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3 years ago

8

Tính số phần trăm phân tử khí trong trọng trường của Trái Đất, có thế năng ep, lớn hơn động năng trung bình chuyển động tịnh tiế

n của chúng. Giả sử rằng nhiệt độ của khí và gia tốc của trọng lực không phụ thuộc vào độ cao

1 answer:

vekshin13 years ago

4 0

Answer:

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A sailboat is moving across the water at 3.0 m/s. A gust of wind fills its sails and it accelerates at a constant 2.0 m/s2. At t

Flauer [41]

Answer:

v = 9 m/s

Explanation:

It is given that,

Initial speed of the sailboat, u = 3 m/s

Acceleration of the sailboat, $a=2\ m/s^2$

Initial speed of the motorboat, u = 0

Acceleration of the motorboat, $a=4\ m/s^2$

Time elapsed, t = 3 s

To find,

The velocity of the sailboat

Solve,

Let v is the velocity of the sailboat after 3 seconds. By using the equation of kinematics, it can be calculated.

$v=u+at$

$v=3\ m/s+2\ m/s^2\times 3\ s$

v = 9 m/s

Therefore, the velocity of the sailboat is 9 m/s.

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3 years ago

A 0.20-kg block rests on a frictionless level surface and is attached to a horizontally aligned spring with a spring constant of

solmaris [256]

Answer:

$0.57 ms^{-1}$

Explanation:

k = spring constant of the spring = 40 Nm⁻¹

A = amplitude of the simple harmonic motion = 4 cm = 0.04 m

m = mass of the block attached to spring = 0.20 kg

w = angular frequency of the simple harmonic motion

Angular frequency of the simple harmonic motion is given as $w = \sqrt{\frac{k}{m} } \\w = \sqrt{\frac{40}{0.20} }\\w = 14.14 rads^{-1}$

$v$ = Speed of the block as it pass the equilibrium point

Speed of the block as it pass the equilibrium point is given as

$v = A w\\v = (0.04) (14.14)\\v = 0.57 ms^{-1}$

6 0

3 years ago

if the intensity of a person's voice is 4.6 x 10^-7 w/m^2 at a distance of 2.0 m, how much sound power does that person generate

777dan777 [17]

The sound power the person generated is $2.313 \times 10^{-5} \ W$ .

<h3>Area of the sound wave</h3>

The area of the sound wave is calculated as follows;

$A = 4\pi r^2\\\\A = 4 \pi \times (2)^2\\\\A = 50.272 \ m^2$

<h3>Power generated</h3>

The sound power the person generated is calculated as follows;

$P = I A\\\\P = 4.6\times 10^{-7} \ W/m^2 \ \ \times \ \ 50.272 \ m^2\\\\P = 2.313 \times 10^{-5} \ W$

Learn more about intensity of sound here: brainly.com/question/4431819

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2 years ago

What was the greatest discovery by galileo during his inclined-plane experiments?

Sergeeva-Olga [200]

Galileo discovered during his inclined-plane experiments that a ball rolling down an incline and onto a horizontal surface would roll indefinitely.

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3 years ago

HELP When the forces are applied in the same direction, how do you determine net force?

aleksklad [387]

Answer:

Explanation:

If two forces act on an object in the same direction, the net force is equal to the sum of the two forces.

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3 years ago