Վ․ Ի․ Լուկաշիկի խնդրագրքի 36-էջի 275-285 խնդիրները
275․
P=1Ն
276․
m1 = 6կգ
m2 = 40կգ
m3 = 400կգ
m4 = 2000կգ
m5 = 4000կգ
g = 9.8Ն/կգ
F1-5 — ?
F = mg
F1 = m1g = 6կգ * 9,8Ն/կգ = 58,8Ն
F2 = m2g = 40կգ * 9,8Ն/կգ = 392Ն
F3 = m3g = 400կգ * 9,8Ն/կգ = 3920Ն
F4 = m4g = 2000կգ * 9,8Ն/կգ = 19600Ն
F5 = m5g = 4000կգ * 9,8Ն/կգ = 39200Ն
277
V=18,75լ=18750սմ3
ρ=0,8գ/սմ3
g = 9.8Ն/կգ
P — ?
P=mg
m=ρV=0,8գ/սմ3*18750սմ3=15000գ=15կգ
P=15կգ*0,8Ն/կգ=147Ն
278
V=25լ=25000սմ3
ρ=0,71գ/սմ3
g = 9.8Ն/կգ
P — ?
P=mg
m=ρV=0,71գ/սմ3*25000սմ3=17750գ=17,75կգ
P=17,75*9,8=173,95Ն
279
m = 20կգ
g = 9.8Ն/կգ
P — ?
P=mg=20կգ*9.8Ն/կգ=196Ն
280
m1 = 1կգ
V2 = 5լ = 5000սմ3
ρ = 0,8գ/սմ3
g = 9.8Ն/կգ
P — ?
P = mg
m = m1+m2
m2 = ρV2 = 0,8գ/սմ3 * 5000սմ3 = 4000գ = 4կգ
m = 1կգ+4կգ = 5կգ
P = 5կգ * 9.8Ն/կգ = 49Ն
281
l = 50սմ
h = 15սմ
w = 15սմ
ρ = 0,8գ/սմ3
g = 9.8Ն/կգ
P — ?
P = mg
m = ρV
V = 50սմ * 15սմ * 15սմ = 11250սմ3
m = 0,8գ/սմ3 * 11250սմ3 = 9000գ = 9կգ
P = 9կգ * 9.8Ն/կգ = 88,2Ն
282
V = 10սմ*8սմ*5սմ = 400սմ3
ρ = 8,5գ/սմ3
g = 9.8Ն/կգ
F — ?
F = mg
m = ρV = 8,5գ/սմ3 * 400սմ3 = 3400գ = 3,4կգ
F = 3,4կգ * 9.8Ն/կգ = 33.32Ն
283
F = 49Ն
g = 98Ն/կգ
m — ?
m = F/g = 49Ն / 9,8Ն/կգ = 5կգ
284
F = 392Ն
g = 98Ն/կգ
m — ?
m = F/g = 392Ն / 9,8Ն/կգ = 40կգ
285
p = 980Ն
g = 98Ն/կգ
m — ?
m = P/g = 980Ն / 9,8Ն/կգ = 100կգ