Answer:
Explanation:
Because if you don't have strong bones, you will have problems with your health. So, a strong skeletal system is important for leading a healthy life.
at 27 degrees C and 750 mmhg a sample of hydrogen occupies 5.0 L how much space will occupy at STP
Answer:
Explanation:
The number of mole of the hydrogen sample at 27 C and 750 mmHg pressure is:
\(n=\frac{PV}{RT}=\frac{(0.9898\times 10^{5})(5\times 10^{-3})}{(8.314)(27+273)}\approx 0.0198\) mol
This number of mole will be the same although we change the pressure and temperature. For STP (Temperature = 0 C = 273 K, and Pressure = 760 mmHg = 76 cmHg = 1 Bar = 1.01 x \(10^{5}\) Pa):
\(P'V'=nRT' \rightarrow V'=\frac{nRT'}{P'}=\frac{0.0198(8.314)(273)}{1.01\times 10^{5}}\approx 44.49 \times 10^{-5}\) in \(m^{3}\). But in L, we find that V' = 0.4449 L
1. Fenway Park's small dimensions and the Green Monster have what overall effect on baseball statistics?
What order does energy flow: sun prodecer consumer?
Energy flows from the Sun to producers, then to primary consumers, secondary consumers, and potentially to tertiary consumers, forming a pyramid-shaped structure that represents the transfer of energy through different trophic levels in an ecosystem.
Energy flows in a specific order through various components of an ecosystem, starting with the Sun and progressing through producers and consumers. This flow of energy is known as the energy pyramid or trophic levels.
At the base of the energy pyramid is the Sun, which is the ultimate source of energy for most ecosystems on Earth. Sunlight provides the energy needed for photosynthesis, a process carried out by plants, algae, and some bacteria, collectively known as producers. These organisms convert solar energy into chemical energy through photosynthesis, using carbon dioxide and water to produce glucose and oxygen. This process captures and stores energy in the form of organic compounds.
The next level in the energy pyramid consists of primary consumers, also known as herbivores. These are animals that feed directly on producers, such as grazing animals or insects that consume plants. Herbivores obtain energy by consuming plant material and breaking down the organic compounds present in the plants into simpler forms, such as sugars and amino acids, through digestion.
Above the primary consumers are the secondary consumers, which are carnivores or omnivores that feed on herbivores. They obtain energy by consuming primary consumers and breaking down the organic compounds in their prey through digestion. This energy transfer continues up the trophic levels, with each level consuming the one below it.
At the top of the energy pyramid are tertiary consumers, which are typically apex predators. They are carnivores that consume other carnivores. Tertiary consumers obtain energy by consuming secondary consumers and breaking down the organic compounds in their prey.
It's important to note that energy is not efficiently transferred between trophic levels. Only a fraction of the energy consumed at each level is converted into biomass and passed on to the next level. This inefficiency is due to processes such as respiration, heat loss, and incomplete digestion.
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A 5.00 cm tall object is placed 2.7 cm in front of a concave mirror and produces a real image that is 14.3 cm from the mirror. What is the magnification of the object?
We are asked to determine the magnification of a concave mirror. To do that we will use the following formula:
\(M=\frac{h_i}{h_0}=-\frac{d_i}{d__0}\)Where:
\(\begin{gathered} M=\text{ magnification} \\ h_0=\text{ height of the object} \\ h_i=\text{ height of the image} \\ d_0=\text{ distance of the object } \\ di=\text{ distance of the image} \end{gathered}\)We are given the following values:
\(\begin{gathered} h_0=5cm \\ d_0=2.7cm \\ h_i=14.3cm \end{gathered}\)Therefore, we can use the following to determine the magnification:
\(M=\frac{h_i}{h_0}\)Substituting the values:
\(M=\frac{14.3cm}{5cm}\)Solving the operation:
\(M=2.86\)Therefore, the magnification is 2.86
An ideal fluid is moving at 3.0 m/s in a section of a pipe of radius 0.20 m. If the radius in another section is 0.35 m, what is the flow speed there
The flow speed of the fluid in the second section of the pipe is 0.98 m/s
What is flow speed?Flow speed is the rate at which the distance of a fluid changes with respect to time as it moves in a pipe.
To calculate the flow speed in the second section, we use the formula below.
Formula:
AV = A'V'............ Equation 1Where:
A = Cross-sectional area of the first section of the pipeV = Velocity of fluid in the first section of the pipeA' = cross-sectional area in the second section of the pipeV' = Velocity of fluid in the second section of the pipe.Make V' the subject of the equation
V' = AV/A'......... Equation 2From the question,
Given:
A = πR² = 0.04π m²V = 3 m/sA' = πr² = (0.35²×π) = 0.1225π m²Substitute these values into equation 2
V' = 3(0.04π)/(0.1225π)V' = 0.98 m/sHence, The flow speed of the fluid in the second section of the pipe is 0.98 m/s
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A strong, weightless rope has a 0.15 kg mass hanging from the middle of it, as in the image. What tension force will make the rope
horizontal, corresponding to 0=0*?
Answers:
0.98 N
• No tension force can do this.
9.8 N
1.5 N
The tension force on the rope that will make it balance horizontal is 1.5 N.
The given parameters:
Mass of the rope, m = 0.15 kgThe tension force on the rope that will make it balance horizontal is determined by applying Newton's second law of motion as shown below;
T = mg
where;
g is acceleration due to gravity
T = 0.15 x 9.8
T = 1.47 N
T ≈ 1.5 N
Thus, the tension force on the rope that will make it balance horizontal is 1.5 N.
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Answer:no tension force can do this.
Explanation:
I’m not sure why, I’ve tried looking through my notes but can’t find why.
The picture shows a triangular island:Which expression shows the value of z? x sin 50°y/cos 50° x cos 50°y/sin 50°
In order to find an expression for z, we can use the sine and cosine relations of the angle 50°.
The sine is equal to the opposite leg over the hypotenuse, and the cosine is equal to the adjacent leg over the hypotenuse.
So we have:
\(\begin{gathered} \sin50°=\frac{x}{z}\\ \\ z=\frac{x}{\sin50°}\\ \\ \\ \\ \cos50°=\frac{y}{z}\\ \\ z=\frac{y}{\cos50°} \end{gathered}\)Therefore the correct option is the second one.
2(a)Find the density of air filled in polythene container with mass of 0.419kg when it is empty. When filled with extra air its mass increased to 0.428kg also the top of polythene container mass connected to the perplex box of volume 1000cm³ and the number of times of air inside was 7.2 times
When filled with extra air its mass increased to 0.428kg also the top of polythene container mass connected to the perplex box of volume 1000cm³ and the number of times of air inside was 7.2 times. The density of the air filled in the polythene container is approximately 1.25 kg/m³.
The density of air filled in the polythene container can be determined by considering the change in mass and volume of the container before and after filling it with air. Given that the mass of the empty container is 0.419 kg and the mass of the container when filled with extra air is 0.428 kg, and the volume of the perplex box is 1000 cm³.
Calculate the mass of the air inside the container by subtracting the mass of the empty container from the mass of the container when filled with air:
Mass of air = Mass of filled container - Mass of empty container
= 0.428 kg - 0.419 kg
= 0.009 kg
Calculate the volume of the air inside the container using the given number of times the air inside is 7.2:
Volume of air = Volume of perplex box * Number of times air inside
= 1000 cm³ * 7.2
= 7200 cm³
Convert the volume of air to cubic meters (m³) by dividing by 1000000:
Volume of air = 7200 cm³ / 1000000
= 0.0072 m³
Calculate the density of air using the formula:
Density = Mass / Volume
Density = 0.009 kg / 0.0072 m³
≈ 1.25 kg/m³
Therefore, the density of the air filled in the polythene container is approximately 1.25 kg/m³.
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Pure sodium metal explodes when it makes contact with water, and chlorine, in its natural state, is a deadly, poisonous gas. When these two chemicals combine, they form a harmless, white powder known as sodium chloride or table salt. Which of the following statements does this information support?
A.The properties of substances change during chemical reactions but then later go back to their original condition.
B.Heat must be added in order to change the chemical properties of substances.
C.When substances are chemically combined, the properties of the new substances that are formed are often different from the properties of the original substances.
D.When substances are chemically combined, the properties of the new substances that are formed are the same as the properties of the original substances.
Answer: When substances are chemically combined, the properties of the new substances that are formed are often different from the properties of the original substances.
Explanation:
In the diagram, the distance OP is the focal length of the converging lens. One ray of light from O
is shown.
Through which point will this ray pass, after refraction by the lens?
The point through which this ray will pass, after refraction by the lens is point D.
What is refraction of light?The refraction of light refers to the bending or change in direction that occurs when light passes from one medium to another. It is a phenomenon that happens due to the difference in the speed of light in different substances.
From the ray diagram given, after the light incident from point O, it will pass the converging at point D which is the focal length of the lens after refraction.
Thus, based on the converging lens given in the ray diagram, we can conclude that, the point through which this ray will pass, after refraction by the lens is point D.
So point D is the correct answer.
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A rifle of mass 4.0 kg fires a 12.0 g bullet. If the bullet travels at a velocity of 1,500.0 m/s, what is the recoil of the gun?
Answer:
Explanation:
Conservation of momentum
Initial momentum is zero as both gun and bullet are motionless in the frame of reference before firing.
0 = 0.012(1500.0) + 4.0v
v = - 4.5 m/s
Must be a rail gun as the fastest powder driven bullets are moving at roughly half the speed described.
Question 12 of 20
In which scenario will the two objects have the least gravitational force
between them?
O A. Mass of object 1 = 15 kg
Mass of object 2 = 12 kg
Distance between objects = 1.5 m
O B. Mass of object 1 = 15 kg
Mass of object 2 = 12 kg
Distance between objects = 0.5 m
C. Mass of object 1 = 12 kg
Mass of object 2 = 12 kg
Distance between objects = 1.5 m
D. Mass of object 1 = 12 kg
Mass of object 2 = 12 kg
Distance between objects = 0.5 m
Answer:
C. Mass of object 1 = 12 kg
Mass of object 2 = 12 kg
Distance between objects = 1.5 m
Explanation:
From the universal gravitation equation
Force of gravity between two objects is directly proportional to the product of mass 1 and mass 2 and inversely proportional to the square of the distance apart
Option B is has the greatest factor
Force of gravity between the objects = (15 x 12)/(0.5)^2
Force of gravity between the objects = 720G
Option C has the least factor and the answer
Force of gravity between the objects = (12 x 12)/(1.5)^2
Force of gravity between the objects = 64G
G = The constant of proportionality = 6.673 x 10-11 N m^2/kg^2
What is the net force (in N) of a 3.00 N force and an 8.00 N force acting on an object for each of the following conditions?
b) The forces act in the same direction.
If the energy released by an electron making a transition from one hydrogen atom orbit to another is 3.02 ✕ 10^−19 J, what is the wavelength (in nm) of the photon?
Answer:
The wavelength of the photon can be calculated using the equation E = hc/λ, where E is the energy, h is Planck's constant (6.626 ✕ 10^−34 J s), c is the speed of light (2.998 ✕ 10^8 m/s), and λ is the wavelength.
λ = hc/E = (6.626 ✕ 10^−34 J s) (2.998 ✕ 10^8 m/s) / (3.02 ✕ 10^−19 J) = 656.4 nm
Explanation:
Three forces act on a moving object. One force has a magnitude of 84.4 N and is directed due north. Another has a magnitude of 42.7 N
and is directed due west. What must be (a) the magnitude and (b) the direction of the third force, such that the object continues to
move with a constant velocity? Express your answer as a positive angle south of east.
The direction of the third force, such that the object continues to
move with a constant velocity is 94.5N at 0.19° south of east.
What is applied force?The force that one thing exerts on another. A barrel being pushed by a human is an illustration of applied force. When the individual pushes the barrel, the barrel experiences an applied force. Newton's second law of motion defines the force formula as follows: A force is equal to an object's mass times its acceleration, or F = m a. You must use SI units when applying this formula: kilograms for mass, meters per second squared for acceleration, and newtons for force. a push or pull that an object has experienced. Here, an object is given a force by a person or any other thing. A chair being pushed to the opposite side of the room, for instance.
For the object to move with constant velocity the total acceleration must be zero.
So,
Total F = \(F_{1} +F_{2} +F_{3}\)
ma = 0
\(F_{1}\) = 84.4N
\(F_{2}\) = 42.7 N
\(F_{3} = -F_{1} - F_{2}\)
= 94.58 N
TanФ = 0.19°
Hence \(F_{3}\) = 94.5N at 0.19° south of east.
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How do I find max spring potential energy? I am given a position time graph and mass.
To find the maximum spring potential energy the following formula should be used U = 1/2 kx^2.
How to calculate the maximum potential energy of a spring?To find the maximum potential energy of a spring, you need to know two things: the spring constant (k) and the maximum displacement (x) from its equilibrium position.
The formula for calculating the potential energy stored in a spring is:
U = 1/2 kx^2
where U is the potential energy, k is the spring constant, and x is the displacement from equilibrium.
Therefore you need to determine the maximum displacement (x) from its equilibrium position. This can be done by measuring the distance between the spring's stretched or compressed position and its original position when it's at rest.
Once you know the maximum displacement (x), you can plug that value and the spring constant (k) into the equation to calculate the maximum potential energy stored in the spring.
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Two Earth satellites, A and B, each of mass m = 940 kg , are launched into circular orbits around the Earth's center. Satellite A orbits at an altitude of 4500 km , and satellite B orbits at an altitude of 11100 km .
c) How much work would it require to change the orbit of satellite A to match that of satellite B?
Answer:
The required work done is \(6.5\times10^{9}\ J\)
Explanation:
Given that,
Mass of each satellites = 940 kg
Altitude of A = 4500 km
Altitude of B = 11100 km
We need to calculate the potential energy
Using formula of potential
\(U_{A}=-\dfrac{Gm_{A}m_{E}}{r_{A}}\)
Put the value into the formula
\(U_{A}=-\dfrac{6.67\times10^{-11}\times940\times5.98\times10^{24}}{6.38\times10^{6}+4.50\times10^{6}}\)
\(U_{A}=-3.44\times10^{10}\ J\)
We need to calculate the potential energy
Using formula of potential
\(U_{B}=-\dfrac{Gm_{B}m_{E}}{r_{A}}\)
Put the value into the formula
\(U_{B}=-\dfrac{6.67\times10^{-11}\times940\times5.98\times10^{24}}{6.38\times10^{6}+11.10\times10^{6}}\)
\(U_{B}=-2.14\times10^{10}\ J\)
We need to calculate the value of \(k_{A}\)
Using formula of \(k_{A}\)
\(k_{A}=-\dfrac{1}{2}U_{A}\)
Put the value into the formula
\(k_{A}=\dfrac{1}{2}\times3.44\times10^{10}\)
\(k_{A}=1.72\times10^{10}\ J\)
We need to calculate the value of \(k_{B}\)
Using formula of \(k_{B}\)
\(k_{B}=-\dfrac{1}{2}U_{B}\)
Put the value into the formula
\(k_{B}=\dfrac{1}{2}\times2.14\times10^{10}\)
\(k_{B}=1.07\times10^{10}\ J\)
We need to calculate the work done
Using formula of work done
\(W=\Delta K+\Delta U\)
\(W=(k_{B}-k_{A})+(U_{B}-U_{A})\)
\(W=(-\dfrac{U_{B}}{2}+\dfrac{U_{A}}{2})+(U_{B}-U_{A})\)
\(W=\dfrac{1}{2}(U_{B}-U_{A})\)
Put the value into the formula
\(W=\dfrac{1}{2}\times(-2.14\times10^{10}+3.44\times10^{10})\)
\(W=6.5\times10^{9}\ J\)
Hence, The required work done is \(6.5\times10^{9}\ J\)
Expert help me
When firing a rifle, the bullet is shot at a high speed as the rifle recoils in the opposite directo How do you compare the force which they impart on each other? • How do you then explain the big difference in the velocities of two? Would you care to fire a rifle whose bullet is ten times as massive as the rifle? Why or why not?
Answer:
See below
Explanation:
The forces are equal but opposite directions
the velocities of the two differ because of the different masses of the two objects....the bullet is light compared to the rifle/shooter.
I would not want to fire a heavy projectile...the 'kick' or 'recoil' of the rifle would be quite large.....and painful!
Can some one answer this please NO LINKS !!!
What causes drag?
1: decrease in velocity
2: Bernoulli´s principle
3: friction
4: lift
Answer:
3) Friction
Explanation:
Hope it helps
Peace out
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a) The force acting on a rotating rotor kite is 0.85 N. If the radius of rotation is 2.0 m, and the kite has mass of 0.35 kg, calculate the angular speed of the kite. Give the angular speed in both rad/s and rpm.
b) What is the cost of operating a 60-W light bulb for 3 days, if the cost of electricity is $0.088 per kW · h?
(a) The angular speed of the kite is 1.1 rad/s or 10.5 rpm
(b) The cost of operating a 60-W light bulb for 3 days is $0.38.
What is the angular speed?The angular speed is calculated as follows;
ω = √(F / (mr))
where;
F is the forcem is the mass of the kiter is the radius of rotation ω is the angular speed.ω = √(0.85 N / (0.35 kg x 2.0 m))
ω = 1.1 rad/s
The angular speed in rpm is calculated as;
ω = 1.1 rad/s x 1rpm/2π x 60s/1min
ω = 10.5 rpm
(b) Power is the rate at which energy is consumed, and it is given by the formula:
P = E / t
where;
P is powerE is energyt is time.E = P x t
E = 60 W x 3 days x 24 hours/day x 3600 s/hour
E = 15,552,000 J
In kW · h;
= 15,552,000 J / (1000 W/kW x 3600 s/h)
= 4.32 kWh
The cost of this energy can be calculated as;
Cost = 4.32 kWh x $0.088/kW h
Cost = $0.38
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What happens to a circuit's resistance (R), voltage (V), and current (1) when
you decrease the length of the wire in the circuit?
O A. Rincreases.
V decreases.
I decreases.
B. R decreases.
Vis constant.
Zincreases
C. Ris constant.
Vincreases.
/ increases.
D. Rincreases.
Vis constant
I decreases
Answer:
D.
R increases
V is constant
I decreases
Explanation:
The resistance of a wire is given by the following formula:
\(R = \frac{(Resistivity)(L)}{A}\)
It is clear from this formula that resistance is directly proportional to the length of wire. So, when length of wire is increased, the resistance of circuit increases.
The voltage in the circuit will be constant as the voltage source remains same and it is not changed.
Now, we can use Ohm Law:
V = IR
at constant V:
I ∝ 1/R
it means that current is inversely proportional to resistance. Hence, the increase of resistance causes the current in circuit to decrease.
Therefore, the correct option will be:
D.
R increases
V is constant
I decreases
Fig above shows a wave traveling through a medium. Use the fig to answer the questions below.
A.)What is the amplitude of the wave ? Include correct units.
B.)Use the graph to determine the time of one wave. Use it to find the frequency.
C.)If the speed of the wave is 25 m/s, what is the wavelength of the wave ? Show data listing, equation , substitution leading to the answer for full credit.
(a) The amplitude of the wave is 0.2 m.
(b) The period of the wave is 4 s.
(c) The wavelength of the wave is 100 m.
What is the amplitude of the wave?(a) The amplitude of the wave is the maximum displacement of the wave.
amplitude of the wave = 0.2 m
(b) The period of the wave is the time taken for the wave to make one complete cycle.
period of the wave = 5.5 s - 1.5 s = 4 s
(c) The wavelength of the wave is calculated as follows;
λ = v / f
where;
v is the speed of the wavef is the frequency of the wavef = 1/t = 1 / 4s = 0.25 Hz
λ = ( 25 m/s ) / 0.25 Hz
λ = 100 m
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Soccer can be traced back to the early Greeks and Romans.
O True
O False
Can Soccer be traced back to the early Greeks and Romans
Answer:
O False,
Explanation:
Although the game of soccer has been around for more than 2,000 years, soccer as we know it today is traced back to England. The game was once played in ancient China, Greece, Rome, and Japan but with different rules and variations.
supposed the Kingfisher Dives with an average speed of 4.6 m / s for 1.4 seconds before hitting the water. What is the height from which the bird dove
Answer:
h = 1.07 m
Explanation:
It is given that,
The average sped of the kingfisher, v = 4.6 m/s
Time, t = 1.4 s
Final speed, v = 0 (as it hits the water)
We need to find the height from which the bird dove. Let the height is h. According to the conservation of energy.
\(mgh=\dfrac{1}{2}mv^2\\\\h=\dfrac{v^2}{2g}\\\\h=\dfrac{(4.6)^2}{2\times 9.8}\\\\h=1.07\ m\)
So, the bird dove from a height of 1.07 m.
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. He notes that it takes 0.9 s for the wave to travel the 26 m to the opposite tower. If one meter of the rope has a mass of 0.28 kg, find the tension in the tightrope.
Answer:
the tension in the tightrope is 233.68 N
Explanation:
Given the data in the question;
Time taken to reach the opposite tower t = 0.9 s
Distance between the two towers S = 26 m
mass per one meter length = 0.28 kg
First we calculate the velocity;
Velocity V = Distance / time
we substitute
Velocity V = 26 m / 0.9 s
Velocity V = 28.889 m/s
We know that Velocity V can also be expressed as;
V = √( T / m )
we make T the subject of formula
V² = T / m
T = mV²
we substitute
T = 0.28 × ( 28.889 )²
T = 233.68 N
Therefore, the tension in the tightrope is 233.68 N
When the applied force is 150 N and the friction is 94 N, what is the motion? A. Accelerated motion b. Decelerated motion c. No motion D. Uniform motion
Answer:
the answer to this question is Accelerated motion
A vector is
In English
Objects that produce their own light are called?
Let's determine what objects that produce their own light are called.
Objects that have the ability of producing their own lights can be said to possess a property called luminosity.
Therefore, the name given to these objects are luminous objects.
Examples of luminous objects are:
• Stars
,• Sun
,• Electric bulb.
,• Burning candle.....
Therefore, objects that produce their own light are called luminous objects.
ANSWER:
Luminous objects.
In the study of personality, what model includes different traits that underlie one’s basic tendencies
In the study of personality, the Five-factor model includes different traits that underlie one’s basic tendencies.
What is the Five-factor model?The Five-factor model is a scientific theory that states traits of the personality of an individual are due to its biology and therefore they respond to adaptations, which are central in the biology field.
In conclusion, in the study of personality, the Five-factor model includes different traits that underlie one’s basic tendencies.
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If two dogs are pulling a bone with force-20Newtons in opposite direction, then the resultant force is
Answer:
Newtons third law of motion: Balanced forces
Every action has a corresponding and opposing response, according to Newton's third law of motion. As a result, forces always work in pairs. Once more, tug-of-war is a prime illustration.
What force in opposite direction follow newton law?The third law of motion by Newton states that equal, but diametrically opposed forces always act in pairs. There is an equal but opposite reaction to every action, to put it another way.
The forces are balanced if the pullers are exerting equal force but going in the opposite direction on either side of the rope. There is hence no motion.
Although equal and opposite in nature, action and reaction forces cannot be balanced since they act on separate things and do not cancel one another out.
Therefore, This means that when you push against a wall, the wall pushes back against you with an equal amount of force.
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