Ukushisa Okukhulu Ukushisa Okuqondile Ukushintsha kwezinga lokushisa - Izinkinga Nezixazululo

9 Ukushisa Okukhulu Ukushisa Okuqondile Ukushintsha kwezinga lokushisa - Izinkinga Nezixazululo

1. I-lead engu-2 kg ifudunyezwa kusuka 50^oC kuya ku-100^oC. Isigungu ukushisa okuqondile i-lead 130 J.kg^{-1 o}C^-1. Malini ukushisa imuncwa yi-lead?

Kwaziwa:

Isisindo (m) = 2 kg

Ukushisa okuthile (c) = 1 3 0 J.kg ^-1 C ^-1

Ushintsho lokushisa ( Δ T) = 100 ^o C – 50 ^o C = 50 ^o C

Okufunwayo: Ukushisa (Q)

Isixazululo:

Q = mc Δ T

Q = ukushisa , m = isisindo, c = ukushisa okuthile , Δ T = ushintsho lokushisa

Ukushisa okumuncwa yi-lead:

Q = (2 kg)(1 3 0 J.kg ^-1 C ^-1 )(50 ^o C)

Q = (100)(1 3 0)

Q = 1 3,000 amaJoules

Q = 1.3 x ¹⁰⁴ Ama-Joules

[irp]

2. Ukushisa okuqondile kwethusi kungu-390 J/k g ^o C, ushintsho lokushisa lungu- 40 ^o C. Uma ithusi limunca ama-Joules angu-40 okushisa, buyini ubunzima bethusi!

Kwaziwa:

Ukushisa okuqondile kwethusi (c) = 390 J/k g ^o C

Ushintsho lokushisa ( ΔT ) = 40 ^o C

Ukushisa ( Q) = 40 J

Okufunwayo: Isisindo (m) sethusi

Isixazululo:

Q = mc Δ T

40 J = (m)( 390 J/k g ^o C)(40 ^o C)

40 = (m)( 390 /k g)(40)

40 = (m)( 390/kg )(4)

40 = (m)( 1560/kg )

m = 40 / 1560

m = 0.026 kg

m = amagremu angu-26

3. Izinga lokushisa lokuqala lamagremu angu-20 amanzi lingu-30 ^oC . Ukushisa kwamanzi okuqondile kungu-1 cal g ^{-1 oC -1} . Uma amanzi emunca amakhalori angu-300 okushisa, thola izinga lokushisa lokugcina!

Kwaziwa:

Isisindo (m) = 20 gr

Izinga lokushisa lokuqala (T1 ₎ = 30 ^o C

Ukushisa kwamanzi okuthile (c) = 1 cal gr ^{-1 o} C ^-1

Ukushisa (Q) = 300 cal

Okufunwayo: Izinga lokushisa lokugcina lamanzi

Isixazululo:

Q = mc ΔT

Ama-calories angu-300 = (20 gr)( 1 ama-calories gr ^{-1 o} C ^-1 )( T ₂ -30 )

300 = (20)(1)( T ₂ -30)

300 = 20 ( T ₂ -30 )

300 = 20 T ₂ – 600

300 + 600 = 20T ₂

900 = 20T ₂

I-T ₂ = 900 / 20

I-T ₂ = 45

Ushintsho lokushisa luyi-45 ^o C – 30 ^o C = 15 ^o C.

 [irp]

4. Tushintsho lokushisa amanzi olwandle is 1^oC lapho amanzi emunca ama-Joules angu-3900 okushisa. Ukushisa okukhethekile kwamanzi olwandle 3.9 × 10³ J/kg°C, Iyini isisindo samanzi olwandle.

Kwaziwa:

Ushintsho lokushisa ( ΔT ) = 1 ^o C

Ukushisa (Q) = 3900 Joule

Ukushisa okuthile kwamanzi olwandle (c) = 3.9 x 10 ³ J/ k g°C = 3900 J/Kg°C

Okufunwayo: Isisindo (m)

Isixazululo:

Q = mc Δ T

Q = ukushisa , m = isisindo, c = ukushisa okuthile , Δ T = ushintsho lokushisa

m = Q / c Δ T = 3900 / (3900)(1) = 3900 / 3900 = 1 kg

5. Ithusi elingama-2 kg limunca ukushisa okungu-39,000 J ku - 30°C. Uma ukushisa okuqondile kwethusi kungu-390 J/kg °C, liyini izinga lokushisa lokugcina lethusi…

Kwaziwa:

Isisindo (m) = 2 kg

Izinga lokushisa lokuqala (T1 ₎ = 30 ^o C

Ukushisa (Q) = 39,000 Joule

Ukushisa okuqondile (c) kwethusi = 390 J/kg ^o C

Okufunwayo : Izinga lokushisa lokugcina ( _T2 )

Isixazululo:

Q = mc ΔT

Q = ukushisa , m = isisindo, c = ukushisa okuthile , ΔT = ushintsho lokushisa

Q = mc ΔT = mc (T ₂ – T ₁ )

39,000 = (2)( 390)(T ₂ - 30)

100 = (2)(1)(T ₂ - 30)

100 = (2)(T ₂ – 30)

50 = T ₂ – 30

I-T ₂ = 50 + 30

I-T ₂ = 80 ^o C

[irp]

6. Amanzi angu-5 kg ashiswa kusukela ku-15°C kuya ku - 40°C. Kuyini ukushisa okumuncwa ngamanzi. Ukushisa okuqondile kwamanzi kungu- 4.2 × 10 ³ J/Kg° C.

Kwaziwa:

Isisindo (m) = 5 kg

Izinga lokushisa lokuqala (T1 ₎ = 15°C

Izinga lokushisa lokugcina (T2 ₎ = 40°C

Ukushisa kwamanzi okuqondile (c) = 4.2 × 10 ³ J/kg° C

Okufunwayo: Ukushisa (Q)

Isixazululo:

Q = mc ΔT

Q = (5 kg)( 4.2 × 10 ³ J/kg°C)(40°C – 15°C)

Q = (5)( 4.2 × 10 ³ J)(25)

Q = 525 x 10 ³ J

Q = 525,000 Joule

7. Amanzi angu-2 kg ashiswa kusukela ku-24°C kuya ku - 90°C. Kuyini ukushisa okumuncwa ngamanzi. Ukushisa okuqondile kwamanzi kungu- 4.2 × 10 ³ J/Kg° C.

Kwaziwa:

Isisindo (m) = 2 kg

Izinga lokushisa lokuqala (T1 ₎ = 24°C

Izinga lokushisa lokugcina (T2 ₎ = 90°C

Ukushisa kwamanzi okuqondile (c) = 4,200 Joules/kg°C

Kufunwa :: Ukushisa (Q)

Isixazululo:

Q = m c ΔT

Q = (2 kg)( 4,200 Joules/kg°C)(90°C – 24°C)

Q = (2 kg)( 4,200 Joules/kg°C)(66°C)

Q = (132)( 4,200 amaJoules)

Q = 554,400 Joule

[irp]

8. Amanzi angamagremu ama-5 ashiswa kusukela ku-10°C kuya ku - 40°C. Kuyini ukushisa okumuncwa ngamanzi. Ukushisa okuqondile kwamanzi kungu-1 × 10 ³ cal /g r ° C.

Kwaziwa:

Isisindo (m) = amagremu angu-5

Izinga lokushisa lokuqala (T1 ₎ = 10 ^o C

Izinga lokushisa lokugcina (T2 ₎ = 40 ^o C

Ukushisa kwamanzi okuqondile (c) = 1 c al/ gr°C

Okufunwayo : Ukushisa

Isixazululo:

Q = mc ΔT

Q = (amagremu ama-5)( 1 cal/ gr°C)(40 ^o C – 10 ^o C)

Q = (5)( 1 c al)(30)

Q = amakhalori angu -150

9. Amanzi angu-0.2 kg amunca ama-Joules angu-42,000 okushisa ku- 25 ^oC . Ukushisa kwamanzi okuqondile kungu-4200 J/kg ^oC , okuyizinga lokushisa lokugcina lamanzi.

Kwaziwa:

Isisindo samanzi (m) = 0.2 kg

Ukushisa (Q) = 42,000 Joule

Ukushisa kwamanzi okuqondile (c) = 4200 J/kg ^o C

Izinga lokushisa lokuqala (T1 ₎ = 25 ^o C

Okufunwayo: Izinga lokushisa lokugcina ( _T2 )

Isixazululo:

Q = mc ΔT = mc (T ₂ – T ₁ )

Q= ukushisa, m = isisindo, c = ukushisa okuqondile, ΔT = ushintsho lokushisa, T₁ = izinga lokushisa lokuqala, T₂ = izinga lokushisa lokugcina

Q = mc (T ₂ – T ₁ )

42,000 = (0.2)(4200)(T ₂ - 25)

42,000 = 840 (T ₂ – 25)

42,000 = 840 T ₂ – 21,000

42,000 + 21,000 = 840 T ₂

63,000 = 840 T ₂

I-T ₂ = 63,000 / 840

I-T ₂ = 75 ^o C

1. Ukuguqula izikali zokushisa
2. Ukunwetshwa komugqa
3. Ukwandiswa kwendawo
4. Ukunwetshwa kwevolumu
5. Heat
6. Okulingana nokushisa okwenziwe ngomshini
7. Ukushisa okukhethekile kanye nomthamo wokushisa
8. Ukushisa okucashile, ukushisa kokuhlanganiswa, ukushisa kokushisa komhwamuko
9. Ukonga amandla okudlulisa ukushisa