# Questions tagged [units]

Units are standards of measurement used for different types of quantities.

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### Error Analysis - Units and Dimensions [closed]

I have a question regarding error analysis in Units and dimensions chapter in physics. It is regarding finding equivalent resistance in parallel I have a attached 2 images of the same question solved ...
1answer
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### If a model car is made of 9.35 kg iron, what is the mass of gold required to recast the car using gold? [closed]

The detailed question is An automobile company displays a die-cast model of its first car, made from 9.35 kg of iron. To celebrate its hundredth year in business, a worker will recast the model in ...
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### Cgs to Si with Force

So i just have a Problem with the transition from Cgs to SI. I want to Calculate the Force of the Plates of a Capacitor. The Formula is the following:(k=1,2,3 and Einstein Notation is used and T is ...
1answer
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### Making the distinction between position and time in a gravitational system

Say we have a large spherical shell of thickness $R$ floating in space. The shell has a hole of negligible radius punched into one side that allows for a ball of mass $m$ to pass through. Say now that ...
1answer
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### Why do we need to convert revolutions into radians before we multiply with meters?

When we are calculating tangential acceleration, I notice that we have to convert the $\alpha$ that was in unit of rev/min^2 into the unit of rad/min^2 before we are able to multiply this value with a ...
4answers
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### Basic Question About Canceling Units

This is a very basic question but, here it is. In a given equation, where I have a term such as 4 m/s and I multiply this by the variable t, which is time, why is it incorrect for me to cancel out t ...
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### Derived units described with multiple 'per's

In a dimensional analysis problem, a rate was given textually as so many "Milliliters per Kilograms per Day". This seems ambiguous, as one could either interpret it as A:: Ml / (Kg / Day) = ...
1answer
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### Meaning of a product of two physical units [duplicate]

I am having a hard time to understand the meaning of measurements that involve a product of physical units, like $10\, \rm N\cdot m$ ($10$ Newton-meters), $3.33\, \rm J\cdot s$ ($3.33$ Joules-second),...
0answers
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### Why did the scientific community stop using hydrogen as the main measure for the atomic mass unit?

The only thing I could find is that the community switched form one hydrogen atom to 1/16 of Oxygen-16 (which they thought to be the only isotope that exists at time because they had no concept of ...
1answer
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### Understanding the meaning of the integral of energy of an $\rm H$ atom

This is probably very basic but my notes are confusing and not clearly written so I would appreciate some help in trying to clarify the following points: If we consider the expression \left\langle \...
1answer
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### How to express the force of a GPU in Pound-hours?

I am training a neural network on a small cluster of GPU-equipped computers. Out of curiosity, I would like to express the force of the running GPU's in terms of the force required for a car to remain ...