Ihe atụ abụọ nke ajụjụ ike
Ike bụ ọsọ e ji arụ ọrụ azụmahịa ma ọ bụ mgbalị e mere n'oge ụfọdụ.
N'ihe gbasara nha, ike bụ oke nke mgbalị na oge.
P=W/t
Nkọwa: P = ike (nkeji Joule/sekọnd), W = ọrụ (Joule) na t = oge etiti (sekọnd)
Dabere na nha nha a, enwere ike ikwubi na ka ọsọ a na-arụ ọrụ si dị, otú ahụ ka ike si dị, n'aka nke ọzọ, otú ahụ ka ọsọ a na-arụ ọrụ si dị obere, otú ahụ ka ike ahụ si dị obere.
Ike bụ ọnụọgụgụ scalar. Usoro mba ụwa nke nkeji maka ike bụ joule/sekọnd. Joule/sekọnd = watt (nke a kpọchiri akpọchi W), aha ya bụ nsọpụrụ nke James Watt.
Usoro ike nke ndị Britain bụ 1 paụnd-foot-force kwa sekọnd. Nke a dị obere maka ebumnuche bara uru, yabụ a na-eji otu nnukwu ike, ike ịnyịnya (nke a na-akpọ hp), eme ihe. 1 horsepower = 550 paụnd-foot-force kwa sekọnd = 764 watts = ¾ kilowatt.
Enwere ike igosi oke ọrụ ahụ na nkeji nke oge x ike, dịka ọmụmaatụ awa kilowatt ma ọ bụ awa KWH (awa Kilo Watt). Otu KWH bụ ọrụ a na-arụ na ọsọ nke kilo Watt 1 maka otu awa.
1. Onye dị kilogram iri ise na-arịgo steepụ dị mita iri n'ogologo ruo nkeji abụọ. Ọ bụrụ na ọsọ ọsọ nke ike ndọda (g) bụ 10 m/s2, mgbe ahụ ike a na-enweta bụ….
Mkparịta ụka
A maara :
Ibu (m) = 50 kg
Ogologo (h) = mita 10
Ọsọ ọsọ n'ihi ike ndọda (g) = 10 m/s2
Oge etiti oge (t) = nkeji 2 = 2 (60) = sekọnd 120
A jụrụ : ike (P)
Jawab :
Usoro ike :
P=W/t
Nkọwa: P = ike, W = ọrụ, t = oge
Usoro azụmaahịa :
W = Fs = wh = mgh
Nkọwa: W = ọrụ, F = ike, w = ike ndọda, s = mbugharị, h = elu, m = oke, g = osooso n'ihi ike ndọda.
Mgbe a na-arịgo steepụ, ike ndọda na-arụ ọrụ n'ahụ onye ahụ. Ọrụ nke ike na-agbanwe agbanwe dịka ndọda na-arụ dabere naanị na mgbanwe dị n'ịdị elu. Ọrụ nke ike ndọda na-arụ na-eme ka ike ndọda onye ahụ dịkwuo elu. Ọrụ nke ike ndọda na-arụ n'ahụ onye ahụ bụ:
W = mgh = (50)(10)(10) = 5000 Joules.
Ya mere, ike a na-enweta mgbe mmadụ rịgoro steepụ bụ:
P = W / t = 5000 / 120 = 41,7 Joules/sekọnd.
2. Onye dị kilogram iri isii na-arịgo osisi aki oyibo ruo mita ise n'ime sekọnd iri. Ike dị mkpa iji rịgoro osisi aki oyibo bụ… g = 10 m/s2
Mkparịta ụka
A maara :
Ibu (m) = 60 kg
Ogologo (h) = mita 5
Ọsọ ọsọ n'ihi ike ndọda (g) = 10 m/s2
Oge etiti oge (t) = 10 sekọnd
A jụrụ : Ike
Jawab :
Azụmahịa:
W = mgh = (60)(10)(5) = 3000 Joules
Ike:
P = W / t = 3000 / 10 = 300 Joules/sekọnd.
