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A 90W immersion heater is used to supply energy for 5 minutes. The energy supplied is used to completely melt 160g of a solid at its melting point. Calculate the specific latent heat of the solid.

A 90W immersion heater is used to supply energy for 5 minutes. The energy supplied is used to completely melt 160g of a solid at its melting point. Calculate the specific latent heat of the solid.

by Sunday | Sep 1 | Physics WAEC

A. 2.81jg−¹ B. 6.25Jg−¹ C. 8.89Jg−¹ D. 168.75Jg−¹ E. 5333.33Jg−¹ Correct Answer: Option D = 168.75Jg−¹ Explanation pt = ml 80 90 x 5 x 60 = 160 x L L = 27000/160 =...
A 90W immersion heater is used to supply energy for 5 minutes. The energy supplied is used to completely melt 160g of a solid at its melting point. Calculate the specific latent heat of the solid.

Using the data in the circuit illustrated below. Calculate the value of R.

by Sunday | Sep 1 | Physics WAEC

A. 0.02Ω B. 0.05Ω C. 5.00Ω D. 20.00Ω E. 50.00Ω Correct Answer: Option E – 50.00Ω Explanation R = VT=2v/40×10−³ = 50.00Ω
A 90W immersion heater is used to supply energy for 5 minutes. The energy supplied is used to completely melt 160g of a solid at its melting point. Calculate the specific latent heat of the solid.

Which of the following is stored by dry Leclanche cell?

by Sunday | Sep 1 | Physics WAEC

A. chemical energy B. nuclear energy C. solar energy D. heat energy E. electrical energy Correct Answer: Option A = chemical energy Explanation The energy stored in the dry Leclanche cell is the chemical energy. It converts chemical energy into electrical...
A 90W immersion heater is used to supply energy for 5 minutes. The energy supplied is used to completely melt 160g of a solid at its melting point. Calculate the specific latent heat of the solid.

In which of the points labelled A, B, C, D and E on the conductor shown would electric charge tend to concentrate most?

by Sunday | Sep 1 | Physics WAEC

A. A B. B C. C D. D E. E Correct Answer: Option E – E
A 90W immersion heater is used to supply energy for 5 minutes. The energy supplied is used to completely melt 160g of a solid at its melting point. Calculate the specific latent heat of the solid.

If the frequency of the e.m.f. source in the a.c. circuit illustrated below is 500/π Hz. What is the reactance of the inductor?

by Sunday | Sep 1 | Physics WAEC

A. 450 B. 0.9 C. 900 D. 567 E. 43 Correct Answer: Option C – 900 Explanation x = 2πfL=2π×500/π ×0.9 = 900Ω
A 90W immersion heater is used to supply energy for 5 minutes. The energy supplied is used to completely melt 160g of a solid at its melting point. Calculate the specific latent heat of the solid.

A particle of charge q and mass m moving with a velocity v enters a uniform magnetic field b in the direction of the field. The force on the particle is?

by Sunday | Sep 1 | Physics WAEC

A. qvB B. mqvB/m C. mvB/q D. O Correct Answer: Option D = O
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