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-BARSIC- [3]
3 years ago
12

How do bones and muscles work together to allow movement?

Physics
2 answers:
Ganezh [65]3 years ago
8 0
The answer is definitely A <span />
alexandr1967 [171]3 years ago
7 0
I believe the answer is A

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Devon is riding his bicycle at 15 m/s. How far will he travel in 12 s?
Gre4nikov [31]
Devon will travel 180m in 12 seconds. All you have to do is multiply 15 by 12. Hope this helps
6 0
2 years ago
A fish finder uses a sonar device that sends 20,000-Hz sound pulses downward from the bottom of the boat, and then detects echoe
mrs_skeptik [129]

Answer:  The minimum time between pulses (in fresh water)

= 0.3106 s

Explanation:

To calculate the speed of echoes sounds, we will use

Speed = 2x/t

Where x = distance and t = total time.

Please note that:

sound travels at 343 m/s in air. But it travels at 1,481 m/s in water (almost 4.3 times as fast as in air); 

Total distance = 2 × 230 = 460m

Using speed of sound in water

1481 = 460/t

t = 460/1481

t = 0.3106

3 0
3 years ago
In loading a lorry, a man lifts boxes each of weight 100N through a height of 1.5m.
liq [111]

Answer:

The amount of work done in order to lift the box is 150\ Joule

Explanation:

Given the weight of each box is 100N

And the man lifts boxes at a height of 1.5m

We need to find the amount of work done.

The amount of work done is the product of applied force F that causes the displacement d.

In our problem force is 100N and displacement is  1.5m.

Now, work done

=force\times displacement\\=100\times1.5\\=150\ Joule

So, the amount of work done in order to lift the box is 150\ Joule

5 0
3 years ago
An object is dropped from a​ tower, 400 ft above the ground. The​ object's height above ground t seconds after the fall is ​s(t)
Paul [167]

Answer: v= 160ft/s

a=32ft/s^2 constant

Explanation:

s(t)=400-16t^2 derivative of position is velocity v(t) and derivative of velocity is acceleration a(t) so let s(t)=0 to find the time of flight to reach the ground and take the two derivatives and use the time found and solve. Also acceleration is a constant as it’s gravity.

0=400-16t^2

400=16t^2

25=t^2

t=5s

ds/dt=v(t)=0-32t

dv/dt=a(t)=-32 constant(gravity)

v(t)=-32(5s)= -160ft/s negative sign is only showing direction

7 0
3 years ago
Determine the magnitude of the force F1F1 component acting along the uu axis. Express your answer to three significant figures a
dybincka [34]

The first image below shows force F1 and the axes.

Answer: (F_{1})_{u}= 3.62 kN

Explanation: The second figure below express the parallelogram method to calculate the u component of force F1.

The <u>Parallelogram</u> <u>Method</u> is a method to determine resultant force and is applied as described in the question above.

With the three components, F_{1},(F_{1})_{u} and (F_{1})_{v} and angles, it can be used the <u>Law</u> <u>of</u> <u>Sines</u>, which states:

\frac{a}{sin\alpha} =\frac{b}{sin\beta} =\frac{c}{sin\theta}

i.e., there is a relation of proportionality between an angle and its opposite side.

For the triangle below:

\frac{u}{sin30} =\frac{F_{1}}{sin105}

u=F_{1}\frac{sin(30)}{sin(105)}

u=7\frac{0.5}{0.966}

u = 3.62

The magnitude of the component acting along the u-axis is 3.62kN.

5 0
3 years ago
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