5 João foi a uma loja comprar uma máquina fotográfica no valor de \( R \$ 500,00 \). Na hora de pagar, ele teve um desconto de \( 25 \% \).

\( 18-3 \) SPECIFIC HEATS OF A GAS The heat necessary to raise the temperature of agas depends on how the gas is confined. If the \( g^{2 s} \) is held at constant volume, as indicated in fig. 18 -la, the heat received is converted entirely into internal energy, in the form of molecular kinetic energy, thus raising the temperature. The heat per unit mass per degree required to raise the temperature of the gas under these conditions is called the specific heat at constant volume, co. When the gas is confined in a cylinder under a piston that maintains constant pressure (Fig. 18-1b), the gas will expand on being heated. It does work in moving the piston. Hence heat must be supplied to change the internal energy of the gas and to perform external work. The heat per unit mass per degree required to raise the tem- perature of the gas under constant pressure is

Un edificio de 5 metros proyecta una sombra de 4 metros. Determine la altura que tiene una casa que proyecta una sombra 2 metros.

Chooze the conert answer The groph of the function \( f(x)=\cos \left(x^{2}\right) \) in shifted 3 units to the right and tunit up. The foumalu of the mew guoph is: 1) mone of these 2) \( g(x)=\cos (\sqrt{x+2})+3 \) 3) \( g(x)=\cos \left((x-3)^{2}\right)+1 \) 4) \( g(x)=\cos \left((x-2)^{2}\right)-3 \)

10. At 1700 , a lorry left Town A for Town B. After some time, a car left Town B tor Town A. The two vehicles met at 1300 midway between the two towns. The ratio of the average speed of the car to the average speed of the lorry is \( 5: 4 \). (a) What time did the car leave Town B? (b) If the distance between Town A and Town B is 240 km , calculate the speed of the lorry.

8 Rita en ring runt en tredjedel av burkarna.