You must raise the weight to a height of 10 meters. You cannot do it! Thinking back to what you have learned in science class, you set up the pulley you see here. How does using this pulley reduce the force needed to lift the weight 10 meters?
Answers
Meanwhile multiple pullies divide the tension. The lower pulley itself reduces the force into half so as to you feel a part of the tension while rest is suspended by the ceiling in the case in the diagram below.
Answer:
C.The amount of force stays the same; the direction changes. You pull down to move something up.
Explanation:
i got it right so trust me. if you dont ur loss
Related Questions
you stretch a spring by a distance of 0.3 m. the spring has a spring constant of 440 n/m. when you release the spring, it snaps back. what is the kinetic energy of the springs as it reaches its natural length?
Answers
Answer:
19.8 J
Explanation:
According to the law of conservation of energy, the total mechanical energy of the spring (sum of kinetic energy and elastic potential energy) must be conserved:
[tex]K_i + U_i = K_f + U_f[/tex] (1)
where we have
[tex]K_i[/tex] is the initial kinetic energy of the spring, which is zero because the spring starts from rest (2)
[tex]U_i[/tex] is the elastic potential energy of the spring when it is fully stretched
[tex]K_f[/tex] is the kinetic energy of the spring when it reaches the natural length
[tex]U_f[/tex] is the elastic potential energy of the spring when it reaches its natural length, which is zero because the stretch in this case is zero (3)
So
[tex]U_i = \frac{1}{2}k(\Delta x_i)^2[/tex]
where
k = 440 N/m is the spring constant
[tex]\Delta x_i = 0.3 m[/tex] is the initial stretching of the spring
Substituting,
[tex]U_i = \frac{1}{2}(440)(0.3)^2=19.8 J[/tex]
And so using eq.(1) and keeping in mind (2) and (3) we find
[tex]K_f= U_i = 19.8 J[/tex]
A patient needs surgery to open a clogged heart artery. This patient should look for a surgeon who is an expert in which of the following?
Answers
The answer is B i know this because
superficial anatomy of the circulatory system
functional anatomy of the circulatory system
superficial anatomy of the nervous system
functional anatomy of the nervous system
its not a nervous system part so there goes the last two and superfical means from the outside of the body like skin and hair and the reproductive like testicals and and the ovarys stuff like that thus leaves your answer with the only logical one {functional anatomy of the circularory system}.
Which is a narrow band of high winds located near the top of the troposphere? a sea breeze a jet stream polar easterly a trade wind?
Answers
Answer:
jet streams
Explanation:
I know the anwser
Red cabbage juice can be used as an acid-base indicator. When a solution is highly acidic, the juice turns red. As the acidity decreases and the solution becomes basic, the color changes from red to violet to green to yellow. Red cabbage juice is used as an indicator of some common household products. Which product will turn yellow when cabbage juice is added? A) coffee B) ammonia C) vinegar D) bottled water
Answers
Answer:
B) Ammonia
Explanation:
Red cabbage juice is an acid-base indicator. It turns red for acidic medium and as the pH increase it turns to violet, green and then yellow.
It means for a basic solution, it would turn yellow. From the given options, coffee and vinegar are acidic. Therefore, they would turn red. Bottled water is neutral. Ammonia is a weak base. It would the indicator yellow.
Find the total translational kinetic energy of 1.5 l of oxygen gas held at a temperature of 0°c and a pressure of 0.8 atm.
Answers
[tex]pV=nRT[/tex]
where
p is the gas pressure
V is its volume
n is the number of moles
R is the gas constant
T is the absolute temperature
However, this equation can be also rewritten as
[tex]PV= \frac{2}{3}NK [/tex] (1)
where
N is the number of molecules in the gas, and K is the average kinetic energy of the molecules. Therefore, NK represents the total kinetic translational energy of the gas.
For the gas in our problem,
[tex]p=0.8 atm = 8.08 \cdot 10^4 Pa[/tex]
[tex]V=1.5 L =1.5 \cdot 10^{-3} m^3[/tex]
So, the total translational kinetic energy of the gas is (using eq.(1) )
[tex]NK= \frac{3}{2}pV= \frac{3}{2}(8.08 \cdot 10^4 Pa)(1.5 \cdot 10^{-3} m^3)=181.8 J [/tex]
To calculate the total translational kinetic energy of 1.5 liters of oxygen gas at 0°C and 0.8 atm, use the ideal gas law to find the number of moles and then apply the translational kinetic energy equation (KEtrans = (3/2)nRT).
Explanation:To find the total translational kinetic energy (KEtrans) of 1.5 liters of oxygen gas at 0°C (273 K) and 0.8 atm, we can use the ideal gas law and the equipartition theorem. The ideal gas law PV = nRT can give us the number of moles of oxygen gas when rearranged to n = PV/RT. Here, P is the pressure, V is the volume, R is the ideal gas constant, and T is the temperature.
Once the moles (n) are calculated, the translational kinetic energy per mole of a gas can be found using the equation KEtrans = (3/2)nRT, where n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin. By substituting the values into the equation, we can find the total translational kinetic energy of the gas sample.
What aspects of bone’s structure make it stronger than concrete? think about the engineering design of bone. use the terms tensile strength and compressional strength in your answer?
Answers
Bone's structure is optimized for strength due to its complex arrangement of organic and inorganic materials.
Tensile strength is a key factor: collagen fibres in bone resist pulling forces, making it flexible yet tough.
Compressional strength is achieved through the dense arrangement of mineralized hydroxyapatite crystals, providing resistance against crushing loads.
This combination of tensile and compressional strength allows bone to withstand bending, twisting, and impact. In contrast, concrete primarily relies on compressional strength, making it brittle and prone to fracture under tension.
Bone's intricate structure, with collagen providing flexibility and hydroxyapatite providing rigidity, makes it significantly stronger and more resilient than concrete in various mechanical scenarios.
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Bones have a higher tensile and compressional strength than concrete due to their composite structure of collagen fibers and mineralized matrix, along with a complex microarchitecture designed to adapt to mechanical stresses. These aspects make bones robust and efficient weight-bearing structures.
The aspects of bone's structure that make it stronger than concrete are related to its complex microarchitecture and composite nature, which enable it to have a high tensile strength and compressional strength. Bones are formed from collagen, much like the steel rebar in concrete, and a mineralized matrix rich in calcium, which bears similarity to the concrete itself. However, the collagen provides flexibility and tensile strength, while the inorganic salts provide compressional strength, making bones robust and capable of adapting to mechanical stresses.
The ultimate strength of human bones, particularly in the femur, is impressive, with an ultimate compressive strength of 205 MPa and an ultimate tensile strength of 135 MPa. This strength is a result of bones being weight-bearing structures, designed to carry loads much like the columns in a building or fibrous structures like trees. The engineering design of bones takes into account different stresses on different parts of the body, which is why the structure of the femur can vary from thin sheets separated by marrow to cylindrical shapes filled with or without marrow.
The elastic modulus of bone also varies based on whether it is under tension or compression, highlighting the bone's capability to withstand different directional forces. Such properties make bones incredibly efficient at carrying weight and resisting different types of stresses without fracturing under normal circumstances.
Determine the pressure exerted by 2.50 mol of gas in a 2.92 l container at 32 oc.
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Solution:
we can solve the problem by using the ideal gas law, which states:
[tex]pV=nRT[/tex]
where
p is the gas pressure
V its volume
n the number of moles
R the gas constant
T the absolute temperature
Before using this equation, we have to convert the temperature in Kelvin:
[tex]T=32^{\circ}C+273 = 305 K[/tex]
and the volume in [tex]m^3[/tex]:
[tex]V=2.92 L= 2.92 dm^3 = 2.92 \cdot 10^{-3} m^3[/tex]
So now we can re-arrange the ideal gas equation to find the pressure exerted by the gas, p:
[tex]p= \frac{nRT}{V}= \frac{(2.50 mol)(8.31 J/mol K)(305 K)}{2.92 \cdot 10^{-3} m^3}= 2.17 \cdot 10^7 Pa[/tex]
Zero on the celsius scale is also known as absolute zero true or false
Answers
0°C = 273.15°K
Zero on the Celsius scale is not known as absolute zero. - False
Explanation:Zero on the Celsius scale is not known as absolute zero. Absolute zero is the lowest temperature that can theoretically exist, and it is equal to -273.15 degrees Celsius or -459.67 degrees Fahrenheit. Zero degrees Celsius is simply the freezing point of water. At this point, all molecular motion and energy cease, and no heat remains in matter.
It is a fundamental concept in thermodynamics and the basis for the Kelvin temperature scale. Achieving absolute zero is impossible in practice, but scientists have come close, allowing the study of quantum phenomena and materials at extremely low temperatures, leading to breakthroughs in physics and technology.
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If a 100N weight sits in an express elevator what will be the weight when the elevator is traveling at a constant speed
Answers
If the elevator is traveling at constant speed, it means it is at rest. This means anything inside the elevator traveling at constant speed, weights the same as in an elevator not moving -also at rest-.
So the 100N weight's weight doesn't change in an elevator traveling at constant speed.
The weight of the 100N weight will remain the same when the elevator is travelling at a constant speed.
Explanation:When the elevator is travelling at a constant speed, the weight of the 100N weight will remain the same. The weight of an object is the force exerted on it due to gravity, and this force does not change regardless of the elevator's speed or direction. So, the weight of the object will still be 100N.
which statement best describes Gay-Lassac’s law
Answers
P1 P2
— = —
T1 T2
where P1 and T1 represent the pressure and temperature before the change, and P2 and T2 represent the pressure and temperature after.
Gay-Lussac's law states that the pressure of a given amount of gas is directly proportional to its temperature on the Kelvin scale, provided the volume is constant. This was initially discovered by Guillaume Amontons and later refined by Joseph Louis Gay-Lussac. The mathematical representation is P proportional to T, P = constant × T or P = kx T.
Explanation:The best description of Gay-Lussac's law is that it states that the pressure of a given amount of gas is directly proportional to its temperature on the Kelvin scale when the volume is held constant. Guillaume Amontons was the first to empirically establish this relationship between pressure and temperature of a gas around 1700, and Joseph Louis Gay-Lussac defined the relationship more accurately around 1800. This relationship is expressed mathematically as PxT or P = constant × T or P = kx T.
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Which of the following best describes alternating current? current that increases and decreases in temperature current that constantly turns on and off current in which charges change direction current that gains and loses electrons
Answers
Answer: Charge that jiggles back and forth very quickly.
Explanation: Alternating current is an electric current that peroidically reverses direction .
A P E X
The following best describes alternating current, Charge that jiggles back and forth very quickly.
What increases or decreases alternating current?A transformer is a machine that either boosts or reduce the voltage of alternating current.
Step-up transformer rises the voltage of alternating current whereas step-down transformer reduces the voltage of alternating current.
Thus, Alternating current is an electric current that peroidically reverses direction.
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How far the Electromagnetics effects be found
Answers
The electromagnetic effect has no limits but it decreases inversely with square distance.
E.M.F = k/d²
where k is the constant of proportionality and d is the distance from the source of electromagnetic field.
To be topologically equivalent which deformation is not allowed
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The slope of a Velocity versus Time graph will tell you the object’s what?
A) Acceleration
B) Change in position
C) Velocity
Thanks
Answers
My name is Charlie.
Today this question is about science,or chemistry.
A. Acceleration is a correct answer. Acceleration is a rate of change in velocity.
It change in velocity/change in time. Next, to slope will be indicated by the acceleration.
B Change in position is a incorrect answer.
C. Velocity is a incorrect answer. Velocity is a displacement of an object during a specific unit of time. It can used two measurements are needed to determine velocity. It displacement or by the time. Displacement it includes a direction, so the velocity will also includes a direction. It can used speed with direction. Velocity it can be average velocity or an instantaneous velocity.
-Charlie
Have a great day!
Thanks!
Without the skeletal system, the body could not fight off infection. Please select the best answer from the choices provided. T F
Answers
Answer:
TRUE
Explanation:
got it right on edge 2022.
The statement Without the skeletal system, the body could not fight off infection is false.
The skeletal system provides support, protection, and movement for the body, and it also plays a role in the production of blood cells through bone marrow. However, the primary function of fighting off infections is carried out by the immune system, which includes the lymphatic system, the spleen, the thymus, and bone marrow, among other components. While bone marrow is part of the skeletal system and is crucial for producing immune cells, the skeletal system itself is not the sole or primary defense against infection. Therefore, the statement is incorrect because it overstates the role of the skeletal system in immune function. The immune system, not the skeletal system, is specialized to fight off infections
A 0.500-kg glider, attached to the end of an ideal spring with force constant undergoes shm with an amplitude of 0.040 m. compute (a) the maximum speed of the glider; (b) the speed of the glider when it is at (c) the magnitude of the maximum acceleration of the glider; (d) the acceleration of the glider at (e) the
Answers
"with force constant k=450N/m"
a) the maximum speed of the glider
The total mechanical energy of the mass-spring system is constant, and it is given by the sum of the potential and kinetic energy:
[tex]E=U+K= \frac{1}{2}kx^2 + \frac{1}{2} mv^2[/tex]
where
k is the spring constant
x is the displacement of the glider with respect to the spring equilibrium position
m is the glider mass
v is the speed of the glider at position x
When the glider crosses the equilibrium position, x=0 and the potential energy is zero, so the mechanical energy is just kinetic energy and the speed of the glider is maximum:
[tex]E=K_{max} = \frac{1}{2}mv_{max}^2 [/tex]
Vice-versa, when the glider is at maximum displacement (x=A, where A is the amplitude of the motion), its speed is zero (v=0), therefore the kinetic energy is zero and the mechanical energy is just potential energy:
[tex]E=U_{max}= \frac{1}{2}k A^2 [/tex]
Since the mechanical energy must be conserved, we can write
[tex] \frac{1}{2}mv_{max}^2 = \frac{1}{2}kA^2 [/tex]
from which we find the maximum speed
[tex]v_{max}= \sqrt{ \frac{kA^2}{m} }= \sqrt{ \frac{(450 N/m)(0.040 m)^2}{0.500 kg} }= 1.2 m/s[/tex]
b) the speed of the glider when it is at x= -0.015m
We can still use the conservation of energy to solve this part.
The total mechanical energy is:
[tex]E=K_{max}= \frac{1}{2}mv_{max}^2= 0.36 J[/tex]
At x=-0.015 m, there are both potential and kinetic energy. The potential energy is
[tex]U= \frac{1}{2}kx^2 = \frac{1}{2}(450 N/m)(-0.015 m)^2=0.05 J [/tex]
And since
[tex]E=U+K[/tex]
we find the kinetic energy when the glider is at this position:
[tex]K=E-U=0.36 J - 0.05 J = 0.31 J[/tex]
And then we can find the corresponding velocity:
[tex]K= \frac{1}{2}mv^2 [/tex]
[tex]v= \sqrt{ \frac{2K}{m} }= \sqrt{ \frac{2 \cdot 0.31 J}{0.500 kg} }=1.11 m/s [/tex]
c) the magnitude of the maximum acceleration of the glider;
For a simple harmonic motion, the magnitude of the maximum acceleration is given by
[tex]a_{max} = \omega^2 A[/tex]
where [tex]\omega= \sqrt{ \frac{k}{m} } [/tex] is the angular frequency, and A is the amplitude.
The angular frequency is:
[tex]\omega = \sqrt{ \frac{450 N/m}{0.500 kg} }=30 rad/s [/tex]
and so the maximum acceleration is
[tex]a_{max} = \omega^2 A = (30 rad/s)^2 (0.040 m) =36 m/s^2[/tex]
d) the acceleration of the glider at x= -0.015m
For a simple harmonic motion, the acceleration is given by
[tex]a(t)=\omega^2 x(t)[/tex]
where x(t) is the position of the mass-spring system. If we substitute x(t)=-0.015 m, we find
[tex]a=(30 rad/s)^2 (-0.015 m)=-13.5 m/s^2[/tex]
e) the total mechanical energy of the glider at any point in its motion.
we have already calculated it at point b), and it is given by
[tex]E=K_{max}= \frac{1}{2}mv_{max}^2= 0.36 J[/tex]
To compute the maximum speed, use the equation vmax = Aω. At x = 0, the speed is 0. The maximum acceleration is given by amax = Aω².
Explanation:To compute the maximum speed of the glider, we can use the equation vmax = Aω, where A is the amplitude (0.040 m) and ω is the angular frequency. The angular frequency is given by ω = √(k/m), where k is the force constant (N/m) and m is the mass (kg). In this case, k = 80 N/m and m = 0.500 kg.
For part (b), the speed of the glider when it is at x = 0 (the equilibrium position) is 0. This is because the velocity is at a maximum when the glider passes through the equilibrium position, and at that point, it changes direction.
The maximum acceleration of the glider can be found using the equation amax = Aω². The magnitude of the maximum acceleration occurs at the position x = -A, so we can substitute -A for x in the equation. Finally, the acceleration of the glider at x = -A can be found by substituting this value into the equation a = -Aω².
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What causes the northern and southern halves of the planet to experience winter and summer at opposite times?
Answers
((((Psychology))))According to Rubin, the desire to share your innermost thoughts and feelings is:
A. attachment.
B. caring.
C. intimacy.
D. all of the above.
Answers
c. intimacy
Hope this helps.
How does electromagnetic induction happen?
Answers
The ideal mechanical advantage of a machine is 3.2 and its output distance is 2.5 meters. What is the input distance?
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What would you need to know to calculate the angular momentum of a man on a Ferris wheel?
Answers
[tex]L=mvr[/tex]
where m is the object's mass, v is its tangential speed, and r is its distance from the axis of rotation.
In case of a man on a Ferris wheel, we need to have these quantities in order to calculate his angular momentum. These quantities corresponds to:
- m, the mass of the man
- v, the tangential speed of the wheel at its edge
- r, the radius of the wheel
It is possible to calculate the angular momentum even if we don't know v, the tangential speed. In this case, we need to know at least the angular velocity [tex]\omega[/tex] (because from this relationship we can find the tangential speed: [tex]v=\omega r[/tex]) or the period of rotation of the wheel, T (because we can find the angular velocity from it: [tex]\omega= \frac{2 \pi}{T} [/tex]).
To calculate the angular momentum of a man on a Ferris wheel you need to know the mass distribution, radius, initial and final angular velocity, and angular acceleration of the system.
Angular momentum of a man on a Ferris wheel can be calculated using the formula:
Angular momentum = Moment of inertia x Angular velocity
To calculate this, you would need to know the mass distribution, radius, initial and final angular velocity, and angular acceleration of the system.
Which would most likely cause molten rock material to become glassy igneous rock?
Answers
Two people push on the same door from opposite sides as shown they will only see the door move when
Answers
Answer: C.
Explanation: The only way that they will be able to see the door move is if only ONE of them exert more force than the other.
You can see that when they both exert the same force on the door, the forces are balanced, and cancel eachother out.
Hope this helped.
Have a nice day. :)
Which type of mirror causes light rays to refract away from each other?
Answers
A convex mirror could cause parallel rays to REFLECT away from each other.
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List the following events in the order that they happen as a sound wave is generated and transmitted through the air.
1. The object's energy transfers to the surrounding air particles.
2. Something causes an object to vibrate.
3. Vibrating air particles bump into other air particles.
4. Air particles around the object begin to vibrate.
5. Energy transfers outward from air particle to air particle.
Answers
Answer: The order is 2,1,5,4,3
Explanation: Hope This helps.
The order in which events occur in the generation and transmission of a sound wave begins with an object vibrating, which transfers energy to air particles, leading to the vibration of surrounding air and the eventual transfer of energy from particle to particle, forming a sound wave.
Sound is produced and travels through a medium via a series of events that can be listed in sequential order:
Something causes an object to vibrate.
The object's energy transfers to the surrounding air particles.
Air particles around the object begin to vibrate.
Vibrating air particles bump into other air particles.
Energy transfers outward from air particle to air particle.
For example, when a tuning fork is struck, its tines vibrate and cause air molecules nearby to oscillate. These vibrations propagate outward as successive air molecules collide, similar to ripples in water when a stone is thrown. This movement of air molecules forms a sound wave, which can be detected by the ear as changes in air pressure and interpreted as sound.
When the amount of a radioactive substance is reduced by 50%, what has occurred? a half-life beta radiation alpha radiation gamma radiation?
Answers
A radioactive material is the heavy nucleus material. When the amount of a radioactive substance is reduced by 50%, a half life has occurred.
What is half life?In radioactivity, the time interval required for one-half of the atomic nuclei of a radioactive sample to decay .
The time interval required for the number of disintegrations per second of a radioactive material or 50% decomposed is equal to the half life of that material.
Thus, when the amount of a radioactive substance is reduced by 50%, a half life has occurred.
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If an astronaut throws an object in space, the object’s speed will _____
Answers
In fact, after the astronaut throws the object, no additional forces will act on it (since the object is in free space). According to Newton's second law:
[tex]\sum F=ma[/tex]
where the first term is the resultant of the forces acting on the body, m is the mass of the object and a its acceleration, we see that if no forces act on the object, then the acceleration is zero. Therefore, the acceleration of the object is zero, and its velocity remains constant.
Put these events of a chain reaction in order from first to last. Many atoms fission. Neutrons are produced. An atom fissions. Neutrons find other atoms.
Answers
1) An atom fission
2) Neutrons are produced
3) Neutrons find other atoms
4) Many atoms fission
This is the description of a fission chain reaction: initially, the reaction starts with the fission of an atom with unstable nucleus. In the fission, neutrons are produced, and they travel through the surrounding medium. Eventually, they meet other atoms and they are captured by their nuclei: the nuclei become unstable and they undergo fission as well.
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Scientist tested the effect of a fertilizer on the growth of plants. They had two sets of plants Group A which gets fertilizer water & and Group B which gets only water and sun (but equal amounts to Group A)
1. Explain how this scenario is a controlled experiment and identify the manipulated variable?
2. If the scientist only performed one experiment but it supported their hypothesis why can it not be considered a theory?
Answers
ANSWER 2: In order for it to be a theory, it has to be tested numerous times by multiple scientists.
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1_i don't know for sure
A force of 50 pounds is directed 30 from the horizontal, find the vector that represents this force.