Dois corpos, A e B, de massas diferentes (mA = 3 mB) foram lançados verticalmente para cima com velocidades iniciais diferentes. Um deles (A) atingiu uma altura quatro
vezes maior do que o outro (B). Desprezando as resistências impostas ao movimento,
quantas vezes é a sua velocidade inicial superior a do outro?
a) V0(A) = 2 V0(B)
b) V0(A) = 4 V0(B)
c) V0(A) = V0(B)
d) V0(B) = 2 V0(A)
e) V0(B) = 4 V0(A)

Electroplating is a way to coat a complex metal object with a very thin (and hence inexpensive) layer of a precious metal, such as silver or gold. in essence the metal object is made the cathode of an electrolytic cell in which the precious metal cations are dissolved in aqueous solution. suppose a current of 480.ma is passed through an electroplating cell with an aqueous solution of agno3 in the cathode compartment for 46.0 seconds. calculate the mass of pure silver deposited on a metal object made into the cathode of the cell. round your answer to 3 significant digits. also, be sure your answer contains a unit symbol. ×10μ

How does a circuit breaker protect a refrigerator? a. when the current is too high, a metal strip in the fuse melts and opens the circuit. b. when the resistance is too high , a re-settable which opens a circuit c. when the current is too high , a re-settable switch opens the circuit d. when the resistance is too high a metal strip in the fuse melts and opens the circuit

Why does the equilibrium position of the spring change when a mass is added to the spring? will the mass oscillate around the new equilibrium position of the spring or the previous position without a mass attached to the spring? if the equilibrium position of the spring changes by 20 cm (assuming no initial mass) when a mass is added to the spring with constant 4.9 kg/s^2, what is the mass of the object attached to the spring?