Question

Assume that the kinetic energy of a 1000 kg car moving at 125 km/h could be converted entirely into heat.What amount of water could be heated from 16 ∘C to 52 ∘C by the car's energy? Express your answer using two significant figures.

Answer 1

A-Given mass of car, m- 1000kg. Velocity of cari v= 125 km/h - 125 x 5 7 5 m/s V = 34.72 m/s Then, kinetic Energy of car, KE - - mu? Joules + KE (1000 kg) (34.72 m/s)? x1000x (34.72)2. 19-M3)? = 12 x 1000 X (1205.47) Joules KE = 602739.2 Jarles This Energy was used to heat water from ; initial Ti = 16°C temperature temperature final Tea 52°1 : Joules Here, heat Energy supplied Or = k. E= 602739-2 we know ; Tor=ms at m= mass of water heated = 9 s = specific heat of water = 4.186 Joule/ AT = Tf - Ti = (52-16)°C = 36°C ter - 4.186 Josele / gram oc + 603739.Joules = (mn) (.86 Tote groem ) (364) 602739.2 = m (4.186) (36) gram- m= 602739.2. • 14-186) (36) - grams - 602739.2 150.696 = 3999.70 gramy. er) : 3999.70 grams of water = 3.999 kgs is heated.