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IrinaK [193]
2 years ago
9

Even if there were some friction on the ice, it is still possible to use conservation of momentum to solve this problem, but you

would need to impose an additional condition on the problem. What is that additional condition
Physics
1 answer:
hjlf2 years ago
6 0

The problem referred to in this question is missing and it is;

Two hockey pucks of identical mass are on a flat, horizontal ice hockey rink. The red puck is motionless; the blue puck is moving at 2.5 m/s to the left. It collides with the motionless red puck. The pucks have a mass of 15 g. After the collision, the red puck is moving at 2.5 m/s, to the left. What is the final velocity of the blue puck?

Answer:

The condition is that p_f - p_i which is the change in momentum will not be equal to zero but equal to the impulse (Ft).

Explanation:

In the problem described, by inspection, we can say that since there is no friction, we have a closed system and thus momentum is conserved.

Since momentum is conserved, we can say that;

Initial momentum(p_i) = final momentum(p_f)

Now, in this question we are told that some friction wants to be introduced on the ice and it's possible to still use conservation of momentum.

From impulse - momentum theory, we know that;

Impulse = change in momentum

Impulse is zero when no force is acting on the ice and we have; 0 = p_f - p_i

This will yield initial momentum = final momentum.

Now, since a force is applied, we know that impulse is; J = F × t

Thus;

Ft = p_f - p_i

Where F is the force due to friction.

Thus, the condition is that p_f - p_i will not be equal to zero

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Modern nuclear bomb tests have created an extra high level of14C in our atmosphere. When future archaeologistsdate samples from
Ipatiy [6.2K]

Answer:

Too old(Ex. if real time is 1000 then they estimate >1000)

Explanation:

This is because with time our planet may have a definite function which describes temperature.(Because of all the factors and global warming except nuclear bomb testing)

Now nuclear test on planet have significant effect on temperature rise.

Also 14°C rise in temperature is good one because of this.

If future archaeologists only consider that  uniform function as above mentioned then they estimate more time then the real one.

Thus too old is right answer.

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3 years ago
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What is a force that opposes motion between two surfaces that are in contact?
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Answer:

Friction is a force that opposes motion.

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What is the relationship between DNA and mutation
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Answer:

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5 0
3 years ago
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A 21500 kg jet airplane is flying through some high winds. At some point in time, the airplane is pointing due north, while the
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Answer:\theta =79.47 North\ of\ west

Explanation:

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Force from wind is 14900 N at angle of 75 south of west

Resolving forces

F_x=14900cos75=-3856.403 N

F_y=35100-14900sin75

F_y=35100-14392.29=20707.70 N

Therefore acceleration in x direction

a_x=\frac{F_x}{m}=\frac{-3856.403}{21500}=-0.179 m/s^2

a_y=\frac{F_y}{m}=\frac{20707.70}{21500}=0.963 m/s^2

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tan\theta =\frac{a_y}{a_x}=\frac{0.963}{0.179}=-5.38

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