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Gwar [14]
3 years ago
14

An ice skater can change the rate of their spin by moving their arms into and away from their body without any other forces or t

orques. Explain this in terms of angular momentum.
Physics
1 answer:
pychu [463]3 years ago
3 0

Answer:

Angular momentum is conserved if there are no external forces

P1 = P2

I1 ω1 = I2 ω2

ω2 / ω1 = I1 / I2

If the skater pulls their arms in (I2 < I1) then the angular speed must increase for angular momentum to be conserved.

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5 0
4 years ago
A block of gelatin is 120mm by 120mm by 40mm whrn unstressed. A force of 49N is applied tangentially to the upper surface causin
Inessa05 [86]

Answer:

The shearing stress is 10208.3333 Pa

The shearing strain is 0.25

The shear modulus is 40833.3332 Pa

Explanation:

Given:

Block of gelatin of 120 mm x 120 mm by 40 mm

F = force = 49 N

Displacement = 10 mm

Questions: Find the shear modulus, Sm = ?, shearing stress, Ss = ?, shearing strain​, SS = ?

The shearing stress is defined as the force applied to the block over the projected area, first, it is necessary to calculate the area:

A = 40*120 = 4800 mm² = 0.0048 m²

The shearing stress:

Ss=\frac{F}{A} =\frac{49}{0.0048} =10208.3333Pa

The shearing strain is defined as the tangent of the displacement that the block over its length:

SS=tan\theta =\frac{Displacement}{L}  =\frac{10}{40} =0.25

Finally, the shear modulus is the division of the shearing stress over the shearing strain:

Sm=\frac{10208.3333}{0.25} =40833.3332Pa

6 0
4 years ago
a car moving with 72 km/hr towards east and another car with 90km/hr towards west find relative of A w.r to B​
hodyreva [135]

Answer:

please tell me what does w.r mean ? then I will try to give answer

7 0
3 years ago
1. The center of gravity of both cats and humans is roughly in the thoracic region. However, they each bear their weight very di
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Answer:

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Which term describes the number of troughs that pass a point in a given amount of time?
artcher [175]

Answer:

Frequency (f) can be defined as the number of waves or crests or number of troughs that pass a point per unit second. It can be measured in Hertz (Hz) or 1/s.

6 0
3 years ago
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