Dale and alex push on opposite sides of a couch. dale pushes to the left with
a force of 100 n, while alex pushes to the right with a force of 175 n. if the
couch has a mass of 55 kg, what is the acceleration of the couch?
o a. 5 m/s2 right
o b. 5 m/s2 left
o c. 1.4 m/s? right
o d. 1.4 m/s2 left
submit

C. 1.4 m/s² right

Explanation:

Apply Newton's second law.  Take right to be positive and left to be negative:

∑F = ma

175 N − 100 N = (55 kg) a

a = 1.4 m/s²

The couch accelerates to the right at 1.4 m/s².

96.10 A

Explanation:

The capacitor is connected to a voltage source defined by the expression,

V(t) = √2 × Vrms×sin2πft

Where V(t)=instantaneous voltage, Vrms= root mean square voltage value, f= frequency, t= time π=pi.

Vrms= 120 V, f= 60.0Hz, t= 1/171s, π= 3.143.

∴ V(t) = √2 × 120 × sin(2×3.143×60×t)

∴V(t) = 169.71 × sin(377.16t)(1)

using capacitor's equation,

I(t)=C(dv/dt)(2)

Note: the differentiation of sin∅ = cos∅

∴ dv/dt=169.71×377.16×cos(377.16t)

  dv/dt = 64109.65× cos(377.16t)

  At time t=1/171s.

 ∴dv/dt=64109.65 × cos(377.16×1/171)

   dv/dt = 64109.65 ×cos(2.21)

   dv/dt = 64109.65 × 0.999

   dv/dt = 64045.54.

    I(t) = C(dv/dt)

   Where C= I.5 mF = 0.0015 F

   ∴ I(t) = 0.0015 × 64045.54

      I(t) = 96.07

      I(t) ≈ 96.10 A