The self inductance in the solenoid is
Self inductance in the solenoidWe have,
Length of solenoid = 49.0 cm = 0.49 m ⇒ l
Diameter of the solenoid = 10.0 cm ⇒ d
Radius = 5 cm = 0.05 m ⇒ r
Number of loops in the solenoid is 1000 ⇒ N
µ₀ = 4π × 10⁻⁷ H/m.
So, the self inductance in the solenoid is:
L = {μ₀ (N)² (A)}/l
= {(4π × 10⁻⁷) (1000)² (0.05)²}/0.55
= 0.00570 H = 5.70 mH
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A laser beam from Earth is reflected back from a mirror on the Moon in 2.60 s. If the distance between Earth and the Moon is 3.85 × 108 m, calculate the speed of light. Please show all work. (ref: p.438-446)
The formula used is related to echo formula under sound. The speed of light V is 2.9 × 10^8 m/s
What is Speed ?Speed can simply be defined as distance travelled per time taken. it is a scalar quantity and it is measured in m/s
Given that a laser beam from Earth is reflected back from a mirror on the Moon in 2.60 s. If the distance between Earth and the Moon is 3.85 × 108 m.
The speed of light V = 2d/T
Where
d = 3.85 × 10^8 mT = 2.6 sV = ?Substitute all parameters into the formula
V = (2 × 3.85 × 10^8) / 2.6
V = 7.7 × 10^8 / 2.6
V = 296153846.2
V = 2.9 × 10^8 m/s
Therefore, the speed of light is 2.9 × 10^8 m/s
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Calculate the force that is needed to propel a rocket into space if the rocket weighs 10,000 kg and the escape velocity for Earth's gravity is 11 km/s. (Hint: use the formula F = ma).
Mass:
Initial velocity:
Final velocity:
Time: 10 minutes
Force:
The correct answer is 183300 Newton amount of force is needed to propel a rocket.
What connection exists between force and mass of acceleration?
Mass times acceleration, or F=m x a, equals force. This means that in order to move an object at the same speed as an object with smaller mass, a stronger force is required. Newton's Second Law of Motion is this.
Force = Mass x acceleration
Initial velocity = 11 Km/s
Acceleration = Velocity / time = 11000 / 600 = 110/ 6 = 18.33 m/s^2
Force = 10000 x 18.33 = 183300 N
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A 5.0-kg and a 10-kg box are touching each other. A 45.0-N horizontal force is applied to the 5.0-kg box in order to accelerate both boxes across the floor the coefficient of kinetic friction is 0.200 determine the acceleration and the contact force
Answer:
Below
Explanation:
Fn = Normal force = (5 + 10) ( 9.81 ) = 147.15 N (Contact force)
Friction force = 147.15 * .2 = 29.43 N
Net force causing boxes to move = 45 - 29.43 = 15.57 N
F = m * a
15.57 = ( 5+10) * a shows a = 1.038 m/s^2
to advance in time the evolution of temperature of the atmosphere at any given point in the globe, models calculate the temperature changes due to
The forecasting of global surface temperatures is one of the most significant results of climate models.
Scientists evaluate the effectiveness of their models by contrasting observations of the Earth's climate with predictions of future temperatures and "hindcasts" of past temperatures. Then, by comparing specific climate models and the average of all models to actual warming, scientists may determine whether temperature projections are accurate.
Researchers can have more faith that models can effectively predict future changes in the same factors if they successfully simulate the climate response in the past.
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An apple is placed on a kitchen counter How could the movement of the particles in the apple be decreased
OA. Put it in the sunlight.
OB.
Put it in the microwave.
OC. Put it in the refrigerator.
OD.
Eat it for dinner
Reset
Submit
Answer: The correct option would be (Put it in the refrigerator)
Explanation: Have a good day :)
Answer:
C
Explanation:
Decreasing its temp decreases particle movement
What is the shape of the projectiles loaded for shotshells?.
Small spherical projectiles are few shapes of the projectiles loaded for shotshells.
A projectile is any object that once projected or dropped continues in motion by its own inertia and is influenced only by the downward force of gravity.
Projectile is a body projected by external force and continuing in motion by its own inertia and the velocity is constant horizontally.
Modern ammunition varies depending on the type of firearm. Rifles and handguns use a cartridge containing a single projectile (bullet). Shotguns use a shot shell containing either a single slug or a large number of small projectiles (shot or pellets). However, the basic components of cartridges and shot shells are similar. The projectile is one of them.
This projectile is similar to many. Single shot firearm is different from a repeating firearm because of the fact that the single shot firearm is in need to be reloaded each time that the single shot firearm is being used whereas the repeating firearm has extra cartilages by which it doesn't necessarily in need to be reloaded each time it has been fired.
Therefore, the shape of projectiles loaded for shot shells are small spherical projectile.
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please answer fast, you'll save my life TY!!!
Answer:
C and D
Explanation:
Electrostatic force = C q1 q2 / r^2
C = coulomb's constant q = charge r = distance between charges
so you can see that C and D will increase the force
What makes cells. Dont answer that I already know what it is. I just wanted to give people some points. lol have a nice day.✌
Thank you for the pointsss
Between ball b and ball c, ball ____________ has less potential energy because_________________________.
b: b; its mass is smaller
Between ball B and ball C, ball B has LESS potential energy because its mass is smaller.
A potential energy, stored energy that depends upon the relative position of various parts of a system. A spring has more potential energy when it is compressed or stretched.
Potential energy is given by formula.
Since, P.E is directly proportional to mass. Thus, the ball having smaller mass will have the less P.E.
Thus, option b is correct.
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What is the acceleration of the basketball with a mass of 0. 60 kg and a force of 10. 8 n? resisting forces are forces are ignored.
The net acceleration of a basketball where resisting forces are null is 18m/s².
Principle & Calculations-
Newton's second law provides a precise description of the modifications that a force can make to a body's motion. According to this, the force acting on a body has an equal and opposite magnitude and rate of change in its momentum over time. A body's momentum is determined by multiplying its mass by its speed. Similar to velocity, momentum is a vector quantity that has both a magnitude and a direction. The magnitude, direction, or both of the momentum of a body can be altered by an external force.One of the most crucial principles of physics is Newton's second law. For a body whose mass m is fixed, the equation F = ma can be used, where F (for force) and a (for acceleration) are both vector quantities.A body is propelled forward in accordance with the equation if there is a net force acting on it. On the other hand, there is no net force acting on a body if it is not accelerated.[tex]F=ma\\\\\\a=\frac{F}{m}[/tex]a= 10.8N/0.60 ⇒ 18m/s²To learn more about acceleration-
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Sketch or describe the FBD from for finding the static friction of the experiment. You can upload a picture or describe where all the vectors/forces point.
If describing, you can use phrases like: The weight is straight up The force is straight down The tension goes up the wooden block The force goes down the wooden block (Or anything else that would describe the FBD.)
Frictional force μk = T - ma / mg
As block is moving with acceleration 'a', so we will we equilibrium equation.
T - f = ma
T - μk N = ma
μk = T - ma/N
μk = T - ma / mg
where T = tension in rope
m = mass of block of wood
g = acceleration due to gravity
The net force acting on an object is equal to the rate at which its momentum varies over time, according to Newton's second law in its original version. This law suggests that an object's acceleration is directly related to its mass if it has a constant mass.
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A car braked with a constant deceleration of 18 ft/s2, producing skid marks measuring 100 ft before coming to a stop. How fast was the car traveling when the brakes were first applied?.
Answer:
[tex]60\; {\rm ft \cdot s^{-1}}[/tex].
Explanation:
Let [tex]a[/tex] denote the acceleration of this car; [tex]a = (-18)\; {\rm ft \cdot s^{-2}}[/tex]. Note that acceleration [tex]a\![/tex] measures the rate of change in velocity. Since this car is slowing down, acceleration [tex]a\!\![/tex] will be negative.
Let [tex]x[/tex] denote the displacement of the car. It is given that [tex]x = 100\; {\rm ft}[/tex] as the car braked.
Let [tex]v[/tex] denote the velocity of the car after braking. Since the car has stopped, [tex]v = 0\; {\rm ft \cdot s^{-1}}[/tex].
Let [tex]u[/tex] denote the initial velocity of the car. Apply the SUVAT equation [tex]v^{2} - u^{2} = 2\, a\, x[/tex] to find the value of [tex]u\![/tex]. Rearrange this equation to obtain:
[tex]u^{2} = v^{2} - 2\, a\, x[/tex].
[tex]\displaystyle u = \sqrt{v^{2} - 2\, a\, x}[/tex].
Substitute in [tex]v = 0\; {\rm ft \cdot s^{-1}}[/tex], [tex]a = 18\; {\rm ft \cdot s^{-2}}[/tex], and [tex]x = 100\; {\rm ft}[/tex] to find the value of [tex]u[/tex]:
[tex]\begin{aligned} u &= \sqrt{v^{2} - 2\, a\, x} \\ &= \left(\sqrt{0^{2} - 2 \times 18 \times 100}\right)\; {\rm ft \cdot s^{-1}} \\ &= 60\; {\rm ft \cdot s^{-1}}\end{aligned}[/tex].
In other words, this car was travelling at [tex]60\; {\rm ft \cdot s^{-1}}[/tex] before braking.
a machinist bores a hole 2.000 cm in diameter in a brass plate at a temperature of 20 c. what is the diameter of the hole when the temperature of the plate is increased to 200c? assume the expansion coefficient remains constant.
Let d2 be the hole's diameter. Therefore, the coefficient d2 = d1 (1 + alpha dt) remains constant.
Diameter and circumference are what?Since a circle's center must be the longest distance between any two points on the circle, the diameter is essentially twice as large as the radius. The distance around a circle or the duration of a circuit along a circle can be used to define its circumference.
What does a diameter mean in plain English?The distance that runs through the center of a circle through one point on its surface to another is known as the diameter of the circle.
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a fire protection code requires a minimum pressure of 65 psi at the outlet end (2) of a horizontal, 250 ft long, 4 inch diameter hose when the flowrate is 500 gal/min. what is the minimum pressure required at the inlet end (1). assume a roughness of e
A horizontal, 250-foot-long, 4-inch-diameter hose must have a minimum pressure of 65 psi at the outlet end (2) in order to comply with fire safety regulations.
what is the input end's minimum pressure requirement?The pressure present where the suction pipe connects to the booster pump is known as the inlet pressure, also known as pump intake pressure.The water pressure created if the booster pulls from a break tank or the pressure of the water provider determines the input pressure.Purchasing a pressure gauge from your neighborhood hardware shop and connecting it to a hose faucet is the most precise approach.To acquire a baseline reading, check the pressure when all other faucets and water-using devices are shut off.The ideal pressure range for domestic plumbing is between 30 and 80 psi.To learn more about minimum pressure requirement refer to:
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a transformer has 620 turns in the primary coil and 68 in the secondary coil. part a what kind of transformer is this? what kind of transformer is this? it's a step-up transformer. it's a step-down transformer.
A transformer has 620 turns in the primary coil and 68 in the secondary coil. Step-down transformer is the type of transformer utilized.
What is transformer and its type?In the fields of electricity and electronics, transformers are a common tool. It is an electromagnetic gadget that utilizes the fundamental electromagnetism theory developed by Michael Faraday.
Step up transformer:Exactly the opposite of a step-down transformer is a step-up transformer. Using a step-up transformer, the low primary voltage is raised to a high secondary voltage. Once more, it is accomplished by the proportion between primary and secondary windings.
Step down transformer:Reduction in height Both the electrical and electronic fields require transformers. A step-down transformer lowers the voltage across the secondary output from the primary voltage level.
Here,
no. of turns in primary coil = N[tex]_{p}[/tex] = 620
no. of turns in secondary coil = N[tex]_{s}[/tex] = 68
hence, N[tex]_{p}[/tex] > N[tex]_{s}[/tex]
so, the given transformer is step down transformer.
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A flat, circular loop of radius r = 1 m is at rest in a uniform magnetic field of magnitude b. The plane of the loop is parallel to the page and the magnetic field is directed perpendicular to and out of the page, as indicated by the blue dots. If the magnitude of the magnetic field decreases from 8 t to 2 t in 2 s, what is the rate of change in the magnetic flux through the circular loop?.
The rate of change in the magnetic flux for the induced emf in a loop is 9.42 volts.
Magnetic flux is the number of lines of force that penetrate a plane surface perpendicularly. Meanwhile, the induced emf is the emergence of an emf on the ends of the coil caused by a change in the magnetic flux enclosed by the coil.
ε = (dΦ/dt)
With:
ε = induced emf (volts)
ΔΦ = change in magnetic flux (Wb)
Δt = time interval for changing magnetic flux (s)
On a known matter
The radius of the circular loop: r = 1 m
Time: t = 2 s
Initial magnetic field: Bi = 2T
Final magnetic field: Bf = 8T
The expression for the induced emf in a loop is:
ε = (dΦ/DT) → Φ = magnetic flux
ε = [tex]\frac{d(BA cos 0)}{dt}[/tex] → θ = 90°
ε = [tex]A\frac{d(B)}{dt}[/tex]
ε = [tex]A \frac{Bf -Bi}{t}[/tex]
ε = π(1)² x (8-2/2)
ε = 22/7 x 3
ε = 9.42 volts
So, the induced emf in the loop is 9.42 volts.
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three blocks are stacked on top of one another.The top block has a mass of 4.6kg,the middle one has a mass of 1.2kg, and the bottom one has a mass of 3.7kg.Identify the calculate any normal force between the object
The normal force between the objects is achieved by adding up. They are 36.26 N and 48.02 N respectively.
What is Force ?A force can simply be defined as a pull or push. The normal force is a reactive force on the weight of an object.
Given that three blocks are stacked on top of one another. The top block has a mass of 4.6kg, the middle one has a mass of 1.2kg, and the bottom one has a mass of 3.7kg.
The weight of each block will be;
First block = 4.6 × 9.8 = 45.08 N
Middle block = 1.2 × 9.8 = 11.76 N
Bottom block = 3.7 × 9.8 = 36.26 N
The normal force between the bottom and the middle objects will be 36.26 N
The normal force between the middle and the first objects will be 36.26 + 11.76 = 48.02 N
The normal force on the first object will be 36.26 + 11.76 + 45.08 = 93.1 N
Therefore, the normal force between the objects are 36.26 N and 48.02 N respectively
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Which does not have much allowed values for each of the four quanta numbers: n, l, ml, and ms ?.
There are four quantum numbers in chemistry. These are the principal quantum number, the angular momentum quantum number, the magnetic quantum number, and the spin quantum number. These all follow these three foundational rules in chemistry.
Principle Quantum Number: It describes the size of the orbital and the main energy level. It is represented by n. Where, n = 1,2,3,4....stands for K, L, M, N shell and so on..
Angular momentum Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...
Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as . The value of this quantum number ranges from . When l = 2, the value of will be -2, -1, 0, +1, +2.
Therefore, we got to know that the values for each quantum number can be up to 4.
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HELP PLEASE FAST IT'S ARGENT I'LL GIVE (POINTS)
Answer:
Secondary succession
Explanation:
A 2.0 kg block is released from rest at the top of a rough plane inclined at 37° to the horizontal, as shown
below. The block slides down the incline with an acceleration of 4.0 m/s. What is the approximate magnitude
of the force of friction on the block as it slides down the incline?
Approximate magnitude of the force of friction on the block as it slides down the incline is calculated as 4N.
What is force of friction?
Force of friction is the force resisting the relative motion of solid surfaces, fluid layers and material elements sliding against each other. There are many types of friction like static friction, sliding friction, rolling friction, and fluid friction. Static friction is the strongest which is followed by sliding friction and rolling friction is the weakest. Fluid friction takes place in fluids which are liquids or gases.
Given mass is 2 kg and
acceleration is 4.0 m/s
m *g *sin 37° - F = m*a
F= m *g *sin 37° - m*a
=( 2* 9.81 * sin 37°- 2 *4)
=3.8 N
approximately equal to 4N
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How much does A car of mass 1110 kg weigh
⇒ In Earth the gravitational Constant is ≅9.81
To get the weight of the car we use the formula W=m×g
where W is the letter that represents the weight
m represents the mass of the car and g represents the gravitational constant.
[tex]W=1110*9.81\\W=10889.1[/tex]
⇒Weight is a force, therefore the unit of measurement is N which stands for Newtons.
⇒The car with a mass of 1110kg weighs 10889.1 N on Earth.
Answer:
Explanation:
A car of mass 1110 kg weigh:
F = m·g
F = 1110·10 = 11100 N = 11.1 mN
What are 10 types of malware?.
Malware can come in many different forms, but the most prevalent ones are viruses, keyloggers, worms, trojan horses, ransomware/crypto-malware, logic bombs, bots/botnets, adware & spyware, and rootkits.
How widespread is malware?Currently, there are more than 1 billion malware programmes available. Ransomware assaults affect four businesses per minute. Of all computer malware, trojans make up 58%.
Adware is malware that targets computer users and delivers intrusive advertisements. By claiming compensation from the companies whose ads are served by the malware, the malware's creator can profit. According to Check Point Research, adware is still the most prevalent kind of mobile malware.
Safeguarded Remote Desktop Protocol (RDP) and other risky services. Data backups should be done offline. Inform and educate end users about phishing and social engineering.
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Problem 4: In a multiple-slit interference experiment, 15 narrow slits are equally spaced 0.25 mm apart and illuminated with light of wavelength 570 nm. The interference pattern is projected on a screen 2.4 m away. 25% Part (a) What is the angular position, in degrees, of the third principal maximum? A=0.391 ✓ Correct! 25% Part (b) What is the angular position, in degrees, of the fourth principal maximum? 0 = 0.522 ✓ Correct! 25% Part (c) If y is the position along the screen measured from the center of the pattern, then what is the distance, Ay between the third and fourth principal maxima on the screen? Recall that the screen is located 2.4 m from the barrier with the slits. Ay=0.00548 ✓ Correct! * 25% Part (d) In an N-slit interference pattern, there are N - 2 secondary maxima and N - 1 dark minima between each pair of sequential principal maxima. The dark minima are equally spaced between the centers of the pair of principal maxima. Calculate the width, 8y, of the third principal maximum. dy= 0.000000712 Deductions 1% Potential Grade Summary mi 99%
Given- 15 narrow slits, d=0.25 mm, λ=570 nm, D=2.4m
Angular position (interference)- formulae β=Dλ/d
after solving we get Angular position = 0.391
b) angular position, in degrees, of the fourth principal maximum = 0.522
c) If y is the position along the screen measured from the center of the pattern, then the distance, Ay between the third and fourth principal maxima on the screen = 0.00548m
d) In an N-slit interference pattern, there are N - 2 secondary maxima and N - 1 dark minima between each pair of sequential principal maxima. The dark minima are equally spaced between the centers of the pair of principal maxima. The width is = dy = 0.000000712 m
The vector total of the amplitudes of the individual waves is equal to the consequent amplitude at a location where two or more waves of the same sort are incident, according to the principle of superposition of waves. When the crests of two waves of the same frequency collide at the same spot, constructive interference happens.
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if an extrasolar planet suddenly became more massive, but kept the same radius and orbit, what would change in the observed doppler shift of the star?
If an extrasolar planet suddenly became more massive, but kept the same radius and orbit, peak velocity of the star would increase in the observed doppler shift of the star.
fo = [ ( v + vo ) / v + vs ) ] fs
fo = Observer frequency of sound
v = Speed of sound waves
vo = Observer velocity
vs = Source velocity
fs = Actual frequency of sound waves
If an extrasolar planet suddenly became more massive, but kept the same radius and orbit, time between peaks in the velocity of the star would decrease in the observed doppler shift of the star. This means that the peak velocity of the star would increase.
Therefore, the change in the observed doppler shift of the star is that the peak velocity of the star would increase.
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The acceleration of gravity on planet X is 7.31 m/s/s. An object weighs 920.0 Newtons on Earth. What mass value would occupants of planet X determine
Mass
Help Links
4
kg
Inf
Answer:
thw answer is given on the photo above.. this is a very simple question based on force chapter of physics
125.85 Kg mass value would occupants of planet X determine.
What is force?A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
mass = weight/acceleration
mass = 920/7.31 = 125.85 kg
mass = 125.85 Kg
125.85 Kg mass value would occupants of planet X determine.
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if the skater started from rest 4 m above the ground (instead of 7 m ), what would be the kinetic energy at the bottom of the ramp (which is still 1 m above the ground)?
The kinetic energy at the bottom of the ramp is 2205 J.
The kinetic energy of an object is the electricity that it possesses because of its motion. Tt is defined because the work needed to accelerate a body of a given mass from rest to its stated velocity. Having won this power for the duration of its acceleration, the body maintains this kinetic electricity until its pace adjusts.
Kinetic energy is a form of strength that an object or a particle has by means of the cause of its motion. If work, which transfers electricity, is done on an object by way of applying an internet force, the item quickens and thereby gains kinetic electricity.
Calculation:-
KE = decrease in potential energy
= mg(h2 - h1)
= 75 * 9.81 * ( 4 - 1)
= 2205 J
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a whisper in a quiet library is about 30 decibels. what decibel level would be recorded by a table of 100 library patrons each whispering at 30 decibels? decibels
The decibel level that will be recorded by a table of 100 library patrons each whispering at 30 decibels is 50 decibels.
What is the decibel level?From the information, the relative intensity is 100. This can be illustrated as 10². Therefore, t = 2. Now the logarithm of the relative intensity is increased by 2 units.
The decibel will be:
= 10 × 2
= 20 units.
Therefore, the decibel level that will be recorded by a table of 100 library patrons will be:
= 20 + 30
= 50 decibels.
Therefore, the decibels level is 50 decibels.
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if the mass of the ladder is 12.0 kg , the mass of the painter is 55.0 kg , and the ladder begins to slip at its base when her feet are 70% of the way up the length of the ladder, what is the coefficient of static friction between the ladder and the floor? assume the wall is frictionless.
If the painter weighs 55.0 kg and the ladder weighs 12.0 kg, and the ladder starts to slide at the base when her feet are 70% of the way up the length of the ladder, The coefficient of static friction between the ladder and the floor is 0.5.
What do you mean by static friction?The resistance people feel when they try to move something that is stationary on a surface without actually moving their bodies or the surface they are trying to move it on.
n = F[tex]_{GY}[/tex]
F[tex]_{s} ^{max}[/tex] = F[tex]_{GX}[/tex]
F[tex]_{GY}[/tex] = μ[tex]_{s}[/tex] n
F[tex]_{GX}[/tex] = μ[tex]_{s}[/tex] F[tex]_{GY}[/tex]
Sum of horizontal forces is 0 = F[tex]_{GX}[/tex] -F[tex]_{W}[/tex] = 0
∴ F[tex]_{GX}[/tex] = F[tex]_{W}[/tex]
Sum of vertical forces is 0 = F[tex]_{GY}[/tex] - mg -Mg = 0
F[tex]_{GY}[/tex] = g (m+M)
Total torque at point a (foot of ladder) = 0
hence,
mg (1.5) + Mg(2.1) - F[tex]_{W}[/tex](4) =0
mg (1.5) + Mg(2.1) = F[tex]_{W}[/tex](4)
mg (1.5) + Mg(2.1) = F[tex]_{GX}[/tex](4)
mg (1.5) + Mg(2.1) = μ[tex]_{s}[/tex] F[tex]_{GX}[/tex](4)
mg (1.5) + Mg(2.1) = μ[tex]_{s}[/tex] g(m+M) (4)
μ[tex]_{s}[/tex] = [tex]\frac{mg (1.5) + Mg(2.1)}{4g(m+M)}[/tex]
μ[tex]_{s}[/tex] = [tex]\frac{12 (1.5) + 55(2.1)}{4(12+55)}[/tex]
μ[tex]_{s}[/tex] = 0.5
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The star wemadeit shows a stellar parallax angle of 0. 2 seconds of arc while the star waytoofar shows a stellar parallax angle of 0. 3 seconds of arc. From this, you can conclude that?.
We can conclude that Wemadeit is closer to our Sun than Waytoofar.
What is parallax angle ?
The parallax angle is the angle between the Earth one season of the year and the Earth six months later, as measured from a nearby star. Astronomers use this angle to determine the distance of this star from Earth. How do scientists measure this angle and from this information how do they know the distance to the star?
Since the earth revolves around the sun every year, every half year (6 months) it will be on the opposite side of what it was half a year ago. Because of this, nearby stars appear to move relative to distant "background" stars. You can see this effect when driving in the countryside. Nearby traffic signs appear to be moving fast, while distant buildings/trees, etc. appear to be moving slowly, but the sun is not moving at all! It wouldn't have happened otherwise.) Another example:
Hold the pencil at arm's length and look with one eye, then the other. Note that it changed position but didn't actually move. Your eyes model different locations on the earth. First on one side of the sun (nose), then on the other. Astronomers look up at the sky on a specific date and six months later to see how far nearby stars appear to be moving against the background. The angles at which these astronomers measure the motion of stars are actually the same angles they would see the motion of the Earth if they could travel to the stars. Scientists know how far the Earth has traveled in her six months (twice as much as the Sun does), so they have all the information they need to determine the distance to a star.
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What checks the power of a President?.
A statute may be subject to the President's veto in the executive branch, but with enough votes, the legislative branch can override the veto.
The legislative branch is in charge of approving presidential appointees, overseeing the budget, and having the power to impeach and remove the president. The supervision of the executive branch is the Congressional restraint on the President's power and a balance to his or her discretion in implementing laws and creating regulations. Proceedings are one of the main ways that Congress carries out oversight.There are several ways for the Congress to restrict the president's authority. The first method involves the Congress voting to remove the president from office through impeachment. The following method is "advice and permission." Judges and other officials can be chosen by the president, but the Congress must provide its consent.Thus this is how President's powers are checked.
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