Atoroid is constructed from insulated copper wire that has diameter 1mm. the cross-sectional diameter of the toroid is 1 cm. the radius of the toroid as measured to the center of its cross-section is 10.5 cm. the resistivity of copper is 1.7 x 10-6 ω-cm.
a) how many turns are there on this toroid?
b) calculate its self-inductance.
c) what is the energy stored in the toroid for an applied potential difference
of 0.1 v ?
d) what would be the value of a capacitor that would store the same energy if it was also charged to 0.1 v ?

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Friction force is equal to the net force of the car.             fn                           |ff< ·                       |                     fgfg and fn cancel out.55 km/h is 15.2778 m/s. this is the initial velocityfinal velocity is 0 m/sfind acceleration using kinematic equationv² = v₀² + 2adsince v = 00 = v₀² + 2ada = -v₀²/(2d)a = -(15.2778 m/s)/(2 * 38m) a = -3.2418 m/s²find net force and you find friction.f = ma f = (1165 .2418 m/s²)f = 3776.7 n = ffw = ff · dw = (3776.7 n)(38 m)w = -1.4 × 10^5 jthe friction forces do 1.4 × 10^5 j of work on the car