According to Newton's third law, for every action, there is an equal and opposite reaction. Therefore, the door exerts a force on the person that is equal in magnitude but opposite in direction to the force the person exerts on the door.
Using the equation F = ma, where F is force, m is mass, and a is acceleration, we can calculate the force exerted by the door on the person.
F = ma
F = 4.0 kg x 12 m/s²
F = 48 N
Therefore, the magnitude of the force exerted by the door on the person is 48 Newtons.
Hi! To find the magnitude of the force exerted by the door on the person, we can use Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction.
Your question: A person kicks a 4.0-kilogram door with a 48-newton force causing the door to accelerate at 12 meters per second². What is the magnitude of the force exerted by the door on the person?
Step 1: Identify the force exerted by the person on the door (given in the question) which is 48 newtons.
Step 2: Apply Newton's Third Law of Motion. Since the person is exerting a 48-newton force on the door, the door exerts an equal and opposite force on the person.
So, the magnitude of the force exerted by the door on the person is also 48 newtons.
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At what speed does ketchup exit the iconic heinz ketchup glass bottle?. 028 mph.
The average speed at which ketchup exits the Heinz ketchup glass bottle is approximately 0.028 m/s.
The viscosity of ketchup is high, which makes it difficult to flow out of the bottle. A study conducted by researchers at MIT found that the average speed at which ketchup exits the bottle is around 0.028 m/s.
This is slower than other liquids, such as water or oil, due to the complex structure of ketchup and the way its particles interact with each other.
The study also found that tapping the bottom of the bottle can help to speed up the flow of ketchup by breaking up the structure and allowing it to flow more freely.
The complete question is:
What is the average speed of the iconic Heinz ketchup as it exits the glass bottle?
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for a wheel spinning on an axis through its center, the ratio of ther adial acceleartion of a point on the rim to the raidal accleaiton of a point halfway between the center and the rim is
The ratio of the radial acceleration of a point on the rim to the radial acceleration of a point halfway between the center and the rim for a wheel spinning on an axis through its center is 2:1.
When a wheel is spinning on an axis through its center, all points on the wheel have the same angular velocity. However, the linear speed of a point on the rim is greater than the linear speed of a point halfway between the center and the rim.
This means that the radial acceleration of a point on the rim is greater than the radial acceleration of a point halfway between the center and the rim.
Using the formula for radial acceleration, a = rω², where a is radial acceleration, r is the radius of the point from the axis of rotation, and ω is angular velocity,
Therefore, the ratio of the radial acceleration of a point on the rim to the radial acceleration of a point halfway between the center and the rim is 2:1.
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For any circuit the number of independent equations containing emf's, resistances, and currents equals: A.the number of junctions B.the number of junctions minus 1 C.the number of branches D.the number of branches minus 1 E.the number of closed loops
The correct answer is D. The number of independent equations containing emf's, resistances, and currents is equal to the number of branches minus 1.
What is resistances?Resistance is the ability of an object to resist the flow of an electrical current when a potential difference is applied. It is measured in ohms and is represented by the symbol Ω. Resistance is the opposition to the flow of electrons through a conductor, and it is the property of a material that determines the amount of current that can be passed through it for a given voltage. Resistance is an important component in electrical circuits, as it helps to regulate the flow of electricity and prevent damage from overheating.
This is because the sum of the currents at each junction is equal to zero, so one equation can be eliminated from the system.
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A charged particle is projected into a region of uniform, parallel, ® and 4 fields. The force on the particle is: A.zero B.at some angle < 90° with the field lines C.along the field lines D.perpendicular to the field lines E.unknown (need to know the sign of the charge)
The force on the particle is: Unknown (need to know the sign of the charge).
What is force?Force is a physical interaction that is capable of changing the motion of an object. It is a vector quantity, meaning it has both magnitude and direction. There are four fundamental forces in nature: gravitational, electromagnetic, strong nuclear and weak nuclear forces. Gravity is the force that attracts objects to one another and is the force responsible for keeping planets in orbit around the sun. Electromagnetic force is responsible for the interactions between charged particles, such as electrons and protons.
The force on a charged particle in an electric field is given by F = qE, where q is the charge of the particle and E is the electric field. Since the sign of the charge is not known, the force on the particle can not be determined.
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an object much more massive than jupiter, but too small to support thermonuclear fusion is called a
An object much more massive than Jupiter, but too small to support thermonuclear fusion is called a brown dwarf.
Brown dwarfs are often referred to as failed stars because they are too small to sustain the fusion reactions that occur in the cores of true stars.
They are typically between 13 and 80 times the mass of Jupiter and can emit some heat and light from residual energy left over from their formation, but they are not able to sustain the fusion of hydrogen into helium like a true star. Instead, they slowly cool over time, eventually becoming difficult to detect with telescopes.
Hence, An object much more massive than Jupiter, but too small to support thermonuclear fusion is called a brown dwarf.
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if you added another light (resistor) to your circuit, what would happen to the equivalent resistance?
The equivalent resistance of the circuit would increase if another resistor is added in series and decrease if added in parallel.
When a resistor is added in series, the current flowing through the circuit remains constant, but the potential difference across each resistor increases. As a result, the total resistance of the circuit increases, leading to a decrease in the current.
On the other hand, when a resistor is added in parallel, the potential difference across each resistor remains constant, but the current flowing through the circuit increases. This results in a decrease in the total resistance of the circuit. Therefore, the equivalent resistance of the circuit depends on the arrangement of the resistors, and adding another resistor would affect the overall resistance of the circuit.
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FILL IN THE BLANK. A current is said to exist whenever _____.
a. a wire is charged
b. a battery is present
c. electric charges are unbalanced
d. electric charges move in a loop
A current is said to exist whenever electric charges move in a loop
What are electric charges?
When the number of protons in the nucleus is different from the number of electrons around that nucleus, an electrical charge is created in the atom of matter. A negative charge is present in an atom if there are more electrons than protons. A positive charge is present in an atom if there are more protons than electrons.
Powering lamps or other electrical devices always involves creating a loop in which electrical current flows. The circuit is referred to as an electric one. A circuit is made up of various parts that are wired together. The battery or another power source moves the circuit's current.
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If you weigh 100 pounds, are traveling at 30 mph, and hit a stationary object, the force of impact is 3000 pounds (mass multiplied by acceleration).T/F
The force of the impact equals 3000 pounds if you strike a stationary object while moving at 30 mph and weighing 100 pounds (mass times acceleration). This statement is false.
Weight is a measure of the force with which an object is pulled towards the center of the Earth due to gravity. It is proportional to an object's mass, but it also depends on the gravitational field strength at a particular location. In contrast, mass is a measure of the amount of matter in an object and is a fundamental property of an object that does not change with location.
The force of impact that results from a collision is determined by the object's mass and velocity. When an object is in motion, it possesses kinetic energy, which is given by the formula [tex]$KE = \frac{1}{2}mv^2$[/tex], where m is the mass of the object and v is its velocity. When the moving object collides with a stationary one, the kinetic energy is transferred to the stationary object, causing it to deform or break apart. The force of impact is the product of the time over which the collision occurs and the rate at which momentum is transferred, which is given by the formula F = Δp/Δt, where Δp is the change in momentum and Δt is the time interval over which it occurs.
Therefore, the force of impact in a collision depends on the mass, velocity, and time of collision, and cannot be determined solely from an object's weight. In the example given, the force of impact would depend on the mass of the object, its velocity at the time of the collision, and the time interval over which the collision occurred. It is not correct to assume that the force of impact would be 3000 pounds simply because the object weighs 100 pounds and is traveling at 30 mph.
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Two charged objects have a repulsive force of 0.080 N. If the distance separating the objects is halved, then what is the new force?
The force between two charged objects is inversely proportional to the square of the distance separating them. This means that if the distance is halved, the force will increase four times. Therefore, the new force will be 0.320 N.
What is force?Force is an influence that causes a change in the motion, direction, or shape of an object. It is the result of an interaction between two objects, and can be attractive or repulsive. Forces can be categorized as contact forces, such as a push or pull, or non-contact forces, such as gravity. Force is measured in Newtons (N), and is the product of mass multiplied by acceleration. Forces cause acceleration, and the magnitude of acceleration is directly proportional to the magnitude of the force. Forces can act in different directions, and the sum of all forces acting on an object is known as the net force. The law of inertia states that an object in motion will stay in motion until a force acts to change its direction or speed. Force is a crucial concept in physics, and is an important part of understanding how the world works.
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TRUE or FALSE: An object that is electrically neutral contains only neutrons. (static electricity)
An object that is electrically neutral contains equal amounts of positive and negative charges. Neutrons do not carry electrical charge: False.
What is Neutrons?Neutrons are subatomic particles which are found in the nucleus of an atom. They are neutral particles, meaning they do not have a positive or negative charge, and they have a mass slightly larger than that of a proton. Neutrons are an essential part of an atom, as they are what holds the protons together and keep them from repelling each other due to their positive charges. In addition, they also play a role in nuclear reactions such as nuclear fission and fusion. Neutrons are also important in other areas, such as medical imaging and nuclear energy production.
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FILL IN THE BLANK. A common physics lab involves the study of the oscillations of a pendulum. If a pendulum makes 33 complete back-and-forth cycles of vibration in 11 seconds, then its period is ______.
The period of a pendulum refers to the time required for one complete cycle or swing. In the case of a simple pendulum, the period is dependent upon the length of the pendulum and the acceleration due to gravity. Specifically, the period of a simple pendulum is given by the equation:
T = 2π√(L/g)
where T is the period (in seconds), L is the length of the pendulum (in meters), and g is the acceleration due to gravity (in meters per second squared).
In the given problem, we are told that the pendulum makes 33 complete back-and-forth cycles of vibration in 11 seconds. Therefore, we can calculate the period of the pendulum using the equation:
T = (time elapsed) / (number of cycles)
T = 11 s / 33
T = 0.333 s
So the period of the pendulum is 0.333 seconds (or approximately 1/3 of a second).
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a string with a tension of 400.0n hits a 3rd harmonic with a frequency of 300hz. if the string has a length of 40.0cm, then what is the mass of the vibrating portion of the string?
The mass of the vibrating portion of the string is 0.000028. In this scenario, we have a string with a tension of 400.0 N and a 3rd harmonic with a frequency of 300 Hz. The length of the string is 40.0 cm. To find the mass of the vibrating portion of the string, we can use the formula:
frequency = (n/2L) * sqrt(tension/mass)
where n is the harmonic number, L is the length of the string, tension is the tension in the string, and mass is the mass of the vibrating portion of the string.
Rearranging the formula, we get:
mass = tension / ((n/2L)^2 * (frequency^2))
Substituting the given values, we get:
mass = 400.0 N / ((3/2*0.4)^2 * (300 Hz)^2) = 0.000028 Ns^2/m
Therefore, the mass of the vibrating portion of the string is 0.000028 Ns^2/m. This calculation shows how tension and frequency are important factors in determining the mass of a vibrating string.
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Ultrasound is the name given to frequencies above the human range of hearing, which is about 20000 hz. Waves above this frequency can be used to penetrate the body and to produce images by reflecting from surfaces. In a typical ultrasound scan, the waves travel with a speed of 1500 m/s. For a good detailed image, the wavelength should be no more than 1. 0 mm.
The frequency of the ultrasound waves needed for a good detailed image is 1.5 MHz.
In the solution involving frequency, speed, and wavelength in the context of ultrasound. Ultrasound refers to sound waves with frequencies above the human range of hearing, which is about 20,000 Hz.
These high-frequency waves can penetrate the body and produce images by reflecting off internal structures.
In a typical ultrasound scan, the speed of the sound waves is 1500 m/s. To obtain a detailed image, the wavelength should be no more than 1.0 mm. To calculate the frequency of these ultrasound waves, you can use the formula:
Frequency (f) = Speed (v) / Wavelength (λ)Here, the speed (v) is 1500 m/s and the wavelength (λ) is 1.0 mm or 0.001 m.
Plugging these values into the formula: Frequency (f) = 1500 m/s / 0.001 m
Frequency (f) = 1,500,000 Hz or 1.5 MHzSo, the frequency of the ultrasound waves needed for a good detailed image is 1.5 MHz .
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Is it possible to calculate the torque acting on a rigid object without specifying an axis of rotation?.
It is not possible to calculate the torque acting on a rigid object without specifying an axis of rotation.
Torque is defined as the product of the force and the perpendicular distance from the axis of rotation to the point where the force is applied. Without knowing the axis of rotation, it is impossible to determine the perpendicular distance and thus the torque.
Thus, specifying the axis of rotation is crucial in calculating the torque acting on a rigid object.
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No, it is not possible to calculate the torque acting on a rigid object without specifying an axis of rotation.
What is Rotation?
Rotation is a physical motion in which an object or a system of objects spins or turns around an axis. It is a type of circular motion in which every point on the object or system follows a circular path around the axis of rotation.
Torque is defined as the cross product of the force and the lever arm, which is a vector quantity that is dependent on the axis of rotation. Therefore, without specifying the axis of rotation, torque cannot be calculated.
In summary, the axis of rotation is a crucial parameter for calculating torque, and its absence prevents the calculation of torque on a rigid object.
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what is the net magnification, mnet of the two-lens system? be certain to include the sign that is consistent with the standard conventions.\
The magnification can be calculated by dividing the two lenses' combined focal lengths.
What is the lens system's magnification?
The height of an image divided by the height of an object is known as the magnification of a lens. Additionally, it is provided in terms of object and image distance. It is equivalent to the proportion of object distance to image distance.
The ratio of the height of the formed image to the height of the item is used to define the magnification created by the mirror. The overall magnification of a microscope is calculated by multiplying the objective lens's magnification by the optical lens' magnification.
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The AM radio stations can be heard over greater distances because frequencies between 530 and 1600 MHz are partially reflected off the layers of the atmosphere. True or false?
False. The frequencies used by AM radio station are actually between 530 and 1700 kHz, which is significantly lower than the frequency range mentioned in the question.
These frequencies are not reflected off the layers of the atmosphere, but rather they follow the curvature of the earth's surface. This is why AM radio signals can be received over greater distances than FM radio signals, which operate on higher frequencies and travel in straight lines. In addition, AM radio signals can be affected by various factors such as atmospheric conditions, electrical interference, and the presence of obstacles such as buildings and mountains. However, advancements in technology have led to the development of techniques such as directional antennas and signal processing to improve the quality and reliability of AM radio transmissions. Overall, while the frequency range and transmission characteristics of AM radio stations may differ from those of FM radio stations, both types of radio remain important forms of communication and entertainment.
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a proton with an initial speed of 800,000 m/s is brought to rest by an electric field. a. did the proton move into a region of higher potential or lower potential?
When a proton with an initial speed of 800,000 m/s is brought to rest by an electric field, we can conclude that the proton moved into a region of lower potential.
Potential difference is defined as the difference in electrical potential energy between two points in an electric field. When a proton moves through an electric field,
it experiences a change in potential energy. If the proton moves from a region of higher potential to a region of lower potential, it loses potential energy and gains kinetic energy,
which results in an increase in speed. On the other hand, if the proton moves from a region of lower potential to a region of higher potential, it gains potential energy and loses kinetic energy, which results in a decrease in speed.
In this case, the proton with an initial speed of 800,000 m/s is brought to rest by an electric field.
This means that the electric field caused the proton to lose all of its kinetic energy and come to a complete stop. Therefore,
we can conclude that the proton moved into a region of lower potential. The electric field did work on the proton by transferring its kinetic energy to electrical potential energy, which resulted in the proton being brought to rest.
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what do you see and hear? note: the clicking sound you hear comes from a geiger counter, an instrument that detects the particles and energy emitted by decaying radioactive atoms.
Imagine a scene where someone is using a geiger counter to detect radioactive particles and energy. The clicking sound indicates that the instrument is detecting some level of radiation in the environment.
The scene being described involves the use of a geiger counter to detect radiation. The clicking sound coming from the instrument indicates that some level of radioactive particles and energy are present in the environment.
In conclusion, the scene suggests that the use of geiger counters is an important tool in detecting and measuring radiation levels in various environments. The clicking sound from the instrument helps to alert users to the presence of potentially harmful radiation.
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the time required to stop a 200 kilogram wagon moving at 5 m/sec with a 40 newton force is:
The time required to stop a 200 kilogram wagon moving at 5 m/sec with a 40 newton force is: 40 N force.
What is newton?Newton (also known as Isaac Newton) was an English scientist and mathematician from the 17th and 18th centuries. He is widely recognized as one of the most influential scientists of all time. He made revolutionary contributions to mathematics, optics, and physics.
The time required to stop the wagon can be calculated using the equation for force, which states that force equals mass times acceleration.
F = m × a
Rearranging the equation to solve for acceleration yields: a = F/m
Substituting in the given values: a = 40 N / 200 kg = 0.2 m/s²
To calculate the time required to stop the wagon, we can use the equation for velocity, which states that velocity equals acceleration times time.
v = a × t
Rearranging the equation to solve for time yields: t = v/a
Substituting in the given values: t = 5 m/s / 0.2 m/s² = 25 s
Therefore, it will take 25 seconds for the wagon to stop with a 40 N force.
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How does nuclear fusion release energy that reaches the earth as radiation?.
Nuclear fusion in the Sun's core releases energy in the form of radiation, which travels through space and reaches Earth, providing light and heat essential for life.
Nuclear fusion occurs in the Sun's core, where extreme temperatures and pressures cause hydrogen atoms to combine and form helium. This process releases a significant amount of energy in the form of light and heat.
The energy released during nuclear fusion travels outward from the Sun's core through various layers, such as the radiative zone and the convective zone.
Upon reaching the Sun's surface, the energy is emitted as electromagnetic radiation, which includes visible light, ultraviolet light, and other forms of radiation.
This radiation travels through space, eventually reaching the Earth's atmosphere.
Some of this radiation is absorbed by Earth's atmosphere, while the rest reaches the surface, providing the heat and light necessary for life to exist.
In summary, nuclear fusion in the Sun's core releases energy in the form of radiation, which travels through space and reaches Earth, providing light and heat essential for life.
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calculate the mass defect in fe-56 if the mass of an fe-56 nucleus is 55.921 amu. the mass of a proton is 1.00728 amu and the mass of a neutron is 1.008665 amu. (you can neglect electrons)
The mass defect in Fe-56 is 0.527 amu. To calculate the mass defect, we first need to find the total mass of the protons and neutrons in an Fe-56 nucleus. Using the given masses, we can calculate the total mass as follows:
(26 protons x 1.00728 amu/proton) + (30 neutrons x 1.008665 amu/neutron) = 55.93438 amu
However, the actual mass of an Fe-56 nucleus is given as 55.921 amu. This means that there is a difference between the actual mass and the calculated mass, which is known as the mass defect. We can calculate the mass defect by subtracting the actual mass from the calculated mass:
55.93438 amu - 55.921 amu = 0.01338 amu
However, we are asked to calculate the mass defect per nucleus, so we need to divide this by the number of nucleons (protons + neutrons) in the nucleus:
0.01338 amu / 56 nucleons = 0.0002389285 amu/nucleon
Finally, we can convert this to atomic mass units (amu) by multiplying by Avogadro's number:
0.0002389285 amu/nucleon x 6.022 x 10^23 nucleons/mol = 0.527 amu
In summary, the mass defect in Fe-56 is 0.527 amu, which represents the difference between the actual mass of an Fe-56 nucleus and the calculated mass based on the masses of its constituent particles. This value is important in nuclear physics, as it reflects the amount of energy that is released when a nucleus is formed or destroyed.
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for a hanging mass of 0.061 kg and string density equal to 0.00040 kg/m, what is the velocity of a wave traveling down the string? group of answer choices 39 m/s 21 m/s 12 m /s 0.00040 m/s
The answer to the question is that the velocity of a wave traveling down the string is 39 m/s.
We can use the formula for wave velocity on a string, which is v = √(T/μ), where T is the tension in the string and μ is the linear density (mass per unit length) of the string.
First, we need to calculate the tension in the string. We know the mass of the hanging weight (0.061 kg), and we can assume that the weight is in equilibrium (not moving up or down), so the tension in the string is equal to the weight of the hanging mass. Therefore, T = mg = 0.061 kg * 9.81 m/s^2 = 0.599 N.
Next, we need to calculate the linear density of the string. We are given that the string density is 0.00040 kg/m, so the linear density is simply that value (0.00040 kg/m).
Now we can plug these values into the formula for wave velocity: v = √(T/μ) = √(0.599 N / 0.00040 kg/m) = 39 m/s.
So, the velocity of a wave traveling down the string is 39 m/s, calculated using the formula for wave velocity on a string with the tension and linear density provided.
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Three parallel plate capacitors, each having a capacitance of 1.0 µF are connected in parallel.
The potential difference across the combination is 100 V. What is the equivalent capacitance of this combination?
Three parallel plate capacitors, each having a capacitance of 1.0 µF are connected in parallel. The potential difference across the combination is 100 V. The equivalent capacitance of the combination is 3.0 µF.
When capacitors are connected in parallel, their equivalent capacitance is the sum of individual capacitances. Therefore, the equivalent capacitance of the three 1.0 µF capacitors connected in parallel is 3.0 µF. The potential difference across the combination of capacitors is the same as the potential difference across each capacitor, which is 100 V in this case. This means that the total charge stored in the capacitors is equal to the product of the equivalent capacitance and the potential difference, which is:
Q = Ceq × V
Q = 3.0 µF × 100 V
Q = 300 µC
Thus, the equivalent capacitance of the combination of capacitors is 3.0 µF, and the total charge stored in the capacitors is 300 µC.
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What style of differential does not vary the amount of torque sent to the wheels?.
The style of differential that does not vary the amount of torque sent to the wheels is called a locked or spooled differential.
A locked or spooled differential mechanically connects both wheels on an axle, so that they rotate at the same speed regardless of the traction available to each wheel. This means that the torque is evenly distributed to both wheels, without any variation.
Locked or spooled differentials are often used in off-road vehicles, drag racing cars, and other high-performance applications where maximum traction and power delivery are needed. However, they can make the vehicle less maneuverable in tight turn and can cause excessive tire wear and damage if used on paved roads for extended periods of time.
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A car is approaching a radio station at a speed of 25. 0 m/s. If the radio station broadcasts at a frequency of 74. 5 mhz, what change in frequency does the driver observe?.
The driver observes a change in frequency of approximately 62.07 Hz due to the Doppler effect as the car approaches the radio station.
To calculate the change in frequency observed by the driver, we use the Doppler effect formula for frequency:
f_observed = f_source * (c + v_observer) / c
where f_observed is the observed frequency, f_source is the source frequency (74.5 MHz), c is the speed of light (3.0 x 10^8 m/s), and v_observer is the speed of the car (25.0 m/s).
First, convert 74.5 MHz to Hz: 74.5 * 10^6 Hz.
Next, plug in the values:
f_observed = (74.5 * 10^6) * (3.0 * 10^8 + 25) / (3.0 * 10^8)
Calculate the observed frequency and subtract the source frequency to find the change in frequency:
Change in frequency = f_observed - f_source ≈ 62.07 Hz
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(a) what linear speed must an earth satellite have to be in a circular orbit at an altitude of 162 km above earth's surface? (b) what is the period of revolution?
0.15*10^7m/s is linear speed must an earth satellite have to be in a circular orbit at an altitude of 162 km above earth's surface. 0.67*10^-3s is the period of revolution
What are the three fundamental laws of gravitation?
According to the first law, until a force acts on an item, it will not alter its motion. According to the second law, an object's force is determined by multiplying its mass by its acceleration. According to the third law, when two objects come into contact, they exert pressures on one another that are equivalent in size and direction.
v ⇒ sqrt(GM/r)
G ⇒ 6.67*10^-11
M ⇒ 5.972 × 10^24 kg
r ⇒ 162km
v ⇒ sqrt(6.67*10^-11 * 5.972 × 10^24 / 162)
v ⇒0.15*10^7m/s
T ⇒2πr/v
T ⇒ 2*3.14*162/0.15*10^7
T ⇒0.67*10^-3s
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High speed photography reveals that when a bat strikes a baseball, a typical collision time is about 2 ms. If a speed of 45 m/s is imparted to a ball of mass 0.145kg, what average force is exerted by the bat?
The average force exerted by the bat on the baseball is 3262.5 N.
We can use the impulse-momentum theorem to solve this problem. The impulse-momentum theorem states that the impulse applied to an object is equal to the change in its momentum:
Impulse = Change in momentum
In this case, the bat applies an impulse to the baseball, which causes it to change its velocity from 0 m/s to 45 m/s. The momentum of the baseball before the collision is zero, so the change in momentum is:
Δp = mΔv = (0.145 kg)(45 m/s) = 6.525 kg m/s
The duration of the collision is 2 ms, or 0.002 s. The average force exerted by the bat is equal to the impulse divided by the duration of the collision:
F = Δp/Δt = 6.525 kg m/s / 0.002 s = 3262.5 N
Therefore, the average force exerted by the bat on the baseball is 3262.5 N.
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For an ohmic substance, the resistivity depends on: A.the electric field B.the potential difference C.the current density D.the electron mean free time E.the cross-sectionalarea of the sample
A. The resistivity of an ohmic substance depends on the electric field, which is determined by the potential difference (B) and current density (C).
What is resistivity?Resistivity is a measure of a material's ability to resist the flow of electric current. It is defined as the resistance of a unit length of a material to an electric current when the potential difference between its two ends is one volt. It is expressed in units of ohm-meters (Ω-m). Resistivity is an intrinsic property of a material and is independent of its size or shape. It is determined by the type of material and its structure, such as its crystal structure and the number of impurities present. The higher the resistivity of a material, the more difficult it is for electric current to flow through it.
It is also dependent on the electron mean free time (D), which is the average time between collisions of electrons with other particles, and the cross-sectional area of the sample (E).
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if you shoot a bullet from a gun and drop a bullet to the ground at the same time, which hits the ground first
Both bullets will hit the ground at the same time if we neglect air resistance.
This is because, according to the laws of motion, the acceleration due to gravity is the same for both objects, regardless of their masses. Therefore,
However, in reality, air resistance will affect the trajectory of the bullet that is shot from the gun, causing it to slow down faster than the bullet that is simply dropped. This means that, in practice, the bullet that is dropped will hit the ground first.
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40) A person tries to heat up her bath water by adding 5.0 L of water at 80°C to 60 L of water at 30°C. What is the final temperature of the bath water?
A) 34°C
B) 36°C
C) 38°C
D) 40°C
The final temperature of the bath water is 32°C.To find the final temperature, we need to use the principle of heat transfer, which states that heat lost by the hot water is equal to the heat gained by the cold water. Using the formula Q = mcΔT, where Q is the heat transferred, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature, we can solve for the final temperature.
First, we need to calculate the amount of heat lost by the hot water, which is (5.0 kg)(1.00 kcal/kg∙C°)(80°C - Tfinal). We also need to calculate the amount of heat gained by the cold water, which is (60 kg)(1.00 kcal/kg∙C°)(Tfinal - 30°C). Equating these two expressions, we get (5.0 kg)(1.00 kcal/kg∙C°)(80°C - Tfinal) = (60 kg)(1.00 kcal/kg∙C°)(Tfinal - 30°C). Solving for Tfinal, we get Tfinal = 32°C. Therefore, the final temperature of the bath water is 32°C.
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