Select the correct answer.
A Kelvin (K) is a unit of measurement in the International System of Units. Which quantity is measured in Kelvin?
Group of answer choices

length

electric current

mass

temperature

weight

The centripetal acceleration (a) of an object moving in a circular path is given by the formula:

a = v^2 / r

where v is the speed of the object and r is the radius of the circular path.

If the object moves at a uniform speed of 4v instead, we can plug this value into the formula to find the new centripetal acceleration (a'):

a' = (4v)^2 / r

Simplifying the expression, we get:

a' = 16v^2 / r

Now, we can compare the new centripetal acceleration (a') to the original centripetal acceleration (a):

a' = 16(a)

So, if the object moves in the same circular path at a uniform speed of 4v, the centripetal acceleration will be 16 times greater than the original centripetal acceleration.

Answer: V 2 /r

Explanation: "If a particles move with a uniform speed of V on any given circular path having the radius (r), the particle will have a centripetal acceleration of magnitude (v 2 /r). However, the direction continuously changes and always maintains its position towards the circle."

From this data it is clear that the time require to complete ramp 3 is more than any other, hence it can be large ramp or there are more objectless or  turns. Ramp 2 requires least time to complete, it can be shorter or having less number of obstacles.

An inclined plane, also known as a ramp, is a flat supporting surface that is slanted at an angle from the vertical direction, with one end higher than the other, and is used to help raise or reduce a weight. The inclined plane is one of the six traditional basic devices established by Renaissance scientists. Inclined aircraft are used to transport big cargoes over vertical obstructions. Examples include a ramp used to load items into a truck, a person going up a pedestrian ramp, and an automobile or railroad train climbing a gradient. it can have obstacles in the path

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Answer:

w = d×f = 2.1 × ( 5×9.8)= 102.9J

Explanation:

because the question is asking for the energy PE

Answer:

\(\boxed {\boxed {\sf 102.9 \ J}}\)

Explanation:

Potential energy is the energy an object possesses due to position. The formula is:

\(PE= m \times g \times h\)

where m is the mass, g is the acceleration due to gravity, and h is the height.

We know the book is 5 kilograms and is on a 2.1 meter high bookshelf. Since this is on Earth, the acceleration due to gravity is 9.8 meters per square second.

Substitute the values into the formula.

\(PE= 5 \ kg \times 9.8 \ m/s^2 \times 2.1 \ m\)

Multiply the numbers together.

\(PE= 49 kg *m/s^2 *2.1 \ m\)

\(PE= 102.9 \ kg*m^2/s^2\)

\(PE= 102.9 \ J\)

The book has 102.9 Joules of gravitational potential energy.

Answer:

Explanation:

Let the velocity of projectile be v and angle of throw be θ.

The projectile takes 5 s to touch the ground during which period it falls vertically by 100 m

considering its vertical displacement

h = - ut +1/2 g t²

100 = - vsinθ x 5 + .5 x 9.8 x 5²

5vsinθ =  222.5

vsinθ = 44.5

It covers 160 horizontally in 5 s

vcosθ x 5 = 160

v cosθ = 32

squaring and adding

v²sin²θ +v² cos²θ = 44.4² + 32²

v² = 1971.36 + 1024

v = 54.73 m /s

Answer:

55.42 m/s

Explanation:

Along the horizontal direction, the rock travels at constant speed: this means that its horizontal velocity is constant, and it is given by

u_x = d/t

Where

d = 160 m is the distance covered

t = 5.0 s is the time taken

Substituting, we get

u_x =160/5 = 32 m/s.

Along the vertical direction, the rock is in free-fall - so its motion is a uniform accelerated motion with constant acceleration g = -9.8 m/s^2 (downward). Therefore, the vertical distance covered is given by the

\(S=u_yt+\frac{1}{2}at^2\)

where

S = -100 m is the vertical displacement

u_y is the initial vertical velocity

Replacing t = 5.0 s and solving the equation for u_y, we find

-100 = u_y(5) + (-9.81)(5)^2/2

u_y = 45.25 m/s

Therefore, the speed with which the rock was thrown u

\(u= \sqrt{u_x^2+u_y^2} \\=\sqrt{32^2+45.25^2}\\ = 55.42 m/s\)

Answer:

Force = Mass × Acceleration

F = MA

F = 30kg × 3ms^-2

F = 90 N

Answer:

Freud's importance to psychology and psychiatry remains in the foundational aspects of the science of human behavior and the mind. Outside of Freudian psychoanalysis, Freud is no longer applicable or important to practical applications of psychological theory.

The change in velocity in y direction, if the runner accelerates at 0.350 m/s² at 52° angle is 2.83 m/s.

Acceleration of an object is the rate of change in velocity. It is a vector quantity having both direction and magnitude.

a = Δv/t

The initial velocity u = 2.88 m/s

a = 0.350 m/s²

the time t = u/a = 2.88 /0.350 = 8.2 s.

vy = uy + ay t

uy = u sin θ = 2.88 sin 52 =2.84 m/s

ay = 0.350 sin 52 = 0.345 m/s²

then vy = 2.84 m/s + (0.345 m/s²) 8.22 s = 5.67 m/s

then change in velocity in the y-direction is calculated as:

Δy = vy - uy

    = 5.67 m/s  - 2.84 m/s = 2.83 m/s

Therefore, the change in velocity in y-direction Δy for the runner is 2.83 m/s.

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The substances that are altered and the chemicals on the right side of a chemical equation are the results of a chemical reaction. B and D are the appropriate choices.

Reactants are the substance(s) in a chemical equation to the left of the arrow. A component that is present at the outset of a chemical reaction is known as a reactant. Products are the substance(s) to the right of the arrow. A substance that remains after a chemical reaction is complete is known as a product. The creation of products from the reaction of two reactants is known as a chemical reaction. The compounds that result from a reaction are called products. The substances that are original materials are the reactants.

On the left side of the reaction are the reactants, and on the right are the products. B and D are the proper choices as a result.

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Answer:

913 hours ur welcome :)

Answer:

if its adding its 9 if its multiplying its 18 if its division its 2

Answer:

18.36 m/s

Explanation:

We can solve this using conservation of energy. The energy in the system will be conserved since there are no outside forces acting upon it so the potential energy and kinetic energy will be equal. Giving us this formula to start:

1/2mv^2=mgh

m=mass

g=gravity

h=height

v=velocity

We can start by figuring out the total height the rock travels which we can do by subtracting the height of the frisbee by the height the rock started at.

19m-1.8m=17.2m

Now we can plug in our variables to solve for velocity.

First we negate mass since its on both sides and cancels out leaving us with.

1/2v^2=gh

Plug in.

1/2v^2=(9.8)(17.2)

1/2v^2=168.56

v^2=337.12

v=18.36m/s

Explanation:

kE =1/2mv²

1/2(0.6×(3m/s)²

1/2(0.6×9m/s)

2.7J I think this is the answer

The average kinetic energy of the toy car is 2.7 J.

The energy of the body by the virtue of its motion is known as the kinetic energy of the body. It is defined as the product of half of mass and square of the velocity.

Given data;

Mass of car is,m= 600 g = 0.6 kg

d is the distance travelled = 6 m

T is the time travelled = 2 sec

The velocity of the car is found as;

v  = d /t

V = 6m / 2 sec

V = 3 m/sec

KE =1/2mv²

KE = 1/2 × 0.6 kg ×( 3 m/sec )²

KE = 2.7 J

Hence, the average kinetic energy of the toy car is 2.7 J.

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ANSWER:

66.8 m

STEP-BY-STEP EXPLANATION:

Given:

Area of mirror = 28.02 cm²

We make a sketch of the situation in order to solve the problem:

We calculate the height as follows:

Now, we determine for AEF that it has the same angle as ABC, like this:

It is located 66.8 meters from the pole

The minimum coefficient of static friction required for this claim to be made possible is 0.7

In an inclined plane system, the coefficient of static friction is the angle at which an object slide over another.  

The gravitational force component exceeds the static friction force when the angle rises. Hence, the object begins to slide.

According to Newton second law;

\(\sum F_x = \sum F_y = 0\)

\(\mathbf{mg sin \theta -f_s= N-mgcos \theta = 0 }\)

\(\mathbf{mg sin \theta =f_s}\)

\(\mathbf{mg sin \theta =\mu_s N}\)

N = mg cos θ

Equating both force components on the L.H.S and R.H.S, we have the following

\(\mathbf{mg sin \theta =\mu_s \ mg \ cos \theta}\)

\(\mathbf{sin \theta =\mu_s \ \ cos \theta}\)

\(\mathbf{\mu_s = \dfrac{sin \theta }{ cos \theta}}\)

According to the trigonometry rule:

\(\mathbf{tan \theta= \dfrac{sin \theta }{ cos \theta}}\)

∴

\(\mathbf{\mu_s =\tan \theta}}\)

\(\mathbf{\mu_s =\tan 35^0}}\)

\(\mathbf{\mu_s = 0.700}}\)

Therefore, we can conclude that the minimum coefficient of static friction needed for this claim to be possible is 0.7

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According to the Vogt-Russell theorem, the structure of a star in hydrostatic and thermal equilibrium with all energy produced from nuclear processes is uniquely defined by its mass and chemical element distribution throughout its interior.

Despite being called a theorem, the Vogt-Russell theorem has never been officially proven. The theorem is named for the astronomers Heinrich Vogt and Henry Norris Russell, who separately devised it.

The Russell-Vogt Theorem, which states that the nature of a star is essentially entirely governed by its mass, age, and starting composition, explains why stars have such a well-defined brightness and temperature range while they are burning hydrogen in their interiors.

This trend is especially noticeable because the initial composition has little influence in comparison to the other two. The upper luminosity limit is caused by stars more massive than about 100 times the mass of the sun blowing themselves apart, while the lower luminosity limit is caused by objects less massive than about 0.08 times the mass of the sun failing to develop satisfactory pressure and temperature in their cores to burn hydrogen.

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A

Explanation: sorry sir but its required step up transformer for high voltage not step

Answer:

1. M = 67,422,800,892,977.54 kg

2. r = 15 km

Explanation:

The diameter of the Comet Tempel 1, D = 9.0 km across

The speed with which the dust escapes = 1.0 m/s

1. The escape velocity, \(v_e\), is given by the following formula

\(v_e = \sqrt{\dfrac{2 \cdot G \cdot M}{R} }\)

Where;

G = The universal gravitational constant = 6.67430 × 10⁻¹¹ N·m²/kg²

\(v_e\) = The escape velocity of the debris = 1.0 m/s

M = The mass of the comet from where the debris escapes

From the escape velocity equation, we have;

\(M = \dfrac{v_e^2 \cdot R}{2 \cdot G}\)

Plugging in the values for the variables, we get the mass of the comet, 'M', as follows;

\(M = \dfrac{1.0^2 \times 9,000}{2 \cdot 6.67430 \times 10^{-11}} \approx 67,422,800,892,977.54 \, kg\)

The mass of the comet, M ≈ 67,422,800,892,977.54 kg

2. When the debris has lost 60% of its initial kinetic energy, we have;

\(60\% \, K.E. = 0.6\cdot K.E. = 0.6 \times \dfrac{1}{2} \times m \times v_e^2 = \dfrac{G \cdot M \cdot m}{r}\)

\(\therefore \, The \ distance \ of \ debris \ from \ the \ center, \, r = \dfrac{G \cdot M }{0.6 \times \dfrac{1}{2} \times v_e^2 }\)

\(r = \dfrac{6.67430 \times 10^{-11} \times 67,422,800,892,977.54}{0.6 \times \dfrac{1}{2} \times 1^2 } = 15,000\)

When the debris has lost 60% of its initial kinetic energy, the distance the debris will be from the comet's center, r = 15,000 m = 15 km

Answer:

are free to study what causes problems

Answer:

44M 64M

Explanation:

Given

Spring constant, k=56 N/m

The weight of the block, F=18 N

To find

The stretch in the spring

Explanation

By hook's law,

where x is amount the spring is stretched.

Putting the values,

Conclusion

The amount by which the spring is stretched is 0.32 m

Answer:

electrons move causing the object to be positive or negative charged

Answer:

The rate of increase of the magnetic field is 0.0311 T/s.

Explanation:

Given;

number of turns of the coil, N = 100 turn

diameter of the coil, D = 7.0 cm = 0.07 m

diameter of the copper wire, d = 0.5 mm = 0.5 x 10⁻³ m

induced current, I = 2.0 A

The induced emf is calculated as;

\(emf = IR = NA\frac{dB}{dt}\\\\\frac{dB}{dt} = \frac{IR}{NA} \\\\Where; A \ is \ area \ of \ the \ coil = \frac{\pi D^2}{4}\\\\\)

\(\frac{dB}{dt}\) is the rate of increase of the magnetic field, B

R is the resistance of the copper wire

\(R = \frac{\rho L}{A} = \frac{\rho D}{A}= \frac{\rho D}{\frac{\pi d^2}{4} }\)

Where; ρ is the resistivity of copper wire = 1.68 x 10⁻⁸ Ωm

\(R = \frac{(1.68 \times 10^{-8})(0.07)}{\frac{\pi (0.5\times 10^{-3})^2}{4} } \\\\R = 5.989 \times 10^{-3} \ ohms\)

\(\frac{dB}{dt} = \frac{(2)(5.989 \times 10^{-3})}{(100)(\frac{\pi \times (0.07)^2}{4} )} \\\\\frac{dB}{dt} =0.0311 \ T/s\)

Therefore, the rate of increase of the magnetic field is 0.0311 T/s.

Answer:

12: If the bird flies 10m in 2s, it's speed is then 10m/2s, which we can simplify giving us 5m/s

13: Flying 5000 km in eight hours means that it's flying at (5000 / 8)km/h, or 625km/h

14: A speed graph will not go below zero, an acceleration graph will.

Answer:

1.14*10^-3m

Explanation:

We know that

Volume= mass/ density

But

Area x depth= mass/density

πr²*depth= mass/density

r²=m/πdp

So

r= √0.35/3.142*0.085*1000

r= 1.14*10^-3m

Answer:  momentum is determined and conserved.

Answer:

monument is determined

The sum of the resistance = 2 ohms x 80 lights = 160 ohms.

Current = Total voltage / total resistance:

Current = 120V / 160 ohms

Current = 0.75 Amps

Answer:2.47

Explanation: did the math

The speed of the ball have in falling 3.6 s is 35.5 m/s.

The speed of the ball is calculated using the equation of a body falling under the influence of gravity or velocity of free fall.

The equation of the motion of the body is given as follows:

v = u - gt

where;

u is the initial velocity

g = acceleration due to gravity

t = time

v = final velocity

Assuming u = 0 m/s, g = 9.8 m/s², t = 3.6 s

v = 0 - 9.8 * 3.6

v = 35.5 m/s

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