Coloca-se 500 g de ferro ( 0,1cal g º C ) a 42º C num recipiente de capacidade térmica desprezível, contendo 500 g térmico. [ 22º C ] de água ( c  1cal g º C ). Determine a temperatura final do equilíbrio

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

Why do astronauts in the space shuttle weigh less?

On your wedding day your lover gives you a gold ring of mass 3.67 g. 48 years later its mass is 3.44 g. on the average how many atoms were abrated from the ring during each second of your marriage? the atomic mass of gold is 197 u. don't enter units