Question

How much work would a child do while pulling a 12-kg wagon a distance of 43 m with a 22 N force? Question 7 Not yet answered Marked out of 1.00 Flag question Select one: A. 95) B.52) C109) O 0.67) Question 8 Not yet answered Marked out of 1.00 P Flag question A board that is 20.0 cm wide, 5.00 cm thick, and 3.00 m long has a density 300 kg/m3. The board is floating partially submerged in water of density 1000 kg/m". What fraction of the volume of the board is above the surface of the water? Select one: O A.0.700 B. zero c.0.200 D. 0.300 E. The answer depends on which edge of the board is vertical.

Answer 1

Y force applied (f )= 22N distance (d ) = 6.3 m work done (wo=fxd = 22% 4.3 w=9406 w=95J 8 Board dimension 20 cm x 5cm x 3 m 0. 20 mxo.05 m x 3 m Demsity cé) = 300 kolme Board mays (m2-v= 300 X0-20 X0-0583 mi a kg 3 water density (w = 1000 bolm Buoyancy force (fp) = ewgv seebmerged weight of the board Buoyancy face mg = w g sub m evo = w Sub Vseeb e 300 . 0.300 v Ew 1 000

à = 3:01 +4.03 - 206 8 = 2.01 -6.09 - 3.0 1 poi ĀS = (362) (17) +(4x-6) j-j & A +(-2.X-3 ) 6.6 44 وم 6 -24 + 6 = 212 MB =-12 iS 2 m UEO same LS the Two objects mass m" and dropped from same height so velocity vis for both masses at the ground. kinetic energy binetic energy of mass am 1(2mave v 2 mass m'= mv 2({ mu] 13 So, answer is: one will The heavier will have twice the kinetic energy of the lighter one.