Grade 9 Physics (Heat fusion, Heat Capacity)

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SUMMARY

The discussion centers on a Grade 9 Physics homework problem involving heat fusion and heat capacity calculations. The calculations provided by the user yield a total heat energy of 68,500 J, or 6.8 x 104 J. The user questions the validity of the multiple-choice answers provided by the teacher, suggesting a possible typographical error in the options, specifically regarding the exponent in the answer choices.

PREREQUISITES
  • Understanding of heat capacity and heat fusion concepts
  • Familiarity with the formula Q = mcΔT for heat calculations
  • Basic algebra skills for manipulating equations
  • Knowledge of scientific notation and exponent rules
NEXT STEPS
  • Review the principles of heat capacity and heat fusion in thermodynamics
  • Practice solving problems using the formula Q = mcΔT
  • Learn about common typographical errors in physics problems
  • Explore scientific notation and its applications in physics
USEFUL FOR

Students studying Grade 9 Physics, educators teaching thermodynamics, and anyone interested in mastering heat energy calculations.

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Homework Statement
The melting point of a solid is 90 C. What is the heat required to change 2.5 kg of this solid at 30 C to a liquid

The specific heat of the solid is (390 j/KG.C) and its heat fusion is (4000 J/KG)
Relevant Equations
Q=mC ΔT heat capacity
Q=mHf heat of fusion
Q1=2.5(390)(90-30) =58500

Q2=2.5(4000) = 10000

Qtotal = 58500+10000

Q=68500

=6.8x10^4

my teacher sent this as a homework but the options were
4.9x10^4 J
1x10^4 J
6.8x10^5 J
5.9x10^4 J

im confused is is this a typo or did i do something wrong
 
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I agree with your answer, perhaps they just put a "^5" instead of a "^4"?
 

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