Answer:
c
Explanation:
every other option is a conductor
A 0.0215 m diameter coin rolls up a 20.0 degree inclined plane. The coin starts with an initial angular speed of 55.2 rad/ s and rolls in a straight line without slipping. How much vertical height does it gain before it stops rolling?
Answer:
The coin will reach a vertical height of 0.027 meters before it stops rolling.
Explanation:
Let suppose that coin-ground system is a conservative system and begins at a height of zero. Since the coin is experimenting a general plane motion, which is a combination of translation and rotation. By Principle of Energy Conservation we have the following model:
[tex]K_{T}+K_{R} = U_{g}[/tex] (1)
Where:
[tex]K_{T}[/tex] - Translational kinetic energy at the bottom of the incline, in joules.
[tex]K_{R}[/tex] - Rotational kinetic energy at the bottom of the incline, in joules.
[tex]U_{g}[/tex] - Gravitational potential energy at the top of the incline, in joules.
By definitions of Kinetic and Gravitational Potential Energy we expand (1):
[tex]\frac{1}{2}\cdot I \cdot \omega ^{2} + \frac{1}{2}\cdot m\cdot R^{2}\cdot \omega^{2} = m\cdot g\cdot h[/tex] (2)
Where:
[tex]I[/tex] - Momentum of inertia of the coin, in kilogram-square meters.
[tex]\omega[/tex] - Angular speed, in radians per second.
[tex]R[/tex] - Radius of the coin, in meters.
[tex]m[/tex] - Mass, in kilograms.
[tex]g[/tex] - Gravitational acceleration, in meters per square second.
[tex]h[/tex] - Height reached by the coin, in meters.
The momentum of inertia of the coin is calculated by:
[tex]I = \frac{1}{2}\cdot m\cdot r^{2}[/tex] (3)
Then, we expand and simplify (2):
[tex]\frac{3}{4}\cdot R^{2}\cdot \omega^{2} = g\cdot h[/tex]
[tex]h = \frac{3\cdot R^{2}\cdot \omega^{2}}{4\cdot g}[/tex]
If we know that [tex]R = 0.0108\,m[/tex], [tex]\omega = 55.2\,\frac{rad}{s}[/tex] and [tex]g = 9.807\,\frac{m}{s^{2}}[/tex], then the height reached by the coin is:
[tex]h = 0.027\,m[/tex]
The coin will reach a vertical height of 0.027 meters before it stops rolling.
- When an object is dropped what happens to potential and kinetic energy as it falls?
A. GPE goes up KE goes down
C. GPE goes down, KE goes down
B. GPE goes up. KE goes up
D. GPE goes down, KE does up
PLS HELP
Which statements below are true?
Check all that apply.
A. Distance can be fully described with a magnitude and a unit.
B. If motion starts and stops at the same location, then the
displacement is zero.
C. Displacement measurements must include magnitude, unit, and
direction.
D. Distance is always less than or equal to the magnitude of the
displacement
Answer:
A and C are correct.
Which household item uses radiation in a beneficial way? conventional ovens smoke detectors electric air filters computers and TV sets
Answer:
Smoke detectors
Explanation:
This is because the ionization chamber in smoke detectors uses radiation, a form of heat transfer to detect smoke.
.The NRC allows beneficial use of smoke detectors which is a radioactive material because a smoke detector has the ability to save lives . it's ability to save lives outweighs any health risk from the radiation. The smoke detector use a very minimal amounts of radioactive materials.
Answer: The household item which uses radiation in a beneficial way is the SMOKE DETECTORS
Explanation:
Radiation is a type of energy that has the ability to travel through space and penetrate materials. There are various types of radiation which include alpha, beta and gamma rays. Many uses of radiation help to ensure high quality and safety of our daily lives. A typical example is seen in smoke detectors.
Smoke detectors are devices installed in a building which serves the purpose of detecting smoke which usually is associated with fire and sounding off an alarm. The types of smoke detectors available depends on their mode of action and these include:
--> Ionization smoke detectors: These type of detector are generally more sensitive to flamming fires. They have an in built small amount of RADIOACTIVE material between two electrically charged plates, which ionizes the air and causes current to flow between the plates. When smoke enters the chamber, it disrupts the flow of ions, thus reducing the flow of current and activating the alarm. An isotope of americium which emits alpha particles is used in this type of smoke detectors and it's an example of an alpha radiation.
Therefore, the household item which uses radiation in a beneficial way is the SMOKE DETECTORS.
Which of the following is a subatomic particle?
Particle
Atom
Neutron
Element
Answer: particle and neutron
Explanation:
correct me if i’m wrong :)
If continuous spectrum light from a star passes through a cool, low-density gas on its way to your telescope and spectroscope, ____ spectrum on the continuous spectrum results. If continuous spectrum light from a star passes through a cool, low-density gas on its way to your telescope and spectroscope, ____ spectrum on the continuous spectrum results. a bright (emission) line a dark (absorption) line continuous
Answer:
a dark (absorption) line.
Explanation:
A star is a giant astronomical or celestial object that is comprised of a luminous sphere of plasma, binded together by its own gravitational force.
It is typically made up of two (2) main hot gas, Hydrogen (H) and Helium (He).
Light wave can be defined as an electromagnetic wave that do not require a medium of propagation for it to travel through a vacuum of space where no particles exist.
A telescope can be defined as an optical instrument or device which comprises of a curved mirror and lenses used for viewing distant objects i.e objects that are very far away such as stars and other planetary bodies.
If continuous spectrum light from a star passes through a cool, low-density gas on its way to your telescope and spectroscope, a dark (absorption) line spectrum on the continuous spectrum results, which ultimately implies that the color is being absorbed and the absorption of specific frequencies of light by a hot gas.
When a closed loop of wire experiences a changing magnetic field a voltage and therefore current is produced. This is the basis for...
Answer: The answer is an electric generator
Explanation:
I just took the quiz and I thought it was an electric motor but the correct answer was an electric generator.
This concept of closed loop wire experiences a changing magnetic field and flowing of current is related to the Faraday's law of electromagnetic induction.
Why there is a current flow whenever there is a change in magnetic field in a closed loop of wire?When ever there is a bar magnet inside the wire and the magnet moves relative to the wire there will be an EMF generated in the coil and current can be flown.
similarly by reversing the process if the magnet remains stationary and the coil is moved then again the emf and the current generated in the coil which is called as electromagnetic induction.
This is the basic principle of transformers,generators,motors .
Thus when a closed loop of wire experiences a changing magnetic field a voltage and therefore current is produced.
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Todos los cuerpos pueden estar sobre la tierra por la fuerza de gravedad .Cuando nos caemos ,saltamos y realizamos otras actividades la fuerza de gravedad influye bastante, por lo tanto, esta fuerza la ejerce: a. El centro de la tierra b. Cada una de laas personas c. Las capas que rodean la tierra d. Todas las anteriores
Answer:
a. El centro de la tierra.
Explanation:
Se considera que la gravedad es una fuerza de atracción universal que actúa entre todos los objetos que tienen masa, energía y ocupan espacio. Por lo tanto, actúa de tal manera que une los objetos.
Además, la gravedad de la tierra hace posible que todos los objetos físicos tengan peso.
La ley de Newton de la gravitación universal establece que la fuerza de atracción (gravedad) que actúa entre la Tierra y todos los objetos físicos es directamente proporcional a la masa de la Tierra, directamente proporcional a la masa del objeto físico e inversamente proporcional al cuadrado de la distancia que separa el centro de la Tierra'y ese objeto físico.
Todos los cuerpos pueden estar sobre la tierra por la fuerza de gravedad .Cuando nos caemos ,saltamos y realizamos otras actividades la fuerza de gravedad influye bastante, por lo tanto, esta fuerza la ejerce el centro de la tierra.
If the displacement of a body is proportional to square of time state weather the body is moving with uniform velocity or uniform acceleration?
Answer:
If the displacement of an object is proportional to the square of the time taken then the body is moving with uniformly accelerated motion as it will follow Newton's second equation of motion for a particular initial velocity, which can be given by, s=ut+21at2.
I have an atomic mass of 108. Who am I?
Here is a picture showing how two magnets will stick to one another when opposite poles align. When these magnets are pulled
slightly apart, does the attractive force between them still exist?
A)
Yes, but the new attractive force is due to gravity.
B)
No, since they are not touching, no force is at work.
Yes, even though they are not touching, they are pulling on one another.
D)
No, when the magnets are apart, they exert a repulsive force on one
another
Answer:
A
Explanation:
The others are only when the poles are the same as in south pole and south pole however north pole and south pole do connect cause they are oppisites
You are on the steep edge of the Grand Canyon, which is miles deep. You fire an arrow at an 89-degree angle towards the canyon (nearly straight up, with no hope of reaching the other side) Describe the arrow's trajectory, in particular noting approximately when the arrow has the most deceleration, the most acceleration, and then why the shift begins to happen. Cover all major points in the trajectory from initial shot to final resting place. When is the arrow moving fastest?
Answer:
a. The arrow follows a parabolic path
b. As the arrow hits the ground,
Explanation:
a Describe the arrow's trajectory, in particular noting approximately when the arrow has the most deceleration, the most acceleration, and then why the shift begins to happen. Cover all major points in the trajectory from initial shot to final resting place.
This is because, the arrow is a projectile and its path follows a parabolic curve as it goes from initial shot to final resting place.
Its equation of motion is governed by y = ut - 1/2gt² where y = parabolic path, u = initial speed of arrow, t = time and g = acceleration due to gravity.
As the arrow rises, it undergoes the most deceleration. This is because as it rises, its speed decreases until it gets to the peak of its path, where its velocity is momentarily zero.
Also, as the arrow drops, it undergoes the most acceleration. This is because as it drops from its peak, its speed increases until it gets to the bottom of its path, where its velocity is maximum and given by v = u' - gt where u' = velocity at peak = 0 m/s. So, v = 0 - gt = -gt.
b. When is the arrow moving fastest?
As the arrow hits the ground, its velocity is highest (maximum), so it is fastest at this point.
An airplane is cruising at a speed of 250 m/s. If the airplanes engines provide a forward force of 19,540 N, calculate the force of the air resistance (friction) that is acting on the plane.
If a spring has an elastic potential energy of 60 J and a displacement of 4 m , what is the spring constant of the spring?
Answer:
7.5 N/m
Explanation:
Potential energy of a spring can be calculated using below formula
Potential energy= 1/2kx^2
potential energy = 60 J
X= displacement = 4 m
K= spring constant=?
Substitute the values we have
60= 1/2 × K × 4^2
60= 1/2 × K × 16
60= K × 8
K= 7.5 N/m
Hence, the spring constant of the spring is 7.5 N/m
To increase the solubility of a solid, what should you do to the temperature of the solvent? NEED HELP ASAP
A.Raise the temperature of the solvent
B.Lower the temperature of the solvent
Which statement describes an atomic nucleus? *
1 point
An atomic nucleus is negatively charged.
An atomic nucleus has no electrical charge.
An atomic nucleus consists of mostly empty space.
An atomic nucleus contains most of the atom’s mass
Answer:
An atomic nucleus contains most of the atom’s mass
Explanation:
The first and second answer choices are incorrect because the nucleus has a charge -- but it is positive due to the presence of protons.
The third answer choice is incorrect because the nucleus is extremely dense and packed with all of the protons and neutrons of the atom.
The fourth answer choice is correct because protons and neutrons contain the mass of the atom.
Answer:
An atomic nucleus contains most of the atom’s mass
Explanation:
Hope this helps
Elsa runs 100m. She takes 20s to run this distance. What is Elsa's average speed?
Answer:
Average speed = 5 m/s
Explanation:
Given the following data;
Distance = 100m
Time = 20 secs
To find the average speed;
Speed = distance/time
Substituting into the formula, we have;
Speed = 100/20
Speed = 5m/s
Therefore, Elsa's average speed is 5 meters per seconds.
What is the energy conversion in an incandescent lightbulb?
Answer:
An incandescent bulb use electrical energy
Explanation:
Explain
(0) what is meant by regeneration,
(ii) why an analogue signal cannot be regenerated
Explanation:
1.) Regeneration is the natural process of replacing or restoring damaged or missing cells, tissues, organs, and even entire body parts to full function in plants and animals.2.) When noise is added to analogue signals, it usually sounds like background hiss. Such noise can not be removed so the original clean signal can not be re-created or re-generated.
A pilot wishes to flt his planne to an airport north of his current location
The plane has a speed of 290ms!
(i) How long will it take him to reach the airport if it is
800 Km away?
Answer:
Time = 2758.62 seconds
Explanation:
Given the following data;
Speed = 290 m/s
Distance = 800 km to meters = 800 * 1000 = 800000
To find the time;
Time = distance/speed
Time = 800000/290
Time = 2758.62 seconds
Therefore, it will take the pilot 2758.62 seconds to reach the airport.
• A 1200-kg car is driven through town with a speed of
15 m/s.
What is the magnitude of the car's
momentum?
pls help me to draw it . I will make you brianliest
please answer as fast as possible
a monometer containing mercury of density p = 13.6 x 10^3 connected to a gas supply. caluclate the perssure of the gas supply
also sorry for the blury image
Explanation:
the pressure is given by P=hpg
where h is height,p is density, g is 10m/s²
thus P= 0.05m•13.6x10³•10
P=6.8x10³ Hgmm
What role does the sun play in driving the water cycle in Antarctica
Answer:
the inner regions of antarctica gets only about 2 inches of precipitation per year. the winds here blow up snow from the land and put it into the atmosphere, which is part of the water cycle. and the sun helps out, too, causing sublimation to occur, which causes snow to evaporate directly into water vapor gas.
Explanation:
good luck, hope this helps :)
have a nice day !!
(20 points) What are wispy looking clouds, usually at high altitudes called?
stratus clouds
nimbus clouds
cirrus clouds
cumulus clouds
Answer:
the answer is c cirrus clouds
Explanation:
Explain, step by step, how an electrical current is generated in the electrocytes.
Answer:
Hello your question is quite Vague hence I will provide you with a general knowledge answer
answer :
Place an electrode in an electrolyte solutionApply a voltage source ( Dc voltage )Movement of ions from the cathode to the anode of the electrode will begin The movement of ions brings about Electrical currentExplanation:
Electricity is generated in electrolytes through the following steps :
Place an electrode in an electrolyte solutionApply a voltage source ( Dc voltage )Movement of ions from the cathode to the anode of the electrode will begin The movement of ions brings about Electrical currentIons are electrically charged atoms that are either positive or negative ( i.e. lost or gained an electron )
Please help me fr fr !
Answer:
Explanation:
An object has a kinetic energy of 50 J and a velocity of 5 m/s, what is the mass of the object?
Answer: 4 kg
Explanation:
Ke=1/2MV^2
plug in the kinectic energy and solve for M
50=1/2(M) (5^2)
M= 4
Why are bananas curved?
Answer:
Bananas are curved because they grow towards the sun
Explanation:
Bananas are curved so they can retrieve sunlight. Bananas go through a process called 'negative geotropism'. What it means is that bananas grow away from the ground, instead of growing towards it, hence the 'negative' geotropism.
Answer:
Because they grow towards the sun and the sun is what makes things grow like water to Beneath each flower petal, a row of tiny banana fruits start to grow. Once they're much bigger in size, the fruit goes through a process called negative geotropism. Which basically means instead of continuously grow towards the ground, they start to turn towards the sun, in order to retrieve light.
Explanation:
An air mass that is moving from the north pole toward the equator would be turned to the ? because of the spinning of the earth on its axis
(finish the question by putting in the correct word where the ? is)
Answer:
An air mass that is moving from the north pole toward the equator would be turned to the East because of the spinning of the earth on its axis
Explanation:
An air that is moving from the North pole toward the equator will be turned to the East (right) because of the spinning of the earth around its own axis.
What is the Coriolis effect?The Coriolis Effect can be described as an apparent effect generated by a rotating frame of reference. The effect takes place when an object moving along a straight path can be viewed from a non-fixed frame of reference.
The moving frame of reference is the one in which the Earth rotates at a fixed speed. The Coriolis effect creates wind patterns near the earth’s surface, that move to the east toward the equator and to the west toward the poles. These wind patterns are responsible for moving clouds around the globe and creating weather patterns.
Coriolis force can be described as a fictitious force resulting from the rotational movement of the earth. It only affects the wind direction and not the wind speed. The magnitude of Coriolis force can be calculated from the wind speed.
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