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harina [27]
3 years ago
7

A firecracker is placed in the middle of a cluster of stationary billiard balls. The firecracker-billiard ball system sits on a

frictionless surface. As the firecracker explodes, the balls scatter. Assuming no air resistance, what is the momentum of the system after the explosion of the firecracker?
a) greater than the momentum of the system before the explosion
b) equal to the combined speed of the balls
c) equal to the mass of the balls
d) zero
Physics
2 answers:
Tju [1.3M]3 years ago
8 0

Momentum is one of those things that are 'conserved' (like energy). That means the total amount of momentum in an isolated system is the same after some event as it was before the event.

Before the ear-splitting explosion, while the firecracker and the billiard balls were just sitting there on the frictionless table, the momentum of the system was zero, because nothing was moving.  Right there, that tells us that the total momentum of all the balls and the fragments of the firecracker ... if you add up all the momentum vectors AFTER the explosion ... the sum is still zero. (D)

Mekhanik [1.2K]3 years ago
3 0

According to law of conservation of momentum, the momentum of the fire cracker – billiard ball system will be zero.

Answer: D

Explanation:

As we know that before the explosion the total momentum exhibited by the fire cracker and billiard board system is zero as both the objects are at rest.

As explosion is an internal force of the fire cracker, which on hitting the billiard balls will make them fall in different directions.

So the speed at which the balls will be falling at different directions will have same magnitude but different directions. And the mass of the balls will be same.

So the total momentum of the fire-cracker and billiard ball system will be zero as momentum is a vector quantity which considers the magnitude and direction of the speed of the balls.

Thus the total momentum after explosion will be zero.  

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A spaceship is travelling at 20,000.0 m/s. After 5.0 seconds, the rocket thrusters are turned on. At the 55.0 second mark, the s
tankabanditka [31]

Answer:

80 m/s^2

Explanation:

The acceleration of an object is given by:

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

where

v is the final velocity

u is the initial velocity

t is the time interval it takes for the velocity to change from u to v

For the rocket in this problem,

u = 20,000 m/s

v = 24,000 m/s

t = 55.0 - 5.0 = 50.0 s

Substituting,

a=\frac{24000-20000}{50}=80 m/s^2

7 0
3 years ago
A sample of gas has an initial volume of 4.5 L at a pressure of 754 mmHg . Part A If the volume of the gas is increased to 8.5 L
Firdavs [7]

Answer:

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6 0
3 years ago
Which quantity and unit are INCORRECTLY paired?
liq [111]
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Which of the statements best describes density?
Vesnalui [34]

Answer:

The answer to your question is: letter D.

Explanation:

a.The mass that a mole of substance has, measured in grams per mole.  Density is not measure in moles, so this is not the correct answer.

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c.The mass of substance dissolved in a liquid, measured in grams per milliliter.  I think that this definition is correct but is incomple, so this answer is wrong.

d.The ratio of a substance's mass to its volume, measured in grams per milliliter and also equivalent to grams per cubic centimeter. This is the right description to density, so this is the correct answer.

8 0
3 years ago
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