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melisa1 [442]
2 years ago
5

During which segments is kinetic energy decreasing?

Physics
2 answers:
Burka [1]2 years ago
5 0

Answer:

please provide a link or pdf file to complete the assignment i will be more than happy to help. :D

Explanation:

SashulF [63]2 years ago
5 0

Answer:

The answer is C

Explanation:

According to the cooling curve, segments 1, 3, 5 show a decrease in kinetic energy. During these segments, the temperature decreases and, since temperature is measure of the average kinetic energy of molecules, the average kinetic energy decreases as well.

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A green block of mass m slides to the right on a frictionless floor and collides elastically with a red block of mass M which is
Charra [1.4K]

Answer:

M is equal to m

Explanation:

In case we say that the green block's mass m is less than red block's mass M, then the green block would have bounced and moved back to the left instead of coming to rest. The other case where if mass of green block's mass m would have been greater than the red block's mass M, the green block would have kept moving to the right instead of coming to rest. After collision, the red block moves to the right because of exchange of velocities. Therefore, m=M since m comes to rest and M moves to the right

In any collision, as it is asumed that no external forces can act during the collision, momentum must be conserved.

So, if we call p₁ to the momentum before collision, and p₂ to momentum after it, taking into account the information above, we can write the following:

p₁ = mv₁ + M.0 = p₂ = m.0 + Mv₂ ⇒ mv₁ = Mv₂

From the question, we also know that it was an elastic collision.

In elastic collision, added to the momentum conservation, it must be conserved the kinetic energy also.

So, if we call k₁ to the kinetic energy prior the collision, and k₂ to the one after it, we can write the following:

k₁ = 1/2 m(v₁)² + 1/2 M.0 = k₂ = 1/2m.0 + 1/2M(v₂)² ⇒ m(v₁)² = M(v₂)²

Mathematically, the only way in which both equations be true, should be with v₁ = v₂,  which is only possible if m=M too.

In this type of collision, it is said that the energy transfers from one mass to the other.

8 0
3 years ago
What is an observation in an experiment ?
Elza [17]
<span>In science, </span>observation<span> can also involve the recording of data via the use of scientific instruments. The term may also refer to any data collected during the scientific activity.

Hope this helps, 

kwrob</span>
4 0
3 years ago
The swimmer in the pool is making waves when he swims. Choose the sentences that describe both the swimmer’s waves and the waves
devlian [24]

Answer:

B

Explanation:

there moving the waves through energy

3 0
3 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
A skater increases her speed from 5.0 m/s to 10 m/s in 5 seconds. What is the acceleration of the skater?
forsale [732]

Answer:

1 m/s^2

Explanation:

The acceleration of an object is the rate of change of velocity of the object; it is given by:

a=\frac{v-u}{t}

where

u is the initial velocity of the body

v is its final velocity

t is the time elapsed

In this problem, we have:

u = 5.0 m/s is the initial velocity of the skater

v = 10.0 m/s is the final velocity

t = 5 s is the time elapsed

Therefore, the acceleration of the skater is:

a=\frac{10-5}{5}=1 m/s^2

8 0
3 years ago
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