A heat engine takes in $800 J$ of heat and does $200 J$ of useful work. What is its efficiency?

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How much energy is needed to heat $0.50 kg$ of water from $2 0^{\circ} C$ to $6 0^{\circ} C$ ? (Specific heat capacity of water…
A sealed rigid container holds gas at $2.0 \times 1 0^{5} Pa$ and $300 K$ . The gas is heated to $600 K$ . What is the new p…
A gas occupies $0.0249 m^{3}$ at $1.0 \times 1 0^{5} Pa$ and $300 K$ . How many moles are present? ( $R = 8.31 J/mol K$ )
A fixed mass of gas at constant pressure is heated from $2 7^{\circ} C$ to $12 7^{\circ} C$ . What is the ratio of the final volume to…
How much energy is needed to melt $0.20 kg$ of ice already at $0^{\circ} C$ ? (Specific latent heat of fusion of ice…
A gas at $100 kPa$ occupies $6.0 litres$ . It is compressed at constant temperature to $2.0 litres$ . What is the new pre…