Question

When an object moves from initial point to final point on a floor. The thermal energy generated between ta det som derelica O A kinetic frictional force OB. speed of the object O C acceleration due to gravity OD. Static frictional force QUESTION 2 A child whose weight is 325 N slides down a 92 m playground slide that makes an angle of 30 with the horizontal The coefficient of kinetic friction between side and child in 0.20 How much energy is transferred to thermal energy? O A. 318) OB. 418 OC.518

Answer 1

Sony Whon an olject mouss from initial point to final paint on a floor. The Thermal Energy generated between the object & flas is given by Rf Cospel fx - Me A kinetic friction Coefficient Any A) A kinetic frictimal foree If = fxR Deth 'K Q to mo W=325N DEM=/Rf Case L here of Angle between the kinetic frickson fore & the direction of motion. 6=105 at Nounal fore.

Cosso og fingo my fang = 320N R= do mg Ca 30°= 325x VG = 287.45N DE 281045X(0:20) X Coy Leo') x 9:21 DER=1-51815 10 6 5518Jl Ah ( 3) W=4.5 +0.844 -2.742 Ladis 0 + 0.64 - 5.4+ dt put t=9 sec L = 0.64 - JouXg a = 47.96 127 48 Rad dec 2-, Др

7 260 Nm t = 2 min 20X60 sec N=25 W = 2018 = 211x2 5 = 1,308 fad 7 2x60 - sec Touqul y Angular speed P Powere T Xo p=26 x 1.308 IP = 34ow 90 In unsform crear motion terngential acceleration n gero because of motion to angular velocity re o = w=constant Kyi constent at (1" so

17 in 'wick done by lason force Change potential Energy) goparit y = migh-ongen Engl (ch, che) = 6.5x10 19 = 3.3 T om Decal Here momentam & kasker Evegy is conserved so By momentum conservation an, a, tm " = (m+m) V-0 oft Bullet & Block respectively ",," initial deberting of Bullet & Block m, me masses v final velosity of the sylken At rest to tunay egho (9.54109)x(960) to (9.5*103 + 510x103) Y

VE (9.5X900) X163 m (9.5+560 ) x 1of3 sec TY Resulting speed of Bock we can calentate by "Potentical Energy Conservation, X= 16.78 m sec at the Kinese Energy +