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svet-max [94.6K]
3 years ago
13

Which two of the following are the densest of the materials shown?

Physics
1 answer:
kari74 [83]3 years ago
3 0

Explanation:

The density of the material is given by,

Density = \frac{mass}{Volume}

Case 1: Rock

Density = \frac{mass}{Volume}

Density = \frac{1000}{0.5}

Density = 2000 \frac{g}{L}

Case 2: Pillow

Density = \frac{mass}{Volume}

Density = \frac{200}{10}

Density = 20 \frac{g}{L}

Case 3: Bottle of Soda

Density = \frac{mass}{Volume}

Density = \frac{2000}{2}

Density = 1000 \frac{g}{L}

Case 4: Load of bread

Density = \frac{mass}{Volume}

Density = \frac{100}{1}

Density = 100 \frac{g}{L}

Thus, rock and bottle of soda has maximum density.

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3 years ago
The flywheel of an engine has moment of inertia 2.50 kg m2 about its rotation axis. What constant torque is required to bring it
MrRissso [65]

Answer:

Explanation:

From the question we are told that

   The moment of inertia is  I = 2.50 \ kg \cdot m^2

    The final  angular speed is w_f =  400 rev/min  =  \frac{400 * 2\pi}{60}  = 41.89 \ rad/s

     The time taken is  t =  8.0 s

      The initial angular speed is  w_i  =  0\ rad/s

Generally the average angular acceleration is mathematically represented as

        \alpha  =  \frac{w_f - w_i }{t}

=>     \alpha  =  \frac{41.89}{8}

=>      \alpha  = 5.24 \ rad/s^2

Generally the torque is mathematically represented as

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=>    \tau   =  5.24 *  2.50

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5 0
3 years ago
Beth, a construction worker, attempts to pull a stake out of the ground by pulling on a rope that is attached to the stake. The
AnnyKZ [126]

Answer:

Fy=107.2 N

Explanation:

Conceptual analysis

For a right triangle :

sinβ = y/h formula (1)

cosβ = x/h formula (2)

x: side adjacent to the β angle

y:  opposite side of the β angle

h: hypotenuse

Known data

h = T = 153.8 N : rope tension

β= 44.2°with the horizontal (x)

Problem development

We apply the formula (1) to calculate Ty : vertical component of the rope force.

sin44.2° = Ty/153.8 N

Ty = (153.8 N ) *(sen44.2°)= 107.2 N  directed down

for equilibrium system

Fy= Ty=107.2 N

Fy=107.2 N upward component of the force acting on the stake

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Bats have poor vision and use echo-location to find their way.The frequency produced by bats is 100kHz. If the speed of the soun
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The distance covered is 25.9 m.

<h3>How deep is the cave?</h3>

We know that the speed of sound refers to the speed with which an sound moves in an object.

Given that;

speed of sound = 345m/s

Time taken =  0.15s

We know that;

v = 2d/t

v = speed of sound

d = distance

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d = 345m/s *  0.15s/2

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Which type of energy is stored in chemical compounds and released in chemical reactions?
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Answer:

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