1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Zepler [3.9K]
4 years ago
11

Describe two methods a researcher can use to avoid obtaining a nonrepresentative sample

Physics
1 answer:
exis [7]4 years ago
3 0

Answer:

sorry i cant understand ur questions okk g

You might be interested in
Net force = ?
Snezhnost [94]

Answer:

A. the total net force is 14

B. the total net force is 15

Explanation:

7 0
4 years ago
A balloon and a mass are attached to a rod that is pivoted at P.
Brrunno [24]

Answer:

The correct option is;

B Move both the balloon and mass 10 cm to the right

Explanation:

Given that the system is in equilibrium, we have;

Force of balloon = F_b↑

Force of mass = F_m ↓

The direction of the balloon is having an upward motion which gives a clockwise moment or motion to the rod while the direction of the force of the mass weight is downwards, giving the rod an anticlockwise moment

for the rod to rotate clockwise, the moment of the balloon should be larger than that of the rod

At the present equilibrium we have;

F_b × 30 =  F_m × 20

Therefore;

F_m = 1.5×F_b

Moving both balloon and mass 10 cm to the right gives;

The moment of the balloon = F_b × (30 - 10)  = F_b × 20 = 20×F_b,

The moment of the mass =  F_m × (20 - 10) =  F_m × 10

When we substitute  F_m = 1.5×F_b in the moment equation for the mass, we have;

The moment of the mass = F_m × 10 = 1.5×F_b ×10 = 15×F_b

Therefore, the balloon now has a larger momentum than that of the mass and the rod will rotate clockwise.

4 0
3 years ago
Whats this symbol?<br> ∑
olga2289 [7]
That is the Sigma Symbol. It’s the addition of a sequence of numbers; the result is the sum of the total. if numbers are added sequentially from left to right, any intermediate result is a partial sum, prefix sum, or running total of the summation
4 0
3 years ago
A package is dropped from a hovering helicopter.
aivan3 [116]

Answer:

The height of the package when it was released was 1102.5 meters

Explanation:

A package is dropped from a hovering helicopter

Dropped means the initial velocity of the package is zero

The package takes 15 seconds to strike the ground

Ignore the air resistance

We need to know the height of the package when it was released

h=ut+\frac{1}{2}gt^{2}, where h is the height of the package

from the ground, u is the initial velocity, g is the acceleration of gravity

and t is the time

u = 0 , t = 15 seconds , g = 9.8 m/s²

h=(0)(15)+\frac{1}{2}(9.8)(15)^{2}

h=0+1102.5

h = 1102.5 meters

<em>The height of the package when it was released was 1102.5 meters</em>

4 0
3 years ago
A bus start from rest and then moves with a constant acceleration of 2m/s square. calculate its time of traven if its final velo
pshichka [43]

Answer:

Its Answer is 10 s.

Explanation:

As acceleration is defined as time rate of change of velocity. So,

a =  ( vf - vi ) ÷ t

2 = (20 - 0 ) ÷ t

2 =  20 ÷  t

t = 20 ÷ 2

t  = 10 s

We have put initial velocity as zero because  body is starting from rest.

<em>Hope it helps.</em>

5 0
3 years ago
Other questions:
  • A 1200-kilogram space vehicle travels at 4.8 meters per second along the level surface of Mars. If the magnitude of the gravitat
    8·2 answers
  • The bio-mechanical terms
    14·1 answer
  • Someone please help with the picture up top??
    10·1 answer
  • A body moving with constant acceleration covers the distance between two points 60.0 m apart in 6.0 seconds. Its velocity as it
    8·1 answer
  • How long does it take electrons to get from a car battery to the starting motor? Assume the current is 280 A and the electrons t
    12·2 answers
  • Define nuclear forces
    14·2 answers
  • There is a girl pushing on a large stone sphere. The sphere has a mass of 8200 kgand a radius of 90 cm and floats with nearly ze
    10·1 answer
  • The interstitial endocrine cells that produce testosterone are located ________. A) in the rete testis B) between the seminifero
    8·1 answer
  • A ball is dropped from the top of a building. It initially
    13·1 answer
  • What are the available motor sizes for 2023 ariya ac synchronous drive motor systems in kw?.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!