All categories

4 years ago

When designing an experiment, why is it important to test only one variable?

Physics

2 answers:

m_a_m_a [10]4 years ago

6 0

That's the only way you can get consistent and accurate results.

zheka24 [161]4 years ago

6 0

I will try to explain more in depth. Lets say Jimmy frequently has headaches and needs medicine to treat it. Jimmy uses Headfix and Achefix both in one experiment. The next day, Jimmy feels great. His headaches are cured, but since Jimmy used 2 variables (the 2 medicines), he is left with three options

a. Headfix worked
b. Achefix worked
c. Both worked.

Now Jimmy has no idea what solved his problem. It could be 3 possible answers. However, if he used one variable at a time and had two experiments instead, lets see what happens.

Jimmy uses Headfix.
a. It worked
b. It didn't work

Headfix did not work.

Next experiment Jimmy uses Achefix
a. It worked
b. It didn't work

Achefix worked.

Now instead of having three possible solutions, you have 1 definite answer experiment. Therefore you cannot use more than one variable because there could be multiple outcomes and you do not know which variable affected the results differently/

You might be interested in

Which two statements about redox reactions are true? HELP ASAP!!!!

AlekseyPX

The answer is D
Explanation:

8 0

3 years ago

The tape in a videotape cassette has a total

Softa [21]

Answer:

1.37 rad/s

Explanation:

Given:

Total length of the tape is, $d= 297$ m

Total time of run is, $t = 2.1$ hours

We know, 1 hour = 3600 s

So, 2.1 hours = 2.1 × 3600 = 7560 s

So, total time of run is, $t= 7560$ s

Inner radius is, $r = 10\ mm = 0.01\ m
$

Outer radius is, $R = 47\ mm = 0.047\ m
$

Now, linear speed of the tape is, $v =\frac{d}{t}=\frac{297}{7560}=0.039\ m/s
$

Let the same angular speed be $\omega$ .

Now, average radius of the reel is given as the sum of the two radii divided by 2.

So, average radius is, $R_{avg}=\frac{R+r}{2}=\frac{0.047+0.01}{2}=\frac{0.057}{2}=0.0285\ m
$

Now, common angular speed is given as the ratio of linear speed and average radius of the tape. So,

$\omega=\dfrac{v}{R_{avg}}\\\\\\\omega=\dfrac{0.039}{0.0285}\\\\\\\omega=1.37\ rad/s
$

Therefore, the common angular speed of the reels is 1.37 rad/s.

5 0

4 years ago

Technician a says that shims are sometimes used to adjust camber. technician b says that shims can sometimes be used to adjust c

meriva

I'll have to be honest with you. I've read both of those opinions several times, carefully, and it looks to me like both technicians are saying exactly the same thing.

Now, my knowledge of shims and camber is limited (to approximately zero), so all I can say to answer the question is this: If EITHER technician is correct, then they're BOTH correct.

8 0

4 years ago

What is the force of gravity on a dog in a space suit that's running around on the moon? The dog's body has a mass of 20 kilogra

gulaghasi [49]

Answer:

32.4 N

Explanation:

The force of gravity acting on the dog is equal to its weight on the Moon, which is given by

$W=mg$

where:

m is the mass of the dog

g is the acceleration of gravity on the moon

In this problem, we have:

m = 20 kg

g = 1.62 m/s^2 (acceleration due to gravity on the moon)

Substituting numbers into the equation, we find

$W=(20 kg)(1.62 m/s^2)=32.4 N$

4 0

3 years ago

Read 2 more answers

What the velocity from the graph given above?

igomit [66]

Answer:

i think its 4 or 35

Explanation:

its in the middle of 40 and 30

5 0

4 years ago