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3 years ago

13

Important changes in the musculoskeletal system due to physical activity seem to begin at _______ minutes of activity a week. A.

30 B. 60 C. 80 D. 90

1 answer:

baherus [9]3 years ago

5 0

I think the answer is a

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A rubbit gets down from a rump which its /\x=0.85m in 0.5s, The rubbit's mass is 2kg, what is the net Force?

Ira Lisetskai [31]

Answer: 13.6 N

Explanation:

The equation of motion for the rabbit is:

$\Delta x=V_{ox}t+\frac{1}{2}a_{x}t^{2}$ (1)

Where:

$\Delta x=0.85 m$ is the distance traveled by the rabbit

$V_{ox}=0 m/s$ is the rabbit's initial velocity, assuming it started from rest

$t=0.5 s$ is the time

$a_{x}$ is the acceleration

Isolating $a_{x}$ :

$a_{x}=\frac{2 \Delta x}{t^{2}}$ (2)

$a_{x}=\frac{2 (0.85 m)}{(0.5)^{2}}$ (3)

$a_{x}=6.8 m/s^{2}$ (4)

On the other hand, the force $F_{x}$ is given by:

$F_{x}=m.a_{x}$ (5)

Where $m=2 kg$ is the mass of the rabbit

Substituting (4) in (5):

$F_{x}=(2 kg)(6.8 m/s^{2})$ (6)

Finally:

$F_{x}=13.6 N$

6 0

3 years ago

Lin suffers from pain in her right wrist. Several doctors check her wrist regularly over a period of time. Doctors' notes and

FromTheMoon [43]

Answer:

D

Explanation:

They looked at her hand and made a formal conclusion from that

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3 years ago

Dx= 7.14m and Dy = -7.55m<br> What is the direction and magnitude of the vector

KengaRu [80]

The Magnitude of the Vector is 10.39m and the direction of the vector is - 46.7°.

<u>Explanation:</u>

GIven dx=7.14m and dy= -7.55m,

The Magnitude of the Vector= $\sqrt{dy^{2} +dx^{2} }$

Magnitude d= $\sqrt{(7.14)^{2} +(-7.55)^{2} }$ .

d= $\sqrt{50.97+57}$

d= $\sqrt{107.98}$

d= 10.39m.

Direction Ф = $tan^{-1}$ $\frac{dy}{dx}$

= $tan^{-1}$ $\frac{-7.55}{7.14}$

= $tan^{-1}$ (-1.06)

Ф = - 46.7°.

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2 years ago

How can a large construction project impact water quality, supply or flow?

Korolek [52]

Answer:

Construction also impacts the community’s water quality. During the construction phase, pollutants can end up in the water supply. Once construction is over, the water quality can still be a problem due to an increased demand for water, as well as increased pollution due to additional residents.

Explanation:

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3 years ago

The tubes that go from the trachea into the lungs

exis [7]

The answer is bronchi

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3 years ago