What Is the Specific Gravity of a Cube Weighing 0.54kg with 5cm Sides?

  • Thread starter Thread starter Raven1972
  • Start date Start date
  • Tags Tags
    Gravity Specific
AI Thread Summary
The discussion centers on calculating the specific gravity of a cube weighing 0.54 kg with 5 cm sides. The cube's volume is determined to be 125 cm³, leading to a calculated density of 4.32 g/cm³, which does not match the provided answer choices. There is confusion regarding the terms "specific gravity" and "specific weight," with a consensus that specific gravity should be unitless and typically relative to water. Participants express concern over the validity of the answer choices given the calculations and definitions discussed. Ultimately, the conclusion suggests that the correct specific gravity is indeed 4.32 g/cm³, not aligning with any of the options provided.
Raven1972
Messages
9
Reaction score
0
1. A Cube of lengths 5cm each. The cube weighs .54kg. What is its specific weight?



2. Answers: A)6 g cm3 B)3 g cm3 C) 2.5 g cm3 D) 2 g cm3



3. 5x5x5 = 125cm3 540g/125= 4.32 g cm3 which is none of the above. Could someone verify that I'm correct before I make an idiot of myself when I challenge the question setter?
 
Physics news on Phys.org
Raven1972 said:
1. A Cube of lengths 5cm each. The cube weighs .54kg. What is its specific weight?



2. Answers: A)6 g cm3 B)3 g cm3 C) 2.5 g cm3 D) 2 g cm3



3. 5x5x5 = 125cm3 540g/125= 4.32 g cm3 which is none of the above. Could someone verify that I'm correct before I make an idiot of myself when I challenge the question setter?

I've found out by a process of deduction that the answer is supposed to be 2.5 gcm3.
Is this wrong?
 
Specific gravity or specific weight?

If sg - I would say your approach (giving 4.32) is correct. There are possible problems here, like sg being relative to something, not necessarily water - so it doesn't have to be identical to density.

Answers given are strange, as units don't fit neither sg nor sw. Specific gravity should be unitles, specific weight units are N/m3 (more generally force/volume). g/cm3 is wrong - unless it is so called gram-force (9.8 mN) per cm3.
 
Borek said:
Specific gravity or specific weight?

There are possible problems here, like sg being relative to something, not necessarily water

In this case I believe it supposed to be water

Thanks for the answer. It has confirmed my own conclusions...
 
Thread 'Voltmeter readings for this circuit with switches'
TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
Thread 'Trying to understand the logic behind adding vectors with an angle between them'
My initial calculation was to subtract V1 from V2 to show that from the perspective of the second aircraft the first one is -300km/h. So i checked with ChatGPT and it said I cant just subtract them because I have an angle between them. So I dont understand the reasoning of it. Like why should a velocity be dependent on an angle? I was thinking about how it would look like if the planes where parallel to each other, and then how it look like if one is turning away and I dont see it. Since...

Similar threads

Back
Top