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tankabanditka [31]
3 years ago
6

Which term refers to a group or community that forms the focal point of study and consists of all the people considered for eval

uation in the research?
sample
population
variable
mean
Physics
2 answers:
DIA [1.3K]3 years ago
5 0
It is the variable that is the answer
Pie3 years ago
3 0

The correct answer is option A, Sample

A sample population is a small part of the entire population and it also represents the entire population. In a random sample population, all individual have an equal opportunity of being selected while a featured sample represents the group of individual with specific trait or characteristics. For example , if a study is to be conducted to measure the weight of old age women in society A, then the focus group will include all old aged women and weight of each women in this sample will be included in the research analysis.  

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An ambulance is driving towards the hospital at a velocity 108 km/h and emitting a steady 798-Hz sound from its siren. The sound
slava [35]

To solve this problem we will apply the concepts related to the Doppler effect. The Doppler effect is a physical phenomenon where an apparent change in wave frequency is presented by a sound source with respect to its observer when that same source is in motion. Mathematically it can be described as

f_d= f_s \frac{(v+v_d)}{(v-v_s)}

The meaning of each of these variables is,

v_d=Velocity of detector

f_s=Frequency of wave emitted by source

v_s=Velocity of source

v=Velocity of sound wave

f_d=Frequency received by detector

Replacing we have that,

f_d = 798(\frac{(343+30)}{(343-30)})

f_d=950 Hz

Therefore the correct option is e. 950Hz

5 0
3 years ago
At least how many objects with charged particles must exist for there to be an electric force?
dimulka [17.4K]

Answer:

derecha, izquierda, derecha, arriba

Explanation:

6 0
3 years ago
Read 2 more answers
A person absentmindedly walks off the edge of a tall cliff. They will fall 50 m into either
kifflom [539]

The man can survive, and he lands 12.1 m from the base of the cliff (into the lake)

Explanation:

The motion of the person is equivalent to the motion of a projectile, which consists of two separate motions:

- A uniform motion (constant velocity) along the horizontal direction

- An accelerated motion with constant acceleration (acceleration of gravity) in the vertical direction

We start by analyzing the vertical motion, to find the time it take for the person to reach the ground level. We can use the following suvat equation:

s=ut+\frac{1}{2}gt^2

where

s = 50 m is the vertical distance covered (the height of the cliff)

u = 0 is the initial vertical velocity

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

t is the time of flight

Solving for t,

t=\sqrt{\frac{2s}{g}}=\sqrt{\frac{2(50)}{9.8}}=3.19 s

The person moved horizontally at a constant speed of

v_x = 3.8 m/s

So, the horizontal distance covered by the man during his flight will be

d_x = v_x t = (3.8)(3.19)=12.1 m

So, the man will land on the lake (which starts from 12 m), so he can survive.

Learn more about projectile motion:

brainly.com/question/8751410

#LearnwithBrainly

8 0
3 years ago
Now assume that Eq. 6-14 gives the magnitude of the air drag force on the typical 20 kg stone, which presents to the wind a vert
chubhunter [2.5K]

Answer:

362.41 km/h

Explanation:

F = Force

m = Mass = 84 kg

g = Acceleration due to gravity = 9.81 m/s²

C = Drag coefficient = 0.8

ρ = Density of air = 1.21 kg/m³

A = Surface area = 0.04 m²

v = Terminal velocity

F = ma

F=\frac{1}{2}\rho CAv^2\\\Rightarrow mg=\frac{1}{2}\rho CAv^2\\\Rightarrow v=\sqrt{2\frac{mg}{\rho CA}}\\\Rightarrow v=\sqrt{2\frac{20\times 9.81}{1.21\times 0.8\times 0.04}}\\\Rightarrow v=100.66924\ m/s

Converting to km/h

100.66924\times 3.6=362.41\ km/h

The terminal velocity of the stone is 362.41 km/h

5 0
3 years ago
Read 2 more answers
ANSWER AND I WILL BUY A CAR
Natali [406]
You are exerting 100N. Since there’s no NET force, then there must be exactly 100N pushing exactly back on your 100N to cancel it to exactly zero. Newton's first law states that whether a body is at rest or travelling in a straight line at a constant speed, it will remain at rest or continue to move in a straight line at a constant speed unless acted upon by a force.
8 0
3 years ago
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