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Misha Larkins [42]
3 years ago
8

a step of science investigation tells you to walk 3m in a straight line, then turn 60 degrees to your right. you repeat this ste

p until you are standing at your original position what shape have you traced?
Physics
2 answers:
IgorC [24]3 years ago
8 0

If you walk 3m in a straight line then turn 60 degrees until you are standing at your original position then you have walked a hexagon

tiny-mole [99]3 years ago
4 0

Here we can see that after moving for distance of d = 3 m it takes turn at 60 degree angle

this will continue till it comes to its own position

so it will look like a polygon

here Number of sides of polygon is given as

N = \frac{total Angle}{exterior angle}

now we will have

N = \frac{360}{60} = 6

So here we have total sides are 6

So here it will be a polygon of 6 sides

so it's shape will be a regular hexagon of each side as 3m length

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A reasonable estimate of the moment of inertia of an ice skater spinning with her arms at her sides can be made by modeling most
Oxana [17]

Answer:

A)  I_{total} = 1.44 kg m², B) moment of inertia must increase

Explanation:

The moment of inertia is defined by

     I = ∫ r² dm

For figures with symmetry it is tabulated, in the case of a cylinder the moment of inertia with respect to a vertical axis is

      I = ½ m R²

A very useful theorem is the parallel axis theorem that states that the moment of inertia with respect to another axis parallel to the center of mass is

    I = I_{cm} + m D²

Let's apply these equations to our case

The moment of inertia is a scalar quantity, so we can add the moment of inertia of the body and both arms

      I_{total}=I_{body} + 2 I_{arm}

       I_{body} = ½ M R²

The total mass is 64 kg, 1/8 corresponds to the arms and the rest to the body

       M = 7/8 m total

       M = 7/8 64

       M = 56 kg

The mass of the arms is

      m’= 1/8 m total

      m’= 1/8 64

      m’= 8 kg

As it has two arms the mass of each arm is half

     m = ½ m ’

     m = 4 kg

The arms are very thin, we will approximate them as a particle

    I_{arm} = M D²

Let's write the equation

     I_{total} = ½ M R² + 2 (m D²)

Let's calculate

    I_{total} = ½ 56 0.20² + 2 4 0.20²

    I_{total} = 1.12 + 0.32

    I_{total} = 1.44 kg m²

b) if you separate the arms from the body, the distance D increases quadratically, so the moment of inertia must increase

6 0
4 years ago
A 7 ft tall person is walking away from a 20 ft tall lamppost at a rate of 5 ft/sec. Assume the scenario can be modeled with rig
aleksandr82 [10.1K]

Answer:

The rate of change of the shadow length of a person is 2.692 ft/s

Solution:

As per the question:

Height of a person, H = 20 ft

Height of a person, h = 7 ft

Rate = 5 ft/s

Now,

From Fig.1:

b = person's distance from the lamp post

a = shadow length

Also, from the similarity of the triangles, we can write:

\frac{a + b}{20} = \frac{a}{7}

a = \frac{7}{13}b

Differentiating the above eqn w.r.t t:

\frac{da}{dt} = \frac{7}{13}.\frac{db}{dt}

Now, we know that:

Rate = \frac{db}{dt} = 5\ ft/s

Thus

\frac{da}{dt} = \frac{7}{13}.\times 5 = 2.692\ ft/s

5 0
3 years ago
Which of these forces determines the chemical properties of an atom? friction force nuclear force gravitational force electrical
zysi [14]
The answers is an electrical force.
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3 0
4 years ago
One glass microscope slide is placed on top of another with their left edges in con- tact and a human hair under the right edge
-Dominant- [34]

Answer:

A dark fringe

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3 years ago
What is simple machine<br>​
notsponge [240]

Answer:

ϟ \huge{ \boxed{ \purple{ \text{Simple \: Machine}}}}

⤥ We use different types of devices in our life to make our work easier. A spade is used to dig , a broom is used to sweep , a hammer is used to pass a nail on the wall and a plank is used to drag a load up to a certain height. All these simple things or devices , which are used in our daily life are called simple machines. Such simple machines do not do our work themselves but we have to use force on them to work with them. Thus , Simple machines are those tools or devices which make our work easier and convenient to do in the direction of force.

Hope I helped ! ッ

Have a wonderful day / night ♡

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7 0
3 years ago
Read 2 more answers
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