Nêu 2 ví dụ cho mỗi trường hợp sau: vật chuyển động,đứng yên,chuyển động do với vật này đứng yên so với vật khác,chuyển động thẳng,chuyển động cong,chuyển động tròn.

Answers

Answer 1

Answer:

Answer:

Hai ví dụ như sau:

a) Vật thể chuyển động - Phương tiện di chuyển, Người đàn ông đi bộ

b) ở trạng thái nghỉ - Xe đứng, người ngồi

c) Chuyển động vì một vật đứng yên so với một vật khác - Một người đàn ông ngồi trên sân ga đứng yên so với đoàn tàu đang chuyển động, Một ô tô chuyển động ngang qua những ngôi nhà đang đứng yên

d) chuyển động thẳng - Đi bộ trên đường, chuyển động lên trên

e) chuyển động cong - Chạy trên đường tròn, đạn bắn ra từ súng

f) chuyển động tròn đều - Xe chuyển động trên đường cong, êlectron chuyển động vuông góc với từ trường đều

Explanation:

Hai ví dụ như sau:

a) Vật thể chuyển động - Phương tiện di chuyển, Người đàn ông đi bộ

b) ở trạng thái nghỉ - Xe đứng, người ngồi

d) chuyển động thẳng - Đi bộ trên đường, chuyển động lên trên

e) chuyển động cong - Chạy trên đường tròn, đạn bắn ra từ súng

f) chuyển động tròn đều - Xe chuyển động trên đường cong, êlectron chuyển động vuông góc với từ trường đều

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Which of the following best describes a direct current

Answers

Direct current-is the unidirectional flow or movement of electric charge carries(which are usually electrons.

its an unidirectional flow of electric charge

hope this helps!

Which describes the relationship between potential and kinetic energy of a ball thrown up in the air as it falls back to the ground? A.
Gravitational potential energy increases; kinetic energy increases.

B.
Kinetic energy equals gravitational potential energy.

C.
Kinetic energy increases; gravitational potential energy decreases.

D.
The mass of the ball is required to answer this.

Answers

The ball originally contains potential energy and no kinetic energy, therefore we can use the theory of conservation of mechanical energy. Its total energy, which is made up of the KE and PE, is constant and equal to its starting PE as it falls. Thus, option C is correct.

What potential and kinetic energy of a ball thrown up?

As the ball falls toward the ground, its gravitational potential energy is transformed into kinetic energy. The kinetic energy of the ball will increase as it accelerates until it collides with something. The ball's collision generates kinetic energy, which is transformed into several forms of energy.

As it rises, the ball's speed slows until the very apex of its motion, where it briefly pauses. At the peak, it accelerates at -9.8 m/s2.

Therefore, A ball is thrown up into the air, yet although though it rises into the air, the direction, and velocity of the ball are actually downward.

Learn more about kinetic energy here:

brainly.com/question/26472013

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The answer is c, because ball is falling so its gravitationl potential energy decreases, but it kinetic energy increases. Energy is always conserved.

A cyclist rides in a circle with speed 8.1 m/s. What is his centripetal acceleration if the circle has a radius of 27 m? A. 3.3 m/s^2 B. 2.4 m/s^2 C. 0.3 m/s^2 D. 1.8 m/s^2

Answers

The answer would be B. 2.4

You're welcome.

Answer:

Answer is B. Just took it!

Explanation:

Explain why it’s hurt more carrying a heavy bag with a string of wire

Answers

Explanation:

Carrying a heavy bag with a string of wire can cause more pain compared to carrying a bag without a string of wire due to a few reasons.

Firstly, the presence of the string of wire adds additional pressure and strain on your hand, making it harder to grip and carry the bag comfortably. The wire can dig into your skin and cause discomfort or even pain. Imagine holding a bag with a smooth handle versus holding a bag with a sharp wire cutting into your hand - the latter would definitely be more painful.

Secondly, the wire can create friction against your skin. As you carry the bag and walk, the movement can cause the wire to rub against your hand, resulting in irritation and potentially even blisters. This friction can also cause the wire to dig deeper into your skin, intensifying the pain.

Lastly, the weight distribution of the bag can be affected by the presence of the wire. When you carry a heavy bag, it is ideal for the weight to be evenly distributed to minimize strain on specific areas of your body. However, the wire can create an uneven distribution of weight within the bag. This can lead to increased pressure and discomfort on certain parts of your hand, making it more painful to carry the bag.

In summary, carrying a heavy bag with a string of wire can hurt more due to the additional pressure and strain on your hand, the friction caused by the wire rubbing against your skin, and the uneven weight distribution within the bag. It is important to consider these factors when carrying heavy objects to minimize discomfort and potential injury.

Phileas Fogg, the character who went around the world in 80 days, was very fussy about his bathwater temperature. It had to be exactly 38.0o C. You are his butler, and one morning while checking his bath temperature, you notice that it’s 42.0oC. You plan to cool the 100.0 kg of water to the desired temperature by adding an aluminum-duckie originally at freezer temperature (-24.0oC). Of what mass should the Al-duckie be? [Specific heat of Al = 0.900 J/(goC); density of water =1 .00 g/ml]. Assume that no heat is lost to the air

Answers

Answer:

The mass of the Al-duckie should be 30 kg.

Explanation:

We will use the first law of thermodynamics:

ΔU = m·Cv·ΔT

Since the specific heat of water is 4.185 J(gºC), the change in the water's internal energy would be:

ΔU = 100 kg · 4.185 J(gºC) · (42ºC - 38ºC) = 1674 KJ

Given that no heat is lost, all the internal energy that the water loses while cooling down will transfer to the duckie. So, if the duckie has ΔU = 1674 KJ and its final temperature is the desired 38 ºC, we can calculate its mass using the first law again:

$m=\frac{\Delta{U}}{Cv{\Delta{T}}}=(1674)/(0.9*[38-(-24)])=30Kg$

If the absolute temp of gas is 600k what is the temp in degrees celsius

Answers

The answer is 327 degrees celsius

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