A student applies a 60 n force at an angle of 60 degrees below the horizontal to a 45 kg box. If the coefficient of kinetic friction is 0.4, what is the acceleration of the box?

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