Answer:
B. period of the sound wave
In a typically constructed research study, the experimental group is selected:
A. after selecting the control group.
B. systematically.
C. through random selection.
D. from a separate pool than is the control group.
Answer:
D. from a separate pool than is the control group.
Explanation:
in the picture the person answers is backwards but...
hope this helps have a nice day
If 12 photovoltaic cells at 0.5 V each produce a total of 6 V of potential energy and carry a 1 A current to your phone, what are the power output of these cells and the resistance inside your phone? P = VI and R = V/I (Show calculations and units)
The power output of the cells is 6 watts and the resistance inside the phone is 6 Ohms.
What is power output?Power Output can be defined as the average rate of electric energy delivery in a circuit.
The S.I unit of power is Watts (W)
Resistance can be defined as the opposition to the flow of electric current caused by a substance.
The S.I unit of resistance is Ohm, denoted with the symbol (Ω)
How to calculate the power output and resistanceUsing the formula given;
Power output, P = VI
where V = voltage = 0.5 × 12 V = 6V
I = current = 1 A
Power output = 6 × 1 = 6 Watts
Resistance = V ÷ I = 6 ÷ 1 = 6 Ohms
Therefore, the power output of the cells is 6 watts and the resistance inside the phone is 6 Ohms.
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Fig.3 shows three 10 g particles that have been glued to a rod of length L = 6 cm and negligible mass. The assembly can rotate around a perpendicular axis through point O at the left end. a) How much work is required to change the rotational rate from 40 to 60 rad/s?
b) If the outermost particle is removed, by what percentage does the rotational inertia of the assembly around the rotation axis decrease?
(a) The amount of work required to change the rotational rate is 0.0112 J.
(b) The decrease in the rotational inertia when the outermost particle is removed is 64.29%.
Moment of inertia of the rod
The moment of inertia of the rod from the axis of rotation is calculated as follows;
I = md² + m(2d)² + m(3d)²
where;
m is mass = 10 g = 0.01 kgd = 3 equal division of the lengthd = 6/3 = 2 cm = 0.02 m
I = md²(1 + 2² + 3²)
I = 14md²
I = 14(0.01)(0.02)²
I = 5.6 x 10⁻⁵ kg/m³
Work done to change the rotational rateK.E = ¹/₂Iω²
K.E = ¹/₂(5.6 x 10⁻⁵)(60 - 40)²
K.E = ¹/₂(5.6 x 10⁻⁵)(20)²
K.E = 0.0112 J
Percentage decrease of rotational inertia when the outermost particle is removedI₂ = md² + m(2d)²
I₂ = 5md²
ΔI = 14md² - 5md²
ΔI = 9md²
η = (ΔI/I) x 100%
η = (9md²/14md²) x 100%
η = 64.29 %
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Which dog has the most kinetic energy? A. A dog of mass 12 kg running with speed 6 m/s B. A dog of mass 10 kg running with speed 3 m/s C. A dog of mass 16 kg running with speed 5 m/s D. A dog of mass 14 kg running with speed 4 m/s
Answer:
A
Explanation:
KE = 1/2 m v^2
the greatest is A
What are you and the Australian Institute of Marine Biology trying to find out and 4. Why might it be important to find this information out
Answer:
Established in 1972 by the McMahon Government, the institute's primary function is research for sustainable use and protection of the marine environment. The Institute investigates topics from broad-scale ecology to microbiology.
How do light waves differ from sound waves?
Answer:
Light waves are electromagnetic waves while sound waves are mechanical waves. :)
The constant 40-N force is applied to the 36-kg stepped cylinder as shown. The centroidal radius of gyration of the cylinder is k = 200 mm, and it rolls on the incline without slipping. If the cylinder is at rest when the force is first ap- plied, determine its angular velocity weight seconds later.
The angular velocity of the stepped cylinder is determined as 2.35 rad/s.
Centripetal acceleration of the cylinder
The centripetal acceleration of the cylinder is calculated as follows;
F = ma
a = F/m
a = 40/ 36
a = 1.11 m/s²
Velocity of the cylindera = v²/r
v² = ar
v² = 1.11 x 0.2
v² = 0.222
v = 0.47 m/s
Angular velocity of the cylinderv = ωr
ω = v/r
ω = 0.47/0.2
ω = 2.35 rad/s
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Question 4 (2 points)
Which one of the following is not a leg muscle?
a) Teres Major muscle
b) Plantaris tendon
c) Sartorius muscle
d ) Semimembranosus muscle
The answer is a) Teres Major Muscle
an aluminium object has a mass of 27kg and density of 2700 the object is atached to a spring and immerged in a tank of water determine. what is volum of object ?
Answer:
0.01m^3
Explanation:
m=27
density=2700
density=mass/volume
2700=27/volume
volume=27/2700=0.01
A student wants to know: “How does the number of lightbulbs affect current in a series circuit?” Identify the independent and dependent variables in the experiment.
The number of lightbulbs in a series circuit will not affect the current flowing through them. The independent variable is resistance. The dependent variable is voltage.
What is current?The current is the stream of charges which flow inside the conductors when connected across the end of voltage.
For the given set of series bulbs as resistors, the current flowing through all the bulbs will the same. Voltage is divided to each resistor.
From the Ohm's law, V =IR
R = V/I
Here, R is the proportionality constant. So, this is independent value.
The voltage difference across the resistors dependent on the current flowing through that resistance.
Thus, the number of lightbulbs in a series circuit will not affect the current flowing through them. The independent variable is resistance. The dependent variable is voltage.
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the magnitude of the momentum of a car is 13,300 kg*m/s if it has a speed of 14 m/s what is the mass of the car?
what is a geostationary satellite
Answer:
See below
Explanation:
Geostationary satellites are placed in orbit above the equator at an orbital altitude of 35786 km in order to perfectly match the earth's rotation...thus they APPEAR stationary in the sky ..... then your DISH TV antenna (etc) can point in one direction at them for continuous communication. Or.... a spy or weather satellite would be able to look at one section of the earth non-stop
A 208.4 N force is pulling a 197 kg object across a horizontal surface.
The 208.4 N force acts at 32 degrees above the horizontal.
The coefficient of kinetic friction between the object and the surface is 0.455,
and the object is moved 161.5 m.
What work is done by the pulling force?
.
What work is done by kinetic friction?
.
Work done
FscosØ208.4(161.5)cos3233656.6cos3228542.4JWork done by kinetic friction:-
[tex]\mu_kN[/tex][tex]\sf \mu_Kmg[/tex]0.455(197)(9.8)878.423NAnswer:
The Work done is 28542.4J.
The work done by the kinetic friction is 878.423N
Given:
FscosØ
We put the values together.
208.4(161.5)cos32
33656.6cos32
28542.4J
Work done by kinetic friction:-
Given the formula, we put the values.
0.455(197)(9.8)
878.423N
A child jumps from a moving sled with a speed of 2.2 m/s and in the direction opposite the sled's motion. The sled continues to move in the forward direction, but with a new speed of 5.5 m/s. If the child has a mass of 38 kg and the sled has a mass 68 kg, what is the initial velocity of the sled?
Answer:
p=mv , m1*v1 = m2*v2 , 2.2*38 = 68*v2 -> v2=1.23 , vf=vi+v2 -> vi=vf-v2 -> vi=5.5-1.23=4.27
my apologies if it's wrong
let the child jump, do ur work~~~
hope helpz~
How is gravity involved in the formation of stars?
One Affective way to develop the feeling function in one’s personality is to

A. Imagine how other people might feel in the situation
B. Plan out the details for each week
C. Socialize more with strangers
D. Consider the consequences of one’s actions
Answer:
A.
Explanation:
I think it’s a. Because, I normally think about how someone else feels if I want to say something.
A girl pushes herself up a steep ramp in her
wheelchair. She gains a vertical distance of
25.8 m when she reaches the top of the ramp.
She turns around and coasts back down the ramp
If the combined mass of the girl and her wheelchair
is 64.6 kg, what would be her coasting speed at the
bottom of the ramp?!Show all your work.
Answer:
22.5m/s, this is assuming conservation of energy and that the girl starts coasting from rest
Explanation:
conservation of energy: mgh = 1/2 m*v^2
h = 25.8m, m = 64.6kg, g=9.81m/s^2
plug in and solve for v
v = sqrt(2gh) = sqrt(2*9.81*25.8) = 22.5m/s
The coasting speed of the girl at the bottom of the ramp would be approximately 22.4 m/s.
To find the coasting speed at the bottom of the ramp, we can apply the conservation of energy principle. At the top of the ramp, the initial potential energy is converted into kinetic energy at the bottom of the ramp.
Calculate the potential energy at the top of the ramp:
Potential energy (PE) = mass (m) * acceleration due to gravity (g) * height (h)
PE = 64.6 kg * 9.8 m/s² * 25.8 m = 16114.284 J
At the bottom of the ramp, all the potential energy will be converted into kinetic energy:
Kinetic energy (KE) = 0.5 * mass (m) * velocity²
16114.284 J = 0.5 * 64.6 kg * velocity²
Solve for velocity:
velocity² = 2 * (16114.284 J) / 64.6 kg
velocity² = 500 m²/s²
velocity = √(500 m²/s²) ≈ 22.4 m/s
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When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Best Answer will be marked as brainliest
[tex]\large{\underline{\underline{\pmb{\frak {\color {red}{Question:}}}}}}[/tex]
[tex] \sf \red{When \: baking \: soda \: is \: mixed \: with \: lemon \: juice, \: bubbles \: are \: formed \: with \: the \: evolution \: of \: a \: gas.}[/tex]
[tex]\large{\underline{\underline{\pmb{\frak {\color {blue}{Answer:}}}}}}[/tex]
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. The gas is formed in the reaction is Carbon dioxide. [tex] CO_{2}[/tex] is formed.
The change which happened in this reaction is a chemical change.
[tex] \boxed{ \frak \green{Explanation}}[/tex]
Since, in chemical change we can't bring a substance to it's actual form how it was in earlier.
Examples: burning of paper is chemical, since we can't get the fine paper again after it is burnt.
Thus, the above reaction is also a chemical change, since we can't get back the lemon juice how it was earlier.
[tex] \boxed{ \frak \red{Brainlysamurai}}[/tex]
which of the following is a key to your success in this pe course
A key to an individual's success in this PE course is honesty.
What is PE?PE is an acronym for physical education and it can be defined as a course (subject) which is taught in schools, so as to provide students with information on how to promote good health and physical fitness.
Some of the factors that affects a student's success in different physical education (PE) courses include the following:
Being in top physical shapeA good memoryGood eyesightHonestyIn this scenario, honesty is key to an individual's success in this PE course.
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food does not pass through the liver or the pancreas why are these organs dtill important parts of the digestive system?
Your pancreas makes a digestive juice that has enzymes that break down carbohydrates, fats, and proteins. The pancreas delivers the digestive juice to the small intestine through small tubes called ducts. Liver. Your liver makes a digestive juice called bile that helps digest fats and some vitamins.
Digestive enzymes are made by the pancreas and aid in the breakdown of proteins, carbs, and lipids. Bile, a liquid made by the liver that aids in fat digestion, is produced.
What is meant by digestive system ?The digestive system breaks down the food we consume into its most basic components, such as glucose (sugar), amino acids (which make up protein), or fatty acids (which make up lipids).
Here,
The digestive system of humans is made up of a fully formed alimentary canal and the glands that are located there. The alimentary canal, which includes the mouth, oral cavity or buccal cavity, pharynx, oesophagus, stomach, small intestine, large intestine, and anus, is encircled by glandular epithelium.
The nutrients from the digested food are subsequently transported to every cell in the body thanks to absorption into the bloodstream from the small intestine.
Although they are not a part of the alimentary canal, the pancreas, which is located beneath the stomach, the gallbladder, and the liver are all vital for digestion.
Hence,
Digestive enzymes are made by the pancreas and aid in the breakdown of proteins, carbs, and lipids. Bile, a liquid made by the liver that aids in fat digestion, is produced.
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1. What are the two factors affecting friction
A bunny hopping along the road can travel at an average of 0.6 m/s. Calculate far the bunny can travel in 11 seconds.
Answer:
6.6 m
Explanation:
.6 m/s * 11 s = 6.6 m ( see how the 's' cancels out and you are left with 'm' as the answer ?)
An ocean liner leaves New York City and travels 18.0o north of east for 155 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ship’s displacement vector in the north and the east direction, respectively?
a steam engine work on its vicinity 285 k heat is released with the help of 225 c energy absorbed to the system what is the efficiency of steam engine explain the use of the rest of the energy physic problem
The efficiency of the steam engine is 78.9% because the rest of the work input is used to overcome friction.
What is efficiency of machines?Efficiency of a machine expresses the useful work done by a a machine as a percentage.
Efficiency of a machine = work output/work input × 100 %%The efficiency of machines are always less than 100% percent due to energy losses due to friction and heat.
For the steam engine:
Work output = 225 J
Work input = 285 J
Efficiency = 225/285 × 100% = 78.9 %
Therefore, the efficiency of the steam engine is 78.9% because the rest of the work input is used to overcome friction.
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find potential at a point on the line , containing two charges " q " and " 4q " at a distance of " r " metres , where net E due to these charges is same.
The potential at a point on the line will be,[tex]\rm E_{net}=\frac{5Kq}{r}[/tex].The net potential is the algebraic sum of the electric potential.
What is the electrical potential difference?The amount of work performed in an electrical field to move a unit charge from one location to another is defined as the electrical potential difference.
In other terms, the potential difference is the difference in electric potential between two charged substances.
The traditional current flow is from positive to negative terminals, indicating the movement of positive charges in that direction.
[tex]\rm E_1 = \frac{Kq}{r} \\\\ E_2=\frac{K(4q)}{r}[/tex]
The potential at a point on the line is found as;
[tex]\rm E_{net}=E_1+E_2 \\\\\ E_{net}=\frac{Kq}{r} +\frac{K(4q)}{r} \\\\E_{net}=\frac{5Kq}{r}[/tex]
Hence, the potential at a point on the line will be,[tex]\rm E_{net}=\frac{5Kq}{r}[/tex]
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Part B
Keep track of how many hours you use the appliance in one day, and record the value below. You might want to track the
time in minutes and convert it to hours using this formula:
time in minutes = time in hours.
60
BIU X¹ X₂ 10pt
A
≡ ≡ 四
The number of kilowatts used by an individual to operate his appliances is determined as 12.1 kWh.
Average daily power consumptionThe average daily power consumption is the amount of electric energy consumed by an individual on a daily rate.
The average daily power consumption of individuals in USA is 12,100 W-hr.
Converting watts to kilowattsE = 12,100 Whr/1000
E = 12.1 kWh
Thus, the number of kilowatts used by an individual to operate his appliances is determined as 12.1 kWh.
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A marble rolls off a tabletop 1.15 m high and hits the floor at a point 4 m away from the tables edge in the
horizontal direction.
a. How long is the marble in the air?
b. What is the speed of the marble when it leaves the tables edge?
Im/s
C. What is its speed when it hits the floor?
A marble rolls off a tabletop 1.15 m high and hits the floor at a point 4 m away from the edge of the table in the horizontal direction,
t= 0.45 seconds.V=2.22m/sVT=4.95 m/sThis is further explained below.
What is its speed when it hits the floor...?Generally, the equation for motion is mathematically given as
S= ut + 0.5at²
Therefore
y = Voy t + 0.5gt^2
1 = 0.5x 98 x 6²
1=4.9t^2
[tex]t=\sqrt{0.2041 }[/tex]
t= 0.45 seconds.
b) Horizontal motions are uniform.
V=Horizontal displacement/time
V=1/0.45
V=2.22m/s
C)
Vx: 2.22 m/s At bottom,
Vy² = Voy² + 2as
Vy² = 2x95x1
Vy² = 19.6
Total velocity
[tex]VT=\sqrt{( 2.22 m/)^2+19.6}[/tex]
VT=4.95 m/s
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Which two questions can be used to identify criteria for how successful the design of ineffective high altitude drone is?
A. Will it become more popular than the last drone design?
B. Does it improve efficiency by 35%?
C. Can it reach an altitude of 8000 m?
D. Will it cost more than the last drone design?
E. Does it also work at low altitudes?
Option A and D are the right answer for the successful design of ineffective high altitude drone.
What are the two questions?''Will it become more popular than the last drone design?'' and ''Will it cost more than the last drone design?'' are the two questions that can be used to identify criteria for the successful design of ineffective high altitude drone because popularity and cost are the two factors which plays greater role in the success of a design.
So we can conclude that option A and D are the right answer for the successful design of ineffective high altitude drone.
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Three sticks are arranged to form a right triangle. If the lengths of the three sticks are 0.47 m, 0.62 m and 0.78 m, what are the three angles of the triangle?
Which of these accurately identify characteristics of light and mechanical waves? Select the TWO (2) that apply.
A. Light waves are electromagnetic waves that can travel through a vacuum.
B. Mechanical waves can travel through a vacuum
C. Light waves need a medium through which to travel.
D. Water waves are examples of mechanical waves.
The two correct statement are A and B. Light waves are electromagnetic waves that can travel through a vacuum. Mechanical waves can travel through a vacuum.
What is an electromagnetic wave?
EM waves are the electromagnetic radiations are made up of electromagnetic waves created when an electric field collides with a magnetic field.
Electromagnetic waves may alternatively be defined as the combination of oscillating electric and magnetic fields.
Electrically charged particles experiencing acceleration create electromagnetic waves, which can then interact with other charged particles and exert force on them.
The two correct statement is;
1. Light waves are electromagnetic waves that can travel through a vacuum.
2. Mechanical waves can travel through a vacuum.
Hence,two correct statement are A and B.
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