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Ivahew [28]
3 years ago
11

The contraction of muscles in the stomach walls

Physics
1 answer:
soldi70 [24.7K]3 years ago
8 0
<span>The contraction of muscles in the stomach walls is called peristalsis. 
Peristalsis works to physically break down food and move it forward.

Hope this works! :)</span>
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Everything is in the pic.
nikitadnepr [17]
The answer is A

Good luck!
3 0
3 years ago
plz tell fast oktwo paragraphs describing the advantages and disadvantages of living in the town.plz tell​
mars1129 [50]

Answer:

There are advantages and disadvantages to living in a small town. You are likely to have more frequent contact with neighbors in a small town than you would in a larger town or city, so it is important to take into account the pros and cons of having privacy. Also take into consideration other factors, including your plans for a family, the career opportunities, your finances, the schools and entertainment options. Your personality will determine whether a small town offers advantages or disadvantages.

Privacy

Many people who reside in small towns enjoy the closeness of knowing their neighbors and the details of neighbors' lives. If a baby is born, a child is ill or a relative dies, people in small towns often want to know about it and be there for you. This can be an advantage, especially if you are lacking a family of your own or enjoy a great deal of socializing. However, if you would rather keep the details of your life to yourself and turn your nose up at idle gossip, small town living might not be for you.

Finances

Jobs can be hard to come by in small towns. You might be required to commute out of town to work but then return to a peaceful environment at the end of a busy day. Housing might be cheaper in small towns, although commuting costs might be higher. Food and child care expenses might be reduced as people are more likely to have gardens and share produce or take turns watching each other's children.

Recreation

One of the disadvantages of a small town is not being close to amusement parks, zoos or museums. However, people in small towns tend to come together during town picnics, festivals or fairs. Depending on your preferences, small towns might provide a relaxed, slower pace when it comes to entertainment compared to the hustle and bustle of a city, where there is constant movement, commotion and entertainment at every corner.

Schools

In a small town, class sizes are usually smaller and teachers and students can get to know each other and their fellow classmates on a deeper level. Many small towns have schools that receive national academic awards or are the highest achieving district in their states. CNN Money ranked Louisville, Colorado as the number one small town in America in 2011 and the school system is academically ranked among the top three in the Denver area. However, some of these towns noted high taxes as a trade-off for the outstanding school systems.

Explanation:

3 0
3 years ago
A 49 kg bear slides, from rest, 11 m down a lodgepole pine tree, moving with a speed of 3.3 m/s just before hitting the ground.
hichkok12 [17]

Answer:

a) \Delta U_g=-5.3kJ

b) K=0.27kJ

c) F_f=0.45kN

Explanation:

the gravitational potential energy is given by:

U_g=m.g.h\\

\Delta U_g=m.g.h_f-m.g.h_i\\\Delta U_g=49kg*9.8m/s^2*(0m-11m)\\\Delta U_g=-5.3kJ

The kinetic energy is given by:

K=\frac{1}{2}m.v^2\\

the initial kinetic energy is zero because the motion started from rest, so:

K=\frac{1}{2}*49kg*(3.3m/s^2)^2\\K=0.27kJ

applying the conservation of energy theorem:

U_g-W_f=K_f\\W_f=-(\Delta K+\Delta U)\\W_F=5.3kJ-0.27kJ\\W_F=-5.0kJ

The work done by the friction force is given by:

W_f=F_f.h.cos(\theta)\\

the angle of the force is 180 degrees because it's against the movement:

F_f=\frac{W_f}{h.cos(\theta)}\\\\F_f=\frac{-5.0kJ}{11m.cos(180^o)}\\\\F_f=0.45kN

8 0
4 years ago
A car accelerates from rest to a velocity of smeters second in 4 seconds What is average acceleration over this period of time
ipn [44]

Answer:

acceleration=s/4

Explanation:

3 0
3 years ago
You are given three radioactive samples (α, β, and γ) and can only dispose of one. The other two you must keep, one in your hand
Dennis_Churaev [7]

Answer:

Keep alpha in hand, keep beta in pocket, dispose of gamma radioactive sample

Explanation:

<u>Alpha particles: </u>

Alpha particles are the particles which cannot penetrate most of the matter. The outer layer of the skin or a piece of paper may be sufficient to stop the alpha particles.

The Radioactive material that emits the alpha particles  can be harmful when they are swallowed, inhaled, or absorbed into blood stream through wounds.

<u>Thus, α radioactive sample can be kept in hand.</u>

<u>Beta particles: </u>

Beta particles are the particles which can be stopped by a few mm of a substance like aluminum layer or by clothing.

Beta particles can penetrate the skin and can cause radiation damage, such as skin burns.

<u>Thus, β radioactive sample can be kept in pocket.</u>

<u>Gamma rays: </u>

Gamma rays are the rays which are penetrating. Many feet of concreted layers or some inches of metal lead are needed to stop them.

Gamma rays are the radiation hazard for the entire human body.

They attack the DNA and can cause lethal defects.

<u>Thus, γ radioactive sample is to be disposed off.</u>

8 0
3 years ago
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