Physics, 23.08.2019 02:30 joseroblesrivera123

A57 g ice cube can slide without friction up and down a 33 ∘ slope. the ice cube is pressed against a spring at the bottom of the slope, compressing the spring 12 cm . the spring constant is 20 n/m . when the ice cube is released, what distance will it travel up the slope before reversing direction?

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The springs stored energy is transferred to the cube as kinetic energy and then by the slop the KE is converted to height energy.

0.5 . k . x^2 = 0.5 . m . v^2 = m . g . ∆h

0.5 . 50 . (0.1^2) = 0.05 . 9.8 . ∆h

∆h = 0.51 m = 51 cm

This is the height gained
Distance along the slope = ∆h / sin 60 = 0.589 = 59 cm

In the second case, the stored spring energy is converted into height energy AND frictional heat energy.

The height energy is m . g . d sin 60 where d is the distance the cube moves along the slope.

The Frictional energy converted is F . d

F ( the frictional force ) = µ . N

N ( the reaction to the component of the gravity force perpendicular to the surface of the slope ) = m . g . cos60

Total energy converted

0.5 . k . x^2 = (m . g . dsin60) + (µ . m . g . cos60 . d )

Solve for d

d = 0.528 = 53 cm

Answer from: Quest

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electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

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A57 g ice cube can slide without friction up and down a 33 ∘ slope. the ice cube is pressed against...

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