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pychu [463]
3 years ago
14

Mass and Weight: What is the mass of an object that experiences a gravitational force of 685 N near Earth's surface where g

Physics
1 answer:
11Alexandr11 [23.1K]3 years ago
4 0

Answer:

m = 69.9 kg

Explanation:

The mass and the weight of an object are two different quantities. Mass is basically the amount of matter that is present in a body. It remains same everywhere in the universe and measured in kilograms.

Weight is basically a force. It is the force by which earth attracts everything towards itself. The weight of an object changes from planet to planet, with the change in value of the gravitational acceleration (g).

Therefore, the relation between mass and weight of an object is given by the following formula:

W = mg

m = W/g

where,

m = mass = ?

W = Weight = 685 N

g = 9.8 m/s²

Therefore,

m = (685 N)/(9.8 m/s²)

<u>m = 69.9 kg</u>

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30 seconds of exposure to 115 dB sound can damage your hearing, but a much quieter 94 dB may begin to cause damage after 1 hour
IRISSAK [1]

Answer:

39.8 m ≈ 40 m

Explanation:

power (P) = 50 W

sound intensity level (p) = 94 dB

the distance (r) can be gotten from the equation I = \frac{power}{4nr^{2} } (take not that π is shown as n)

making r the subject of the formula we have r = \sqrt{\frac{power}{4nI} }   (take not that π is shown as n)

But to apply this equation we need to get the value of the intensity (I)

  • we can get the intensity (I) from the formula sound intensity level (p) = 10 log₁₀(\frac{I}{I'})
  • rearranging the above formula we have intensity (I) = I' x 10^{\frac{p}{10} }
  • I' = reference intensity = 1 x10^{-12} W/m^{2}
  • now substituting all required values into the formula for intensity (I)
  • I = 1 x 10^{-12} x 10^{\frac{94}{10} } = 0.00251 W/m^{2}

now that we have the value of the intensity (I)  we can substitute it into the formula for the distance (r)

distance (r) = \sqrt{\frac{power}{4nI} }

r = \sqrt{\frac{50}{4x3.142x0.00251} } = 39.8 m ≈ 40 m

4 0
3 years ago
Extra Practice In Exercises 1-4, use the diagram. 1. Give two other names for CD. <br>​
lana [24]

Answer: I think it’s point cd and line cd

Explanation:

6 0
3 years ago
Electrical charges were named by? Franklin, Gilbert , van de graaff
Daniel [21]

Answer:

franklin im pretty sure??

Explanation:

, Electrical engineering from Dr. B. C. Roy Engineering College, Durgapur (2019) In the 18th century, Benjamin Franklin in America tried experiments with charges. It was Franklin who named the two kinds of electricity

4 0
3 years ago
At one instant of time a rocket is traveling in outer space at 2500m/s and is exhausting fuel at a rate of 100 kg/s. If the spee
lawyer [7]

Thrust is a reaction force described quantitatively by Newton's third law. When a system expels or accelerates mass in one direction, the accelerated mass will cause a force of equal magnitude but opposite direction on that system. Mathematically can be written as,

T = v\frac{dm}{dt}

Here,

v = speed of the exhaust gases measured relative to the rocket.

\frac{dm}{dt}= Rate of change of mass with respect to time

Our values are given as,

v = 1500m/s

\frac{dm}{dt} = 100kg/s

Replacing we have that

T = 1500*100

\therefore T = 1.5*10^5N

7 0
3 years ago
What is the frequency of a wave if the speed of the wave is 7.9m/s and the wavelength is 3.1m?​
Tpy6a [65]

Answer:

<h2>2.55 Hz</h2>

Explanation:

The frequency of the wave given it's velocity and wavelength can be found by using the formula

f =  \frac{c}{ \lambda}  \\

where

c is the velocity of the wave in m/s

\lambda is the wavelength in m

From the question

c = 7.9 m/s

\lambda = 3.1 m

We have

f  = \frac{7.9}{3.1}  = 2.548387... \\

We have the final answer as

<h3>2.55 Hz</h3>

Hope this helps you

6 0
2 years ago
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