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3 years ago

HELP PLEASE! Need ASAP!!! Will mark brainiest

Physics

2 answers:

11111nata11111 [884]3 years ago

8 0

Answer:

1: D- attach the muscle to bones and allow for movement

2:A- skeletal

3. A- speaking

Explanation:

Mama L [17]3 years ago

6 0

Answer:

1:b 2:a 3: is either a or b

Explanation:

Havent done this in a long time but 1 and 2 is correct

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Solve problem which attached

timofeeve [1]

The file is blank!

*Explanation:* maybe add another?

7 0

3 years ago

12. Suppose a person uses a mechanical iack to lift half the weight of a car with a

Likurg_2 [28]

a) The force that must be applied is 73.5 N

b) The actual efficiency is 82 %

Explanation:

Since the jack is 100% efficient, all the input work is converted into output work. So we can write:

$W_{in} = W_{out}\\F_{in} d_{in} = F_{out} d_{out}$

where:

$F_{in}$ is the input force applied on the jack

$d_{in}$ is the arm of the input force

$F_{out}$ is the output force applied on the jack

$d_{out}$ is the arm of the output force

Here we have:

$F_{out}=\frac{mg}{2}= \frac{(1200 kg)(9.8 m/s^2)}{2}=5880 N$ is the output force (half the weight of the car)

$d_{in} = 40.0 cm = 0.40 m$ is the arm of the input force

$d_{out} = 5.0 mm = 0.005 m$ is the arm of the output force

Solving for $F_{in}$ , we find the force that must be applied in input to lift the car:

$F_{in} = \frac{F_{out}d_{out}}{d_{in}}=\frac{(5880)(0.005)}{0.40}=73.5 N$

The efficiency of the jack is given by the ratio between the output work and the input work:

$\eta = \frac{W_{out}}{W_{in}}=\frac{F_{out}d_{out}}{F_{in}d_{in}}$

where we have:

$F_{out}=5880 N$ is the output force (half the weight of the car)

$d_{in} = 40.0 cm = 0.40 m$ is the arm of the input force

$d_{out} = 5.0 mm = 0.005 m$ is the arm of the output force

Here we are told that the input force this time is

$F_{in}=90.0N$

Substituting into the equation, we find the new efficiency of the jack:

$\eta = \frac{(5880)(0.005)}{(90.0)(0.40)}=0.82$

Which means an efficiency of 82%.

Learn more about levers:

brainly.com/question/5352966

#LearnwithBrainly

8 0

4 years ago

Consider vectors u and v, where u = ⟨1, –1⟩ and v = ⟨1, 1⟩. what is the measure of the angle between the vectors?

padilas [110]

The angle between the two vectors is 0⁰, thus the two vectors are parallel to each other.

<h3>Angle between the vectors</h3>

The angle between the vectors describes the direction of the vector and the value of the angle can be determined from the horizontal and vertical components of the vectors as shown below.

The sum of the horizontal components and vertical components of the vectors is calculated as follows;

Sum of the horizontal component of the vectors, x = 1 + 1 = 2

Sum of the vertical component of the vectors, y = -1 + 1 = 0

The angle between the vectors is calculated as follows;

θ = arc tan (y/x)

θ = arc tan (0/2)

θ = arc tan (0)

θ = 0⁰

The angle between the two vectors is 0⁰, thus the two vectors are parallel to each other.

Learn more about vectors here: brainly.com/question/25811261

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8 0

2 years ago

Lowest form of energy from the sun

Ugo [173]

UVA

I'm pretty sure it's UVA :)

8 0

3 years ago

Which of the following is true regarding transverse waves?

DIA [1.3K]

Answer:

in a transverse wave, The directions that energy and matter travel in are perpendicular to one another.

these waves are types of mechanical waves that doesn't require any material medium to transfer.

4 0

3 years ago