Mehlala ea lipotso tsa mosebetsi oa matla a kinetic le fisiks

Mehlala e 5 ea lipotso tsa mosebetsi oa matla a kinetic le fisiks

1. Koloi e boima ba 5000 kg e qala ka ho phomola, ebe e tsamaya ka lebelo la 20 m/s. Fumana kakaretso ea mosebetsi o entsoeng koloing...
Puisano
Hoa tsebahala :
Boima (m) = 5000 kg
Lebelo la pele (v)_o) = 0 m/s (qalong koloi e ne e sa sisinyehe)
Lebelo la ho qetela (v)_t) = 20 m/s
E botsitsoe : Boiteko bo felletseng
Jawab :
Khopolo-taba ea matla a kinetic a mosebetsi e bolela hore mosebetsi oohle o lekana le phetoho ea matla a kinetic.
Boiteko bohle:
W_kakaretso = ½ m (v_t² - v_o²)
W_kakaretso = ½ (5000)(20² - 0²)
W_kakaretso = (2500)(400 – 0)
W_kakaretso = (2500)(400)
W_kakaretso = 1000.000
Kakaretso ea mosebetsi ke li-Joules tse 1000.000.

2. Ntho e boima ba 10 kg e qala ka lebelo la 5 m/s. Nakoana hamorao ntho eo e tsamaea ka lebelo la 10 m/s. Fumana mosebetsi oohle o entsoeng nthong eo.
Puisano
Hoa tsebahala :
Boima ba ntho (m) = 10 kg
Lebelo la pele (v)_o) = 5 m/s
Lebelo la ho qetela (v)_t) = 10 m/s
E botsitsoe : boiteko bo felletseng
Jawab :
Boiteko bohle:
Kakaretso ea mosebetsi ke li-Joules tse 375.

3. Koloi e boima ba 2000 kg e tsamaya ka lebelo le bataletseng la 10 m/s. Ka tshohanyetso, mokhanni o fokotsa lebelo la koloi ho 5 m/s. Mosebetsi o etswang ke mokhanni koloing ke...
Puisano
Hoa tsebahala :
Boima ba koloi (m) = 2000 kg
Lebelo la pele (v)_o) = 10 m/s
Lebelo la ho qetela (v)_t) = 5 m/s
E botsitsoe : boiteko bo felletseng
Jawab :
Boiteko bohle:
Kakaretso ea mosebetsi ke li-Joules tse 75.000.
Letšoao le fosahetseng le bolela hore matla a hlahang koloing a ka lehlakoreng le fapaneng le ho falla ha koloi. Mosebetsi o fosahetseng o boetse o bolela hore matla a kinetic a koloi aa fokotseha.

4. Koloi e boima ba tonne e le 'ngoe qalong ha e eme. Ka mora motsotsoana, e tsamaea ka lebelo la 10 m/s. Mosebetsi o etsoang ke enjene ea koloi ke...
A. 1.000 Joule
B. 10.500 Joule
C. 15.000 Joule
D. 25.000 Joule
E. 50.000 Joule
Puisano:
Hoa tsebahala :
m = 1 ton = 1000 kg, v_o = 0 m/s, v_t = 10 m/s
E botsitsoe :
Boiteko (W) ?
Jawab :
Mosebetsi = phetoho ea matla a kinetic

Phetoho ea matla a kinetic :
= ½ m(v_t² - v_o²) = ½ (1000)(100 – 0) = ½ (1000)(100) = 50.000 kg m²/s² = 50.000 Joule
Kahoo W = 50.000 Joule
Karabo e nepahetseng ke E.

5. Tafole e boima ba 10 kg qalong e ema fatshe e boreleli, ebe e sutumelletsoa metsotsoana e 10 hore e tsamaye ka mola o otlolohileng ka lebelo la 2 m/s.²Boholo ba boiteko bo etsahetseng e ne e le…
A. 2000 Joule
B. 3000 Joule
C. 6000 Joule
D. 8000 Joule
E. 9000 Joule
Puisano:
Hoa tsebahala :
m = 10 kg, t = metsotsoana e 10, v_o = 0, a = 2 m/s²,v_t = ?
E botsitsoe :
Boiteko (W) ?
Jawab :
Bala lebelo la ho qetela (v_t):
v_t = v_o + ho = 0 + (2)(10) = 20 m/s

Mosebetsi = phetoho ea matla a kinetic

Phetoho ea matla a kinetic :
= ½ m(v_t² - v_o²) = ½ (10)(400 – 0) = ½ (10)(400) = ½ (4000) = 2000 Joule
Kahoo W = 2000 Joule
Karabo e nepahetseng ke A.