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2 years ago

ماهي قوة التركيز من العين عندما ينضر الكاءن من ٢٠ الى ٥٠٠ من عينه

Physics

1 answer:

Debora [2.8K]2 years ago

4 0

Answer:

What is the power of focus from the eye when a subject looks from 20 to 500 from its eye?

Explanation:

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A 3.00-kg box is sliding along a frictionless horizontal surface with a speed of 1.8 m/s when it encounters a spring. (a) Determ

aniked [119]

Answer:

a) k= 3594,7 N/m

b) v= 0.55 m/s

Explanation:

a)
As the surface is horizontal, the only change in energy will be the change in kinetic energy, as the box comes to an stop after compressing the spring.
As we know that the surface is frictionless also, this change in kinetic energy must be equal to the change in the elastic potential energy of the spring.
So we can write the following equality:

$\Delta K = \Delta U$

where $\Delta K = \frac{1}{2}*m*v^{2}$

and $\Delta U = \frac{1}{2} * k* \Delta x^{2}$

Simplifying and replacing by the values, we get:

$3.00 kg* (1.8 m/s)^{2} = k* (0.052 m) ^{2}$

Solving for k:

$k = \frac{3.00kg*(1.8m/s)^{2} }{(0.052m)^{2}} = 3594.7 N/m$

k = 3594.7 N/m

b)
For this part, we can just apply the same equality, replacing the value of k by the one we got, and solving for the initial speed v:

$v = \sqrt{\frac{k*\Delta x^{2}}{m} } = \sqrt{\frac{3594.7N/m*(0.016m)^{2} }{3.00kg}} = 0.55 m/s$

v = 0.55 m/s

6 0

2 years ago

A robin flies a distance of 45963 cm. How far has it flown in kilometers?

alina1380 [7]

Answer:

0.46km

Explanation:

45963cm/100cm=459.63m/1000m=0.45963 or 0.46km

6 0

2 years ago

Which statement is true for objects in dynamic equilibrium?

lakkis [162]

Answer:

The correct answer to the question is objects have zero acceleration.

Explanation:

Before answering the question, first we have to understand dynamic equilibrium .

A body moving with uniform velocity is said to be in dynamic equilibrium if the net external forces acting on the body is zero. Hence, the body is under balanced forces.

If the external forces acting on a body is not balanced, then the body will accelerate which will destroy its equilibrium condition. Hence, the necessary and sufficient condition for a body to be in dynamic equilibrium is that the forces are balanced.

When a body is in dynamic equilibrium, the body moves with uniform velocity along a straight line unless and until it is compelled by some external unbalanced forces.

Hence, the rate of change of velocity or acceleration of the body will be zero.

5 0

3 years ago

Read 2 more answers

I WILL GIVE U A BRAINLIEST

Step2247 [10]

Answer:

answer is B

Explanation:

The table below shows the wavelengths for some electromagnetic waves

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2 years ago

A 5.0 kg block hangs from the ceiling by a mass-less rope. A Second block with a mass of 10.0 kg is attached to the first block

gayaneshka [121]

The tension in the first and second rope are; 147 Newton and 98 Newton respectively.

Given the data in the question

Mass of first block; $m_1 = 5.0kg$

Mass of second block, $m_2 =10kg$

Tension on first rope; $T_1 =\ ?$

Tension on second rope; $T_2 =\ ?$

To find the Tension in each of the ropes, we make use of the equation from Newton's Second Laws of Motion:

$F = m\ *\ a$

Where F is the force, m is the mass of the object and a is the acceleration ( In this case the block is under gravity. Hence ''a" becomes acceleration due to gravity $g = 9.8m/s^2$ )