During surgery or when a patient has suffered a cardiac arrest or stroke, lowering the body temperature will reduce the amount of oxygen needed by the body. Some methods used to lower body temperature include cooled saline solution, cool water blankets, or cooling caps worn on the head. How many kilojoules are lost when the body temperature of a surgery patient with a blood volume of 5500 mL is cooled from \( 38.5^{\circ} \mathrm{C} \) to \( 33.2^{\circ} \mathrm{C} \) ? (Assume that the specific heat and density of blood are the same as for water.)

Write what the core of transformer is. Explain the mutual induction process.

A straight wire carrying current placed perpendicular to a magnetic field is moved: (A) From strong magnetic flux density to weak magnetic flux density. (B) From weak magnetic flux density to strong magnetic flux density. (C) Due to the material of the straight wire. (D) Random motion doesn't depend on the magnetic flux density.

Write the advantage of rectifier in an electric circuit. Write what the core of transformer is.

A body weighs 3.1 N in air and 2.2 N when completely immersed in water of density \( 1000 \mathrm{~kg} / \mathrm{m}^{3} \). Calculate the volume of the body. Take the gravitational acceleration as \( 9.81 \mathrm{~m} / \mathrm{s}^{2} \).

Un'auto da corsa ha una massa di 800 kg . Parte da ferma e percorre 35 m in \( 3,0 \mathrm{~s} \), accelerando costantemente per tutto il tempo. Trascura l'attrito. - Quanto vale la forza esercitata dai motori dell'auto nell'intervallo di tempo dato? \( \left[6,2 \times 10^{3} \mathrm{~N}\right] \)