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alexandr1967 [171]
3 years ago
13

Which describes the properties reflection, absorption, and transmission when the light is shining on the oval end of a silver sp

oon?
A. It reflects all lights, transmits all light, and absorbs some lights
B. It reflects a lot of light, transmits almost no light, and absorbs some light.
C. It reflects some light, transmits some light, and absorbs almost no light.
D. It reflects almost no light, transmits almost no light, and absorbs almost no light.
Physics
1 answer:
I am Lyosha [343]3 years ago
5 0

B. It reflects a lot of light, transmits almost no light, and absorbs some light.


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A pendulum of mass 5.0 kg hangs in equilibrium. A frustrated student walks up to it and kicks the bob with a horizontal force of
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Answer:

The length is L = 6.206m and the angle is \theta = 37.752^o.

Explanation:

The period T of the pendulum is related to its length L by

T = 2\pi \sqrt{\dfrac{L}{g} },

where g =9.8m/s^2 is the acceleration due to gravity.

Solving for L we get

L = \dfrac{T^2g}{4\pi^2}

putting in T =5.0s and g =9.8m/s^2 we get:

L = \dfrac{(5.0s)^2*9.8m/s^2}{4\pi^2}

\boxed{L = 6.206m.}

There are two forces acting on the pendulum: The gravitational force mg and the F = 30N student's force. Therefore, the angular displacement \theta that these forces give is

sin(\theta ) = \dfrac{F}{mg}

\theta = sin^{-1}( \dfrac{F}{mg})

putting in F =30N, m =5.0kg, and g =9.8m/s^2 we get

\theta = sin^{-1}( \dfrac{30N}{5.0kg*9.8m/s^2})

\boxed{\theta = 37.752^o.}

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