Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions

An iron ball falls from a height of 1 km of the ground. If all the energy is converted into heat, the rise in temperature of the ball will be (sp. heat of


a). 23.3 degree celcius. B). 2.33 degree celcius
c). 233 degree celcius. D). 0.233 degree celcius



This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Let mass of iron ball = m
At height = 1km =1000m, 
total energy = potential energy = mgh = 1000*9.8*m = 9800m J =9.8m kJ
When all energy is converted into heat and used in raising the temperature of ball,
Specific heat of iron(s) = 0.1 kcal/kg C = 0.42 kJ/kg C 
Let change in temperature = ΔT
ms(ΔT) = mgh
⇒ms(ΔT) = 9.8m
⇒ s(ΔT) = 9.8
⇒ 0.42(ΔT) = 9.8
⇒ ΔT = 9.8/0.42 = 23.3 degree celsius

0 0 0
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts