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givi [52]
3 years ago
7

Jessica took a mylar balloon outside on a very cold day. As she waited for the bus the balloon began to shrink. What is the best

explanation of this?
Physics
1 answer:
marin [14]3 years ago
7 0
As she filled the balloon up with air, the air, let’s say, was at room temperature and therefore was able to expand and fill the balloon. When air inside of the balloon was exposed to the cold air. The air molecules started to contract or come closer together. This causes the air to fill less area inside of the balloon and therefore making the balloon smaller.
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If you place one staple on an electronic balance, the balance still reads 0.0 grams. However, if you place
Tasya [4]
Mass of 1 staple = 6.8 g/210 staples
mass of 1 staple  = 0.032380952 g
Hope that helps!!
4 0
3 years ago
Read 2 more answers
An student writes a bird that is divining for prey has speed of _ 10m/s what is wrong with the statement.
Anika [276]

Answer:

The description including its issue is summarized throughout the clarification portion below.

Explanation:

  • Speed would be a measurement of size. Which has only significance and therefore no path or guidance. Student says acceleration of -10m/s, therefore this assumption is incorrect because this same negative correlation indicates the path.
  • In reality, this same participant defined the speed (which seems to have two very different motion of an object).

4 0
2 years ago
Which of the following is considered an individual sport?
Otrada [13]

Answer:

wrestling

Explanation:

You might have a team but it's only you and the other person on the mat so you are alone

3 0
2 years ago
Nuclear fusion is more reliable and sustainable source of energy than nuclear fission chain reaction justify this statement with
nata0808 [166]

Answer:

1. Nuclear fusion does not generate radioactive nuclear wastes as nuclear fission does.

2. Nuclear fusion cannot lead to disastrous powerplant explosions as nuclear fission does.

3. More energy is generated during nuclear fusion than in nuclear fission.

Explanation:

Nuclear fusion involves the combination of lighter atoms such as hydrogen to form a heavier nucleus, in the process producing a tremendous amount of energy.

Nuclear fission on the other hand involves splitting a heavy nucleus into two lighter nuclei, releasing energy in the process.

  • Nuclear fusion can be more reliable than nuclear fission in energy generation due to the following reasons:
  • There are no radioactive waste products obtained as a result of nuclear fusion, unlike nuclear fission. This is because the elements involved in Nuclear fusion are relatively radioactively stable elements.
  • The risk of nuclear powerplant explosion due to out of control chain reactions is reduced in nuclear fusion because the reaction can only occur in perfect conditions under high pressure and temperatures <em>(e.g the sun)</em>. When any of these conditions is removed due to a fault, the reaction automatically stops.
  • More energy is generated during nuclear fusion than in nuclear fission.
4 0
2 years ago
The lightest and heaviest flying birds are the bee hummingbird of Cuba, which weighs about 1.6 grams, and the great bustard of E
VMariaS [17]

Answer:

for the birds to be able to stay vertical in flight without falling down to earth, they must produce a lift that will counteract their weight

for the small bee humming bird,

mass = 1.6 g = 1.6 x 10^{-3}  kg

weight of the bird under acceleration due to gravity = mg

where g = acceleration due to gravity = 9.81 m/s^2

weight of the bird = 1.6 x 10^{-3}  x 9.806 = 0.0156 ≅ 0.016 N

for this bird to maintain flight, the least lift upward, it must generate must be equal to its weight downwards, i.e

lift = weight

therefore,

lift = <em>0.016 N</em>

<em></em>

For the bustard of Europe and Asia,

mass = 21 kg

weight of the bird under acceleration due to gravity = mg

weight of the bird = 21 x 9.806 = 205.9 N

lift = weight =  <em>205.9 N</em>

<em></em>

<em>lift generated is proportional to the wing surface area according to the lift equation</em>

L = Cs x p x \frac{v}{2} x S

where L = lift

C = lift coefficient

p = density of air

v = relative velocity of bird and air

S = surface are of the wing.

<em>The great bustard will have a proportionally larger wing area to hold its weight in flight</em>

<em></em>

7 0
3 years ago
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