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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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Bill was really bored at work. During his break, he decided to check his carotid artery. He placed both fingers on his neck and
Sergeeva-Olga [200]

Answer:

72 beats per minute

Explanation:

Heart beat causes the flow of blood round the body. This heart beat can be felt as pulse in the wrist or neck carotid artery. The heart rate which is measured in beats per minute (BPM) is used to determine the number of heart beats per minute.

You can calculate your BPM using the carotid artery found in the neck close to the windpipe.

Given that for 20 seconds, Bill had a total of 24 beats.

60 seconds = 1 minute.

Hence,  Bill's BPM = (24 beats per 20 seconds) * (60 seconds per minute) = 72 beats per minute

5 0
2 years ago
A system has 600 j of heat and does 300 j of work. What is the change in internal energy?
Andreas93 [3]

Answer:

The final energy is 1,700 J

Explanation: According to first law of thermodynamics:

=Final energy-initial energy=Change in internal energy

q = heat absorbed or released

w = work done by or on the system

w = work done by the system=  {Work done by the system is negative as the final volume is greater than initial volume}

q = +500J   {Heat absorbed by the system is positive}

w = work done by the system = -300J

Explanation:

5 0
3 years ago
The body needs small amounts of ________ to help enzymes break down proteins.
Inessa [10]

Answer:

I would say vitamin B-6

Explanation:

it is also known as pyridoxine. it helps ebzymes break down protein and carry the dismantled amino acids to the blood stream

Hope this helps ✌✌

4 0
2 years ago
Read 2 more answers
Which statement is true?
DENIUS [597]
Correct Answer is A

In a series circuit, the voltage across each resistive element is different and depends on the resistance of that element. However, the current throughout the series circuit is the same.

In a parallel circuit, the voltage is same across all the branches however the current in each branch is different and depends on the resistance of that branch. 

Points to Remember:
1) In series circuit current remains the same and voltage varies
2) In parallel circuit voltage remains the same and current varies
6 0
3 years ago
A physical science test book has a mass of 2.2 kg what is the weight on the earth
timofeeve [1]

Answer:

21.582 Newtons

Explanation:

The weight of an object on Earth is equal to W=9.81M where M is the mass of the object and the acceleration due to gravity is 9.81 m/s^2. Therefore, the weight of the book on the earth is W=9.81(2.2)=21.582N, or 21.582 Newtons

3 0
3 years ago
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