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3 years ago

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A stone is thrown in the upwards direction at the velocity of 4 m/s. It attains a certain height and then it falls back. During

its motion, it experienced an acceleration of 10 m/s2 in the downward direction. What is the maximum height it attained before falling back?

1 answer:

Sati [7]3 years ago

3 0

Answer: 0.8 m

Explanation:

Velocity of throw = 4m/s

Maximum Height attained(h) =?

Downward acceleration experienced = 10m/s^2

Using the relation:

v^2 = u^2 + 2aS

v = final Velocity = 0 (at maximum height)

u = Initial Velocity = 4

a = g downward acceleration = - 10

0 = 4^2 + 2(-10)(S)

0 = 16 - 20S

20S = 16

S = 16 / 20

S = 0.8m

Maximum Height attained = 0.8m

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A light horizontal spring has a spring constant of 105 N/m. A 2.00 kg block is pressed against one end of the spring, compressin

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Answer:

The the coefficient of kinetic friction between the horizontal surface and the block is 0.536.

Explanation:

Given that,

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Using relation between friction force and restoring force

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Put the value into the relation

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Explanation :

Speed of car, $v_1=50\ km/h=13.8\ m/s$

Kinetic energy of the car, $KE_1=400\ J$

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Let $KE_2$ is the kinetic energy of the car when it is moving with 100 km/h.

$\dfrac{KE_1}{KE_2}=\dfrac{\dfrac{1}{2}mv_1^2}{\dfrac{1}{2}mv_2^2}$

$\dfrac{KE_1}{KE_2}=\dfrac{v_1^2}{v_2^2}$

$KE_2=KE_1(\dfrac{v_2}{v_1})^2$

$KE_2=400\ J\times (\dfrac{27.7\ m/s}{13.8\ m/s})^2$

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t is same. So,

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A human hair is approximately is 50um in diameter. express this diameter in meters

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50 μm = 5 × 10⁻⁵ m in diameter

<h3>Steps</h3>

1μm = 1 x $10^{-6}$ m

<h3>Given</h3>

1μm = 1 x $10^{-6}$ m

50μm = 50 x $10^{-6}$ m

50μm = 50 x 10 x $10^{-6}$

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<h3>Conclusion</h3>

A human hair is approximately 50 μm = 5 × 10⁻⁵ m in diameter

<h3>How big is a human hair on average?</h3>

between 17 and 181 micrometers

The typical diameter of human hair can range from 17 micrometers to 181 micrometers, according to research. Using 50 micrometers as an average figure for its diameter, this translates to 50,000 nanometers.

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The finest hair is flaxen, with a diameter ranging from 1/1500 to 1/500 of an inch. the coarsest hair is black, measuring between 1/450 and 1/140 of an inch.

learn more about human hair diameter here

<u>brainly.com/question/13147893</u>

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