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3 years ago

For a study to accurately reflect a target population behavior, it must use __________ measures.

Physics

2 answers:

kari74 [83]3 years ago

4 0

Answer: a. both reliable and valid

The parameters used to describe a particular trait or characteristic in a human behavior should be reliable and valid, in order to determine the response of the population with respect to a particular stimulus.

ArbitrLikvidat [17]3 years ago

3 0

Answer:

A on edge

Explanation:

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A boy in a wheelchair (total mass 54.5 kg) has speed 1.40 m/s at the crest of a slope 2.10 m high and 12.4 m long. At the bottom

babymother [125]

Answer:

630.75 j

Explanation:

from the question we have the following

total mass (m) = 54.5 kg

initial speed (Vi) = 1.4 m/s

final speed (Vf) = 6.6 m/s

frictional force (FF) = 41 N

height of slope (h) = 2.1 m

length of slope (d) = 12.4 m

acceleration due to gravity (g) = 9.8 m/s^2

work done (wd) = ?

we can calculate the work done by the boy in pushing the chair using the law of law of conservation of energy

wd + mgh = (0.5 mVf^2) - (0.5 mVi^2) + (FF x d)

wd = (0.5 mVf^2) - (0.5 mVi^2) + (FF x d) - (mgh)

where wd = work done

m = mass

h = height

g = acceleration due to gravity

FF = frictional force

d = distance

Vf and Vi = final and initial velocity

wd = (0.5 x 54.5 x 6.9^2) - (0.5 x 54.5 x 1.4^2) + (41 x 12.4) - (54.5 X 9.8 X 2.1)

wd = 630.75 j

3 0

3 years ago

A crate is being pulled down an incline as shown in the figure. With respect to the crate's direction of motion, which of the fo

Dmitrij [34]

Answer: Fn

Explanation: Because Fn is applying force upward

7 0

3 years ago

A circuit is constructed with six resistors and two batteries as shown. the battery voltages are v1 = 18 v and v2 = 12 v. the po

VladimirAG [237]

Answer:

V4=9.197v

Explanation:

Given:

V1= 18v ,V2= 12v ,r1=r5=58ohms ,r2=r6=124ohms , r3=47ohms ,r4= 125ohms

V4= I4R4 = V2/(R4 + R5)×R4

V4= 12×125 /(125 + 58)

V4=1500/183 =9.197v

5 0

3 years ago

Which lists imaging techniques that use wave behaviors in order of increased risk of cancer from least risk to greatest

Cerrena [4.2K]

Imaging techniques that use wave behaviors are -

sonography
X-ray radiography
CT scan

<h3>How can mechanical waves help in the treatment of cancer?</h3>

Ultrasound is used to improve absorption of a radioactive pellet by a tumor. The radioisotope in a radiopharmaceutical releases sound waves into surrounding cells. Beams of X-rays are targeted at a cancerous tumor from outside the body.

<h3>How can mechanical waves help the treatment of cancer?</h3>

HIFU is a cancer treatment that uses high-frequency sound waves. You have HIFU from a machine. The machine gives off the sound waves which deliver a strong beam to a specific part of a cancer. This heats and destroys the cancer cells.

HIFU can treat a single tumour or part of a large tumour. But it is not suitable for people with cancer that has spread to more than one place in their body.

To learn more about cancer from the given link

brainly.com/question/11710623

#SPJ4

7 0

2 years ago

I dont understand how to find the blanks

Amiraneli [1.4K]

The forces are:

$F_{grav} = 98,000 N$ , down

$F_{net} = 80,000 N$ , down

$F_{air}=18,000 N$ , up

Explanation:

We start by finding the force of gravity on the elephant, $F_{grav}$ , which is given by

$F_{grav}=mg$ (downward)

where

m = 10,000 kg is the mass of the elephant

$g=9.8 m/s^2$ is the acceleration of gravity

Substituting,

$F_{grav}=(10,000)(9.8)=98,000 N$

Now we know that the net acceleration of the elephant is

$a_{net}=8.0 m/s^2$ downward

We can now use Newton's second law:

$F_{net}=ma_{net}$

where $F_{net}$ is the net force on the elephant. Substituting, we find

$F_{net}=(10,000)(8.0)=80,000 N$

and it also acts downward, since it has the same direction as the acceleration.

Finally, we can write the net force on the elephant as

$F_{net}=F_{grav}-F_{air}$

where the force of gravity acts downward, while the air resistance ( $F_{air}$ acts upward. The net force also acts downward, so it has the same sign of gravity.

Substituting:

$F_{net}=80,000 N\\F_{grav}=98,000 N$

And solving, we find the air resistance:

$F_{air}=F_{grav}-F_{net}=98,000-80,000 = 18,000 N$ (upward)

Learn more about forces and Newton laws of motion:

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#LearnwithBrainly

4 0

4 years ago