.- Una rueda de 50cm de diámetro, partiendo del reposo tarda 10 segundos en adquirir una velocidad de 360rpm. a) Calcula la aceleración angular y tangencial del movimiento

a = 1,885 m / s²,  α = 3.77 rad / s²

Explanation:

This is an exercise in angular kinematics

           w = w₀ + α t

as part of rest w₀ = 0

          w = α t

          α = w / t

Let's reduce the magnitudes to the SI system

            w = 360 rpm (2π rad / 1 rev) (1min / 60s) = 37.7 rad / s

            r = 50 cm = 0.50 m

let's calculate

           α = w / t

            α = 37.7 / 10

            α = 3.77 rad / s²

angular and linear variables are related

           a =  α r

           let's calculate

           a = 3.77  0.50

           a = 1,885 m / s²

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

i do.

explanation:

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