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
gayaneshka [121]
1 year ago
11

In a typically constructed research study, the experimental group is selected:

Physics
1 answer:
blondinia [14]1 year ago
7 0

Answer:

D. from a separate pool than is the control group.

Explanation:

in the picture the person answers is backwards but...

hope this helps have a nice day

You might be interested in
An 8.0 cm object is 40.0 cm from a concave mirror that has a focal length of 10.0 cm. Its image is 16.0 cm in front of the mirro
svet-max [94.6K]
 We can rearrange the mirror equation before plugging our values in. 
1/p = 1/f - 1/q. 
1/p = 1/10cm - 1/40cm
1/p = 4/40cm - 1/40cm = 3/40cm
40cm=3p  <-- cross multiplication
13.33cm = p

Now that we have the value of p, we can plug it into the magnification equation.

M=-16/13.33=1.2
1.2=h'/8cm
9.6=h'

So the height of the image produced by the mirror is 9.6cm.
6 0
2 years ago
Hooke's law describes a certain light spring of unstretched length 33.6 cm. when one end is attached to the top of a doorframe a
masha68 [24]
Missing question: "What is the spring's constant?"

Solution:
The object of mass m=6.89 kg exerts a force on the spring equal to its weight:
F=mg=(6.89 kg)(9.81 m/s^2)=67.6 N
When the object is attached to the spring, the displacement of the spring with respect to its equilibrium position is
\Delta x=43.2 cm-33.6 cm=9.6 cm=0.096 m
And by using Hook's law, we can find the constant of the spring:
k= \frac{F}{\Delta x}= \frac{67.6 N}{0.096 m}=704.2 N/m
4 0
3 years ago
Describe the importance of SI units?​
anyanavicka [17]
SI unit is an international system of measurements that are used universally in technical and scientific research to avoid the confusion with the units. Having a standard unit system is important because it helps the entire world to understand the measurements in one set of unit system.
5 0
3 years ago
Read 2 more answers
Monochromatic light of a given wavelength is incident on a metal surface. However, no photoelectrons are emitted. If electrons a
mrs_skeptik [129]

Answer:

Light of a shorter wavelength should be used.

Explanation:

This is studied in the phenomenon called photoelectric effect, in which light is able to release electrons from a metal, said electrons are called photoelectrons .

The experiments that have been carried out show that <u>increasing  or decreasing the intensity of the light will not cause the photoelectrons to be emitted</u>, what will cause the photoelectrons to be emitted is to increase the frequency of the incident light.

And a higher frequency corresponds to a shorter wavelength according to the equation:

f=\frac{c}{\lambda}

(where f is frequency, c the speed of light, and \lambda the wavelength)

So the answer is that the wavelength of the light must be shortened to cause the emission of electrones.

4 0
3 years ago
The city council is considering discussing whether or not to put fluoride in the city's water supply. Many other towns add it al
umka2103 [35]
They should look for <span>a report from an independent scientific research firm,
even if they have to pay for it.

In preparing its report, the firm would have already surveyed many of the </span>
<span>citizens from several other towns that currently add fluoride to their water,
plus a lot of other relevant medical research on the subject.</span>
8 0
2 years ago
Read 2 more answers
Other questions:
  • Which statements are correct? Check all that apply. A. An insulator slows the flow of heat. B. A conductor increases the flow of
    5·2 answers
  • A 5 kg toy is tied to a rope where the tension measures 150 N. What is the weight of the object?
    11·1 answer
  • At what angle should an object be thrown so that the maximum range is equal to three times the height reached by the projectile?
    7·1 answer
  • A source emits sound uniformly in all directions. There are no reflections of the sound. At a distance of 12 m from the source,
    11·1 answer
  • Why do sugars molecules stay intact when dissolved by water?
    14·1 answer
  • When the mass of one object doubles what happens to its gravitational attraction to another object of constant mass, assuming th
    15·1 answer
  • Two 0.60-kilogram objects are connected by a thread that passes over a light, frictionless pulley. The objects are initially hel
    9·1 answer
  • Assignment
    8·1 answer
  • What is the velocity?
    7·1 answer
  • The idea that John Marshall, the first Chief Justice of the Supreme Court, singularly established the principle of judicial revi
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!