Answer:
a) w₂ = 5.16 rev / s
, b) K₀ = 29.55 J, K₂ = 190.88 J
Explanation:
The skater forms an isolated system whereby its angular momentum is preserved
Initial. With outstretched arms
L₀ = I₀ w₀
Final. With arms stuck
L₂ = I₂W₂
L₀ = L₂
I₀ w₀ = I₂ w₂
w₂ = I₀ / I₂ w₀
Let's calculate
w₂ = 0.800 2.34 / 0.363
w₂ = 5.16 rev / s
b) The kinetic energy is
K = ½ I w²
Let's reduce to the SI system
w₀ = 0.800 rev / s (2π rad / 1 rev) = 5.026 rad / s
w₂ = 5.16 rev / s (2π rad / 1 rev) = 32.42 rad / s
The initial kinetic energy
K₀ = ½ I₀ w₀²
K₀ = ½ 2.34 5,026²
K₀ = 29.55 J
The final kinetic energy
K₂ = ½ I₂ w₂²
K₂ = ½ 0.363 32.42²
K₂ = 190.88 J
Answer:
Centripetal forces are directed toward the center of a circle.
Hope this helps.
Explanation:
A) 20 m
<h3>What is called magnitude of displacement?</h3>
The magnitude of displacement is defined as the shortest distance between the initial and final position of the object.
For a particle in motion, the magnitude is either less than or equal to the distance travelled.
Also,
Velocity is simply defined as the rate of change of displacement with time.
Mathematically, it can be expressed as:
Velocity = displacement / time
According to the question,
The following data were obtained:
Time = 5 s
Velocity = 4 m/s
Displacement =?
Velocity = displacement / time
4 = d / 5
D = 4 × 5
D= 20 m
Hence,
20 m is the magnitude of the displacement of the object after it travelled for five seconds.
Learn more about magnitude of the displacement here:
brainly.com/question/10919017
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As the density of the unknown substance is 0.68g/0.8ml = 0.85g/ml, it is less dense than the maple syrup at 1.33g/ml and will float.
Answer:
4.6x10^-7 m thickness
Explanation:
See attached handwritten document for more details