If there is no dark matter in the milky way galaxy, what is the best alternative explanation for the observations?.
Answer:
My own understanding of gravity is not correct for galaxy-size scales.
14) Calculate the magnitude and direction of the magnetic force on a particle of charge q= 13C that
is moving with a velocity of v= -20m/s x (to the left) in a magnetic field of B= 0.5 T 2
The magnitude and direction of the magnetic force on a particle of charge is - 2.21 in the opposite direction.
What is magnetic force?Magnetic force is defined as the electrically charged particles that are in motion and exhibit either attraction or repulsion. The interaction between moving and stationary charged particles is explained by the electromagnetic force, commonly known as the Lorentz force.
The magnitude and direction of the magnetic force can be calculated as
F = q v B sinθ
Given q = 13 C
v = - 20 m/s
B = 0.5 T²
F = 13 C x - 20 m/s x 0.5 T² sinθ
F = - 130 sinθ
Let θ is equal to 1
Then, F = 130 sin1
F = - 130 x 0.017
F = - 2.21
Thus, the magnitude and direction of the magnetic force on a particle of charge is - 2.21 in the opposite direction.
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According to ___ in the nec®, unused knockouts and other openings in electrical boxes and cabinets are required to be closed.
roller coasters are popular attractions at amusement parks. a cart on a roller coaster approaches the highest point on the coaster. as the cart reaches the top, it slows down.
The roller coaster slows down as it ascends yet another hill. Potential energy is created from kinetic energy.
At the top of the loop, what kind of potential energy does the roller coaster have?The energy that an item has due to its height is called gravitational potential energy (PE = mgh), and it is equal to the mass of the object times its height times the gravitational constant. On a roller coaster, the gravitational potential energy is greatest at the top and lowest at the bottom. As the roller coaster speeds down the hill, the potential energy it had while on a slope is transformed into kinetic energy. The roller coaster slows down as it ascends yet another hill. Potential energy is created from kinetic energy.
How is a roller coaster propelled by energy?The roller coaster is propelled by the conversion of potential energy to kinetic energy, and after it has descended the first hill, it has all the kinetic energy it will require for the trip. Once you're moving, various wheel designs contribute to a pleasant ride. The coaster's running wheels direct it along the track.
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1) A net force of 2.5 N is applied to an object with a mass of 16.2g what’s the acceleration?
Answer: To determine the acceleration of an object in response to a net force, you can use the equation a = F/m, where a is the acceleration, F is the net force, and m is the mass of the object. In your case, the net force is 2.5 N and the mass of the object is 16.2 g. Since the units of force are in newtons and the units of mass are in grams, you will need to convert the mass to kilograms before plugging the values into the equation.
One kilogram is equal to 1000 grams, so 16.2 grams is equal to 0.0162 kilograms. Plugging this value into the equation, we get:
a = F/m
a = 2.5 N / 0.0162 kg
a = 154.32 m/s^2
Thus, the acceleration of the object in response to the net force of 2.5 N is 154.32 m/s^2.
Someone in a car going past you at the
speed of 45 m/s drops a small rock from a
height of 2.1 m.
How far from the point of the drop will the
rock hit the ground? The acceleration due to
gravity is 9.8 m/s Answer in units of m.
Answer:
The rock hits the ground 29.25 m far from the point of drop.
Explanation:
We know,
s = ut + 1/2 at²
to find the time taken for the rock to hit the ground, where u is 0 and a = g,
2.1 = 4.9t²
t = 0.65
The horizontal distance covered in this time:
distance = speed x time
d = 45 x 0.65
d = 29.25 m
What is the relationship between the magnetic force and the distance between the magnets?
The strength of the magnetic force is inversely proportional to the square of distance between the magnets. Thus, as the distance increases, force between the magnets decreases.
What is magnetic force?Magnetic force, is the force generated by magnetic flux lines arised from a magnetic field. A magnet have a south pole and north pole. There will be repulsive force between two like poles and attractive force between two unlike pole.
The force between two objects is always in inverse proportion with the distance and this is well explained by Coulomb's law of forces.
Thus, F ∝ 1/r² where, r is the distance.
Therefore, as the distance between two magnets increases the magnetic force between them decreases.
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If you could take an escalator up the stairs instead of walking, how much work would the escalator do compared to your walking up the stairs?
The amount of work required to climb steps or to remain motionless while mounting a moving escalator is the same in both situations, however in the first case, the effort is in pushing the body upward, whereas in the second, it is in pushing the escalator downward.
What is work?In physics, the term "work" refers to the measurement of energy transfer that takes place when an item is moved over a distance by an external force, at least a portion of which is applied in the direction of the displacement.
The length of the path is multiplied by the component of the force acting along the path to calculate work if the force is constant. The work W is theoretically equivalent to the force f times the distance d, or W = fd, to represent this idea. Work is done when a force is applied at an angleα of to a displacement, or W = fd cosα.
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sara, who weighs 69 kg, is on a guilt trip after eating a 838-calorie (838 kcal) breakfast of pancakes loaded with fruits, cream, and syrup. she decides to work out before going to her weekly weight-watchers' meeting. if the height of a single stair is 12 cm, and her body is only 27% efficient in converting chemical energy to mechanical energy, determine the number of stairs sara must climb to cancel out the calories consumed.
The number of stairs Sara must climb to cancel out the calories consumed is 11667 stairs
How do I determine the number of stairs?To obtain the number of stairs Sara much climb, we'll begin by obtained the total height. This can be obtained as follow:
Mass (m) = 69 KgEnergy consumed = 838 Kcal = 838 × 4184 = 3506192 JPercentage conversion = 27%Mechanical energy (E) = 27% × 3506192 = 946671.84 JAcceleration due to gravity (g) = 9.8 m/s² Total Height (h) = ?E = mgh
946671.84 = 69 × 9.8 × h
946671.84 = 676.2 × h
Divide both sides by 676.2
h = 946671.84 / 676.2
h = 1399.99 m
Finally, we shall determine the number of stairs. Details below:
Total height = 1399.99 m = 1399.99 × 100 = 139999 cmHeight of one stair = 12 cm Number of stairs =?Number of stairs = Total height / height of one stair
Number of stairs = 139999 / 12
Number of stairs = 11667 stairs
Thus, the number of stairs is 11667 stairs
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b) if the moon followed the same orbital plane but was twice as far away, would there be solar eclipses?
The Moon's phases would not change, and total solar eclipses would not be conceivable. A 5° angle separates the Moon's orbital plane from the Earth's (ecliptic) orbital plane.
What would happen if the moon was in the same orbital plane as Earth?The Moon could never entirely cover the solar disk if it were any smaller or orbited the Earth any further away. If the Moon were a little bit bigger or orbited the Earth a little bit closer, it would cover much of the sun's corona during totality, making eclipses far less impressive. One orbit of the moon around the Earth is completed in around one month.
There would be at least two eclipses per month if the moon orbited in the same plane as the ecliptic, the Earth's orbital plane. Ides would be far higher.The moon would produce eight times more powerful tidal forces (tides are inversely proportional to the cube of distance). The moon would seem in the night sky four times as brilliant and twice as large.
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look at picture for question
Answer:
third one
Explanation:
x is always the least sum of a calculation as per as the chart it's nb-90
in diamond, by how much, in degrees, do the critical angles for total internal reflection differ for red light compared to violet light?
The critical angles for red and violet light through diamond are 24.5° and 24.0°, respectively.
What is a critical angle, exactly?The incidence on incidence at which the refraction angles equals 90 degrees is known as that of the critical angle. The polarization di incident light and the light beam bends in the direction of normal when it enters a thicker environment from a similarly rarer medium.
An illustration of a critical angle.The critical angle is the angle of impact that provides a 90-degree angle of refraction. Keep in mind that an angle of impact value is how the angle of inclination is defined. For water-air borders and crown glass-water borders, the angle of inclination would be 48.6 degrees and 61.0 degrees, respectively.
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a 60 kg load is located at the very end of a uniform board of length l, which is supported one-quarter of the way from the end and is balanced. what is the mass of the board?
The Mass of the board is also 60kg when a 60 kg load is located at the very end of a uniform board of length l, which is supported one-quarter of the way from the end and is balanced.
What is the Mass of the board ?The Mass of the board is also 60kg because of a 60 kg load is located at the very end of a uniform board of length l which is also balanced and supported by one end.
Given:
Load is located at the very end of a uniform board= 60Kg
length of uniform board = L
Solution:Now to find the mass of the board do as follows;
⇒FN(l/4)-Mg(l/4)-60g(l/4)=0
⇒Mg(1/4)=60g(1/4)
⇒M(mass)=60kg
Hence , the Mass of the board is also 60kg .
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How much heat is removed from 60.0 g of steam at 100.0°C to change it to 60.0 g of water at 20.0°C?
Explanation:
this question we need to find the amount of heat they just removed from 60 g of steam At 100°C. To change too 60 g of water two 20 degrees Celsius. The specific heat of liquid water As 4.184 jewel program degree Celsius specific heat of steam As 1.84 joules per gram degree C. Heat off vaporization of water to is 40.67. Kill a jewel family. First this 60 g of 18 has converted to 60 g of water at 100°C. As the heat removed will be en indu L status and as the number of malls and Elysa heat of vaporization, that is 40.67. Hello Joel palmer so that each one that is the heat removed is equal to 60 indu 40.65 divided by 18. That is the given Mars by Moller mass gives the number of moles. That is by 16 to 40.65 by 18. Such that H one. The heat remote is obtained us 1 35.5 kg jule. Now the water is converted from 100°C to 20 degrees Celsius. The heat at a more can be calculated by mm indu C'e, hindu deity. That is M is the mass. C is the specific heat capacity. That is 4.18 Joule per kilogram and DT is the change in temperature that is 100 minus 20. That is 80°C says that he'd removed H2 is equal to .06 Hindu 4.18. For in due 100 minus 20 obtained us 20 kg jokes. Thus the total heat. Little mood will be H one Plus H two. That is 1 35.5 plus 20 And it has obtained as 155.5 kilo jule.
define from which of Earth's systems are mineral resources obtained?
Sources of mineral resources are most commonly magma, sediments, or hydrothermal fluids.
Examples of mineral resources are iron, diamond, gold, silver, copper, aluminum, granite, marble, clay, salt, rare earths or fossil fuels.
What are mineral resources?
A mineral resource is a concentration of natural solid inorganic or fossilized organic matter, including metals, coal and minerals, in sufficient quantity and quality to have reasonable prospects for economic exploitation. This definition has a broader scope than mineral reserves that are likely to be economically recovered based on consideration of technical, economic, and legal concerns.
Mineral resources means minerals, naturally occurring solid inorganic substances, or naturally occurring solid fossilized organic substances (including base metals, precious metals, coal and industrial minerals), in or on the earth's crust, such Means concentrated or occurring in form and quantity and in its grade or quality. There are reasonable prospects for economic development. The location, quantity, grade, geological features and continuity of Mineral Resources are known, estimated or interpreted on the basis of specific geological evidence and knowledge.
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sound components are identified as coming from the same sound source. this means that the components are
Sound components are identified as coming from the same sound source. this means that the components are generated by the same physical object or process, and they tend to have similar characteristics such as frequency, timbre, and intensity.
What is Sound components about?These components are usually perceived as being part of a single sound or voice, rather than being perceived as separate sounds.
For example, if you are listening to a person speaking, the different sound components that make up their voice, such as their pitch, vowel sounds, and consonant sounds, are all generated by the same source (the person's vocal cords and mouth).
In some cases, sound components can be isolated and analyzed individually. For example, in audio engineering or music production, in order to shape the overall sound of a recording or performance.
Additionally, sound components can be synthesized or manipulated using digital audio software, allowing for the creation of new sounds or the modification of existing ones.
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5-ohm resistor is connected to a 1.5 V battery. The 5-ohm resistor is replaced with a smaller resistor.
In order to keep the current through the resistor the same, what should be done to the voltage of the
battery?
(A) Increase it
(B) Decrease it
(C) Keep it the same
As altitude increases, the air pressure decreases. How do you think the lower pressure will affect the following?.
Answer:
A. Freezing point: Increase.
B. Melting point: Decrease
C. Boiling point: Decrease
Explanation:
As we go up in higher altitudes the air becomes on and less dense, hence the decrease in the water vapor content at such altitude leads to a decrease of boiling point.
Thus the air above is cool and much colder than at the ground surface. The vapor pressure is temperature-dependent and thus the melting point will decrease.
A charge of 3 C flows through a lamp and loses 12 J of electrical energy.
a) What is the potential difference across the lamp?
b) What happens to the 12 J of electrical energy?
Answer: yo your in high bro u need to learn this stuff if you want to past u fell me ? Explanation:
a 250 word formal essay Describe factors that influence one's food choices. Include explanations on how food choices reflect one's culture, ethnic backgrounds, and/or perhaps one's religious beliefs.
In writing an essay you must consider the structure of the essay, Hence, the structure of the essay should be considered;
The Introduction The body'The conclusionWhat are the factors that influence one's food choices?Generally, Individual factors, such as expertise, personal taste choice, emotions, hunger level, health status, special dietary requirements, ethnicity, and personal income, are some examples of these influences that make a contribution to an individual's food choices.
Other examples of these influences that contribute to a person's food choices include outside factors.
A person's religious beliefs may have a significant impact on the kinds of meals they purchase. For instance, individuals who follow the religion of Islam will not consume cattle or lamb that has not been killed using the halal procedure, but those who follow the religion of Jews will only consume items that have been certified as kosher.
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a car starts from rest and goes down a hill with a constant acceleration of 5 m/s2 after 5s the car reaches the bottom of the hill what is the car's final speed
Answer:
25m/s
Explanation:
Velocity Final is equal to velocity initial plus acceleration times time
(Vf=Vi+at)
Vi=0
A=5
T=5
Vf=0+5x5
vf=5x5
Vf=25 m/s
a 2.3 kg box, starting from rest, is pushed up a ramp by a 10 n force parallel to the ramp. the ramp is 2.0 m long and tilted at 17 ∘. the speed of the box at the top of the ramp is 0.80 m/s.
The force exerted on the system produces WD = 20J and K.E = 0.736J of work if a speed of a box that appears of ramp is 0.80 m/s.
What is force in science?At this point, describing a force as pushing or pulling is quite acceptable. There is no such thing as a force how an item "has in it" and "contains." A force is applied to one thing by another. The idea of the a force encompasses both living and non-living things.
Briefing:Mass m = 23kg
Force F = 10N
Length of the ramp = 2m
Velocity V = 0.8m/s
The force's efforts on the system that results in
WF = F × D = 10 × 2.0 = 20 J
The force's efforts on the system that results in, u = 0.
dKE = ½mv² = 0.5 × 2.3 × 0.8 × 0.8
= 0.736 J
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Which statement correctly describes the differences between positive and negative acceleration?
A. Positive acceleration describes a change in speed; negative acceleration describes no change in speed.
B. Positive acceleration describes no change in speed; negative acceleration describes a change in speed.
C. Positive acceleration describes an increase in speed; negative acceleration describes a decrease in speed.
D.Positive acceleration describes a decrease in speed; negative acceleration describes an increase in speed.
Positive acceleration describes an increase in speed; negative acceleration describes a decrease in speed. Hence option C is correct.
What is acceleration?Acceleration is defined as the speed at which an object's velocity changes over time. It is a vector quantity to accelerate. If a point or object travelling straight forward accelerates or decelerates, it is moving faster or slower. The equation a = v/t denotes acceleration (a), which is the change in velocity (v) over the change in time (t).
When the car accelerates positively, its speed rises. As the car slows down, its speed decreases. Negative acceleration occurs when a force causes a body's velocity to decrease. Therefore, the body's negative acceleration can also be referred to as its deceleration.
Thus, positive acceleration describes an increase in speed; negative acceleration describes a decrease in speed. Hence option C is correct.
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A 2400-kg car is moving at 20 m/s when it slams on the brakes and skids to a stop with a leftward acceleration
of 7 m/s/s.
The braking force that caused the car to skid to a stop is given by the equation:
Force = mass * acceleration
Plugging in the values for the mass of the car (2400 kg) and its acceleration (-7 m/s/s), we get:
Force = 2400 kg * (-7 m/s/s)
= -16800 N
This is the force that the brakes had to exert on the car in order to bring it to a stop. This force would have acted in the opposite direction to the car's motion, or to the right in this case.
For a hit in baseball, compare the force exerted by the bat on the ball to the force exerted by the ball on the bat. Why do bats sometimes break ?
Answer:
Bats sometimes break when the ball is hit with too much force, it could cause the ball to crack or even sometimes break the bat itself.
A scientific law is something we can use to make a specific, concrete prediction. For example, the law of gravitation states that masses will attract each other, and you will find that this is always the case. However, it can also be used to make concrete statements about the properties of an object in the right conditions. For example, if a material were found that was not attracted to other objects with masses, we could say that.
A scientific law is something we can use to make a specific, concrete prediction. For example, the law of gravitation states that masses will attract each other, and you will find that this is always the case. However, it can also be used to make concrete statements about the properties of an object in the right conditions. For example, if a material were found that was not attracted to other objects with masses, we could say that the material has no mass (Option B).
What is a scientific law?A scientific law is a well sustained statement or model based on diverse hypotheses that were tested by using the scientific method, which additionally allows us to make predictions about certain questions raised by observing the natural world.
Scientific laws are based on experimentla and observational procedures that can be used to test all statements of the laws and thus also verified in their assumptions.
Therefore, with this data, we can see that scientific law is based on several well sustained assumptions that were tested by using the scientific method and thus conformed to make predictions about certain outcomes
Complete question:
Choose the right option. A scientific law is something we can use to make a specific, concrete prediction. For example, the law of gravitation states that masses will attract each other, and you will find that this is always the case. However, it can also be used to make concrete statements about the properties of an object in the right conditions. For example, if a material were found that was not attracted to other objects with masses, we could say that____
the material is charged.
the material has no mass.
the material must be floating.
the material has very little mass.
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6. In 1874, a swarm of locusts descended on Nebraska. The swarm's mass was estimated to be 25 × 10⁹ kg. If this swarm were split in half and the halves separated by 1.0 × 10³ km, what would the magnitude of the gravitational force between the halves be?
The change in gravitational potential energy stored in 16 Jule.
What is gravitational potential energy?Gravitational potential
In classical mechanics, of the gravitational potential at in a location is equal to the work per unit mass that's would be needed to Move an object to that locations from a fixed references location. It is analogous to the electric potential with the mass playing the role of charge.
Sol-As per the given question ∆PE = mgh
M= skg
g= 4m/s^2
∆h = 2m
∆PE = 2m×4m×2m
= 16 Joules.
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a golf ball of mass 0.050 kg is at rest on the tee and has a velocity of 102 m/s immediately after being struck. if the club and ball were in contact for 0.94 ms what is the average force exerted on the ball?
A golf ball with a mass of 0.050 kg is at rest on the tee and accelerates to 102 m/s as soon as it is struck. The average force applied to the ball if the club and ball made contact for 0.94 ms is 6.3 kN.
Describe impulse.Impulse is a term used to describe how a net force—a specific type of "moving force"—affects an object. An impulsive force is a strong force that acts quickly to cause a finite change in momentum. Impulsive forces were conceptualized separated from regular forces throughout science history.
How is impulse calculated in physics?Force times time equals change in momentum for an impulse.
Briefing:F = mv/t
F = (0.050 kg)(102 m/s) / 0.81 ms × 10⁻³ = 6.3 kN
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consider a wave passing through a single slit. what happens to the width of the central maximum of its diffraction pattern as the slit is made half as wide?
Therefore, if the slit width an is cut in half, the central maximum expands to double its original size.
What do waves in physics mean?A wave is an energetic disruption in a fluid that doesn't include any net particle motion. Elastic deformation, a change in pressure, an electrical or magnetic intensity, an electric potential, or a shift in temperature are a few examples.
A unit of wavelength?The SI system for wavelength is the meter, which is frequently abbreviated as m. Frequency is measured using multiples or subdivision of a meter. Notably, exponential ratios of 10 are employed when widths are a key aspect.
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The complete question is-
Consider a wave passing through a single slit. What happens to the width of the central maximum of its diffraction pattern as the slit is made half as wide?
Its width does not change.
It becomes one-half as wide.
It becomes twice as wide.
It becomes one-fourth as wide.
It becomes four times wider
a wire with mass 40.0 g is stretched so that its ends are tied down at points 80.0 cm apart. the wire vibrates in its fundamental mode with frequency 60.0 hz and with an amplitude at the antinodes of 0.300 cm. (a) what is the speed of propagation of transverse waves in the wire? (b) compute the tension in the wire. (c) find the maximum
The speed of propagation of the transverse wave in the wire is 4800 cm/s. The tension in the wire is 15.71 N and the maximum transverse acceleration is 11,105,600 cm/s².
A transverse wave is a type of wave in which the particles of the medium move in a direction perpendicular to the direction of energy propagation. Examples of transverse waves include light, radio, and other types of electromagnetic waves.
The speed of propagation is the speed at which a signal travels through a medium, such as a wire, fiber optic cable, or radio wave.
(a) Speed of propagation of the transverse wave in the wire =
v = λf
= (80.0 cm) (60.0 Hz)
= 4800 cm/s
b)Tension in the wire = F/A
= m(ω² X A_max) / A
= (40.0 g)(2π² X 60² X 0.300 cm²) / (80.0 cm)²
= 15.71 N
(c) Maximum transverse velocity = A_max X ω
= 0.300 cm X 2π X 60 Hz
= 1842.4 cm/s
Maximum transverse acceleration = A_max X ω²
= 0.300 cm X (2π X 60)²
= 11,105,600 cm/s²
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