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3 years ago

What best describes myotibrils

1 answer:

8 0

Myofibrils are composed of long proteins such as actin, myosin, and titin, and other proteins that hold them together. These proteins are organized into thin filaments and thick filaments, which repeat along the length of the myofibril in sections called sarcomeres. Muscles contract by sliding the thin (actin) and thick (myosin) filaments along each other.

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A dense metal sphere is dropped from a 10-meter tower, and at the exact same time an identical metal sphere is thrown horizontal

givi [52]

Answer:

A. Both spheres land at the same time.

Explanation:

The horizontal motion doesn't affect the vertical motion. Since the two spheres have the same initial vertical velocity and same initial height, they land at the same time.

7 0

3 years ago

Read 2 more answers

Suppose you're on a hot air balloon ride, carrying a buzzer that emits a sound of frequency f. If you accidentally drop the buzz

Olin [163]

Answer:

The correct answer is option 'd': The frequency decreases and the intensity of the sound decreases.

Explanation:

1) <u>Effect on Frequency </u>

According to Doppler's effect of sound we have

for a source of sound moving away from the observer the relation between the observed and the original frequency is given by

$f_{app}=\frac{c-v_{rec}}{c+v_{s}}\times f_{original}$

where

c = speed of sound in air

$v_{rec}$ is the velocity of observer of sound

$v_{s}$ is the velocity of source of sound

$f_{o}$ is the original frequency of sound

As we see the ratio is less than 1 thus the frequency of sound that the observer receives is less than that of source.

2) <u>Effect on Intensity:</u>

At a distance 'r' from source emitting a wave of Power 'P' is given by

$I=\frac{P}{4\pi r^{2}}$

As we see on increasing 'r' intensity of sound decreases.

3 0

4 years ago

A 6.25 L tank holds helium gas at a pressure of 1759 psi. A second 6.25 L tank holds oxygen at a pressure of 467.7 psi. The two

rodikova [14]

Answer:

P=1113.35 psi

Explanation:

For tank 1

V₁= 6.25 L

P₁=1759 psi

For tank 2

V₂=6.25 L

P₂=467.7 psi

Lets take final pressure is P

The final volume V= 6.25 + 6.25 L = 12.5 L

P V = V₂P₂+V₁P₁

Now by putting the values

P V = V₂P₂+V₁P₁

P x 12.5 = 6.25 x 467.7+6.25 x 1759

P=1113.35 psi

So the final volume of the system will be 1113.35 psi.

8 0

3 years ago

What is a successful result of science

Vlada [557]

I think the answer is discovery.

7 0

3 years ago

you weight 650 N. What would you wieght if the Earth were four times as massive as it is and its raduis were three times its pre

LiRa [457]

To solve this problem we will apply the concept given by the law of gravitational attraction, which properly defines gravity under the function

$g = \frac{GM}{r^2}$

Here,

G = Gravitational Universal Constant

M = Mass of Earth

r = Distance between the human and the center of mass of the Earth

The acceleration due to gravity when is 4 times the mass of Earth and 3 times the radius would be given as,

$g_1 = \frac{GM}{r^2}$

$g_2 = \frac{G(4M)}{(3r)^2}$

$g_2 = \frac{4GM}{9r^2}$

$g_2 = \frac{4}{9} g_1$

The weight is defined as

$W = mg_1$

So the new weight would be given as

$W' = mg_2$

$W' = m(\frac{4}{9} g_1 )$

$W' = \frac{4}{9} mg_1$

$W' = \frac{4}{9} W$

$W' = \frac{4}{9}(650)$

$W' = 288.8N$

Therefore the weight under this condition is 288.8N

5 0

3 years ago