Soru
Suppose we are told that the acceleration a of a particle moving with uniform speed v in a circle of radius r is proportional to some power of r, say r^n , and some power of v, say v^m the values of n and m and write the simplest form of an equation for the acceleration. a=kr^nv^m
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4.7
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Birsen
Profesyonel · 6 yıl öğretmeni
Uzman doğrulaması
Cevap
Given that the acceleration
of a particle moving with uniform speed
in a circle of radius
is proportional to some power of
, say
, and some power of
, say
, we can write the relationship as:
To determine the values of
and
, we need to consider the physical context and the units involved.1. **Acceleration (
)**: The unit of acceleration is meters per second squared (
).2. **Radius (
)**: The unit of radius is meters (
).3. **Velocity (
)**: The unit of velocity is meters per second (
).Let's analyze the units:
Substituting these units into the equation
:
This simplifies to:
For the units to balance, the exponents must add up to the correct powers of
and
:- The exponent of
on the right-hand side must be 1 (since the radius is a length and thus has units of meters).- The exponent of
on the right-hand side must be -2 (since acceleration is measured in
).Therefore, we have:
Solving for
:
Substituting
into
:
Thus, the simplest form of the equation for the acceleration is:
This equation indicates that acceleration is inversely proportional to the radius and directly proportional to the square of the velocity.