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Kaylis [27]
3 years ago
13

When we apply the energy conversation principle to a cylinder rolling down an incline without sliding, we exclude the work done

by friction because: A. there is no friction present B. the angular velocity of the center of mass about the point of contact is zero C. the coefficient of kinetic friction is zero D. the linear velocity of the point of contact (relative to the inclined surface) is zero E. the coefficient of static and kinetic friction are equal
Physics
1 answer:
NikAS [45]3 years ago
5 0

Answer:

D. the linear velocity of the point of contact (relative to the inclined surface) is zero

Explanation:

The force of friction emerges only when there is relative velocity between two objects . In case of perfect rolling , there is no sliding so relative velocity between the surface and the point of contact is zero . In other words the velocity of point of contact becomes zero , even though , the whole body is in linear motion . It happens due  point of contact having two velocities which are equal and opposite . One of the velocity is in forward direction and the other velocity which is due to rotation is in backward direction . So net velocity of point of contact becomes zero . Due to absence of sliding , displacement due to friction  becomes zero . Hence work done by friction becomes zero.

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Answer:

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3 years ago
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skad [1K]
Vertical forces:
There is a force of 579N acting upward, and a force of 579N
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7 0
3 years ago
Fiber optics are an important part of our modern internet. In these fibers, two different glasses are used to confine the light
motikmotik

Answer:

n_cladding = 1.4764

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θ_c = 90° - 5°

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Now, critical angle is given by;

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sin θ_c = (n_cladding/n_core)

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3 years ago
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