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sweet [91]
3 years ago
9

1 point

Physics
1 answer:
klio [65]3 years ago
8 0

Answer:

0

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100 g

0

100

200

300

400

500

8

9

108

Explanation:

ikkk

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A horse was grazing at the top of a small hill. The horse got thirsty and ran toward a
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Answer:

I think it may be decreased, but i'm in 6th grade so-

Explanation:

7 0
3 years ago
In general, if a sound has intensity of β dB at 1 m from the source, at what distance from the source would the decibel level de
Tpy6a [65]

Answer: The required distance is given by

r_2=1\text{ m}\cdot 10^\frac{\beta}{20}.

Explanation: The sound intensity in dB is given by the formula

\beta \text{ dB}=10\log\frac{I}{I_0}

where I_0 is the hearing threshold in absolute units and I is the absolute intensity of the sound which depends on the distance. In general, for two distances r_1 and r_2 we have that

\frac{I(r_1)}{I(r_2)}=\frac{r_2^2}{r_1^2}=\left(\frac{r_2}{r_1}\right)^2.

Now let us take r_1=1\text{ m} and let r_2 be the required distance. We have

\beta \text{ dB}=10\log\frac{I(r_1)}{I_0},\quad 0\text{ db}=10\log\frac{I(r_2)}{I_0}.

Exponentiating these equations we obtain

10^{\frac{\beta}{10}}=\frac{I(r_1)}{I_0},\quad 10^0=1=\frac{I(r_2)}{I_0}.

Dividing them

\frac{I(r_1)}{I(r_2)}=10^\frac{\beta}{10}.

Using the previously stated identity

\frac{r_2^2}{r_1^2}=10^\frac{\beta}{10}\Rightarrow r_2=r_110^\frac{\beta}{20}=1\text{ m}\cdot 10^\frac{\beta}{10}

Now if we use the given example where \beta=11 we have

r_2=1\text{ m}\cdot 10^{\frac{11}{20}}=3.55\text{ m}.

7 0
3 years ago
Why are we able to use nuclear energy for practical purposes? The reactions are controlled to regulate energy output. The reacti
musickatia [10]

Answer: The reactions are controlled to regulate energy output

Explanation:

Nuclear energy is produced when either two nuclei fuse to produce larger nucleus or a bigger nuclei splits into two smaller nucleus.

Uranium easily splits to produce nuclear energy. The reactions are controlled and energy output can be regulated. Nuclear energy in abundant yet controlled amount is available. Nuclear energy is mostly used in steam turbines to produce electricity.  

5 0
4 years ago
Read 2 more answers
A girl exerts a horizontal force of 109 N on a crate with a mass of 31.2 kg. HINT (a) If the crate doesn't move, what's the magn
vesna_86 [32]

Answer:

(a) Magnitude of static friction force is 109 N

(b) Minimum possible value of static friction is 0.356

Solution:

As per the question;

Horizontal force exerted  by the girl, F = 109 N

Mass of the crate, m = 31.2 kg

Now,

(a) To calculate the magnitude of static friction force:

Since, the crate is at rest, the forces on the crate are balanced and thus the horizontal force is equal to the frictional force, f:

F = f = 109 N

(b) The maximum possible force of friction between the floor and the crate is given by:

f_{m} = \mu_{s}N

where

N = Normal reaction = mg

Thus

f_{m} = \mu_{s}mg

For the crate to remain at rest, The force exerted on the crate must be less than or equal to the maximum force of friction.

f\leq f_{m}

f \leq \mu_{s}mg

109 \leq \mu_{s}\times 31.2\times 9.8

\mu_{s}\geq 0.356

7 0
3 years ago
How do gases respond to changes in pressure and temperature?
kakasveta [241]
They compress or expand depending on amount of pressure or depending on the temperature
6 0
3 years ago
Read 2 more answers
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