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mestny [16]
2 years ago
11

A current of 1.8 A delivers 2.5 C of charge.

Physics
2 answers:
Verdich [7]2 years ago
7 0

Answer:

<em>1.4 seconds</em><em>,</em><em> </em>which is the third option

Explanation:

Current is defined as the flow of charge per time

Therefore, the equation that relates current, charge and time can be expressed as follows:

I = ΔQ / ΔT

where:

I is the current given = 1.8 ampere

ΔQ is the charge given = 2.5 coulomb

Δt is the time required for the flow of the given charges to give the 1.8 ampere.

Substitute with the givens in the above equation to get the time as follows:

1.8 = 2.5 / ΔT

ΔT = 2.5 / 1.8 = 1.38888 which is approximately 1.4 seconds

I am Lyosha [343]2 years ago
4 0

" 1.8 Ampere " means "1.8 Coulomb/sec".

(2.5 C)/(1.8 C/sec) = (2.5/1.8) (s) = <em>1.39 sec </em>

I honestly don't see where any of the choices comes from, but the closest one is (C) 1.45 sec.

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A centrifuge is a device used to separate materials by their masses. A sample in a centrifuge is rotated at high speeds along a
german

Answer:

 F = 1.047 10⁻² N

Explanation:

Let's use kinematics to find the angular acceleration

             w = w₀ + α t

as for rest w₀ = 0

             w = α t

             α = w / t

let's reduce the magnitudes to the SI system

              w = 1000 rev / min (2π rad/ 1 rev) (1 min/ 60s) = 104.72 rad / s

              m = 1.00 g (1 kg / 1000 g) = 1,000 10⁻³ kg

              r = 10.0 cm (1 m / 100 cm) = 0.100 m

let's calculate

              α = 104.72 / 1

              α = 104.72 rad / s²

angular and linear variables are related

               a = α  r

               a = 104.72 0.100

               a = 10.47 m / s²

finally we substitute in Newton's second law

               F = 1 10⁻³ 10.47

               F = 1.047 10⁻² N

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