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polet [3.4K]
3 years ago
10

Megan wants to see if mice that are fed food A or B grow at a faster rate. She measures the mass of the mice on day 1, then divi

des them into two groups based on the type of food they will be given. She feeds each group the same amount of food at the same time each day. Does Megan have a control group in this experiment?
Physics
2 answers:
diamong [38]3 years ago
7 0
<span>No, there is no control group because each group is treated under test conditions.</span>
Nat2105 [25]3 years ago
4 0

Answer:

No

Explanation:

It is an example of experimental group. Experimental group is defined as the group in an experiment under which each variable is tested, however, one variable is tested at a time.

On the other hand, control group is defined as the group which does not receive treatment by the researchers.

The only difference between the both group is that, under experimental group independent variable is changed but under control group it is held constant.

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If an object falls and ends with a velocity of 58.8 m/s, how long was the<br><br> object falling?
tensa zangetsu [6.8K]

Answer:

the time taken for the object to fall is 6 s.

Explanation:

Given;

final velocity of the object, v = 58.8 m/s

initial velocity of the object, u = 0

The height of fall of the object is calculated as;

v² = u² + 2gh

v² = 2gh

h = \frac{v^2}{2g} \\\\h = \frac{(58.8)^2}{2(9.8)} \\\\h = 176.4 \ m

The time to fall through the height is calculated as;

h =ut+  \frac{1}{2} gt^2\\\\h = 0 +  \frac{1}{2} gt^2\\\\h =  \frac{1}{2} gt^2\\\\t= \sqrt{\frac{2h}{g} } \\\\t = \sqrt{\frac{2\times 176.4}{9.8} } \\\\t = 6 \ s

Therefore, the time taken for the object to fall is 6 s.

6 0
3 years ago
A positive point charge Q is fixed on a very large horizontal frictionless tabletop. A second positive point charge q is release
UNO [17]

Answer:

As it moves farther and farther away from Q, it's speed will keep increasing.

Explanation:

This is so because the point charges are both positive charges and positive charges repel.

As the charges repel, they do so at an increasing speed.

6 0
3 years ago
An eye is corrected by a -5.50 D lens, 2.0 cm from the eye. What is this eye's far point without glasses?
Paraphin [41]

Answer:

The relationship between diopter D and focal length f is D=1fD=1f So, f=−15.5=−0.182mf=−15.5=−0.182m

Explanation:

6 0
2 years ago
The current in a light bulb is 0.835A.How long does it take for a total charge of 1.67 C to pass a point in the wire
adelina 88 [10]

2s

Explanation:

Given parameters:

Current = 0.835A

Quantity of charge = 1.67C

Unknown:

Time taken = ?

Solution:

The quantity of electricity Q in coulombs is the product of the current I and time t.

   Q =  I x t

Q is the quantity of electricity in coulombs

 I is the current

 t is the time taken

   input the values and solve for t;

   1.67 = 0.835 x t

t = \frac{1.67}{0.835}    =   2s

learn more:

Current brainly.com/question/4438943

#learnwithBrainly

5 0
3 years ago
A pipe open at both ends resonates at a fundamental frequency fopen. When one end is covered and the pipe is again made to reson
xz_007 [3.2K]

Answer:

option (1)

Explanation:

fundamental frequency of open pipe, fopen = v/2L

fundamental frequency of closed pipe, f closed = v / 4L

By dividing both of them

f open = 2 x f closed

f open = two times f closed

f closed = 1 / 2 x f open

8 0
3 years ago
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