Oi gente, alguém me ajuda por favor em uma questão sobre gases ideais:

10 kg de um gás ideal monoatômico está confinado em um recipiente de paredes adiabáticas que possui um pistão móvel de 200 cm2 de área e massa desprezível submetido a uma pressão externa de 1 atm. sendo o volume total do recipiente 3l à 20◦c, responda:
(a) qual a densidade inicial deste gás?

um aquecedor localizado no interior do recipiente eleva a temperatura
até 70◦c. calcule:
(b) o volume final do gás
(c) o trabalho por ele realizado
(d) a quantidade de calor fornecido ao gás
(e) a variação da energia interna

What is the mass of the same rock on the earth

Física: un futbolista patea hacia el arco con una velocidad de 15m/ah, calcular: a)el alcance para un ángulo de tiro de 25? , b) el tiempo que el balón permanece en el aire.

Aheat engine running backward is called a refrigerator if its purpose is to extract heat from a cold reservoir. the same engine running backward is called a heat pump if its purpose is to exhaust warm air into the hot reservoir. heat pumps are widely used for home heating. you can think of a heat pump as a refrigerator that is cooling the already cold outdoors and, with its exhaust heat qh, warming the indoors. perhaps this seems a little silly, but consider the following. electricity can be directly used to heat a home by passing an electric current through a heating coil. this is a direct, 100% conversion of work to heat. that is, 19.0 \rm kw of electric power (generated by doing work at the rate 19.0 kj/s at the power plant) produces heat energy inside the home at a rate of 19.0 kj/s. suppose that the neighbor's home has a heat pump with a coefficient of performance of 4.00, a realistic value. note: with a refrigerator, "what you get" is heat removed. but with a heat pump, "what you get" is heat delivered. so the coefficient of performance of a heat pump is k=qh/win. an average price for electricity is about 40 mj per dollar. a furnace or heat pump will run typically 200 hours per month during the winter. what does one month's heating cost in the home with a 16.0 kw electric heater? what does one month's heating cost in the home of a neighbor who uses a heat pump to provide the same amount of heating?