Answer:
True
Explanation:
a 4.7-kg solid sphere, made of metal whose density is 4000 kg/m3, hangs by a light cord. when the sphere is immersed in water, what is the tension in the cord? the density of water is 1000 kg/m3.
39.21 NTension in the cord The tension in the cord can be calculated as follows; Mass of sphere = 4.7 kg Density of water = 1000 kg/m³Density of the sphere = 4000 kg/m³Now, the density of the sphere will tell us the volume of the sphere.
The density of the solid sphere is 4000 kg/m³. It weighs 4.7 kg. When the sphere is immersed in water, the tension in the cord can be calculated as follows: So, we have the Volume of sphere = Mass/Density= 4.7/4000= 0.001175 m³The volume of water displaced by the sphere is equal to the volume of the sphere. The volume of water = Volume of sphere = 0.001175 m³Now, let's use the density of water to find the mass of the water that was displaced. The density of water is 1000 kg/m³. So, Mass of water displaced = Density of water × Volume of water= 1000 × 0.001175= 1.175 kgNow we can calculate the weight of the sphere. The weight is equal to the mass of the sphere × the acceleration due to gravity (g). We can assume g to be 9.8 m/s².Weight of sphere = Mass of sphere × g= 4.7 × 9.8= 46.06 NTension in the cord = Weight of sphere - Buoyant force= 46.06 - (mass of water displaced × g)= 46.06 - (1.175 × 9.8)= 39.21 N.
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How do intensity, frequency, and time affect physical fitness?
An Object with a mass o 5.13kg placed on top of a spring compresses it by 0.25m (a) what is the force constant of the spring (b) How high will this object go when the spring releases its energy?
The force constant of the spring is 200.696 N/m & The height the object achieves when the spring releases its energy is 2.5087 m
The spring constant is the force needed to stretch or compress a spring, divided by the compressive or expansive distance. It's used to determine stability or instability in the spring, and therefore the system it's intended for. we know,
F = kx
Therefore,
k = F/x
We also know that the force being exerted on the spring is equal to the mass of the object. Hence, F = mg = 5.13 * 9.8 N = 50.174 N and we know compression due to the mass is 0.25m. Therefore,
K = 50.174/0.25 N/m
K = 200.696 N/m
Therefore, The Spring Constant is 200.696 N/m
On release, the spring potential energy gets converted to kinetic energy. Hence, on release, the height attained by the object is given by:
h = \(1/2 kx^{2}\)
We know that k=200.696 N/m and x=0.25 m. Therefore the height is:
h = \(1/2 (200.696 N/m)(0.25 m)^{2}\)
h = 2.5087 m
Therefore, the force constant of the spring is 200.696 N/m & The height the object achieves when the spring releases its energy is 2.5087 m
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A ball thrown vertically into the air with an initial velocity U; what is the greatest height reached?
The highest height attained is 2gu.
At the highest point, what is the beginning velocity?The vertical velocity is 0 at its highest point. Once more increasing in magnitude as the item descends back toward Earth, the vertical velocity now faces away from the initial vertical velocity.
When a ball is tossed vertically up and allowed to fall in free fall, what is the vertical velocity at the top of the path?0 m/s. Any projectile at its highest point has an instantaneous speed of zero. The time to reach maximum height is equal to the time to arrive at the destination since gravity accelerates the ball by the same amount whether it is moving up or down.
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que es el periodo de un pendulo
Answer:
what
Explanation:
Answer:
El periodo del péndulo simple, para oscilaciones de poca amplitud, viene determinado por la longitud del mismo y la gravedad.
Explanation:
No influye la masa del cuerpo que oscila ni la amplitud de la oscilación. Donde: T: Periodo del péndulo.
5.
A train is moving on a straight track with a speed of 70.0km/h [E]. It slows down at a rate
of 2.00m/s2 [W] in a distance of 35.0m. Determine
a.The final speed of the train. b.How much time the train took to slow down to this speed.
Answer:
t = 1.659s
Explanation:
We can use the kinematics equations to solve this questions:
v = u + at
\(v^{2} = u^{2} +2as\)
where v = Final Velocity, u = initial velocity, a = acceleration, t = time, s = displacement
a) Given information from the question,
u = \(\frac{70km}{h} =\frac{(70*1000)m}{(1*3600)s} = 19.444m/s\) (Convert km/h to m/s first)
a = \(2m/s^{2}\)
s = 35m
Now we can substitute these values into the 2nd kinematics equation to find v, final velocity.
\(v^{2} =(19.444)^{2} +2(2)(35)\\v=\sqrt{(19.444)^{2} +2(2)(35)} \\v= 22.761m/s (5.sf)\\\)
b) Now we have the final velocity, we can substitute the values into the first kinematics equation to find t , the time taken.
v = u + at
22.761 = 19.444 + 2t
2t = 22.761 - 19.444
t =\(\frac{22.761-19.444}{2}\)
t = 1.659s
When can acceleration be observed and what result will it have on an object?
Answer:
Work out the change in velocity for you given time.
Calculate the change in time for the period you are considering.
Divide the change in velocity by the change in time.
can increase the velocity of the object, decrease the velocity of the object, or change the direction of the velocity of the object.
Explanation:
hope this helped have a great day!
A group of students were investigating the force of gravity. They began by dropping a foam ball from a height of 3 meters into a bucket of sand. The ball hit the sand in 0.306 seconds. They dropped additional balls of approximately the same diameter, but of different masses. Here is the data they collected. Based on this experiment and the collected data, what would their conclusion be?
A) Gravitational attraction is dependent on the mass of an object.
B) The greater the mass of the object the greater the acceleration due to gravity and the faster it will fall.
C) Mass does not affect the speed of falling objects assuming there is only the force of gravity acting on the objects.
D) Mass becomes a factor affecting the speed of a falling object when the object is dropped a great distance from the surface of the Earth.
Answer:B
Explanation:
The force of gravitation depends on the mass of the object. As the mass increases, the speed of the falling object also increases because it experience more gravitational pull from earth. Thus, option D is correct.
What is gravitational force?Gravitational force is a kind of force by which an object attracts other objects into its center of mass. We are all standing on the ground because of the gravitational pull of earth.
Gravitational force is directly proportional to the mass of the objects and inversely proportional to the distance from the surface. Therefore, the force exerted by earth on massive body is greater than that on a light body.
Here, the ball with greater mass hit the ground with less time compared to the one with less mass. Hence, the mass becomes a factor affecting the speed of a falling object when the object is dropped a great distance from the surface of the earth. Thus, the massive body will be pulled more by earth.
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Explain what it means when someone says energy can not be created or destroyed.
Answer:
Energy is always reused. Energy cannot be created or destroyed because it always turns into some other type of energy.
Explanation:
What feature means the Earth wire will take current away from the case reducing the chance of accidental electrocution?
A:
A high resistance
B:
A fuse connected to it
C:
A very low resistance
D:
Stops the flow of the current
«
1. Determinar cuanta fuerza es necesaria para empujar un móvil que se encuentra en reposo para que alcance una velocidad de 15 m/s en un tiempo de 20 segundos, considerando que dicho móvil tiene una masa de 1000Kg. No considere que existe fricción.
Responder:
Explicación:
Fuerza = Masa × aceleración
Dado que aceleración = velocidad final - velocidad inicial / tiempo
Fuerza = m (v-u) / t
Dado
Masa = 1000 kg
v = 15 m / s
u = 0 m / s
t = 20 segundos
Sustituye los valores dados en la fórmula para calcular la fuerza.
F = 1000 (15-0) / 20
F = 1000 (15) / 20
F = 15000/20
F = 750N
You are planning to test the water quality at a reservoir at
different depths.
Task 1: Explain the planning that you will do
before you leave for Dam. What are the important aspects you must
consider?
Be sure to adhere to all safety precautions while performing the test, such as wearing protective gear, being cautious of the surroundings, and working in teams.
Ensure that you have obtained the necessary permits and permissions from relevant authorities to test the water at the reservoir. Be sure to adhere to all safety precautions while performing the test, such as wearing protective gear, being cautious of the surroundings, and working in teams.
Before leaving for the dam, planning is essential. It will allow you to test the water quality in a systematic and thorough way. The following are some important aspects that must be considered:
Test Equipment Selection - Choose suitable test equipment to test the water quality at various depths. This equipment must be calibrated, cleaned and checked for accuracy prior to testing. Also, take spare parts or additional equipment just in case something happens.Time and Duration - The testing time and duration should be planned to take into account all factors that may affect the test. This includes the weather, time of day, depth of the water and other environmental factors.
Depending on the location, the test should be done during the same period to ensure consistency.
Transportation - Make sure that the test equipment is safely transported and can be easily moved around the test site. Consider factors like access points, terrain, and the distance from the test site to the base. Make sure you take enough fuel for transportation.
Test Plan - Develop a test plan that outlines the testing procedure, test objectives, testing schedule, and personnel requirements. This plan will be your guide to ensure that the testing is done properly and within a specific time frame.
Record Keeping - During the test, record the data from all the measurements taken. Record-keeping is crucial for future analysis and comparisons. It is also important to have a detailed map of the site to track the exact location of each measurement taken.
Finally, ensure that you have obtained the necessary permits and permissions from relevant authorities to test the water at the reservoir. Be sure to adhere to all safety precautions while performing the test, such as wearing protective gear, being cautious of the surroundings, and working in teams.
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A tennis ball has 10 J of energy when it is 1 m above the floor.
Name the store associated with this
energy.
The store associated with the energy when a ball has 10 J of energy when it is 1 m above the floor is gravitational potential energy
What is gravitational potential energy?
Gravitational potential energy is the energy of a body by virtue of its position in the gravitational field.
From the question, If a tennis ball has 10 J of energy when it is 1 m above the floor, first, a work of 10 J was done against gravity to lift the tennis from the floor to a height of 1 m. At the height of 1 m, the work of 10 J is converted to the gravitational potential energy of the tennis ball which is stored in the ball.
Hence, The energy associated when a tennis ball has 10 J of energy and it is 1 m above the floor is gravitational potential energy.
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A fire hose discharges 2.3 m/min into the atmosphere. The diameter of the hose is 12 cm. A nozzle is bolted to the end of the hose that reduces the cross- sectional area of the flow (Figure 6.78). The diameter of the end of the nozzle is 4 cm. Assume frictionless flow
The hose has a diameter of 12 cm. A nozzle is fastened to the end of the hose, reducing the flow's cross-sectional area. the velocity of the water at the end of the nozzle is 30.5 m/s.
Assuming frictionless flow and incompressible fluid, the mass flow rate of water through the hose is:
\(m_dot = rho * A * V\)
where rho is the density of water, A is the cross-sectional area of the hose, and V is the velocity of water through the hose.
The cross-sectional area of the hose can be calculated using the diameter:
\(A_hose = pi*(d_hose/2)^2 = pi*(0.12/2)^2 = 0.01131 m^2\)
The velocity of water through the hose can be calculated from the discharge rate:
\(V_hose = Q/A_hose = (2.3/60) / 0.01131 = 3.41 m/s\)
where Q is the discharge rate in m³/s
At the end of the nozzle, the cross-sectional area is reduced and the velocity of the water increases due to the principle of continuity. The mass flow rate of water through the nozzle is still the same as that through the hose, so:
\(m_dot = rho * A_nozzle * V_nozzle\)
where A_nozzle is the cross-sectional area of the nozzle and V_nozzle is the velocity of the water through the nozzle.
The cross-sectional area of the nozzle can be calculated using the diameter:
\(A_nozzle = pi*(d_nozzle/2)^2 = pi*(0.04/2)^2 = 0.00126 m^2\)
Using the principle of continuity, the velocity of the water through the nozzle can be calculated:
\(A_hose * V_hose = A_nozzle * V_nozzle\\V_nozzle = (A_hose / A_nozzle) * V_hose = (0.01131 / 0.00126) * 3.41 = 30.5 m/s\)
Therefore, the velocity of the water at the end of the nozzle is 30.5 m/s.
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complete the following sentence, then explain why you wrote what you did. "becoming aware that i am a person living during the anthropocene makes me feel
"Becoming aware that I am a person living during the anthropocene makes me feel concerned about the impact that humans are having on the planet and the future of our species."
I wrote this sentence because the Anthropocene is a term used to describe the current geological age, characterized by human activities having a significant impact on the Earth's ecosystems and geology. The awareness of living in this time period can evoke feelings of concern for the future of the planet and humanity, as the negative consequences of human activities are becoming increasingly evident. "becoming aware that I am a person living during the anthropocene makes me feel concerned about the impact that humans are having on the planet and the future of our species." I wrote this sentence because the Anthropocene is a term used to describe the current geological age.
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A motorcycle stops at a red light and then gains a speed of 12 m/s in 15s. What's its acceleration?
0.8 m/s^2
1.25 m/s^2
-0.8 m/s^2
-1.25 m/s^2
The acceleration of the motorcycle is 0.8 m/s².
Hence, Option a) 0.8 m/s² is the correct answer.
Given the data in the question;
Since the motorcycle stopped
then, initial speed; \(u = 0 m/s\)
final speed; \(v = 12m/s\)
time; \(t = 15s\)
acceleration = ?
To get our acceleration, we use the first equation of motion.
This equation states that;
\(v = u + at\)
so, we simply substitute in our given values and solve for "a"
\((12 m/s) = (0 m/s) + ( a * 15s )\)
\(12 m/s = ( a * 15 s )\)
\(a = \frac{12m/s}{15s}\)
\(a = 0.8 m/s^2\)
Therefore, the acceleration of the motorcycle is 0.8 m/s²
Option a) 0.8 m/s² is the correct answer
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How much force is needed to accelerate a toy car of mass 8kg at 2m/s2?
I need help with this question.
Answer:
16N
Explanation:
ΣF = ma
Fapplied = (8kg)(2m/s^2)
Fapp = 16N
when an astronomer rambles on and on about the luminosity of a star she is studying, she is talking about:
When an astronomer rambles on and on about the luminosity of a star she is studying, she is talking about the amount of energy the star gives off each second.
Luminosity and apparent brightness are about brightness, but from a different point of view. The difference between luminosity and apparent brightness is that luminosity tells us exactly how bright a star really is while apparent brightness only tells us its brightness seen from Earth.
L / Lsun = ( d / dsun )² = b / bsun
L = Luminosity of a star
Lsun = Luminosity of sun
d = Distance of star
dsun = Distance of sun
b = Brightness of star
bsun = Brightness of sun
Therefore, when an astronomer rambles on and on about the luminosity of a star she is studying, she is talking about the amount of energy the star gives off each second.
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When do sea breezes occur
Einstein's theory of general relativity is currently the best explanation of gravity. what is likely to happen to this theory in the future?
a. it will remain the best explanation, because no one has come up with a better one yet.
b. it will remain the best explanation, because einstein's name is so well-known.
c. it will be replaced by a new theory if popular opinion changes.
d. it will be replaced by a new theory if enough evidence is collected.
Answer:
d. it will be replaced by a new theory if enough evidence is collected.
Explanation:
i think
Find the mass in kg, if the energy is 7.81 x10^13
Answer:
sorry
Explanation:
Write the dimensions of a and b in the relation P=(b-x^2)/at where P is power, x is distance and t is time
Answer:
the dimensions of a are T^2/M( that is per M square of T)
the dimensions of b is L^2
note: a minus sign is attached to both dimensions when working
Why is the nail driven into the wood? Explain.
Answer:
The nail is driven into the wood so that it would hold into the wood because if the wood was driven to the nail it may not stay and it would take way to much effort.
Explanation:
While most pitches are encoded directly by the placement of a frequency on the membrane, low-frequency tones are encoded by:
While most pitches are encoded directly by the placement of a frequency on the membrane, low-frequency tones are encoded by the phase-locking of the auditory nerve fibers.
This means that the nerve fibers fire in synchrony with the sound wave and the brain can then interpret this as a low-frequency tone. This is because the membrane's responsiveness decreases at lower frequencies, making it more difficult for it to accurately encode the pitch information.
While most pitches are encoded directly by the placement of a frequency on the membrane, low-frequency tones are encoded by the timing of the membrane's vibrations, also known as phase-locking. This explanation means that low-frequency sounds are represented by the synchronization of the membrane's movements with the incoming sound waves, allowing for accurate encoding of these lower pitches.
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The 70 kg student in figure p14. 43 balances a 1200 kg elephant on a hydraulic lift. What is the diameter of the piston the student is standing on?.
The piston the student is standing on has a 0.22-times larger diameter than the piston the elephant stands on.
What is mechanical advantage of a hydraulic lift?Pascal's law is shown via the hydraulic system.In doing so, we are able to use a modest force on the small piston to generate a bigger force on the huge piston.At each piston, the ratio between the force and the area must be the same.The three practical tools that make use of Pascal's law are hydraulic presses, hydraulic lifts, and hydraulic brakes.Given parameters:
Mass of the student: m = 70 kg.
Mass of the elephant: M = 1200 kg.
Let the diameters of the piston the student is standing on and the piston the elephant is standing on are respectively d and D.
Using Pascal's law , we can write,
Force applied by the student's weight ÷ area of the piston the student is standing on = Force applied by the elephant's weight ÷ area of the piston the elephant is standing on.
⇒ 70 kg × g / π d² = 1200 kg × g / π D²
⇒ 1400 d² = 70 D²
⇒ d= 0.22D.
Hence, The piston the student is standing on has a diameter that is 0.22 times larger than the piston the elephant is standing on.
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True or false? Humans use more water for washing at home than for any other use.
Eye at the lowest radiated power of 1,2 x10 x (- 17) W. Determine how many photons of light with a wavelength of 500nm fall on the retina of the eye every second
Answer:
\(\frac{n}{t} = 30\ photons/s\)
Explanation:
The radiated power can be given in terms of the wavelength as follows:
\(Rasiated\ Power = \frac{nE}{t} = \frac{nhc}{\lambda t}\)
where,
Radiated Power = 1.2 x 10⁻¹⁷ W
n = no. of photons = ?
h = plank's constant = 6.625 x 10⁻³⁴ J.s
c = speed of light = 3 x 10⁸ m/s
λ = wavelength = 500 nm = 5 x 10⁻⁷ m
t = time
Therefore,
\(1.2\ x\ 10^{-17}\ W = \frac{n(6.625\ x\ 10^{-34}\ J.s)(3\ x\ 10^8\ m/s)}{(5\ x\ 10^{-7}\ m)(t) }\\\\\frac{n}{t} = \frac{1.2\ x\ 10^{-17}\ W}{3.975\ x\ 10^{-19}\ J}\\\\\frac{n}{t} = 30\ photons/s\)
what is called gratational force
Answer:
Gravitational force can be seen as the pull that the earth has on an piece of matter. Everything on earth has a force acting on it which is gravity. It tries to pull two object closer to each other but never apart. The numerical value for gravitational force is 9.8 m/s^2 for free falling objects
If a power source provides 54 watts of power to operate a machine that draws 4.5 amps of current when in use, what is the voltage used by the machine?
Answer:
.V=12v
Explanation:
P=VI
54W=V×4.5A
V=54W/4.5A
V=12V
relative to the size of the planet, mercury has the largest core of any planet in the solar system. true false
The statement "Relative to the size of the planet, Mercury has the largest core of any planet in the solar system" is TRUE.
Relative to its size, Mercury has the largest core of any planet in the solar system. Mercury is the smallest planet in our solar system, but it has a relatively large core compared to its overall size. The core of Mercury is composed mostly of iron and is believed to make up about 85% of the planet's radius. This large core is thought to be a result of early differentiation during the planet's formation, where the denser materials sank to the center, leaving a relatively thin mantle and crust.
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