Pt = mc??
2000 x20 x 60 = 30 x c x (45° -30°)
2400000 = 450c
= 5333.33Jkg^-1K^-1
joseph rimiru answered the question on October 11, 2017 at 17:21
- Ice change to water at 0° C. 5 kg of ice and 5 kg of water at 0° were heated separately. Give a reason why...(Solved)
Ice change to water at 0⁰ C. 5 kg of ice and 5 kg of water at 0⁰ were heated separately. Give a reason why more heat energy is required to heat ice.
Date posted: October 11, 2017. Answers (1)
- A boy took 10 kg of water and raised its temperature to 90° C. He add m2 kg of water at 20° C and...(Solved)
A boy took 10 kg of water and raised its temperature to 90⁰ C. He add m2 kg of water at 20⁰ C and the mixture attained a temperature of 50⁰ C. Determine the value of m2. (Assume the containers did not get heated. Specific heat capacity of water = 4200Jkg^-1k^-1)
Date posted: October 11, 2017. Answers (1)
- A ball was moving in a horizontal circle of radius 0.4 m makes 16 revolution per second. Find its centripetal acceleration.(Solved)
A ball was moving in a horizontal circle of radius 0.4 m makes 16 revolution per second. Find its centripetal acceleration.
Date posted: October 10, 2017. Answers (1)
- Find the value of -30^0 C on the absolute temperature scale.(Solved)
Find the value of -30^0 C on the absolute temperature scale.
Date posted: October 10, 2017. Answers (1)
- A sample of water was found to boil above 1000 C. State two factors that could have led this observation.(Solved)
A sample of water was found to boil above 1000 C. State two factors that could have led this observation.
Date posted: October 10, 2017. Answers (1)
- A battery of e.m.f 12 v and negligible resistance is connected to a 8 ohms resistor. How much power is dissipated by the resistor?(Solved)
A battery of e.m.f 12 v and negligible resistance is connected to a 8 ohms resistor. How much power is dissipated by the resistor?
Date posted: October 10, 2017. Answers (1)
- Determine the resistance of a blow dryer rated 3000 w, 240 v.(Solved)
Determine the resistance of a blow dryer rated 3000 w, 240 v.
Date posted: October 10, 2017. Answers (1)
- Determine the resistance of a bulb rated 100 w, 240 v.(Solved)
Determine the resistance of a bulb rated 100 w, 240 v.
Date posted: October 10, 2017. Answers (1)
- Calculate the energy dissipated in 5 minutes if an electric bulb with a filament of resistance 360 ohms is connected to 240 v mains supply.(Solved)
Calculate the energy dissipated in 5 minutes if an electric bulb with a filament of resistance 360 ohms is connected to 240 v mains supply.
Date posted: October 10, 2017. Answers (1)
- An energy saving bulb rated 10 w, 240 v was used continuously for 1000 hours. Determine the energy consumed giving your answer in kilowatt hour....(Solved)
An energy saving bulb rated 10 w, 240 v was used continuously for 1000 hours. Determine the energy consumed giving your answer in kilowatt hour. (kwh)
Date posted: October 10, 2017. Answers (1)
- In waves there is the occurrence of interference. State the necessary conditions for this to occur.(Solved)
In waves there is the occurrence of interference. State the necessary conditions for this to occur.
Date posted: October 10, 2017. Answers (1)
- On carrying out an experiment it was found that a voltmeter of high resistance was more accurate compared to that of low resistance. State the...(Solved)
On carrying out an experiment it was found that a voltmeter of high resistance was more accurate compared to that of low resistance. State the reason.
Date posted: October 10, 2017. Answers (1)
- What is Nuclear fission?(Solved)
What is Nuclear fission?
Date posted: October 10, 2017. Answers (1)
- Define Nuclide(Solved)
Define Nuclide
Date posted: October 10, 2017. Answers (1)
- Explain two dangers of electromagnetic waves.(Solved)
Explain two dangers of electromagnetic waves.
Date posted: October 10, 2017. Answers (1)
- State four Properties of electromagnetic waves(Solved)
State four Properties of electromagnetic waves
Date posted: October 10, 2017. Answers (1)
- State four applications of X-rays in industries.(Solved)
State four applications of X-rays in industries.
Date posted: October 10, 2017. Answers (1)
- State the dangers of X-rays to human body(Solved)
State the dangers of X-rays to human body.
Date posted: October 10, 2017. Answers (1)
- State types of X-rays(Solved)
State types of X-rays
Date posted: October 10, 2017. Answers (1)
- State the properties of X-rays(Solved)
State the properties of X-rays
Date posted: October 10, 2017. Answers (1)