La pressió recomanada per a les rodes d'un camió són, aproximadament, de 7 bars per a les del davant i de 6 bars per a les del darrere ( els valors poden variar segons la grandària del vehicle). En canvi, en el cas dels cotxes, valor oscil·la entre 2,6 i 2,3 bars, respectivament. Per què hi ha aquesta diferència?

6–48 bananas are to be cooled from 24 to 138c at a rate of 215 kg/h by a refrigeration system. the power input to the refrigerator is 1.4 kw. determine the rate of cooling, in kj/ min, and the cop of the refrigerator. the specific heat of banana above freezing is 3.35 kj/kg·8c.

Review multiple-concept example 7 in this chapter as an aid in solving this problem. in a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. in one instance, the radius of the circle is 0.626 m. at one point on this circle, the ball has an angular acceleration of 66.1 rad/s2 and an angular speed of 12.6 rad/s. (a) find the magnitude of the total acceleration (centripetal plus tangential) of the ball. (b) determine the angle of the total acceleration relative to the radial direction.

How is an electron dot structure used to represent a covalent bond?