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kolbaska11 [484]
3 years ago
13

3. Mario is planning to conduct an experiment to determine which disinfectant is best for killing bacteria that are often found

in kitchens.
Which of the following would be the most logical dependent variable for his experiment?
A. type of disinfectant
B. source of bacteria
C. amount of disinfectant
D. number of bacteria that survived using the disinfectant
Physics
1 answer:
Sloan [31]3 years ago
7 0

Answer:

I would say D

Explanation:

The dependent variable is the thing that is measured when the independent variable is changed by us.

The independent variable would be the type of disinfectant so after you use the disinfectant you would measure the amount of bacteria meaning the answer would be D

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in which item is energy stored in the form of gravitational potential energy A)a slice of bread B)a compressed string C)an apple
olchik [2.2K]

For this case, in the next item we have gravitational potential energy:

An apple in a tree.

Suppose we define our reference system at the floor level.

Suppose the apple is at a height h from the floor and has mass m.

The gravitational potential energy of the apple is given by:

U = mgh

Where,

m: apple mass

h: height of the apple with respect to the floor

g: acceleration due to gravity

Answer:

C) an apple on a tree

7 0
4 years ago
Read 2 more answers
A 5 kg rock is raised 28 m above the ground level. What is the change in its potential energy?
marin [14]
Let's assume that ground level is the height 0 meters. The change in potential energy is going to be gravitational potential energy, which is given by PE=mgh.
ΔPE=mgh-mgy
=mg(h-y)
=50(28-0)
=1400 J
3 0
4 years ago
Which of the following has to happen before the eardrum begins to vibrate with the same frequency as the source of the sound wav
djverab [1.8K]

Answer:

C. The outer ear has to collect the sound waves and lead them to the middle ear.

Explanation:

In the process of hearing, the first thing that happens is that sound waves enter the outer ear through a passage called "auditory canal" that reaches the eardrum.

The movement of the incoming sound waves causes the eardrum to vibrate and transmit these vibrations to three tiny bones of the middle ear.

4 0
4 years ago
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A sled is initially given a shove up a frictionless 37.0 ∘ incline. It reaches a maximum vertical height 1.20 m higher than wher
labwork [276]

The initial speed of the sled at the given height is 4.85 m/s.

<h3>Initial speed of the sled</h3>

Apply the principle of conservation of energy;

K.E = P.E

¹/₂mv² = mgh

v² = 2gh

v = √2gh

where;

  • h is the vertical height reached
  • g is acceleration due to gravity

v = √(2 x 9.8 x 1.2)

v = 4.85 m/s

Thus, the initial speed of the sled at the given height is 4.85 m/s.

Learn more about initial speed here: brainly.com/question/24493758

#SPJ1

5 0
2 years ago
Two charged plates separated by 15 cm create a uniform electric field of 360 n/c. what is the potential difference between the p
nikitadnepr [17]

When two charged plates are separated by a distance, the potential difference between the plates is 54 Volts.

<h3>What is uniform electric field?</h3>

The electric field intensity which does not increase or decrease with time or remain constant is called the uniform electric field.

Given is the plates separated by distance d = 15 cm =0.15 m, electric field E= 360 N/C.

The relation between the electric field and voltage is

E=V/d

Substitute the values into the expression to get the potential difference V,

V = 360 x 0.15

V = 54 Volts

Thus, the potential difference between the plates is 54 Volts.

Learn more about uniform electric field.

brainly.com/question/26446532

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8 0
3 years ago
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