The makers of brand A hand sanitizer want to prove that their sanitizer kills more bacteria than the other 4 leading brands of sanitizer. They organize 60 test subjects into 6 groups of 10 test subjects. The test subjects participate everyday for one week, the data for the experiment is shown below where the final average number of bacteria still remaining is given.
Table 1. Effectiveness of Hand Sanitizer on Bacteria
[See Attached]
Please develop a CONCLUSION for this experiment.
Answers
Based on the results of the experiment, it can be concluded that the claim by Brand A that their sanitizer kills more bacteria than the other 4 leading brands of sanitizer is true.
What is an experiment?An experiment is a procedure carried out to support or refute a hypothesis, or determine the efficacy or likelihood of something previously untried.
The experiment is the foundation of the scientific method, which is a systematic means of exploring the world around us.
Experiments takes place in laboratories, but can also be performed anywhere at any time.
There are some steps in the scientific methods which includes:
Make observations.Formulate a hypothesis.Design and conduct an experiment to test the hypothesis.Evaluate the results of the experiment.Accept or reject the hypothesis.If necessary, make and test a new hypothesis.Considering the data table from the experiment:
The results of this study concur with brand A goals as hand sanitizers producers as product effectiveness has improved over time. The performance of brands A has indicated improved effectiveness as their claims has been found true with respect to other manufacturers of the sanitizer. This study showed that brand A hand sanitizers were tested and found more effective against selected brands.
In conclusion, the results of the experiments showed that in the comparison between the brands of hand sanitizers, brand A were most effective.
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Related Questions
A baseball is popped straight up with an initial speed of 25.9 meters per second. What is the ball's velocity after it has traveled a total distance of 50.0 meters? Include units in your answer.
Answers
The ball's velocity after it has travelled a total distance of 50.0 meters is 40.63 m/s
Data obtained from the questionThe following data were obtained from the question:
Initial velocity (u) = 25.9 m/sAcceleration due to gravity (g) = 9.8 m/s²Height (h) = 50 mFinal velocity (v) = ?How to determine the final velocityWe can obtain the final velocity as illustrated below:
v² = u² + 2gh
v² = 25.9² + (2 × 9.8 × 50)
v² = 670.81 + 980
v² = 1650.81
Take the square root of both sides
v = √1650.81
v = 40.63 m/s
Thus, the velocity after travelling 50 m is 40.63 m/s
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Which is true about mass and weight?
Mass depends on location, weight is the same everywhere.
Mass and weight are the same thing.
Objects dropped in a vacuum (no air) will fall at different rates because they have different weights.
Mass is measured with a spring scale.
Mass must be in kg and weight in N to do our calculations.
Answers
The statement that is true about mass and weight is as follows: Mass must be in kg and weight in N to do our calculations (option E).
What is mass and weight?Mass is the quantity of matter which a body contains, irrespective of its bulk or volume. The mass of a substance is measured in kilograms.
On the other hand, weight is the force on an object due to the gravitational attraction between it and the Earth. It is measured in Newtons.
The mass of an object is the same everywhere, however, it's weight is dependent on location. For example, the weight of an apple on Earth will differ from it's weight in Mars.
Therefore, the statement that is true about mass and weight is as follows: Mass must be in kg and weight in N to do our calculations.
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True or False—The vector for a negative acceleration points in the opposite direction when compared to the vector for a positive acceleration.
Answers
Answer:
True
Explanation:
Opposites point in opposite directions
Determine the value of x. A 9.75 B 11 C 22 D 19.5
Answers
A. The value of x in the given circular geometry is determined as 9.75.
Value of x in the geometry
The value of x can be calculated by applying the following rules of geometry as shown below.
angle AC = angle at the center
angle at center = twice angle at circumference
147 = 2(6x + 15)
147 = 12x + 30
147 - 30 = 12x
117 = 12x
x = 117/12
x = 9.75
Thus, the value of x in the given circular geometry is determined as 9.75.
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Which of the following branches studies the particles moving at any speed,
including very high speeds.
A. Optics
B. Thermodynamics
C. Astrophysics and Cosmology
D. Relativity
Answers
The correct answer is option D. That is, the branch of Physics that study the particles movement at any speed, including very high speeds is Relativity
Difference between Kinematic and Dynamics
Kinematic is a branch of Physics that deal with a study of particle's motion without considering the cause of the motion. While dynamics deals with the motion of a particle as well as the causes of the motion.
The branch of Physics that study the particles movement at any speed,
including very high speeds is Relativity.
We have relativity of mass, relativity of time and relativity of length. All deal with the speed of light which is the fastest speed on earth as of now.
Therefore, the correct answer is option D. That is, the branch of Physics that study the particles movement at any speed, including very high speeds is Relativity.
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What would decrease the gravitational pull between the sun and Earth?(1 point)
Responses
a. if the sun was twice its size
if the sun was twice its size
b.
if Earth was twice its size
if Earth was twice its size
c. if Earth was closer to the sun
if Earth was closer to the sun
d. if the sun was farther away from Earth
if the sun was farther away from Earth
Answers
The gravitational pull between the sun and Earth decreases if the sun was farther away from the earth.
What is Gravitational Force?Any two bodies' gravitational pull on one another is directly proportional to the product of their masses and inversely proportional to the square of their distance from one another.
How do the planets move in relation to the Sun? The planets' orbits around the Sun are maintained by the gravity of the Sun. The Moon orbits the Earth due to the Earth's gravitational pull on the Moon for the same reason. But if the Earth is being drawn to the Sun, why doesn't it fall into it or the Moon strike the Earth?
The cause of this is because Earth moves at a speed that is perpendicular to the Sun's gravitational pull. The planets are thus kept in their designated orbits by the Sun's attraction as well as their sideways motion. Similar to how the Earth orbits the Moon, the Moon does so without touching it.
F=G(M1M2)/R² where,
F denotes gravitational force between two bodies,
R is the distance between two bodies from their center,
M1 denotes mass of first body and,
M2 denotes mass of second body.
So according to the question, if the distance between two bodies will increase, then the gravitational force between them will also decrease.
Hence, if the sun was farther away from earth, then gravitational pull between the sun and earth will decrease.
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If you square the momentum expressed in kilogram-meters per second, in what units will the answer be expressed? (Use the following as necessary: kg, m, and S.)
Answers
When you square the unit of momentum, the new unit will be expressed as kg²m²/s².
What is linear momentum?
Linear momentum is defined as the product of the mass (m) of an object and the velocity (v) of the object.
P = mv
where;
m is mass of the objectv is velocity of the objectUnit of momentum is given as; kgm/s
When unit of momentum is squared, = (kg.m/s)² = kg²m²/s²
Thus, when you square the unit of momentum, the new unit will be expressed as kg²m²/s².
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In an experiment, measurement of a ball moving at constant velocity finds that it traveled (3.2 ± 0.2) m during a time interval of (7.4 ± 0.8) s. What is the speed of the ball (best estimate and uncertainty) in proper form? Give vbest in the first blank and δv in the second. Avoid the use of scientific notation; it will not be necessary in this case as there will be one non-zero digit directly before or after the decimal.
Answers
(0.43 ± 0.08)m/s is the speed of the ball.
Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is traveling along a path. Speed can be thought of as the rate at which an object travels a distance, and it is a scalar quantity that denotes "how rapidly an object is traveling."
A fast-moving object travels at a high speed and completes a significant distance in a brief period of time. This is in contrast to an object traveling slowly, which travels a relatively short distance in the same length of time. Zero speed refers to an object that is not moving at all.
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5. You are concentrating on an exam, deciding between two answers that could possibility be right
for one of the questions. What part of the brain is activated during this task?
a. Temporal lobe
b. Occipital lobe
C.
Parietal lobe
d. Prefrontal cortex
Answers
Answer: D. prefrontal cortex
Explanation: The Prefrontal Cortex (PFC) and hippocampus are the most critical parts of the human brain for decision making
A body of mass 20g performs simple harmonic motion at a frequency of 10Hz. Its position is 10cm from the mean position, calculate its velocity
Answers
D=distance in cm
V=20 X 10 X 10
V=2000hz/cm
The outline of a partial periodic table is shown below.
You are making observations of an unknown metal. In which section of the periodic table should the unknown metal be located? a. Section 1 b. Section 2 c. Section 3 d. Section 4
Answers
Answer:
section 2
Explanation:
section 2 contains Alkali, Alkaline, Transition, and Post-transition metals
What does a negative acceleration indicate?
staying constant speed
moving backward
speeding up
moving forward
Answers
Can you give me the reference frame for every one of these please.
The sun rises over the horizon.
A bus moves past people standing on the sidewalk.
A passenger on that same bus sees a ball roll down the aisle.
Two trains traveling at the same speed on parallel tracks race past passengers who are waiting on a local station's platform.
A passenger on one of those trains looks out the window and sees the other train standing still.
A person standing near a railroad track sees a train pass by, then notices an airplane fly overhead in the same direction as the train, but at a much faster speed.
A passenger in that airplane looks down and sees the train moving backward.
A passenger in that airplane looks across the aisle and sees a child tossing a ball up and down.
Answers
A bus moves past people standing on the sidewalk, reference frame is people on the sidewalk.A passenger on that same bus sees a ball roll down the aisle, reference frame is the train aisle.
Two trains traveling at the same speed on parallel tracks race past passengers who are waiting on a local station's platform, reference frame is the station's platform.
A passenger on one of those trains looks out the window and sees the other train standing still, reference frame is the other train standing still.
A person standing near a railroad track sees a train pass by, then notices an airplane fly overhead in the same direction as the train, but at a much faster speed, reference frame is railroad track.A passenger in that airplane looks down and sees the train moving backward, reference frame is inside of the airplane.A passenger in that airplane looks across the aisle and sees a child tossing a ball up and down, reference frame is the aisle.
What is reference frame?
Reference frame can be described as the stationary background to which an object is compared to tell if it is moving.
A frame of reference is therefore a purely kinematical device, for the geometrical description of motion without regard to the masses or forces causing the motion.
The instance we discussed had different reference frames all of which are the stationary background of the objects.
In conclusion, reference frame of an object describes the motion without regard to the forces causing the motion.
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An atom is most balanced when it has an equal number of protons and electrons. True False
Answers
Answer: It is true.
Explanation: In all atoms, the number of electrons and protons is always equal. This preserves the atom's electrical neutrality by balancing positive and negative charges. If the amount of electrons and protons in an atom is not equal, the atom will have a net positive or negative charge, forming a cation or an anion.
scoliosis is a common disease of the spine where the spine is not straight but forma an S or C shape while viewing a patients from the front
Answers
The correct answer is Scoliosis is a spine curvature that occurs most frequently in adolescents.
Scoliosis is a spine curvature that occurs most frequently in adolescents.The most commonly used brace is made of plastic and contoured to fit the body. Because it fits under the arms and around the rib cage, lower back, and hips, this brace is almost invisible under clothing.
The majority of braces are worn between 13 and 16 hours per day. Idiopathic, congenital, and neuromuscular conditions The most common type of scoliosis is idiopathic. This means that the cause is unknown or that no single factor contributes to the disease's development.Scoliosis can improve with treatment, but it is not always a sign of something serious, and it is not always necessary if it is mild.
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If Sandy moves rightward 10 meters, what is true about her displacement?
Her displacement is zero.
O Her displacement is positive.
Her displacement negative.
Answers
A crane is used to raise one end of a steel girder off the ground, as shown in Figure 14. When the cable attached to the end of the girder is at 20° to the vertical, the force of the cable on the girder is 6.5 kN. Calculate the horizontal and vertical components of this force. Brider 20% 6.5 KN
Answers
The horizontal component of the force of cable is 2.22 kN. The vertical component of the force of cable is 6.1 kN.
If we draw a free body diagram of the force of the cable with its horizontal and vertical components, it will form a right angled triangle.
sin θ = Opposite side / Hypotenuse
cos θ = Adjacent side / Hypotenuse
θ = 20°
Hypotenuse = Force of cable = 6.5 kN
Opposite side = Horizontal component
Adjacent side = Vertical component
sin 20° = Horizontal component / 6.5
Horizontal component = 0.342 * 6.5
Horizontal component = 2.22 kN
cos 20° = Vertical component / 6.5
Vertical component = 6.1 kN
In a right angled triangle, trigonometric ratios can be used as mentioned below.
sin θ = Opposite side / Hypotenusecos θ = Adjacent side / Hypotenusetan θ = Opposite side / Adjacent sideTherefore,
The horizontal component of the force of cable is 2.22 kNThe vertical component of the force of cable is 6.1 kNTo know more about trigonometric ratios
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During a NASCAR race a car goes 50 m/s around a curved section of the track that has a radius of 250 m. What is the car's
acceleration?
Answers
Answer:10
Explanation: Acceleration of car is given by a= v^2/r, v= 50m/s, r= 250m a= 10 m/s^2 2
Hello what is U ? [tex]V=\frac{U}{q}[/tex]
Answers
Which set of labels should be used to correctly complete the atomic model below?
a.
1 - Electron
2 - Nucleus
3 - Neutron
4 - Proton
b.
1 - Proton
2 - Electron
3 - Neutron
4 - Nucleus
c.
1 - Neutron
2 - Proton
3 - Nucleus
4 - Electron
d.
1 - Proton
2 - Neutron
3 - Electron
4 - Nucleus
Answers
Answer:
d. 1-proton 2-nuetron 3-electron 4-nucleus
What is the speed of the electron when it is 10.0 cm from the +3.00 nC charge?
Answers
The speed of the electron when it is 10.0 cm from the +3.00 nC charge is 30×[tex]10^{-2}[/tex] meters per second.
Given :
q=3.00 nC
r=distance=10 c.m
we apply formula
Velocity of electron =qd
=10×[tex]10^{-2}[/tex]×3=30×[tex]10^{-2}[/tex] m/sec
The speed of electricity is determined by what you mean by the term "electricity." This is a broad term that essentially means "all things relating to electric charge." I'll presume we're talking about an electrical charge current moving through a metal wire, like the power cord of a light. Electrical currents passing through metal wires have three different velocities, all of which are physically significant:
The velocity of electron drift.
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The driver of a car slams on the brakes, causing the car to slow down at a rate of 17.0ft/s2 as the car skids 172ft to a stop
How long does the car take to stop?
What was the car's initial speed?
Answers
The time taken for the car to stop is 4.5 seconds and the initial speed of the car is 76.47 ft/s.
Initial speed of the carThe initial speed of the car is calculated as follows;
v² = u² + 2as
where;
v is the final velocity, when the car stops, v = 0u is the initial velocitya is the accelerations is the distance traveled0 = u² + 2as
0 = u² + 2(-17)(172)
0 = u² - 5858
u² = 5848
u = 76.47 ft/s
Time of motion of the carv = u + at
0 = 76.47 - 17t
17t = 76.47
t = 4.5 seconds
Thus, the time taken for the car to stop is 4.5 seconds and the initial speed of the car is 76.47 ft/s.
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which statement would need to be true for astrology to be considered a science?
Answers
A. Experimental evidence is collected that supports that astrology is to be considered a science.
Which statement best describes that the astrology is the part of science?Through experiments and researches, we can collect a lot of evidences about the relationship between science and astrology. If the evidences are in favour of astrology so we can say that astrology is to be considered as science. The invention of the astrology was made in Babylon far back in antiquity. An astrology is not considered to be the part of the science, because there is no evidence present in the history that the astrology is the part of the science. But the main thing is that the astrology contains the logics, and logics is present in the science. So there is a very small relation between the astrology and the science.
So we can conclude that Experimental evidence is collected that supports it is the correct statement.
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A. Experimental evidence is collected that supports it.
B. The majority of people believe that its claims are true.
C. Its explanations are supported by a scientific law.
d. Government funding is used to support it.
Liz rushes down onto a subway platform to find her train already departing. She stops and watches the cars go by. Each car is 8.60 m long. The first moves past her in 1.80 s and the second in 1.61 s. Find the constant acceleration of the train.
Answers
The constant acceleration of the train is 0.33 m/s.
The average velocity can be calculated by using the formula:
velocity = distance/time
For the 1st car, the velocity is calculated as:
v₁ = 8.60 m / 1.80 s = 4.78 m / s
For the second car, velocity can be calculated as:
v₂ = 8.60 m / 1.66 s = 5.34 m / s
Now we can solve for the acceleration using the formula:
v₂² = v₁² + 2 a d
Rewriting in terms of a, we get
a = (v₂² – v₁²) / 2 d
a = (5.34)² – (4.78)² / (2 × 8.6)
a = 0.33 m/s
Therefore, the constant acceleration of the train is 0.33m/s.
what is acceleration explain?
acceleration, fee at which speed modifications with time, in terms of each pace and course. A factor or an object shifting in a directly line is improved if it hastens or slows down. motion on a circle is improved even if the velocity is steady, due to the fact the route is constantly converting
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A rectangular box is h = 8.5 inches in height, w = 36.5 cm wide, and L = 0.55 yards long.
Please help!!!
Answers
The volume of the rectangular box is 39559.36 cm³.
What is volume?Volume can be defined as the capacity of a solid substance. The S.I unit of volume is m³.
To calculate the volume of the rectangular box, we use the formula below.
Formula:
V = lwh................... Equation 1Where:
V = Volume of the rectangular boxl = Length of the boxw = Width of the boxh = Height of the boxFrom the question,
Given:
l = 0.55 yards = 50.2 cmw = 36.5 cmh = 8.5 inches = 21.59 cmSubstitute these values into equation 1
V = (50.2×36.5×21.59)V = 39559.36 cm³Hence, the volume of the rectangular box is 39559.36 cm³.
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2. What does the term Brownian motion mean?
Answers
Answer:
The term Brownian motion is the random movement of particles in a liquid repeatedly collapsing with other molecules.
Explanation:
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2. 100 grams of oil (specific heat capacity 2200 J/kg °C) heated to 80°C are added
to 200 grams of water (specific heat capacity 4200 J/kg °C) at 20°C. Find the
resulting temperature. Assume heat loss to the surroundings is negligible.
Answers
100 grams of oil-heated to 80°C are added to 200 grams of water at 20°C. Then the resulting temperature would be 55.48°C.
What is thermal energy?It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.
As given in the problem 100 grams of oil (specific heat capacity 2200 J/kg °C) heated to 80°C is added to 200 grams of water (specific heat capacity 4200 J/kg °C) at 20°C
mCΔT for oil =mCΔT for water
100×2200×(80-T) = 200× 4200×(T-20)
1760-22T = 84 T -1680
62T = 1760+1680
T = 55.48°C
Thus, the resulting temperature of the mixture would be 55.48°C.
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Hypersonic scramjet. On March 27, 2004, the United States
successfully tested the hypersonic X-43A scramjet, which flew at
Mach 7 (seven times the speed of sound) for 11 seconds. (b) How many kilometers
did the scramjet travel during its 11 second test?
Answers
25.487 km did the scramjet travel during its 11 second test.
Given that the scramjet travels at a speed seven times that of sound, speed v is equal to 7 x 331 m/s or 2317 m/s.
(A) We require the scramjet's travel time over a distance of
d = 5000 km (5x10^6 m).
Using the formula
time taken = distance traveled/speed,
we can calculate the following:
(5x10^6)/2317 sec
= (5x10^6)/(23175x60) minute
= 5000000/139020 minutes
= 35.97 seconds
As 1 second equals 1/60 of a minute, Therefore, the travel time on Scramjet from San Francisco to New York will be 35.97 minutes.
(B) The distance covered by the Scramjet in 11 seconds must now be determined. as a result,
using speed, distance, and time relation.
Distance = Speed x Time
= 7 x 331 x 11
= 25487 m
Since 1 metre equals 1/1000 of a kilometer, 25487 m of 25.487 km
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What is the purpose of the Unified Standard?
a. It creates one size of universal thread among all fasteners.
b. It makes it possible to translate fastener names from one language to another.
Oc. It makes it possible to interchange fasteners from one country to another.
d. All of the above are true
Answers
The purpose of the Unified Thread Standard is to create one size of universal thread among all fasteners.
The Unified Thread Standard describes standard thread forms and sizes along with allowances, tolerances and designations. It is common in United states and Canada until 1949. Then it became incompatible with the newer standards so that it became obsolete from then.
It is a standard used for a wide variety of fasteners. The profile in this standard is 60°. 1 / 8 th of the outer side is cut off and 1 / 4 th of the inner side is cut off.
Therefore, the purpose of the Unified Thread Standard is to create one size of universal thread among all fasteners ( a ).
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order the list to describe the balls morion as it drops into the spring
Answers
The list in order that best describes the ball's motion as it drops into the spring is e, b, d, a, f and c.
The order is as follows:
e) The ball is dropped from rest and then negatively accelerates due to gravityb) The push from the spring exceeds the force of gravity. The ball momentarily comes to rest.d) Acceleration of the ball changes from negative to positive due to an upward push from the spring.a) The acceleration of the ball decreases as the spring extendsf) The ball leaves the spring with a large positive velocity. The acceleration is negative due to gravity.c) The velocity decreases due to negative gravitational acceleration.Option (e) come first because it the starting point. (b) comes next as the ball comes to rest as the spring is fully compressed. (d) comes next as the ball started its upward movement. (a) comes next as the spring is extending. (f) comes next as the ball has completely left the spring. (c) comes next as it indicates the balls movement after leaving the spring.+
Therefore, e, b, d, a, f and c is the correct order of explanation of the ball's movement.
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