

he mass of the earth on the internet.)
Physics
1 answer:
Nadusha1986 [10]2 years ago
7 0

Answer:

form radius \\

g=Gm/r2

9.8=

Explanation:

9.8 = (6.67 \times 10  ^{ - 2}  \times 1kg)  \div r  \ r  = 6.806 \times 10  ^{ - 12}  \\ r = 2.6 \times 10 ^{ - 6}

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On a good night, the front row of the Twisted Sister concert would surely result in a 120 dB sound level. An IPod produces 100 d
cricket20 [7]

Answer:

100 iPods

Explanation:

The deciBell scale is logarithmic, and thus, it turns multiplying into adding.

Initially, it was the Bell scale, purely logarithmic, where "times 10" is translated into "plus 1" (just like normal logs). However, the steps became too big and so they divided the Bell in 10 parts, the deciBell.

The levels above could well have been called 10B and 12B.

Usually, we define the dB scale for intensity as:

I(dB) = 10•log(I)

Thus,

I = 10^(I(dB)/10)

Now 120 dB gives us units of I = 10^(120/10) = 10^12 Pa (assume the dB are measured to 1 Pa) and 100 dB is 10^10 Pa.

Thus, we would need 100 ipods to get the same intensity

8 0
3 years ago
Why is it important for scientists to replicate each other’s experiments?
Vilka [71]

Explanation:

to determine if important scientific results are repeatable

6 0
2 years ago
Read 2 more answers
What are the effects of overpopulation on a specific species in an ecosystem?
bagirrra123 [75]

Tere would be too many so there would be more fighting. Thye could overpopulate the world and destroy our stuff for example if it is a pig they can easily destory crops. We would all have to go hunting. There would also be less food so that is why they would start going out and destroying stuff.

5 0
3 years ago
Read 2 more answers
A gas in a closed container is heated with 12J of energy, causing the lid of the container to rise 3m with 5N of force. What is
levacccp [35]

Answer:

27J

Explanation:

From conservation of Thermal energy, the total internal energy is the total sum of energy supplied or taken from the system plus work done for or on the system.

Now the change in internal energy would be the sum of the received energy substended in the gas plus the work done by the system which is workdone that it will sustend in pushing the lid. This is expressed mathematically as;

U = Q + (F×d);

U- change in internal energy

Q is the energy received by the system and is positive when energy is received by the system.

Fxd is the workdone and is positive since the gas pushes up the lid- the system does work.

U=12+(3×5)= 27J

5 0
2 years ago
3. A 5 gm/100 ml solution of drug X is stored in a closed test tube
JulijaS [17]

Answer:

See explanation

Explanation:

The degradation of the drug is a first order process;

Hence;

ln[A] = ln[A]o - kt

Where;

ln[A] = final concentration of the drug

ln[A]o= initial concentration of the drug = 5 gm/100

k= degradation constant = 0.05 day-1

t= time taken

When [A] =[ A]o - 0.5[A]o = 0.5[A]o

ln2.5 = ln5 - 0.05t

ln2.5- ln5 = - 0.05t

t= ln2.5- ln5/-0.05

t= 0.9162 - 1.6094/-0.05

t= 14 days

b) when [A] = [A]o - 0.9[A]o = 0.1[A]o

ln0.5 = ln5 -0.05t

t= ln0.5 - ln5/0.05

t= -0.693 - 1.6094/-0.05

t= 46 days

5 0
3 years ago
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