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VashaNatasha [74]
3 years ago
8

​dr. webb designs a research study in which neither the subjects nor the individuals who interact directly with the subjects kno

w which is the control group and which is the experimental group in the study. dr. webb probably chose this type of research design in order to
Social Studies
2 answers:
Vadim26 [7]3 years ago
6 0
<span>less the effect of experimenter bias
   The eyewitness hope impact (likewise called the experimenter-anticipation impact, experimental bias , onlooker impact, or experimenter impact) is a type of reactivity in which a specialist's subjective predisposition makes them intuitively impact the members of a test.</span>
Nikolay [14]3 years ago
4 0

Dr. Webb designs a research study in which neither the subjects nor the individuals who interact directly with the subjects know which is the control group and which is the experimental group in the study. Dr. Webb probably chose this type of research design in order to less the effect of experimenter bias.

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How fast must an object move before its length appears to be contracted to one-half its proper length?
notsponge [240]

The object must move with the speed of \frac{\sqrt{3} }2} times to approximately seeing that it is contracted to exactly half of its actual length.

<h3>How is this calculated?</h3>

The length contraction experimented by the object as it approaches lightspeed, in meters per second, is described by Lorentz contraction formula:

\frac{L}{L'} = \sqrt{(1) - (\frac{v}{c})^{2}

Here, v is the current speed m/s

c is the speed of light in m/s

L' is the length of the object at rest in m

L is the length of the object at the current speed in m

Now we know that

\frac{L}{L'}= \frac{1}{2} and \frac{v}{c} = r then,

\frac{1}{2} = \sqrt{1 - r^{2} }\\\frac{1}{4} = 1 - r^{2}\\r^{2} = \frac{3}{4}

Hence, r = \frac{\sqrt{3} }{2}

Therefore, the answer is the object must travel at a speed of \frac{\sqrt{3} }{2} times the lightspeed to be contracted to one-half its proper length.

To know more about the Lorentz contraction formula, visit:

brainly.com/question/17407131

#SPJ4

7 0
2 years ago
How did the purchase of Alaska increase American commercial interests?
Vaselesa [24]

Answer: In Alaska, the Americans foresaw a potential for gold, fur and fisheries, as well as more trade with China and Japan. Mar 29, 2017

Explanation:

5 0
2 years ago
Chanel has recently finished high school and is now attending college. After earning her undergraduate degree she plans to conti
Pachacha [2.7K]

Answer:

The answer is emerging adulthood.

Explanation:

This stage encompasses late adolescence and early adulthood. The term is often used to describe people in their twenties, attending college and with no children.

Some researches, such as Jeffrey Arnett, suggest that people during this stage struggle with identity issues, do a variety of activities and are not constrained by specific social roles.  

8 0
3 years ago
Jesus had a total of twelve disciples, true or false?
ankoles [38]
True . Check google or read the bible
6 0
3 years ago
What was mohenjo daro
tino4ka555 [31]
 Mohenjo-daro (from the Sindhi language: Mount of the dead) is an archaeological site in today's Pakistan. 

The culture that created it is the Indus Valley Civilisation, which founded a settlement on the site around 2500 BCE. 

Currently the site is threatened and is in a dire need for restoration or it might be completely destroyed soon. 
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3 years ago
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