Free help with homework

Why join Brainly?

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

. A piece of iron of

density 7.8 × 103kg/m3 and volume 100 cm3 is totally
immersed in water. Calculate (a) the weight of the iron piece in air (b) the
upthrust and (c) apparent weight in water. (ans. (a) 7.8N (b) 1N (c) 6.8 N)



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.
Density of iron (Dr) = 7.8×10³ kg/m³
volume of iron piece(V) = 100cm³ = 10^(-4) m³
density of water (Dw) = 10³ kg/m³

(a) weight in air = Dr×V×g = 7.8×10³ × 10^(-4) ×10 = 7.8 N

(b) upthrust is the buoyant force exerted by water
    upthrust = Dw×V×g = 10³ × 10^(-4) ×10 = 1N

(c) apparent weight in water = weight in air - upthrust
                                         = 7.8N - 1N = 6.8N

1 5 1
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