Gravity is an ___________________________ force that pulls objects together.
Answer: Equal force
Explanation:
Two pith balls hang side by side close to each other without touching as shown in the figure below. They are both neutral to begin with.
a.A plastic rod is rubbed with wool. Describe as negative, positive or neutral the total (net) charge of a system consisting of the rod and the cloth. Explain your reasoning.
b.A student touches sphere A briefly with the rod and then removes it. Then he brings the rod close to sphere A but does not touch it. What will happen to A? Explain your reasoning.
c.What is the charge state of the system consisting of the rod and wool now? Explain your reasoning.
d.Now sphere B is brought very close to A but does not touch it. What will happen to the spheres? Explain your reasoning.
e.Now the student touches sphere B with the same charged rod as above. What will happen to spheres A and B afterwards? Again, the spheres are close to each other but do not touch. Explain your reasoning.
f.What is the charge state of the system consisting of the rod and both spheres? Explain your reasoning.
g.Sphere B is now discharged. Then it is touched by a glass rod that was rubbed with silk. Now both spheres are brought close to each other. What will happen to the spheres now? Explain your reasoning.
h.Both spheres are now moved a bit further apart. What will happen to them now? Explain your reasoning.
a)
When a plastic rod is rubbed with wool, charging by friction occurs.
This is one of the three mechanisms of charging an object: in this particular case, as the rod is rubbed with the wool, electrons jump from the wool to the rod.
As a result, the plastic rod will remain with an excess of electrons (negative charge), while the wool will remain with a lack of electrons (positive charge).
However, the number of electrons gained by the rod is equal to the number of electrons given off by the wool: therefore, the total net charge of the system rod + cloth has not changed.
b)
When the rod touches sphere A, some electrons are transferred from the rod to the sphere (this method of charging is called charging by conduction).
Then, the sphere A will also remain negatively charged, as well as the plastic rod.
Later, the rod is brought close to sphere A without touching it: here, the electrons in the rod repel the electrons in the sphere (like charges repel each other), so the rod and the sphere will repel each other.
c)
Before part b), the negative charge on the plastic rod was equal to the positive charge on the wool.
After part b), the plastic rod has given off part of its electrons to sphere A. As a result, the negative charge on the plastic rod will be now less than the positive charge on the wool.
Therefore, the net charge of the rod + wool system will now be positive.
d)
The electrostatic force between two charged object is:
- Attractive if the charges on the objects have opposite sign
- Repulsive if the charges on the objects have same sign
Since sphere A is charged negatively, when it is brought close to sphere B, the electrons in sphere B will be attracted on the opposite side relative to sphere A, while the positive charges will migrate close to sphere A. Therefore, the two spheres will attract each other, since opposite charges attract each other.
e)
When the plastic rod (which is negatively charged) touches sphere B, some electrons are transferred to sphere B (charging by induction). As a result, charge B will also be negatively charged now, as it has an excess of electrons.
At the same time, sphere A is also negatively charged. Therefore, as like charges repel each other, this means that the two spheres will now repel each other.
f)
The net charge of the rod and the two spheres is negative.
In fact, the electrons given off by the rod to the two spheres were initially on the rod itself: this means that the total net charge of the rod + 2 spheres is equal to the net charge on the rod before the process.
Since the net charge on the rod before the process was negative, then the net charge of the system consisting of the rod + 2 spheres must be negative as well.
g)
When a glass rod is rubbed with silk, charging by friction occurs, similar to part a). However in this case, the glass rod gives off electrons to the silk: therefore, the glass rod remains positively charged.
Later, the glass rod touches sphere B: as a result, positive charge is transferred from the rod to sphere B, so sphere B will remain positively charged.
In the meantime, sphere A is negatively charged: since opposite charges attract each other, this means that now sphere A and sphere B will attract each other.
h)
When the two spheres are moved a bit further apart, the attractive force between them decreases a bit. In fact, the electrostatic force between two charged objects is given by
[tex]F=k\frac{q_1 q_2}{r^2}[/tex]
where
k is the Coulomb's constant
q1, q2 are the charges on the two objects
r is the separation between the objects
As we can see, the force is inversely proportional to the square of the distance: therefore, if the separation between the spheres increases, the force will decrease.
A student is studying a type of wave. Which question will help the student determine if it is an electromagnetic wave?
A
Is it a seismic wave?
B
Is it a sound wave?
C
Is it a water wave?
D
Is it a light wave?
Answer:
A. seismic wave
Explanation:
Because a seismic wave is an elastic wave in the earth produced by an earthquake. And a electromagnetic wave is vibrations between an electric field and a magnetic field.
A student is studying a type of wave. Is it a light wave?, This question will help the student determine if it is an electromagnetic wave.
What is Visible light ?Visible light spectrum is nothing but the range of wavelength of radiation from 4000 angstrom to 7000 angstrom(Violet to Red). light is a energy packet. Every Photon having different wavelength travels with same velocity c (velocity of light). When we focus numbers of colors from visible spectrum to a point, that point appears as a white light. hence white light is composed of numbers of Colors in it.
When we pass white light through a prism, as white light enters in the prism all the colors having different wavelength travels with different velocity in the prism due to that there is separation of colors from the white light. Therefore we get different colors of white light in the prism this phenomenon is know as dispersion of light.
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What does hydroelectric power do?
A) releases carbon dioxide into the air
B) causes thermal pollution
C)requires building dams that can harm ecosystems
D)uses the energy inside an atom's nucleus to generate electricity
Answer: D
Explanation:
Answer:
D)uses the energy inside an atom's nucleus to generate electricity
Explanation:
it was on my reading passage
Which of the following is a good step in learning how to manage time?
A.
listing all the things that you do in your spare time
B.
making a list of your favorite activities
C.
determining how you use your time in a 24-hour period
D.
deciding which activities require the most time to complete
Please select the best answer from the choices provided.
A
B
C
D
Answer:
Answer is C
Explanation:
Brainliest please I really need it
How many paths do the electrons have to flowlin a series circuit?
1) What happens to the energy carried in the transverse wave as the
amplitude increases? *
Answer:
energy increases, frequency increases
Explanation:
As the amplitude of a wave increases, so does the energy it carries, with the energy of a wave being proportional to the square of its amplitude. This relationship is true for various types of waves, including electromagnetic, mechanical, and sound waves. Doubling the amplitude of a wave results in a fourfold increase in its energy, highlighting a quadratic relationship.
What happens to the energy carried in the transverse wave as the amplitude increases? As the amplitude of a wave increases, the energy carried by the wave also increases. This principle applies to various types of waves, including sound waves, water waves, and electromagnetic waves. The relationship between a wave's energy and its amplitude is quadratic; meaning that if the amplitude of a wave is doubled, the energy it carries increases by a factor of four. This is because the energy of a wave is proportional to the square of its amplitude (E² or B²).
For instance, with electromagnetic waves, increasing the amplitude of the electric field (E) and magnetic field (B) results in a significant increase in both the energy density and the energy flux of the wave. This principle is also observed in mechanical waves, such as those on a guitar string or in the air as sound waves, where the amplitude of the wave is related to physical quantities like pressure.
The fact that the intensity of a wave increases fourfold with a doubling of amplitude might seem to challenge the conservation of energy. However, there's no violation occurring; rather, it's an inherent characteristic of wave behavior, allowing for greater energy transmission with increased amplitude.
read each scenario below. Then select the answer that best completes each sentence. The power from a car engine is blank The power of a bicycle because a car engine does the same amount of work in blank time.
Answer:
more than
less
Explanation:
The power of a car engine is far more than the power of a bicycle because a car engine does the same amount of work in less time.
What is Power?Energy transfer or conversion rate expressed in terms of power. The watt, which is equal to one joule per second in the SI Units, is the unit of power. Power may also be referred to as activity in earlier writings. A scalar concept is power.
Power is correlated with other factors; for instance, the gripping force on the tires and the vehicle's velocity are the product to determine the power required to move a ground vehicle. A motor's output power is calculated as the sum of the torque it produces and the angular speed of its output shaft.
As we know that the car and other vehicles are powered by machines but on the other side bicycles, carts, etc. are operated by human force, so the power of car engine is more than bicycle, and it does the same work in less time as compared to bicycle.
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Galileo's discovery shows that, to an observer on Earth, Venus has phases just like Earth's moon. How did this observation provide support for the heliocentric model of the solar system?
Galileo's discovery shows that, to an observer on Earth, Venus has phases just like Earth's moon. This observation provide support for the heliocentric model of the solar system as follows:
Galileo noticed the Moon is not flat, but rocky and rugged-just like the Earth did. He used his telescope to observe the Venus phases. Galileo's findings confirmed his confidence in the concept of Copernicus that Earth and remaining planets revolve around the Sun, i.e. Heliocentrism.While most individuals in Galileo's days assumed that the Earth was the center of the universe and that the Sun and planets revolved around it, i.e. geocentrism.The idea of geocentric was generally preferred by the prominent and strong Catholic Church, and when Galileo started writing papers on his belief in a heliocentric with a valid explanation, he was called to Rome to face the inquisition's charges towards him.Thus in early 1616 he was accused of being a heretic, but later he cleared of charges of "heresy" with warning that he should not spread his belief.But he pursued his astronomy research, and was increasingly confident that all planets revolved around the Sun. Therefore he published a book in 1632 which explained that Copernicus' heliocentric theory was appropriate.Thus after this finally he was charged by "heresy" and sentenced to life imprisonment in 1633, but due to his poor health he lived imprisonment under house arrest and finally died on January 8, 1642.Galileo's observation that Venus has phases supported the heliocentric model because this could only occur if Venus was orbiting the Sun, as predicted by the heliocentric model. The observation contradicted the geocentric model, which predicted that Venus would always appear in the same phase.
Explanation:Galileo's observation that Venus has phases like the Moon was crucial in supporting a heliocentric model of the solar system. In the heliocentric model, the Earth and other planets revolve around the Sun. If this model was correct, Venus should show different phases as it moves around the Sun, similar to our Moon's phases as viewed from Earth. Conversely, in a geocentric model, where Earth is at the center of the universe, Venus would always be seen in the same phase, which was contrary to Galileo's observations. Therefore, Galileo's findings gave strong support to the heliocentric model, further solidifying the theory which is accepted as fact today.
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How do you calculate the total resistance of a series circuit
The total resistance of a series circuit is obtained by summing all the individual resistance of the cricuit.
Total resistance of series circuitThe total resistance of a series circuit is obtained by summing all the individual resistance of the cricuit.
In series circuit, the current flowing in each circuit element is the same across the circuit.
V(t) = IR₁ + IR₂ + IR₃ + ----
V(t) = I(R₁ + R₂ + R₃)
Thus, the total resistance of a series circuit is obtained by summing all the individual resistance of the cricuit.
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a bicycle and a truck are both moving at 10mph, explain which one has more momentum.
Answer:
The truck has more momentum
Explanation:
The truck has more momentum as its mass is heavier than the bicycle.
To calculate momentum the formula is
P=mv
If the mass is greater then the momentum will increase assuming the velocity is the same
Light always follows one and the same path traveling back and forth. If a flashlight has a light bulb placed exactly in the focal point of its convex lens, it will produce a beam of..
A. converging light rays
B. diverging light rays
C. parallel light rays
Final answer:
When a light bulb filament is at the focal point of a convex lens, parallel light rays emerge. The convex lens refracts the light so that rays diverge within the lens and exit parallel, creating a focused beam used in devices like flashlights.
Explanation:
When a light bulb filament is placed at the focal point of a convex lens, the light rays that emerge from the other side are parallel light rays. This effect is due to the properties of convex lenses and their interaction with light. In a convex lens, parallel rays of light are refracted in such a way that they converge at the lens's focal point. Conversely, when a light source is placed at that focal point, the rays diverge within the lens, but then leave the lens parallel to each other. This phenomenon is utilized in various devices such as flashlights, lighthouses, and traffic lights to create a focused and directional beam of light. Option C
The science behind this involves the law of refraction, which dictates that light changes direction when it passes through materials of different densities, like air and glass. In the case of the convex lens, the curvature of the lens and its refractive properties cause the light rays from the focal point to exit parallel. This design ensures that the output beam spreads minimally, providing a strong, directional source of light.
What do we call the substances that are formed as a result of substances reacting together?
Group of answer choices
A)none of the answers are correct
B)catalysts
C)products
D)reactants
calculate the average speed of a car of it traveled 180km in 2.0hr
Answer:
1500m/s
Explanation:
d=180000
t=120
units have to be converted into SI Units
Average Speed = (Total distance)/(Total Time)
Average Speed= (180000)/(120)
Troy pushes on a car for 7 seconds, during which he applies an impulse of
2000 kg•m/s. What force does he apply to the car?
Answer:
F=I/Δt
F=2000/7
F=285.7 N
Explanation:
Final answer:
Explanation:
The student is asking a physics question related to the concept of impulse and force. Impulse, represented by the product of force and time, is equivalent to the change in momentum of an object. The question involves calculating the force applied by Troy when he pushes on a car for 7 seconds, with a given impulse of 2000 kg·m/s.
To find the force applied, we use the formula for impulse: impulse = force × time. Thus, force can be calculated by dividing the impulse by the time over which the force is applied. Given that the impulse is 2000 kg·m/s and the time is 7 seconds, the force applied by Troy can be calculated as:
Force = Impulse / Time = 2000 kg·m/s / 7 s = 285.71 N
Therefore, the force Troy applies to the car is 285.71 Newtons.
pp ez gg reee bee 15 17 19 21
Answer:
I have no clues what this means.....
Explanation:
I would be glad to help if you actually put a question.
Answer:
15 17 19 21 23 25 27 29 31 33 35 37 39 41
Explanation:
The location(s) an electron can occupy around the nucleus depends on the electron's ____________.
A.energy
B.volume
C.mass
The location an electron can occupy around the nucleus depends on the electron's energy or the energy level in which it is present.
What is an energy level?Electrons present in an atom revolve in different orbits which are stationary states and are also called as energy levels. The energy levels are numbered as integers which are also called as principal quantum numbers.
Energy of the stationary state is given as E= -R
1/n² where R
is the Rydberg's constant. When an electron is excited, and it moves from lower to higher energy levels there is absorption of energy, while when it moves from higher energy level to lower energy level it radiates or gives out energy in the form of radiation.
They can also be defined as the distances between electron and nucleus of an atom . Electrons present in K energy level have least energy .Energy level diagrams are studied to understand nature of bonding , placement of electrons in orbits and and elemental behavior under certain conditions.
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Final answer:
The location an electron can occupy around the nucleus depends on its energy. Electrons are described as occupying regions of space called orbitals, and these orbitals are determined by the electron's energy. The energy levels of the orbitals are primarily determined by the principal quantum number and the electrostatic potential produced by the nucleus and other electrons.
Explanation:
The location an electron can occupy around the nucleus depends on the electron's energy. In the current model of the atom, electrons are described as occupying regions of space called orbitals, which are determined by their energies. The energy levels of the orbitals are primarily determined by the principal quantum number and the electrostatic potential produced by the nucleus and other electrons.
Objects 1 and 2 attract each other with a electrostatic force of 18.0 units. If the distance separating Objects 1 and 2 is changed to one-third the original value, then the new electrostatic force will be _____ units.
The new electrostatic force will be 9 times greater than the original force.
Explanation:Coulomb's law, a fundamental principle in electrostatics, describes the relationship between the force F between two point charges q₁ and q₂ separated by a distance r. It states that F is directly proportional to the product of the charges and inversely proportional to the square of the distance, mathematically expressed as F = k * (q₁ * q₂) / r², where k is the electrostatic constant.
According to Coulomb's law, the electrostatic force between two charged objects is inversely proportional to the square of the distance between them. If the distance between Objects 1 and 2 is changed to one-third the original value, the new electrostatic force will be 9 times greater than the original force.
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It is determined that a certain light wave has a wavelength of 3.012 ×10−12 m. The light travels at 2.99 ×108 m/s. What is the frequency of the light wave? (Round your answer to three significant figures.)
Answer:
[tex]f=9.9269\,\,10^{19} Hz[/tex]
Explanation:
Recall that the velocity (v) of a light wave is defined as the product of its frequency (f) times its wavelength ([tex]\lambda[/tex]) :
[tex]v=f*\lambda[/tex]
therefore, we can solve for the unknown frequency by dividing both sides of the equation by the frequency:
[tex]v=f*\lambda\\2.99\,\,10^{8} \frac{m}{s} = f *\,3.012\,\,10^{-12}\, m\\\frac{2.99\,\,10^8}{3.012\,\,10^{-12}} \frac{1}{s}=f\\ f=0.99269\,\,10^{20}\,\, \frac{1}{s}\\[/tex]
Since the units "1/second" are what we call Hertz (Hz), the answer can also be given as:
[tex]f=9.9269\,\,10^{19} Hz\,[/tex]
Answer:
f=9.93 × 1019 Hz
Explanation:
Use the relationship f=vλ to solve for frequency f. Substituting the known quantities yields:
f=vλf=2.99 × 108 m/s3.012 × 10-12 mf=9.926×1019
answer rounded off to 3 significant digits is
f=9.93 × 1019 Hz
Which of the following items are affected the most by the force of gravity?
A. A tennis ball
B. A golf ball
C. A baseball
D. A bowling ball
Answer:
Explanation:
I would say all of them are affected by gravity- everything on the planet of earth is affected by gravity it pushes everything back down, however, if I had to make a guess I would say baseball because there is more gravity applied to the force of the ball than there is used in any other game listed.
Answer:
The bowlingball because it is the heavest which will cause it to fall faster thus showing it is the most affected by gravity.
Explanation:
Spaceship 1 and Spaceship 2 have equal masses of 300 kg. They collide. Spaceship 1's final speed is 2 m/s, and Spaceship 2's final speed 1 m/s in the same direction. What is their combined momentum?
A. 600 kg-m/s
B. 900 kg-m/s
C. 1,200 kg-m/s
D. 3 m/s
The diagram shows a heating curve for a substance. Which segment shows the substance changing from a gas to a liquid?
X-Y
Y-X
W-X
X-W
Answer:
Y-X
Explanation:
Answer:
B
Explanation:
This type of wave behavior causes white to disperse into different colors when shun through a prism like the one picture above. *
4 points
Reflection
Refraction
Diffraction
Scattering
Answer:
Refraction
Explanation:
Refraction is a phenomenon typical of light waves. It occurs when a ray of light passes through the interface between two mediums: when doing so, the ray of light changes speed and also changes direction, according to Snell's Law:
[tex]n_1 sin \theta_1 = n_2 sin \theta_2[/tex]
where
[tex]n_1, n_2[/tex] are the index of refraction of the first and second medium, respectively
[tex]\theta_1, \theta_2[/tex] are the angle of incidence and refraction, respectively
When white light enters a prism, therefore, it undergoes refraction, and it changes direction.
However, the index of refraction of a material, n, depends also on the wavelength of the light. In particular, the shorter the wavelength, the higher the index of refraction.
This means that as white light enters a prism, the different wavelengths contained in the white light are refracted at different angles: as a result, the 7 colors of light will separate, and that is why we observe the rainbow when white light enters a prism.
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Three runners are jogging from North Augusta to Beech Island. Runner 1 runs 14 miles in 3 hours while Runner 2 runs 16 miles in 4 hours. Runner 3 runs 15 miles in 6 hours. What is the average speed of each runner? Then, get the average speed of all the runners together (total distance/total time)
Explanation:
Given that,
Runner 1 runs 14 miles in 3 hours. His average speed is given by :
[tex]v_1=\dfrac{14\ miles}{3\ h}=4.67\ mph[/tex]
Runner 2 runs 16 miles in 4 hours. His average speed is given by :
[tex]v_2=\dfrac{16\ miles}{4\ h}=4\ mph[/tex]
Runner 3 runs 15 miles in 6 hours. His average speed is given by :
[tex]v_3=\dfrac{15\ miles}{6\ h}=2.5\ mph[/tex]
Total distance covered by all three runners, D = 14 + 16 +15 = 45 miles
Total time taken, t = 3 + 4 + 6 = 13 hours
The average speed of all the runners together is given by :
[tex]V=\dfrac{45\ miles}{13\ h}\\\\V=3.46\ mph[/tex]
Hence, this is the required solution.
2. How much work does it take to accelerate a 6.6 kg object from rest to 22 m/s?
O a) 73 J
b) 960 J
c) 1600J
d) 3200 J
e) 0.30 J
Answer:
c) 1600 J
Explanation:
Work = change in energy
W = ½ mv²
W = ½ (6.6 kg) (22 m/s)²
W = 1600 J
The work done to accelerate a 6.6 kg object from rest to 22 m/s is calculated using the work-energy principle and is approximately 1600 Joules.
The student is asking how much work is required to accelerate a 6.6 kg object from rest to 22 m/s. To solve this, we can use the work-energy principle, which states that the work done on an object is equal to the change in kinetic energy. The equation for kinetic energy (K) is K = (1/2)mv², where m is mass and v is velocity.
First, calculate the initial kinetic energy at rest, which would be zero, since the velocity is zero. Next, calculate the final kinetic energy using the formula with the given mass (6.6 kg) and final velocity (22 m/s).
K = (1/2)(6.6 kg)(22 m/s)² = (1/2)(6.6 kg)(484 m²/s²) = 1587.6 J. Therefore, the work done to accelerate the object is approximately 1600 J, matching option (c).
do you think that the universe has a starting point and ending point? explain.
Answer:
No
Explanation:
I don't think the universe has a starting and ending point because the universe is vast and has not been fully discovered. I think that the universe is endless because all of the stars, planets, and galaxy's have yet to be found and the end or start of the universe is also yet to be discovered so I think that the universe could go on forever.
The universe's starting point is believed to be the Big Bang about 13.8 billion years ago, but whether it has an ending point is still unknown.
Explanation:The question of whether the universe has a starting point and ending point is a topic explored in the field of physics. According to the Big Bang theory, the universe began with a singularity approximately 13.8 billion years ago. However, it is currently unknown whether the universe will have an ending point.
One theory suggests that the universe will continue expanding forever, gradually growing colder and darker. Another theory proposes the possibility of a Big Crunch, where the universe would eventually collapse in on itself. Some scientists also speculate about the possibility of a cyclical universe, where the cycle of expansion and contraction repeats indefinitely.
It's important to note that these theories are still being studied and researched, and our understanding of the universe's origins and potential ending is continually evolving.
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Which has more potential
energy; a person waiting for
the roller coaster to go down
the hill or a your binder on your
desk?
A. person in roller coaster
B. binder on desk
I need help ASAP 30 points
Answer:
A. person in roller coaster
Explanation:
If the light ray hits a mirror at a 40° angle (above picture), what angle will the ray of light be reflected? *
4 points
140°
40°
50°
90°
Answer:
40 degrees
Explanation:
The angle is reflected at the same degree.
A leaf electroscope is a device that indicates the existence of electric charge on an object. The leaves spread apart when an object is brought near or touches the electroscope. What observation would suggest that the object touched the electroscope?
Answer: the leaves remainined apart after the charged was removed
Explanation:
2.Mike's car, which has a mass of 1,000.0 kg, is out of gas. Mike is trying to push the car to
a gas station, and he makes the car go 0.05 m/s/s. Using Newton's Second Law, you can
compute how much force Mike is applying to the car.
Answer:
Newton's second law of motion is F = ma, or force is equal to mass times acceleration. Learn how to use the formula to calculate acceleration.
Explanation: