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Mice21 [21]
3 years ago
7

Hannah just finished building a house of cards that stands four stories high. She is worried that it will fall down. Which of th

e following statements must be true?
If no unbalanced force acts upon the house of cards, then it will remain standing forever.
As long as nobody touches the house of cards, it will remain standing.
If Hannah adds another card to the house of cards, then it will fall down.
A house of cards is too fragile and must fall down eventually due to gravity.
Physics
2 answers:
Tju [1.3M]3 years ago
6 0
A.) <span>If no unbalanced force acts upon the house of cards, then it will remain standing forever.

[ Other Statements doesn't make any sense in Physics, they can be true in some situation & can't be false, option A is the only answer ]
Hope this helps!</span>
Morgarella [4.7K]3 years ago
6 0

Answer: If no unbalanced force acts upon the house of cards, then it will remain standing forever.

Explanation:

From Newton's first law we understand that for an object to change its state of rest or motion, an external unbalanced force must act on it.

In the given situation, the house of cards is at rest and would remain at rest until and unless an unbalanced external force acts on it. Thus, till then it would remain standing still.

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A 0.2 kg hockey park is sliding along the eyes with an initial velocity of -10 m/s when a player strikes it with his stick, caus
babunello [35]

Answer:

The impulse applied by the stick to the hockey park is approximately 7 kilogram-meters per second.  

Explanation:

The Impulse Theorem states that the impulse experimented by the hockey park is equal to the vectorial change in its linear momentum, that is:

I = m\cdot (\vec{v}_{2} - \vec{v_{1}}) (1)

Where:

I - Impulse, in kilogram-meters per second.

m - Mass, in kilograms.

\vec{v_{1}} - Initial velocity of the hockey park, in meters per second.

\vec{v_{2}} - Final velocity of the hockey park, in meters per second.

If we know that m = 0.2\,kg, \vec{v}_{1} = -10\,\hat{i}\,\left[\frac{m}{s}\right] and \vec {v_{2}} = 25\,\hat{i}\,\left[\frac{m}{s} \right], then the impulse applied by the stick to the park is approximately:

I = (0.2\,kg)\cdot \left(35\,\hat{i}\right)\,\left[\frac{m}{s} \right]

I = 7\,\hat{i}\,\left[\frac{kg\cdot m}{s} \right]

The impulse applied by the stick to the hockey park is approximately 7 kilogram-meters per second.  

8 0
3 years ago
A cement truck of mass 14,000 kg moving 10m/s slams into a wall and comes to a halt in .2s. What is the force of impact on the t
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When an object is fully magnetized, all of its magnetic domains will be ?
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The answer is to this question D
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3 years ago
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Which of the following is true? A. If an equal force is applied to two objects, the object with greater mass will accelerate mor
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I hope this helps and have a wonderful day filled with joy!!


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3 years ago
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melomori [17]

Answer:

A. Their same forces repel each other, and their opposite forces attract each other.

Explanation:

As we know by the property of electric charge that similar charges repel each other and opposite charges attracts each other

So here we have similar situation in magnets also

Two similar poles or like poles of magnet i.e. North - North poles or South - South poles always repel each other

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SO here correct answer is

A. Their same forces repel each other, and their opposite forces attract each other.

8 0
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