Question

prosze od zadania 5 , pomozcie

Answer 1

z.5

a = 2 m

h = 3 m

L = 2 * 6 * 2 m + 6*3 m = 24 m + 18 m = 42 m

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z.6

a = 4x

h = x

V = Pp*h = [ a^2 p(3)/4 ] *h = [ 16x^2 *p(3)/4] *x = 4 x^3 * p(3)

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z.7

a = 10 cm

b = 12 cm

h = 20 cm

V1 = 0,5*a*b*h = 0,5*10*12*20 = 0,5*2 400 = 1 200

V1 = 1200 cm^3

V2 = 0,6*a*b*h = 0,6 *2 400 = 1440

V2 = 1 440 cm^3

V = V2 - V1 = 1 440 - 1200 = 240 V = 240 cm^3  = 0,24 dm^3 = 0,24 litra

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z.8

a = 30 cm

b = 20 cm

h = 12 cm

H = 40 cm

Pp = 0,5*[ 30 + 20]*12 = 300

Pp = 300 cm^2

V = Pp* H = 300 cm^2 * 40 cm = 12 000 cm^3

m = 19,3 g/cm^3 * V = 19,3 g/cm^3 * 12 000 cm^2 = 231 600 g = 231,6 kg

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