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2 years ago

What does the law of conservation of matter state

Physics

1 answer:

r-ruslan [8.4K]2 years ago

3 0

Answer:

Matter can be changed, but not created or destroyed.

Explanation:

Matter can change for through physical and chemical changes, though this happens, matter is conserved. The same amount of matter exists before and after the change.

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In a real system of levers, wheels, or pulleys, the AMA is less than the IMA because _____.

grandymaker [24]

In a real system of levers, wheel or pulleys, the AMA (actual mechanical advantage) is less than the IMA (ideal mechanical advantage) because of the presence of friction.

In fact, the IMA and the AMA of a machine are defined as the ratio between the output force (the load) and the input force (the effort):
$IMA= \frac{F_{out}}{F_{in}}$
however, the difference is that the IMA does not take into account the presence of frictions, while the AMA does. As a result, the output force in the AMA is less than the output force in the IMA (because some energy is dissipated due to friction), and the AMA is less than the IMA.

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3 years ago

Read 2 more answers

Where is information first stored in a human brain

Dmitrij [34]

Answer:

The long-term memories are stored throughout the brain as groups of neurons, the brain stores memories in three ways--Short-term memories, Sensory memory and Long-term memory the human brain cell can hold 5 times as much of information as the Encyclopedia Britannica.

Explanation:

I hope this helps, I got this from a website called Stack Exchange :)

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3 years ago

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A cyclist racing in the keiran is riding at the top of the track at 5m/s. Then he sprints downhill in the sprinting to the finis

kumpel [21]

The cyclist is moving by uniformly accelerated motion, with an initial velocity of $v_i=5~m/s$ and an acceleration of $a=9~m/s^2$ .
The acceleration is given by
$a= \frac{v_f-v_i}{\Delta t}$
where $v_f$ is the final velocity and $\Delta t$ is the time between the end and the beginning of the motion, and in our case it is 1.75 s. Therefore, from this relationship we can find the final velocity:
$v_f=v_i + a \Delta t=5~m/s+9~m/s^2 \cdot 1.75~s=20.75~m/s$

6 0

4 years ago

A woman lives on the eighth floor of an apartment building. She works in a high-rise office building 6.5 blocks away from her ap

san4es73 [151]

Answer:

b) d = 997.9 m , c) D = (952.9 i ^ +45 k ^) m , D = 953.6 m and θ = 2.7º

Explanation:

In this exercise we must add the distance traveled, remembering that the displacement is a vector and the distance a scalar.

a) The displacement scheme is the woman walks in her building A to descend to the lower floor 4.0 m, we assume that this includes the vertical displacement, until reaching the street level, the displacement is vertical in this part.

Being on the street, she travels the 6.5 blocks to reach the building where she works, they indicate that each block is 146.6 m, this movement is horizontal.

Upon reaching building B, she goes up to his office on the 14th floor where she travels 5.5m on each floor, it is assumed that the distance to go up to the upper floor is included, this displacement is vertical

b and c) Let's find the distance traveled and the displacement

in building A

Zₐ = 8 * 4.0

Zₐ = -32.0 m k ^

the vector k ^ indicates that the displacement is vertical and the negative sign that it is descending

on the street

$X_{ab}$ = 6.5 146.6

X_{ab} = 952.9 m i ^

the vector i ^ indicates that the displacement is the x-axis, we assume that the axis is in the direction of the displacement

in building B

$Z_{b}$ = 14 * 5.5

Z_{b} = 77 m k ^

displacement in the vertical axis and in the positive direction

now we calculate the distance traveled,

d = Zₐ + X_{ab} + Z_{b}

d = -32 + 952.9 + 77

d = 997.9 m

note that this value is a scalar

Let's calculate the displacement,

Z axis

$Z_{total}$ = Zₐ + Z_{b}

Z_{total} = -32 + 77

Z_{total} = 45 m k ^

X axis

X_{total} = X_{ab}

X_{total} = 952.9 m i ^

we can give the result in two ways

a) D = X_total i ^ + Z_total k ^

D = (952.9 i ^ +45 k ^) m

b) in module form and angles

Let's use the Pythagorean theorem

D² = $X_{total}^2$ + $Z_{total}^2$

D = √(952.9² + 45²)

D = 953.6 m

We use trigonometry

tan θ = Z / X

θ = tan⁻¹ (Z / X)

θ = tan⁻¹ (45 / 952.9)

θ = 2.7º

this angle is measured from the positive side of the x axis towards the z axis

6 0

3 years ago

A displacement vector with a magnitude of 20. meters could have perpendicular components with magnitudes of A. 10. m and 10. m B

mylen [45]

Answer:10.m and 10. M

Explanation:

6 0

3 years ago