A large semitrailer truck and a small car have equal momentum. How do their speeds compare?.

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.

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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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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In the scientific community determined precise value of Mu to make C12 weigh 12 Mu that indicates that one C12 atom weighs 12/NA grams. because NA = 6.0223 X 10²³.

By definition, an atom of C-12 has a mass of 12 Atomic Mass units.

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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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The magnitude of the force exerted on the car to accelerate is 0.5588m N

We got some values here,

v[tex]_{0}[/tex] = 30 mil/h = 13,4112 m/s

v[tex]_{1}[/tex] = 55 mil/h = 24,5872 m/s

t = 20 s

First, we should find the acceleration of the car

a = v/t

a = v[tex]_{1}[/tex] - v[tex]_{0}[/tex] / t[tex]_{1}[/tex] - t[tex]_{0}[/tex]

a = 24.5872 - 13.4112 / 20 - 0

a = 11.176 / 20

a = 0.5588 m/s[tex]^{2}[/tex]

Now we got the amount of acceleration. We can found the force by the formula of: F = m.a but we are not given the mass value in the question. So, we can answer this question by this way

F = m.a

F = m × 0.5588 m/s[tex]^{2}[/tex]

F = 0.5588m N

Acceleration (a) is the change in velocity (Δv) over the change of time (Δt), represented by the equation a = Δv/Δt. This allows you to measure how quick velocity changes in meters per second squared (m/s[tex]^{2}[/tex]. Acceleration is also a vector quantity, so it includes both magnitude and direction.

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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.

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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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

The net acceleration of a basketball where resisting forces are null is 18m/s².

Principle & Calculations-

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Product of mass and acceleration is the magnitude of force.

A push or pull of an object is called force. Product of mass and acceleration is the magnitude of force. The S.I. unit of force is m/s². Unit can be represented by newton symbol is N.

F = m × a

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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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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.

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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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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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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A transformer has 620 turns in the primary coil and 68 in the secondary coil. Step-down transformer is the type of transformer utilized.

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.

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.

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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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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An egg is dropped from a treehouse and takes 5 seconds to reach the ground. Air resistance can be ignored. The displacement of the egg will be 122.5m.

This question is from the branch of physics called kinematics. We use equations of motion to find out the unknown quantity from the given data. Let us use the equation of motion, s=ut+1/2*a*t²

where, s is the displacement of the egg in metres

u is the initial velocity of the egg in m/s

a is the acceleration in m/s²

t is the time in seconds

As we know that, the egg is in a freefall condition, its initial velocity is zero and acceleration is nothing but acceleration due to gravity here as it is under the action of gravity.

s=1/2*g*t²

s=1/2*9.8*5*5

s=122.5m

So, the displacement of the egg is 122.5m.

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The value of theta for the maximum height is 30°.

Calculation:-

Since the angle from the horizontal is Cosθ, therefore the angle from the vertical is sinθ.

Hmax = U² sin²θ/2g

11.25 = 30² sin²θ/2g

sin²θ = (11.25 × 2 × 10)/900

   ⇒    sin²θ   =   0.25

    ⇒   sin θ = 0.5

    ⇒   sin θ = 1/2 = 30°

The horizontal pace of a projectile is regular (in no way converting in value), and there's a vertical acceleration because of gravity; its cost is 9.8 m/s/s, down, The vertical speed of a projectile changes via nine.8 m/s every second, The horizontal motion of a projectile is impartial of its vertical movement.

Projectile motion is a form of motion experienced with the aid of an object or particle that is projected in a gravitational field, such as from Earth's floor, and movements alongside a curved route below the action of gravity best.

Projectile motion is the movement of an object thrown (projected) into the air. After the initial force that launches the item, it most effectively reports the pressure of gravity. The object is known as a projectile, and its route is called its trajectory.

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The normal force between the objects is achieved by adding up. They are 36.26 N and 48.02 N respectively.

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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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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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

Increasing following distance to Four-seconds when encountering other motorists who follow too closely  is an example of appropriate implementation of the IPDE defensive driving strategy for the  maintenance of an appropriate Safety Cushion.

Continuous scanning is essential to manage the nine to fifteen space driving zones while maintaining the necessary safety cushion while using the IPDE defensive driving approach. As a result, drivers need to be able to recognise the objects and hazards in their line of sight and their direction of movement.

They ought to anticipate potential conflict hotspots. They should decide what driving behaviours are suitable and safe to use, when, and where. In order to ensure that confrontations are avoided, action must be taken.

Identify, Predict, Decide, and Execute is the acronym for IPDE. Off-road driving should also employ this tactic. Determine any items or situations that could be problematic for you while driving. Make an educated guess as to what might happen when you come across the thing or condition.

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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

The decibel level that will be recorded by a table of 100 library patrons each whispering at 30 decibels is 50 decibels.

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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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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Approximate magnitude of the force of friction on the block as it slides down the incline is calculated as 4N.

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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Let d2 be the hole's diameter. Therefore, the coefficient d2 = d1 (1 + alpha dt) remains constant.

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.

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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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.

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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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.

Thus this is how President's powers are checked.

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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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