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Nataliya [291]
4 years ago
10

As a certain object falls, its position s (in meters) above ground after t seconds is given by s(t)=20-5t^2. Whats the average v

elocity of the object on the interval from t=1 to the time .5 seconds later?? from t=1 to the time .1 seconds later?
Physics
1 answer:
denpristay [2]4 years ago
3 0
The average velocity of the object would be :

[s (1.5) - s (1)] /  0.5

= [8.75 -15] / 0.5

= 12.5 m/s

Hope this helps
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A 2.2 ohm resistor has 0.042 A of current in it. What is the potential difference across the resistor?
Mrrafil [7]
V=IxR
v =0.042x2.2
potential difference =0.0924volts
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3 years ago
Calculate the effective radiation dosage in sieverts for a 57 57 ‑kg person who is exposed to 4.2 × 10 9 4.2×109 particles of al
Rus_ich [418]

Answer:

  Dose = 5.4 10⁻⁴  Sv

Explanation:

The radiation dose absorbed by the body is 81% of the incident radiation, which is the number of particles per energy of each particle

    E = 0.81 n₀ E₀

    E = 0.81 4.2 10⁹ 0.81 6.1 10⁻¹³

    E = 2.075 10⁻³ J

Effective radiation dose

     Dose1 = n x RBE

     Dose1 = 2,075 10⁻³ 15

     Dose1 = 3.1 10⁻² REM

The effective radiation dose in sievert

          Dose = dose1 / m

          Dose = 3.1 10⁻² / 57

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6 0
4 years ago
Which of these will have the same units of pressure is multiplied by area? Velocity time force or pressure
choli [55]

Considering the definition of pressure, force will have the same units of pressure is multiplied by area.

<h3>What is pressure</h3>

Pressure is defined as the force exerted per unit area.

In this way, for the same force, the pressure is inversely proportional to the surface: this means that, for the same force, the smaller the surface, the greater the pressure exerted and the more the body will be deformed.

That is, pressure is defined as the force exerted perpendicularly on a surface and is expressed mathematically as:

Pressure=\frac{Force}{Area}

In the International System of Units, the unit of pressure is the pascal (Pa). One pascal is the pressure exerted by a force of 1 N distributed over an area of ​​1 m².

Then, the definition of force can be expressed as:

Force= Pressure× Area

<h3>Summary</h3>

In summary, force will have the same units of pressure is multiplied by area.

Learn more about pressure and force:

brainly.com/question/14874331

brainly.com/question/13182194

brainly.com/question/11799608

brainly.com/question/15384427

#SPJ1

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Rays of light strike a bumpy road and are reflected.
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Answer:

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