2023

Physics

POST UTME

How long does it take a 750W heater to raise the • temperature of 1 kg of water from 20°C to 50°C? (Specific heat capacity of water = $4200Jkg^{-1}k^{-1}$ )

A. 84s

B. 112s

C. 168s

D. 280s

Correct Answer:
168s

Explanation

t $= \frac {mc\theta}{p}$ = $\frac {1 \times 4200 \times 30}{750}$
t = 16secs

t $= \frac {mc\theta}{p}$ = $\frac {1 \times 4200 \times 30}{750}$

t = 16secs

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2023

Physics

POST UTME

How long does it take a 750W heater to raise the • temperature of 1 kg of water from 20°C to 50°C? (Specific heat capacity of water = ﻿4200Jkg−1k−14200Jkg^{-1}k^{-1}4200Jkg−1k−1﻿)

A.

84s

B.

112s

C.

168s

D.

280s

Correct Answer: 168s

Explanation

t ﻿=mcθp= \frac {mc\theta}{p}=pmcθ​﻿ = ﻿1×4200×30750\frac {1 \times 4200 \times 30}{750}7501×4200×30​﻿ t = 16secs

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How long does it take a 750W heater to raise the • temperature of 1 kg of water from 20°C to 50°C? (Specific heat capacity of water = $4200Jkg^{-1}k^{-1}$ )

Correct Answer:
168s

t $= \frac {mc\theta}{p}$ = $\frac {1 \times 4200 \times 30}{750}$
t = 16secs