Determine o calor específico em cal/g°C de uma substância com massa de 2 kg que, ao receber 6000 cal de calor de uma fonte térmica, teve a sua temperatura elevada em 30 °C

An air-filled capacitor is formed from two long conducting cylindrical shells that are coaxial and have radii of 26 mm and 103 mm. the electric potential of the inner conductor with respect to the outer conductor is - 700 v (k = 1/4πε 0 = 8.99 × 109 n · m2/c2) the energy stored in a 1.0-m length of this capacitor is closest to