O piatra este aruncata pe verticala in jos cu viteza initiala de 3 metri pe secunda sa se calculeze viteza si distanta parcursa dupa t =3 secunde g=10metri pe secunda

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

See the attachment and solve question 5th

While carrying a heavy box up the stairs,you set the box on a step and rest. then you pick up the box and carry it to the top of the stairs. describe these actions in terms of balanced and unbalanced forces acting on the box.