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3 years ago

Which condition describes an object having terminal velocity?

Physics

2 answers:

Natalka [10]3 years ago

6 0

Answer:

C. Gravity = air resistance

Explanation:

An object falling down has two forces acting on him:

- Gravity, which acts downward --> the magnitude of this force is constant (equal to $mg$ , where m is the mass of the object and g is the gravitational acceleration)

- Air resistance, which acts upward --> the magnitude of this force is directly proportional to v, the speed of the object

When the object starts its fall, the speed is zero (v=0) so only gravity acts and it accelerates the object downward. Therefore, the speed of the object increases, and so does the air resistance, until a point where the air resistance becomes equal to gravity (which is constant): when this occurs, the acceleration of the object becomes zero (because forces are balanced), so the object continues its fall at constant velocity, called terminal velocity.

Romashka [77]3 years ago

3 0

<span>C. gravity = air resistance</span>

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Answer:

The longest wavelength in vacuum for which there is constructive interference for the reflected light, λ = 3472.

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Refractive index of Glass (given) = 1.5

For the case of a constructive interference,

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For case 1,

2nt = (m + 1/2) 496 nm

For case 2,

2nt = (m +1+ 1/2) 386 nm

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