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3 years ago

What is most often given a value of zero to describe an object’s position on a straight line?

Physics

2 answers:

I am Lyosha [343]3 years ago

6 0

A reference point is most often given a value of 0 to describe an object's position on a straight line

charle [14.2K]3 years ago

4 0

Answer:

Reference point is most often given a value of zero to describe an object's position on a straight line. Positive or negative is assigned to either the right or left of 0 and then the object's current position or displacement calculated accordingly.

Explanation:

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Boxes A and B are in contact on a horizontal, frictionless surface. Box A has mass 21.0 kg and box B has mass 8.0 kg. A horizont

vfiekz [6]

Answer:

2.75 N

Explanation:

Given that,

Box A has a mass 21.0 kg and box B has a mass 8.0 kg.

A horizontal force of 100N is exerted on box A.

Let a be the acceleration of the system. Using second law of motion,

$F=(m_A+m_B)a\\\\a=\dfrac{F}{(m_A+m_B)}\\\\a=\dfrac{10}{(21+8)}\\\\a=0.344\ m/s^2$

Now applying Newton's second law to box B. So,

$F_A=m_Ba\\\\=8\times 0.344\\\\=2.75\ N$

So, 2.75 N is the force that box A exerts on box B.

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3 years ago

A particular person's eardrum is circular, with a diameter of 7.90 mm. How much sound energy (in J) is delivered to an eardrum i

antiseptic1488 [7]

Answer:

$4.90167\times 10^{-17}\ J$

Explanation:

I = Hearing intensity = $1\times 10^{-12}\ W/m^2$

A = Area = $\pi r^2$

d = Diameter = 7.9 mm

r = Radius = $\dfrac{d}{2}=\dfrac{7.9}{2}=3.95\ mm$

Power is given by

$P=IA\\\Rightarrow P=1\times 10^{-12}\times \pi \times (3.95\times 10^{-3})^2\\\Rightarrow P=4.90167\times 10^{-17}\ W$

t = Time the eardrum is exposed to sound = 1 second

Energy is given by

$E=Pt\\\Rightarrow E=4.90167\times 10^{-17}\times 1\\\Rightarrow E=4.90167\times 10^{-17}\ J$

The energy transferred to the eardrum is $4.90167\times 10^{-17}\ J$

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3 years ago

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A is the correct answer

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3 years ago

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michael boarded a plane and flew for 2 hours over a distance of 900 miles he then returned home on another 2 hour plane ride tra

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Adding both distances together, you get a total of 1800 miles. With the total travel time of 4 hours, you divide the distance traveled by the time it took. so 1800/4=450 mph

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3 years ago

How many arrows of force would be needed in a free body diagram of a rocket taking off from the moon? Ignore any solar system ob

Sophie [7]

When rocket is launched from the moon then there will be two forces on the rocket

1. Due to ejected gases the reaction force on rocket in forward direction

2. due to gravitational attraction of moon

So here we need to draw two arrow on its FBD in which first arrow is in the direction of motion of rocket which will be the reaction force on it while other arrow is opposite to its motion which is due to gravitational attraction force.

So answer would be TWO

When crate is placed on the floor then in order to lift the crate upwards we always need an external force that will counter balance the normal force of crate.

Which mean if we make the normal force to be zero then crate will lift upwards and in order to make it zero we need to apply same force as that of normal force

So here the normal force is given as 150 N so we also need to apply 150 N force in order to lift it upwards

If a person lift a box upwards by some force then we can say by force balance

Force applied by person + Normal force = Weight of the box

$F_{app} + F_n = mg$