293.7 degrees in a clockwise motion from the plus x-axis.
A=8 sin(37)i - 8 cos(37)j
A + B = -12 j
B = an I + b j, where and are constants that need to be determined.
A and B are equal to (a - 8 sin (37))i and (8cos(37) + b). j - 12 j = (8cos(37) + b) + (a - 8 sin (37)) I
Coefficients of I and j are compared.
B = 4.81452 I - 18.38908 j, or the fourth quadrant, from the equations a = 8 sin (37) = 4.81452 m and b = -12 - 8cos(37) = -18.38908.
In light of this, cos (Q) = 4.81452 / 12 Q = 66.346 degrees.
From the plus x-axis in the CCW direction, 360 - Q = 293.65 degrees.
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What is the conversion between mass and number of atoms?
In order to convert between mass and amount (of atoms or molecules), we use a mole. From the periodic table, we know the mass of each element in one mole of that element. And, we know how many atoms are in one mole. This is equal to Avogadro's number (6.02 x 10^23).
What is mass ?A quantitative measure of inertia, a fundamental characteristic of all matter, is known as mass in physics. The resistance a body of matter offers to a change in its speed or location as a result of the application of a force is what it is in essence. The change a force applies produces a change that is smaller the more mass a body has.
The quantity of matter or other constituents that make up an item is its mass. It is measured in kilogrammes, which can be shortened to kg. It's critical to keep in mind that mass and weight are two distinct concepts. Weight varies as the centre of gravity shifts, but mass remains constant.
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What are the half lives for uranium-235 and uranium-238?
a.
The half-life of uranium-235 is 713 seconds, the half-life of uranium-238 is 4.5 minutes
c.
The half-life of uranium-235 is 713,000,000 years, the half-life of uranium-238 is 4,500,000,000 years
b.
The half-life of uranium-235 is 713 days, the half-life of uranium-238 is 450 days
d.
None of the above
Answer:
C. The half-life of uranium-235 is 713,000,000 years, the half-life of uranium-238 is 4,500,000,000 years
you observe the sun rising directly in the east (due east). at the time of the sunrise, which of the following coordinates would describe the location of the sun in your local sky?
When the Sun is observed rising directly in the east (due east), its location in the local sky can be described using the following coordinates:
Azimuth: 90 degrees
Altitude: 0 degrees
Azimuth and altitude are two coordinate systems used to determine the position of celestial objects in the sky. Azimuth is measured in degrees clockwise from true north, while altitude represents the angular distance above the horizon, also measured in degrees.
Due to the Earth's rotation, the Sun appears to move across the sky throughout the day. During sunrise, the Sun is situated due east with an altitude of 0 degrees, meaning it is just at the horizon level. As the day progresses, the Sun's altitude gradually increases, reaching its highest point at solar noon. After reaching the peak, the Sun begins to descend, and by sunset, it can be found due west with an altitude of 0 degrees, once again at the horizon level.
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an organ pipe open at both ends has a length of 0.8 m. if the velocity of sound in air is 340m/s, what is the frequency of the second harmonic wave (in hz)?
The frequency of the second harmonic wave is 425 Hz
The length of the pipe = 0.8 m
The velocity of the sound = 340 m/s
The frequency of the second harmonic wave can be found using the formula,
v₂ = 2 v₁
where v₂ is the frequency of the second harmonic wave
v₁ is the fundamental frequency
So, the fundamental frequency can be found using the formula
v₁ = v / 2L
where v is the velocity of the sound
L is the length of the pipe
Let us substitute the known values in the above equation, we get
v₁ = 340 / 2 x 0.8
= 340 / 1.6
= 212.5 Hz
Then, the frequency of the second harmonic wave is
v₂ = 2 x 212.5
= 425 Hz
Therefore, the frequency is 425 Hz
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An unbalanced force of 30 N gives an object an acceleration of 6.0 m/s^2. What force would be needed to give it an acceleration of 1.0 m/s^2?
To calculate the force needed to give an object an acceleration of 1.0 m/s^2, we can use the equation F = ma, where F is the force, m is the mass of the object, and a is the acceleration.
Given that an unbalanced force of 30 N gives the object an acceleration of 6.0 m/s^2, we can find the mass of the object using the same equation:
F = ma
30 N = m x 6.0 m/s^2
m = 5 kg
Now that we know the mass of the object is 5 kg, we can use the same equation to find the force needed to give it an acceleration of 1.0 m/s^2:
F = ma
F = 5 kg x 1.0 m/s^2
F = 5 N
Therefore, a force of 5 N would be needed to give the object an acceleration of 1.0 m/s^2.
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Preview this picture of a roller coaster. Does it make you feel safe? How does the picture reinforce the idea of roller coasters being safe as stated in the article?
Answer: The coaster tracks serve to channel this force — they control the way the coaster cars fall. ... If the tracks slope down, gravity pulls the front of the car toward the ground, so it accelerates. If the tracks tilt-up, gravity applies a downward force on the back of the coaster, so it decelerates.
Explanation: They may be safe though!
Use the following v-t graph to answer the next questions
5
B
Velocity )
neters/second(s)
4
A
3
2
1
Time (1)
0
1
2
3
4
5
2
8
10
11
12
13
1015
16
second(s)
.1
D
-2
C С
3
5
Answer:
mag aral ka bubu
Explanation:
ang tanga mu hahahahhaha luko nandyan lang naman yan hahahhahahahahahahhahahahahahahahhahahahahahaahahahahahahahhahahahahahahahahahahahahaahhahahaahahhaahha09561782
how much does a 125kg person weight on earth
Answer:
300,000
Explanation:
its basicly adding 125+125+125+125+125+125+125+125+125 or125 x 9
F(x,y,z)=a^2xi+(y/a)j+az^2k
and let
be the sphere of radius 1 centered at the origin and oriented outward. Use a CAS to find all values of
such that the flux of
across
is
Use a symbolic computation software or specialized CAS program for the complex calculation involved in finding the values of "a" that satisfy the equation.
To find all values of a such that the flux of F(x, y, z) = a^2xi + (y/a)j + az^2k across the sphere of radius 1 centered at the origin and oriented outward is determined, we can use a Computer Algebra System (CAS) for calculation.
The flux of a vector field across a closed surface can be computed using the divergence theorem. The divergence theorem states that the flux of a vector field F across a closed surface S is equal to the triple integral of the divergence of F over the volume V enclosed by S.
In this case, the vector field F(x, y, z) = a^2xi + (y/a)j + az^2k has a divergence of 2a + 2/a. We need to evaluate this divergence over the volume enclosed by the sphere of radius 1 centered at the origin.
Using a CAS, we can calculate the triple integral of the divergence of F over the given volume. By setting the result equal to the surface area of the sphere (which is 4π), we can solve for the values of a that satisfy the equation.
Please note that due to the complexity of the calculation involved, it would be best to use a symbolic computation software or a specialized CAS program to obtain the exact values of a that fulfill the equation.
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1. What is capillary pressure? Difference in pressure across the interface between tuwa imm fuids in de reservoir 2. Expressing capillary pressure in terms of interfacial tension, contact angle, and capillary tube radius, 3. List two types of capillarity, 4. What is capillary hysteresis?
Capillary pressure refers to the difference in pressure across the interface between two immiscible fluids in a reservoir. There are two types of capillarity: spontaneous imbibition and forced displacement.
Capillary pressure is the pressure difference between two immiscible fluids, such as oil and water, in a porous medium. It arises due to the interfacial tension between the fluids, the contact angle at the fluid interface, and the size of the capillary tubes within the porous medium. The capillary pressure can be calculated using the Young-Laplace equation, which relates the capillary pressure to the interfacial tension, contact angle, and capillary tube radius.
There are two types of capillarity: spontaneous imbibition and forced displacement. Spontaneous imbibition occurs when a wetting fluid displaces a non-wetting fluid in a porous medium due to capillary forces. Forced displacement, on the other hand, involves injecting a fluid into a porous medium to displace another fluid.
Capillary hysteresis refers to the variation in capillary pressure during drainage (when the wetting fluid is being displaced) and imbibition (when the wetting fluid is being absorbed). This hysteresis is caused by the trapping of non-wetting fluids in the porous medium, leading to a difference in capillary pressure depending on the direction of fluid flow.
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Suppose a lion running at a velocity of 10 m/s east slows
down. After 30 seconds, the lion has stopped. What is the
lion's acceleration?
Answer:
\(a=0.34\ m/s^2\)
Explanation:
Given that,
Initial velocity, u = 10 m/s
Final velocity, v = 0 (stops)
Time, t = 30 s
We need to find the acceleration of the lion.
We know that,
Acceleration = rate of change of velocity
\(a=\dfrac{v-u}{t}\\\\a=\dfrac{10-0}{30}\\\\a=0.34\ m/s^2\)
So, the acceleration of the lion is \(0.34\ m/s^2\).
Why should a person warm up before physical activity?
Answer:
don't wanna pull anything
Explanation:
A good warm-up before a workout dilates your blood vessels, ensuring that your muscles are well supplied with oxygen. It also raises your muscles' temperature for optimal flexibility and efficiency. By slowly raising your heart rate, the warm-up also helps minimize stress on your heart.
Answer:
Here you go!
Explanation:
A good warm-up before a workout dilates your blood vessels, ensuring that your muscles are well supplied with oxygen. It also raises your muscles' temperature for optimal flexibility and efficiency. By slowly raising your heart rate, the warm-up also helps minimize stress on your heart. “Stretching allows for greater range of motion and eases the stress on the joints and tendons, which could potentially prevent injury. Warming up, such as low-heart rate cardio, prepares the circulatory and respiratory system for the upcoming ‘age- and type-appropriate target heart rate’ exercising, whether it’s endurance or sprint type of activities.” The cool-down is just as critical. It keeps the blood flowing throughout the body. Stopping suddenly can cause light-headedness because your heart rate and blood pressure drop rapidly. Before you exercise, think about warming up your muscles like you would warm up your car. It increases the temperature and flexibility of your muscles, and helps you be more efficient and safer during your workout. A warm-up before moderate- or vigorous-intensity aerobic activity allows a gradual increase in heart rate and breathing at the start of the activity.
Tips:
*Warm up for 5 to 10 minutes. The more intense the activity, the longer the warm-up.
*Do whatever activity you plan on doing (running, walking, cycling, etc.) at a slower pace (jog, walk slowly).
*Use your entire body. For many people, walking on a treadmill and doing some modified bent-knee push-ups will suffice.
Question 20
When energy is added to a wave, how can the wave change? Select all that apply
А
The frequency can increase.
The wavelengin can inc
С
The frequency can decrease.
D
The amplitude can decrease.
E
The wavelength can decrease.
F
The amplitude can increase.
Answer:
I would say A, I hope this helped ; >
Erin said that when you are standing in front of a fire you are warm because you release the coolness of your body to the heat of the fire.
Chris said that when you are standing in front of a freezer with the door open you feel cool because the air from the freezer is being transferred to your body.
Who has made the accurate statement regarding heat transfer?
Both Erin and Chris are correct.
Erin is correct.
Chris is correct.
Neither Erin nor Chris are correct.
third down, chris is correct
Explain the term balance point as applies to the Wheatstone Bridge.
Answer:
Explanation: The Wheatstone bridge is the interconnection of four resistances forming a bridge. ... To find the value of unknown resistance the deflection on galvanometer made to zero by adjusting the variable resistor. This point is known as balance point of Wheatstone bridge
Technician a says that there is often more than one circuit being protected by each fuse. technician b says that more than one circuit often shares a single ground connector. which technician is correct?
a. technician a.
b. technician b.
c. both technician a and b.
d. neither technician a and b.
Both technicians are partially correct.
Technician A is correct in stating that there could be multiple circuits being protected by a single fuse.
This is often the case in modern vehicles, where manufacturers try to reduce the number of fuses needed by grouping circuits together. However, Technician B is not entirely correct in stating that multiple circuits often share a single ground connector.
While it is true that some circuits may share a common ground, it is not always the case. Often, each circuit will have its own ground connection to ensure proper electrical operation and prevent interference between circuits.
Therefore, the correct answer is option C – both technicians are partially correct. It is important for technicians to have a detailed understanding of electrical circuits and their components to diagnose and repair issues in a vehicle’s electrical systems.
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Which method does not demagnetise a bar magnet? A Heat the bar magnet and place it in the east-west direction to cool. B Place the bar magnet in the east-west direction and hammer it. C Place the bar magnet in a coil connected to an a.c. supply and slowly withdraw it. o Place the bar magnet in a coil connected to a dc. supply and slowly withdraw it.
Answer:
C
Explanation:
( I dun know how to explain it but i do know that the answer is C. Saw it in a past paper.)
two people are trying to push a refrigerator. one person is pushing at an angle that is parallel to the floor and 70° to the front plane of the refrigerator with a force of 400 n, and the other is pushing at an angle that is parallel to the floor and 110∘ to the front p
Answer: As friction force is less than the Resultant
force so they will be able to move the fridge
Explanation:
top view of fridge
Angle between forces B= 180- 70- (186-110 )
= 170 - 70 = 40 -
Resultant of forces .
R = 1 ( FOR + ( 82 ) 2 + 2 FIF2 COS B .
J (40B) " + ( 375 ) 2 + 2 x 400 * 375 x Cos 40 "
7 28 - 31 1 N .
() friction force = 600.
As friction force is less than the Resultant
force so they will be able to move the fridge
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There is 728.311N force acting on the front plane. while two individuals attempt to push a refrigerator. Pushing with a force of 400 N, one person is positioned with their back.
Angle between forces B= 180- 70- (186-110 )
= 170 - 70 = 40
R= \(\sqrt{(F1^{2} )+(F2^{2})+2F1F2cos\alpha }\)
Here F1= 400
F2=375
alpha = 40
Resultant of forces .
728 . 31 1 N
friction force = 600.
friction force.
The refrigerator can be moved since the friction force is smaller than the resultant force.
Force's Definition. When an object interacts with another object, it experiences a push or pull that is known as a force. Every time two things interact, a force is applied to each of them.
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to determine the magnetic flux, magnetic field parallel to the surface is multiplied by the area of the surface. True or False
False. To determine the magnetic flux, multiply the magnetic field strength by the area, then multiply by the cosine of the angle between the field and area.
What is magnetic flux?Magnetic flux is a measurement of the total magnetic field which passes through a given area.
It is a useful tool for helping describe the effects of the magnetic force on something occupying a given area. The SI unit of magnetic flux is the Weber (named after German physicist and co-inventor of the telegraph Wilhelm Weber) and the unit has the symbol Wb.
Because the magnetic flux is just a way of expressing the magnetic field in a given area, it can be measured with a magnetometer in the same way as the magnetic field.
In conclusion, magnetic flux is not determined by the multiplication of the magnetic field parallel to the surface by the area of the surface.
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The volume of a container is 40 cm 3 . It has a length of 4 cm, a width of 2 cm. What is the height of the container?
Answer:
5cm
4x2 =8, 8x5 =40
so 4 x 2 x 5 = 40cm3
In dealing with every task assigned, why is planning important for a student?
Answer:
Having a planner gives students freedom to plan, organize and keep track of their work to the best of their abilities and requirements. This has a dual benefit in that it increases the student's accountability to the commitments planned as well as provides them with a structure that contributes to their success.
Explanation:
HELP PLEASEEE
Two identical balls roll down opposite
sides of a fnctionless platform, which one will be going faster at the bottom?
Answer: Ball #1
Explanation:
Since the platform is more inclined, it will allow the ball to roll down faster.
HELP WKDUXHWOSUSG PLSSSS
Hi!
givens: initial velocity = 0 m/s
time = 8.5 s
acceleration = 10 m/s^2
Unknown: displacement, velocity final
Equation:
Displacement = 1/2 (at^2) + viT
SS:
Displacement = 1/2 (10 * 8.5^2) + 0
Displacement = 361.25 m in a positive direction.
My math might be a little off, but I'm not sure...
But yeah! Hope this helped :)
A newly discovered planet is found to have density 2/3 pe and radius 2re, where pe and re are the density and radius of earth, respectively. The surface gravitational field of the planet is most nearly.
13 N/kg The surface gravitational field is given by acceleration due to gravity on the planet (g). Let the value of it on a newly discovered planet be g'.
What is the value of the gravitational field?The gravitational force acting on a mass of one kilogram is measured in newtons. G is assumed to be 9.806 N kg-1 at the surface of the Earth. Additionally, the acceleration of an item falling freely in the gravitational field of the Earth is denoted by the letter "g".
How does the gravitational field originate?Through the development of his theory of relativity, Albert Einstein demonstrated that gravity is a curvature in the space-time continuum rather than merely a force. Simply explained, an object's mass causes the space around it to essentially bend and curve. That may sound like it belongs in science fiction, but it's true.
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The pitch of a sound you hear depends on the------------------ of the sound wave.The pitch of a sound you hear depends on the------------------ of the sound wave.
Answer:
Frequency.
Explanation:
Sound are mechanical waves that are highly dependent on matter for their propagation and transmission.
Sound travels faster through solids than it does through either liquids or gases. A student could verify this statement by measuring the time required for sound to travel a set distance through a solid, a liquid, and a gas.
Mathematically, the speed of a sound is given by the formula:
Speed = wavelength * frequency
The pitch of a sound you hear depends on the frequency of the sound wave.
Answer:Frequency.
Explanation:Sound are mechanical waves that are highly dependent on matter for their propagation and transmission. Sound travels faster through solids than it does through either liquids or gases. A student could verify this statement by measuring the time required for sound to travel a set distance through a solid, a liquid, and a gas.Mathematically, the speed of a sound is given by the formula:Speed = wavelength * frequency
A force of 30.ON is acted on a block of mass 15.0kg placed on a horizontal surface but the boxdoes not move. Calculate the magnitude of the frictional force between the surfaces when theapplied force is along the horizontal and when it makes angle 60° with the horizontal.
We will have the following:
1. In the first case, we will calculate the normal force:
\(N=(15\operatorname{kg}\cdot9.8m/s^2)\Rightarrow N=147N\)Then, we will have that the fricion coefficient will be:
\(\mu_f=\frac{30.0N}{147N}\Rightarrow\mu_f=\frac{10}{49}\Rightarrow\mu_f\approx0.20\)So the magnitude of the friccional force when applied horizontally will be of 30.0N.
2. And the magnitude when applied horizontal but the block is on an inclined surface of 60°, we will have that:
\(F=(10/49)(15.0\operatorname{kg}\cdot9.8m/s^2)\cos (60)\Rightarrow F=15N\)So, the friction force when the force is applied, is 15N.
A white pool ball of mass 200g is hit with a velocity of 1.6ms^-1 and collides with a stationary
striped ball of the same mass.
If the striped ball moves off with a velocity of 1.9ms^-1
then calculate or find:
a) Velocity of the white ball after the collision
The diagram shows a state of matter in a closed system before and after undergoing a
change.
System before change
System after change
SEE
Which statement best explains the change in the system?
Particle motion decreases when thermal energy is added to the system
O Particle motion increases when solid particles are added to the system.
O Particle motion increases when thermal energy is added to the system.
O Particle motion decreases when gas particles are added to the system.
Answer:
the second one
Explanation:
Particle motion increases when solid particles are added to the system.
visible light shines on the metal surface of a phototube having a work function of 1.8 evev. the maximum kinetic energy of the electrons leaving the surface is 0.92 ev
When visible light shines on the metal surface of a phototube, electrons are emitted due to the photoelectric effect. The work function of the phototube, which is the minimum amount of energy required to remove an electron from the metal surface, is 1.8 eV. This means that the energy of the photons in the visible light must be greater than or equal to 1.8 eV in order to remove electrons from the metal surface.
The maximum kinetic energy of the electrons leaving the surface is 0.92 eV, which means that some of the energy from the photons is used to overcome the attraction of the metal ions and the rest is converted into kinetic energy of the emitted electrons. The difference between the energy of the photons and the work function of the metal is equal to the kinetic energy of the emitted electrons.
So, the energy of the photons in the visible light is greater than or equal to 1.8 eV, but less than or equal to the sum of the work function and the maximum kinetic energy, which is 1.8 + 0.92 = 2.72 eV. Any photons with energy in this range can cause electrons to be emitted from the metal surface.
When visible light shines on the metal surface of a phototube with a work function of 1.8 eV, it causes the photoelectric effect. The maximum kinetic energy of the emitted electrons is 0.92 eV, which means the incoming light has enough energy to overcome the work function and cause the emission of electrons from the metal surface.
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1. Two 500 g point masses are rotating on a light frame at a radius of 0.1 m from a vertical axis. The angular speed of the system is 20 rad s-1. a a) What is the moment of inertia of the system about the axis? b) What is the angular momentum of the system about the axis? c) If the masses were pulled into a radius of 0.05 m by an internal radial force, what would the angular momentum of the system now be? d) What is the new angular speed of each mass? e) By how much did the energy of the masses change?
(a) The moment of inertia of the system about the axis can be calculated using the formula for the moment of inertia of a point mass rotating about an axis.
(b) The angular momentum of the system about the axis can be determined by multiplying the moment of inertia by the angular speed.
(c) If the masses are pulled into a smaller radius, the moment of inertia will change, resulting in a new angular momentum for the system.
(d) The new angular speed of each mass can be calculated using the principle of conservation of angular momentum.
(e) The change in energy of the masses can be determined by comparing the initial and final kinetic energies of the system.
(a) To calculate the moment of inertia of the system about the axis, we consider the two point masses rotating at a given radius. The moment of inertia for each point mass is given by the formula I = m * r², where m is the mass and r is the radius.
Since there are two masses, we can calculate the total moment of inertia by summing the individual moments of inertia.
(b) The angular momentum of the system is determined by multiplying the moment of inertia by the angular speed. Using the formula L = I * ω, where L is the angular momentum, I is the moment of inertia, and ω is the angular speed, we can find the angular momentum of the system.
(c) If the masses are pulled into a smaller radius, the moment of inertia will change. We can calculate the new moment of inertia using the same formula as in (a) but with the new radius. With the new moment of inertia, we can determine the new angular momentum of the system.
(d) To find the new angular speed of each mass, we apply the principle of conservation of angular momentum. The initial angular momentum of the system is equal to the final angular momentum. By rearranging the equation L = I * ω and solving for ω, we can calculate the new angular speed.
(e) The change in energy of the masses can be determined by comparing the initial and final kinetic energies of the system. The initial kinetic energy is given by (1/2) * I * ω², where I is the initial moment of inertia and ω is the initial angular speed.
Similarly, the final kinetic energy can be calculated using the new moment of inertia and angular speed. The difference between the initial and final kinetic energies represents the change in energy of the masses.
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