if an electron (mass = ) is released at a speed of in a direction perpendicular to a uniform magnetic field, then moves in a circle of radius 3.8 cm, what must be the magnitude of that field?
Answers
The magnitude of the magnetic field must be 0.013 Tesla.
Based on the given information, we can use the formula for the magnetic force on a moving charged particle in a magnetic field:
F = qvB
where F is the force, q is the charge of the particle (in this case, the electron), v is the velocity of the particle, and B is the magnitude of the magnetic field.
Since the electron is moving in a circle, we know that the force must be directed towards the center of the circle. Therefore, we can set the magnetic force equal to the centripetal force:
F = mv^2/r
where m is the mass of the electron and r is the radius of the circle.
Setting these two equations equal to each other and solving for B, we get:
qvB = mv^2/r
B = mv^2/(qvr)
Plugging in the given values, we get:
B = (9.11 x 10^-31 kg) x (1.0 x 10^6 m/s)^2 / [(1.6 x 10^-19 C) x (3.8 x 10^-2 m)]
B = 0.013 T
Therefore, the magnitude of the magnetic field must be 0.013 Tesla.
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Related Questions
which term refers to a variable that is not allowed to change during an experiment
Answers
Answer:
Control Variable
Explanation:
The Control is a constant and not allowed to change.
a receiver in a football game is standing still, having just caught a pass. before he can move, a tackler, running at a velocity of 4.0 m/s, grabs him. the tackler holds onto the receiver, and the two move off together with a velocity of 3 m/s. the mass of the tackler is 100 kg. assuming that momentum is conserved, find the mass of the receiver.
Answers
According to the law of conservation of momentum, the total momentum before the collision is equal to the total momentum after the collision.
Let's assume the mass of the receiver is denoted as "m" (in kg).
Before the collision:
Momentum of the tackler (p1) = mass of the tackler (m1) * velocity of the tackler (v1)
Momentum of the receiver (p2) = mass of the receiver (m) * velocity of the receiver (0, as the receiver is standing still)
After the collision:
Total momentum = momentum of the tackler + momentum of the receiver
The total momentum after the collision is:
Total momentum = (mass of the tackler + mass of the receiver) * velocity after the collision (3 m/s)
Since momentum is conserved, we can equate the total momentum before and after the collision:
p1 + p2 = (m1 * v1) + (m * 0) = (m1 * v1) = (m1 + m) * 3
Simplifying the equation, we get:
m1 * v1 = m1 * 3 + m * 3
m1 * v1 = 3 * (m1 + m)
Now we can substitute the given values into the equation. Given:
m1 = 100 kg
v1 = 4.0 m/s
Substituting the values, we have:
100 * 4.0 = 3 * (100 + m)
Simplifying the equation:
400 = 300 + 3m
3m = 100
m = 100 / 3 ≈ 33.33 kg
Therefore, the mass of the receiver is approximately 33.33 kg.
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the force vs. time graphs for two collisions are shown. which collision has the largest impulse?
Answers
Momentum is a product of the mass and velocity of particles in motion while impulse is the rate of change of the momentum of particles/objects when a force acts on the object.
The impulse of the collision in system A is twice the impulse of the collision in system B
Impulse is given as J = F.dt
In case of impulse 1,
it is F(1-0.5) = 4* 0.5 = 2 Ns
In case of impulse 2,
it is = 2(2.5 - 1.5) = 2Ns
We saw that, both the impulses are calculated to be 2Ns.
Therefore, both the impulses in the graph are same.
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Given the densities of five objects: 2.00 grams/cm^3, 3.00 grams/cm^3, 4.00 grams/cm^3, 5.00 grams/cm^3, and 6.00 grams/cm^3. How many of these objects would float in water? A)1 B)2 C)3 D)4 E)0
Answers
Givne densities are,
\(\begin{gathered} \rho_1=2\text{ g/}cm^3 \\ \rho_2=3\text{ g/}cm^3 \\ \rho_3=4\text{ g/}cm^3 \\ \rho_4=5\text{ g/}cm^3 \end{gathered}\)The density of water is ρ=1 g/cm³.
Any object will float if the denisty of the object is less than the density of water, if the density of object is greater than the dnesity of water, then the object sink in the water.
In the given case, all the objects have density greater than the density of water. Therefore, all the objects will sink in the water.
Thus, option E is corret, no object will flot on the water.
A cup of tea with a temp. of 80°C is put on a table in a 20°C room. What happens to thermal energy and molecular motion of the tea when it is left on the table? *
Answers
Answer:
The thermal energy increases and the molecules move faster.
Because the current surge in starting multiple motors is too great for the system, there must be a delay between the starting of each motor.
Answers
Because the current surge in starting multiple motors is too great for the system, a delay between the starting of each motor is necessary.
When multiple motors start simultaneously, they draw a significant amount of current, resulting in a high inrush current that can overload the electrical system. To prevent this, a delay is introduced between the starting of each motor. This delay allows the system to stabilize and accommodate the initial surge in current before the next motor is started. By staggering the motor start times, the overall current demand is distributed more evenly, reducing the strain on the electrical system. This practice helps to prevent voltage drops, voltage fluctuations, and potential damage to electrical components. Therefore, introducing a delay between the starting of each motor is essential to ensure the proper functioning and longevity of the system.
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A 15 kg flywheel has all its mass around its outer rim. A string is wrapped around it and a m = 3.7 kg weight is hanging on the string. The flywheel has radius R = 0.25 m.
a) When the 3.7 kg weight is dropping with a speed of 1.7 m/s, what is the angular velocity of the flywheel?
w = ?? rad/s
b) When the 3.7 kg weight is moving with a speed of 1.7 m/s, what is the kinetic energy of the entire system?
K.E. = ?? J
c) If the system started from rest, how far has the weight fallen?
hfall = ?? m
d) What is the angular acceleration at this point?
a = ?? rad/s2
Answers
A 15 kg flywheel has all its mass around its outer rim. A string is wrapped around it and a m = 3.7 kg weight is hanging on the string. The flywheel has radius R = 0.25 m.
a) When the 3.7 kg weight is dropping with a speed of 1.7 m/s, the angular velocity of the flywheel 6.8 rad/s.
b) When the 3.7 kg weight is moving with a speed of 1.7 m/s, the kinetic energy of the entire system is 22.5 J.
c) If the system started from rest, the height weight fallen is 0.719 m
d) the angular acceleration at this point is 39.2 rad/s².
a) Angular velocity of the flywheel is given by :
w = v / r
Where, w = angular velocity of flywheel v = velocity of weight R = radius of flywheel
Therefore,w = v / r = 1.7 m/s / 0.25 m = 6.8 rad/s
Therefore, the angular velocity of the flywheel is 6.8 rad/s.
b) Kinetic energy of the entire system is given by :
K.E. = 1/2 * I * w²
Where, I = moment of inertia = mass of the flywheel * radius²
Thus,I = 15 kg * (0.25 m)²I = 0.9375 kg.m²
Therefore, K.E. = 1/2 * I * w²= 1/2 * 0.9375 kg.m² * (6.8 rad/s)²= 22.5 J
Therefore, the kinetic energy of the entire system is 22.5 J.
c) Potential energy of the weight at the top of the wheel is given by:
U = mgh
Where, m = mass of the weight = 3.7 kg g = acceleration due to gravity = 9.8 m/s² h = height fallen
Thus,U = 3.7 kg * 9.8 m/s² * h
Therefore, h = U / (mg) = (1.7 * 3.7 * 9.8) / (15 * 9.8)= 0.719 m
Therefore, the height fallen by the weight is 0.719 m
d) At this point, angular acceleration is given by:
a = alpha * r
Where, alpha = angular acceleration of flywheel
Therefore, alpha = a / r = g / r= 9.8 m/s² / 0.25 m= 39.2 rad/s²
Therefore, the angular acceleration at this point is 39.2 rad/s².
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In Part II, the independent variable changes to
Answers
In Part II of an experiment, the independent variable is the variable that is changed to see how it affects the dependent variable. The dependent variable is the variable that is measured to see how it is affected by the changes made to the independent variable.
In Part II, the independent variable changes to test the hypothesis and determine the relationship between the independent and dependent variables. The goal is to determine if changing the independent variable has any effect on the dependent variable.In order to change the independent variable, the experimenter must carefully manipulate the conditions of the experiment.
This can involve altering the amount of a particular substance used, changing the temperature, or adjusting the duration of the experiment, among other possibilities. The changes made to the independent variable must be carefully controlled so that they do not introduce extraneous variables that could affect the results of the experiment.
Finally, the results of the experiment must be carefully analyzed to determine if there is a statistically significant relationship between the independent and dependent variables. If the results show that the independent variable has a significant effect on the dependent variable, then the hypothesis is supported. If there is no significant effect, then the hypothesis must be revised or rejected.
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What are five atomic models that have been proposed over time ?
Answers
6. A student placed a cardboard box at the
bottom of a hill. The student then released a
ball from a point on the hill. The ball collided
with the box, and the box moved a distance
of 2 meters before both the box and the ball
came to rest. Which change to the initial
conditions would be most likfly to result in
the box moving a greater distance?
A. Decreasing the mass of both the ball and the
box
B. Decreasing the mass of the ball and
increasing the mass of the box
C. Increasing the mass of the ball and
releasing it from a lower point on the hill
D. Decreasing the mass of the box and
releasing the ball from a higher point on
the hill
Answers
The correct option for the given question is D. Decreasing the mass of the box and releasing the ball from a higher point on the hill.
A cardboard box was placed at the bottom of a hill, and a ball was released from a point on the hill. The box moved a distance of 2 meters before coming to rest, along with the ball. To move the box a greater distance, a change in the initial conditions is required. It can be achieved by decreasing the mass of the box and releasing the ball from a higher point on the hill.
According to the law of conservation of momentum, the total momentum before and after the collision is conserved. If the mass of the box is decreased, its momentum will be less after the collision. Therefore, the momentum of the ball will be greater than the momentum of the box, allowing it to move the box to a greater distance. Thus the correct option is Option D.
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determine the physical phenomenon that occurs
Answers
Answer: Core causes increase in magnetic flux in coil, hence greater change of magnetic flux.
Coil carrying alternating current has back emf.
Greater rate of change of magnetic flux causes back emf to increase.
Reduces net voltage & current decreases.
Light turns off because current decreases.
When iron core is removed back emf decreases & current increases, thus light turns on again.
The parking brake on a 1200kg automobile has broken, and the vehicle has reached a momentum of 7800kg.M/s. What is the velocity of the vehicle?
Answers
v=p/m
So you would do:
7800/1200=6.5
So the answer is:
6.5 m/s
Hope this helps :)
what is the maximum allowable length for float glass jalousies
Answers
The maximum allowable length for float glass jalousies is 150 cm.
What is Float Glass?
Float glass refers to a type of glass that is made by floating molten glass on a bed of molten metal. Float glass is a popular type of glass because it is both strong and durable.
Float glass is often used in windows, mirrors, and other applications where high-quality glass is required.
What is a Jalousie?
A jalousie is a type of window that consists of a series of parallel glass panes that are set in a frame. Jalousies are typically designed to allow air to flow through them, which makes them ideal for use in hot climates where ventilation is important.
What is the maximum allowable length for float glass jalousies?
The maximum allowable length for float glass jalousies is 150 cm. This means that any jalousies that are made from float glass cannot exceed this length. This limit is in place to ensure that the glass is strong enough to support itself and to prevent it from breaking under its own weight.
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If Earth's mass doubled, your weight would..
a. increase
b. decrease
c. stay the same
Answers
Answer:
a. increase
Explanation:
Doubling the mass of the Earth would double your weight, since gravitational force is directly proportional to mass, but doubling the radius (which doubles if the diameter doubles) would decrease your weight by a factor of 1/4, since gravitational force is inversely proportional to the square of the radius.
An object has an acceleration of 12.0 m/s/s. If the net force
was tripled and the mass were doubled, then the new
acceleration would be
m/s/s.
Answers
If an object has an acceleration of 12.0 m/s². If the net force was tripled and the mass was doubled, then the new acceleration would be 18 m/s².
What is Newton's second law?Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.
The mathematical expression for Newton's second law is as follows
F = m × a
As given in the problem net force was tripled and the mass was doubled,
3F = 2m × a
a₁ = 3/2 a
= 3/2 × 12
= 18 m /s²
Thus, the new acceleration would be 18 m/s².
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Which layer of the osi model ensures the data being sent from the sender is formatted correctly so it can be interpreted correctly by the recipient system?
Answers
6th layer of OSI model ensures complete and rebel delivery of data packets.
(presentation layer is the 6th layer.)
OSI - Open system Interconnection is a conceptual model that provides a common basis for the condition.
It is a reference model for how application communicate over a network.
This model describes 7 layer that computer system used to communicate over a network.
It was the model for network communication and adopted by all major computer and companies.
The complications between US computing system are split in several layers.
physical. Datalink. Network. Transport. Session Presentation Application.The purpose of OSI reference model is to guide technology developer.
4th layer (presentation layer) of OSI model ensures complete and rebel delivery of data packets.
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Describe what it means to view something from a frame of reference. Give an example to illustrate your explanation. (4 points)
Answers
You are standing a distance d to the left of a firecracker (F
L
), and second firecracker (F
R
) is a distance d to the right of the first firecracker. You observe that the leftmost firecracker explodes at time t=0, and that the right most firecracker explodes at time t=d/2c.
Answers
The speed of sound in the medium is given by the equation v = d/(t_R - t_L), where v is the speed of sound, d is the distance between the two firecrackers, t_R is the time at which the rightmost firecracker explodes, and t_L is the time at which the leftmost firecracker explodes.
In this scenario, the time at which the rightmost firecracker explodes, t_R, is given by t_R = d/(2c), where d represents the distance between the two firecrackers and c is the speed of sound. The leftmost firecracker, on the other hand, explodes at time t_L = 0.
By substituting these values into the equation for the speed of sound, v = d/(t_R - t_L), we can simplify it to:
v = d/(d/(2c) - 0)
= d/(d/(2c))
= 2c
Hence, the speed of sound in the medium is equal to 2c.
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A Van De Graaf generator is an electrostatic generator and may collect a large enough charge to produce
a(n) _____.
electric current
electric field
electrostatic induction
coulomb of electricity
Answers
A Van De Graaf generator is an electrostatic generator and may collect a large enough charge to produce an electric current. Option A.
A Van de Graaff generator is an electrostatic generator that uses a moving belt to store charge in hollow metal spheres on insulating posts, producing very high potentials. Produces direct current (DC) at low currents and very high voltages.
Van de Graaff generator the motor turns silicone rollers to move rubber bands. As the belt moves, electrons are transferred from the rubber belt to the silicone roller charging the belt positively and the roller negatively. Van de Graaff generators extract electrons from the Earth move them along belts and store them in large spheres. These electrons repel each other and try to separate as much as possible by spreading over the surface of the sphere.
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4x consider the differential equation with initial condition . a. use euler's method with two steps to estimate when : (be sure not to round your calculations at each step!) now use four steps: (be sure not to round your calculations at each step!) b. what is the solution to this differential equation (with the given initial condition)? c. what is the magnitude of the error in the two euler approximations you found? magnitude of error in euler with 2 steps
Answers
At two steps the approximate solution is 3.25, and after four steps, it is 4.5
To find an approximate solution to the given differential equation with the given initial condition, you can use Euler's method with two steps.
At t = 2, the approximate solution is 3.25, and after four steps, it is 4.5. The difference between the two estimates, which is 1.25, would reflect the size of the mistake in the two Euler approximations you discovered.
The idea of numerical errors must be understood in order to fully investigate Euler's method. Numerical mistakes happen during the numerical solution of a differential equation when the approximate solution is not sufficiently close to the genuine solution. Numerous variables, such as the chosen numerical approach, the number of steps executed, the step size, and the precision of the beginning circumstances, might contribute to these inaccuracies.
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A
Read the following passage and use it to answer the questions that follow.
In volleyball, the person serving the ball (Player A) tosses it up to start the ball moving. The server then
strikes the ball, changing its direction and increasing its speed toward the opposing team. When the ball
reaches the other team, a player applies a new force, causing the ball to slow and go up. Then, a player
(Player B) applies a stronger force to send the ball back to the serving team. This continues until the
motion of the ball is stopped.
?
2.
The ball is an example of a
a. Force
b. Gravity
C. Projectile
d. Parabola
What force is pulling the ball to the floor?
Answers
Bài 1. Một chiếc xe trong 2 giờ đầu xe đi được quãng đường 40 km, trong 3 giờ tiếp theo xe đi được quãng đường 90 km. Tính tốc độ của xe trên cả quãng đường.
Answers
Answer:
sorry I don't understand
Explanation:
please translate it in english
Regarding a string with constant tension T and linear density μ, please calculate the ratio of standing wave frequency between adjacent harmonic modes f2/fı, fs/f2, f4/fs and fs/f4
Answers
The ratio of standing wave frequencies between adjacent harmonic modes for a string with constant tension T and linear density μ are as follows:
- f2/f1 = 2
- f3/f2 = 3/2
- f4/f3 = 4/3
- f5/f4 = 5/4
For a string with constant tension and linear density, the frequency of a harmonic mode is given by the formula f_n = n(v/2L), where n is the mode number (1, 2, 3, etc.), v is the speed of the wave on the string, and L is the length of the string.
Since the speed of the wave on the string (v) is determined by the square root of the tension (T) divided by the linear density (μ), the formula can also be expressed as f_n = n(1/2L)√(T/μ). To find the ratio between adjacent harmonic modes, we simply divide the frequencies:
- f2/f1 = (2/2L)√(T/μ) / (1/2L)√(T/μ) = 2
- f3/f2 = (3/2L)√(T/μ) / (2/2L)√(T/μ) = 3/2
- f4/f3 = (4/2L)√(T/μ) / (3/2L)√(T/μ) = 4/3
- f5/f4 = (5/2L)√(T/μ) / (4/2L)√(T/μ) = 5/4
Summary: The ratios of standing wave frequencies between adjacent harmonic modes for a string with constant tension T and linear density μ are f2/f1 = 2, f3/f2 = 3/2, f4/f3 = 4/3, and f5/f4 = 5/4.
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On a fake planet, you find that on a certain day at noon no shadow is cast. At the same time your friend sees a shadow due to the Sun being 12 degrees away from the Zenith. Knowing the distance between you and your friend is 500 km, what is the circumference of this fake planet
Answers
Answer:
In 250 BC, Eratosthenes measured the circumference to be about 24,500 miles:
by this method, 12 deg = 12 / 360 = 1/30 of the planet's surface\
30 * 500 km = 15,000 km in circumference, about 9,200 miles
Two bears sit on a see-saw. The see-saw is 3.5 m in total
length with the fulcrum at the center. A 40 kg baby bear sits at the very end of one side. Where should the 120 kg father bear sit relative to the center to keep the see-saw balanced?
Answers
Answer:
Explanation:
For the see-saw to be balanced, take moment at the fulcrum:
40g * 3.5/2 = 120g * distance
distance = 1.167m from the center
what is visible spectrum?
Answers
Explanation:
The band of electromagnetic radiation that human eyes can detect. This ranges from wavelengths of approximately 400 to approximately 700 nanometers (nm).
Explanation:
It's the portion of the electromagnetic spectrum that is visible to the human eye.
calculate work done by a 50 n force pushing a pencil .75m
Answers
Explanation:
work done=force*distance
force=50n
distance=75m
therefore work done is
50*75=3750joules
Explanation :
W =FS
W = 50N(75m)
W = 3750J
A 30 kg child is sitting on a swing. Their weight is exerting a downward force on the swing. The ropes are exerting an upward force on the swing. The swing is not moving. What is the net force on the swing?
A.294 N down
B.294 N up
C.0 N
D.30 kg
Answers
the rotation axis of uranus is select an answer and submit. for keyboard navigation, use the up/down arrow keys to select an answer. a nearly perpendicular to the plane of its orbit, so it has no seasons. b almost in the plane of its orbit so that its ring system can sometimes be seen as near-circles. c inclined at an angle to the perpendicular that is similar to earth's rotation axis.
Answers
Since it is practically in the plane of its orbit, its ring system occasionally appears to be made up of near-circles. The majority of scientists think that Uranus' rotation is the result of a violent collision.
Does Uranus' axis of rotation fall within the plane of its orbit?In contrast to other planets, Uranus has an axis that nearly parallels its orbital plane. This causes Uranus to rotate virtually on its side as it travels through its orbit, with its poles alternately pointing toward the Sun.
What planet rotates in the opposite direction?Venus and Uranus' rotation on their axes is remarkable in some ways. All other planets revolve from the West to the East, but they do the opposite.
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Why would there be different considerations for regular lenses vs sunglasses and what would be the preference?
Answers
There are several considerations when comparing regular lenses and sunglasses, including their primary functions, lens properties, and intended usage.
Protection from sunlight: Sunglasses are primarily designed to protect the eyes from harmful UV rays and intense sunlight. They have specialized lens coatings that block a significant amount of UV radiation. Regular lenses, on the other hand, may not offer the same level of UV protection unless specifically designed for it.
Glare reduction: Sunglasses are often equipped with polarized lenses that reduce glare caused by reflected light from surfaces such as water, snow, or roads.
This feature is particularly useful for outdoor activities like driving, skiing, or water sports. Regular lenses typically lack polarization, so they don't provide the same level of glare reduction.
Tint and visibility: Sunglasses have different tint options to enhance contrast, reduce brightness, or provide specific color filtering. These tints can improve visual comfort in different lighting conditions. Regular lenses, however, are usually clear and transparent, providing natural color perception.
Fashion and style: Sunglasses are often chosen for their aesthetic appeal and fashion statement. They come in various designs, shapes, and colors to complement different face shapes and personal styles. Regular lenses, on the other hand, are more focused on functionality and may not have as wide a range of fashionable options.
In terms of preference, it depends on the specific needs and activities of the individual. If protection from UV rays and glare reduction are important, sunglasses with appropriate coatings and polarized lenses would be preferred.
For regular daily activities that don't involve intense sunlight, regular lenses may suffice, especially if UV protection is not a primary concern. Fashion and personal style also play a role in the preference for sunglasses as they can be a fashionable accessory.
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