Help plsss I need to answer this​

Answer: The scenario violates the second law of thermodynamics.

Explanation: The second law states that heat cannot be converted into work without some loss of usable energy, and that the amount of usable energy in a closed system will always decrease over time. Therefore, the machine described in the scenario cannot exist because it would violate the second law by converting all of the heat into electricity without any loss of usable energy.

Given data:

Height of the tree;

Initial velocity;

The velocity of sequoia when it reaches the ground is given as,

Here, g is the acceleration due to gravity.

Substituting all known values,

Therefore, sequoia will reach the ground with a velocity of 44.27 m/s.

Assuming the same pressure difference, the blood flow rate will be reduced by 49%.

Volumetric flow rate is calculated as follows;

Q = V/t

Q = πr³/t

r = d/2

r³ = d³/8

Q = πd³/8t

Q = ¹/₈ πd³/t

Q₁/d₁³ = Q₂/d₂³

Q₂ = d₂³(Q₁/d₁³)

d₂ = 100%d₁ - 21%d₁ = 79%d₁

Q₂ = (0.79d₁)³(Q₁/d₁³)

Q₂ = 0.49d₁³(Q₁/d₁³)

Q₂ = 0.49Q₁

Q₂ = 49%

Thus, assuming the same pressure difference, the blood flow rate will be reduced by 49%.

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The momemtum is not conserved in scenario d.

Momentum of an object is the product of its mass and velocity.

To determine in which of the conditions in which momentum is not conserved, we need to know the law of conservation of momentum.

The law of conservation of momentum states that as long as no external force acts on a system, the total momentum of the system of two colliding objects is conserved.

If we consider scenarios a, b and c, we see that no external force acts on the system of two objects in the three instances so, the total momentum is conserved.

In scenario d, an external force acts on the system, so total momentum is not conserved since according to the law of conservation of momentum, total momentum is only conserved when there is no external force acting on a system.

So, the momemtum is not conserved in scenario d.

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The magnetic force per unit length of the wire is (C) (0.49i - 0.51j - 1.37k) N/m.

To calculate the magnetic force per unit length of the wire, we can use the formula:

F = I * (L x B),

where F is the force, I is the current, L is the length vector of the wire, and B is the magnetic field.

Given:

Current, I = 3A

Length vector, L = √√3 * (i + j + k)

Magnetic field, B = 0.75i + 0.4k

Let's calculate the cross product of L and B:

L x B = | i j k |

|√√3 √√3 √√3|

|0.75 0 0.4|

To evaluate this cross product, we calculate the determinants:

(i) component: (√√3 * 0 - √√3 * 0.4) = -0.4√√3

(j) component: (-√√3 * 0.75 - √√3 * 0) = -0.75√√3

(k) component: (√√3 * 0.75 - √√3 * 0) = 0.75√√3

Now, multiply the cross product by the current:

F = 3A * (-0.4√√3i - 0.75√√3j + 0.75√√3k)

Simplifying this expression gives:

F = (-1.2√√3i - 2.25√√3j + 2.25√√3k) N

Therefore, the magnetic force per unit length of the wire is approximately (-1.2√√3i - 2.25√√3j + 2.25√√3k) N/m.

Comparing the given answer options, the closest match is C. (0.49i - 0.51j - 1.37k) N/m.

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Explanation:

We know that momentum is the product of mass and velocity so

An object's mass times its velocity gives the object's momentum

Hope it will help :)

a. Upthrust on the solid:

\(Upthrust = volume of solid * density of fluid * g = 1000 kg/m^3 * volume of solid * 10 m/s^2\)

b. Volume of the solid:

\(volume = mass/density = 1.3 kg / (1000 kg/m^3) = 1.3 x 10^-3 m^3\)

c. Density of the solid:

So,\(density = mass/volume = 1.3 kg / (1.3 x 10^-3 m^3) = 1000 kg/m^3\)

Upthrust is the upward force exerted on an object immersed in a fluid. It is equal to the weight of the fluid displaced by the object and acts in the opposite direction to gravity. Upthrust helps to counteract the weight of the object and keep it afloat.

a. The upthrust on an object immersed in a fluid is equal to the weight of fluid displaced by the object. The weight of fluid displaced can be calculated using the formula:

Weight of fluid = volume of fluid * density of fluid * g

Since the solid is completely immersed in water, the volume of the fluid displaced is equal to the volume of the solid. The density of water is given as 1000 kg/m^3, and the acceleration due to gravity is given as\(10 m/s^2.\)

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Answer:

A. Prototype

Explanation:

i just took the test

Answer:

A. Prototype

Explanation:

hope this helps :)

Answer:

Work = Mass * Gravity * Height and is measured in Joules. Imagine you find a 2 -Kg book on the floor and lift it 0.75 meters and put it on a table. Remember, that “force” is simply a push or a pull. If you lift 100 kg of mass 1-meter, you will have done 980 Joules of work.

Explanation:

The frequency of red light having wavelength 650nm in vacuum is 4.6 x 10¹⁴ Hz.

The frequency of light can be calculated using the formula:

frequency = speed of light / wavelength

In vacuum, the speed of light is approximately 3 x 10⁸ m/s.

Converting the wavelength to meters: 650 nm = 650 x 10⁻⁹ m

Plugging these values into the formula, we get:

frequency = (3 x 10⁸ m/s) / (650 x 10⁻⁹ m) = 4.6 x 10¹⁴ Hz

Therefore, the frequency of red light with a wavelength of 650nm in vacuum is 4.6 x 10¹⁴ Hz.

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When a small rubber ball bounces off a larger, heavier basketball, the basketball will move slightly in the opposite direction, but it will move much slower than the rubber ball due to its larger mass.

According to Newton's third law of motion, every action has an equal and opposite reaction. In the case of the small rubber ball bouncing off the basketball, the rubber ball exerts a force on the basketball, and the basketball exerts an equal and opposite force back on the rubber ball.

As a result, the small rubber ball bounces back in the opposite direction, while the basketball experiences a force in the opposite direction.

The motion of the basketball after the small ball bounces back depends on the mass and velocity of the two objects. Since the basketball is much larger and heavier than the rubber ball, it will not move much, if at all.

In fact, if the rubber ball is light enough and bounces back with enough force, it may cause the basketball to move slightly in the opposite direction. However, the basketball will move much slower than the rubber ball due to its larger mass and slower acceleration.

In terms of direction, the basketball will move in the opposite direction of the rubber ball, as dictated by the conservation of momentum. Since the total momentum of the system before and after the collision must be conserved, the basketball will move in the opposite direction of the rubber ball to balance out the momentum.

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Answer:

C 1 degree

Explanation:

The wave speed of the wave was calculated from the frequency and the wave length is 1600 m/s. Hence, option D is correct.

The speed of the wave is obtained by the product of frequency and the wavelength of the wave. It is measured in m/s.

From the given,

frequency of the wave (f) = 270 Hz

Wavelength (λ)  = 6m

Wave speed = f×λ

                    = 270×6

                     = 1620 m/s

Thus, the wave speed of the wave is 1620 m/s. Hence, the ideal solution is option D.

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Answer:

I believe the answer is specific gravity

Explanation:Hope this helps :)

Answer:

spirit animal?

Explanation:

Answer:

4) oscillator

Explanation:

4) oscillator

Answer:

Melting and frezzing are physical changes

The correct statement is " A dry cell battery has magnetic properties.", The correct option is C.

A dry cell battery does generate its own magnetic field due to the flow of electric current through the battery.

The magnetic field is created by the movement of charged particles (electrons) within the battery. This magnetic field is relatively weak and is not typically strong enough to be used for practical applications outside of the battery itself.

So, the magnetic properties of the dry cell battery are important for understanding its behavior within an electrical circuit.

Therefore, The correct answer is option C.

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Answer:

The lithosphere is divided into huge slabs called tectonic plates. The heat from the mantle makes the rocks at the bottom of lithosphere slightly soft.

Explanation:

The Earth's lithosphere is broken into many small and large slabs of rock that are known as tectonic plates.

Earth is divided into four parts :

Lithosphere is the rigid and rocky outer portion of earth's surface. It consists of crust and upper mantle.

Asthenosphere is mostly found in the uppermost mantle of earth. It is weak in nature. Hot molten magma comes out from here.

Our earth is broken into 7 major and some minor plates.

7 Major Plates are :

Minor Plates are :

Hence, our lithosphere is divided into many small and large slabs of rock, and they are known as tectonic plates.

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Answer:

C from the liquid water to the solid ice

Explanation:

The direction of heat flow is from the liquid water to the solid ice. Thermal energy generally flows from a body at a high temperature to one at lower temperature values.

Heat will flow from the boiled water to the solid ice mass.

The thermal energy moves from the liquid water to the solid ice because heat energy moves from hotter body to colder body.

Thermal energy moves from hotter body to colder body so we know that in this experiment water is a hotter body whereas ice cubes are colder body so the heat energy will definitely moves from hot body to the cold body.

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Voltage depends on the amount of resistance, current according to the Ohm's law, and, by definition, is the measurement of electrical pressure.

According to the Ohm's Law,  the current through a conductor between two points is directly proportional to the voltage across the two points.

Mathematically,

V ∝ I

V = IR

where, R is the resistance of the conductor and I is the current flowing in the conductor. So, the voltage depends on the amount of resistance and current.

Also, Voltage is the pressure from an electrical circuit's power source that pushes charged electrons (current) through a conducting loop, enabling them to do work such as illuminating a light.

Hence All of the above option in the given question are true.

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(a) The magnitude of the spring's displacement when the acceleration of the box is zero can be determined by equating the initial gravitational potential energy to the elastic potential energy stored in the spring.

(b) The magnitude of the spring's displacement when the spring is fully compressed can be determined by equating the initial gravitational potential energy to the elastic potential energy stored in the spring.

(a) To determine the magnitude of the spring's displacement when the acceleration of the box is zero, we need to apply the principles of conservation of energy.

Initially, the box has gravitational potential energy given by mgh, where m is the mass of the box, g is the acceleration due to gravity, and h is the height from which the box was dropped. The initial gravitational potential energy is converted into the elastic potential energy stored in the compressed spring and the kinetic energy of the box just before it makes contact with the spring.

The gravitational potential energy is given by:

mgh = (1.9 kg)\((9.8 m/s^2)h\)

The elastic potential energy stored in the spring is given by:

1/2 kx^2\(kx^2\), where k is the spring constant and x is the displacement of the spring.

The kinetic energy of the box just before it makes contact with the spring is given by:

\(1/2 mv^2,\) where m is the mass of the box and v is the speed of the box.

Since the acceleration of the box is zero at the instant when the spring's displacement is maximum, the kinetic energy is zero. Therefore, we can equate the initial gravitational potential energy to the elastic potential energy to find the spring's displacement.

mgh = 1/2 \(kx^2\)

Substituting the given values, we have:

\((1.9 kg)(9.8 m/s^2)h = 1/2 (300 N/m)x^2\)

Solving for x, the magnitude of the spring's displacement, we can determine its value at the instant when the acceleration is zero.

(b) To find the magnitude of the spring's displacement when the spring is fully compressed, we need to consider the conservation of mechanical energy once again.

At maximum compression, all the initial gravitational potential energy is converted into the elastic potential energy stored in the compressed spring.

mgh = 1/2 \(kx^2\)

Substituting the given values and solving for x, the magnitude of the spring's displacement, we can determine its value when the spring is fully compressed.

It's important to note that in both cases, the negative sign of the displacement indicates that the spring is being compressed. The magnitude of the displacement will be a positive value.

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Answer:

x = 45 cm

Explanation:

Given that,

The length of a rod, L = 50 cm

Mass, m₁ = 0.2 kg

It is at 40cm from the left end of the rod.

We need to find the distance from the left end of the rod should a 0.6kg mass be hung to balance the rod.

The centre of mass of the rod is at 25 cm.

Taking moments of both masses such that,

\(15\times 0.2=x\times 0.6\\\\x=\drac{3}{0.6}\\\\x=5\ cm\)

The distance from the left end is 40+5 = 45 cm.

Hence, at a distance of 45 cm from the left end it will balance the rod.

The approximate mass of a dark star is 4.35 times the mass of the Sun.

To find the ratio of the mass of the dark star to the mass of the Sun, we can use the binary star formula, which states that the total mass of a binary star system is equal to the mass of the visible star divided by the sine of the angle between the line of sight and the line connecting the two stars:

m1 / sin i = (v² ×T) / (4 × pi² ×d)

where m1 is the mass of the visible star, v is the orbital velocity of the visible star, T is the orbital period of the visible star, i is the angle between the line of sight and the line connecting the two stars, and d is the distance between the two stars.

In this case, we are given the mass of the visible star (m1 = 6.9 Ms), the orbital velocity of the visible star (v = 270 km/s), the orbital period of the visible star (T = 18.1 days), and we can assume that the angle between the line of sight and the line connecting the two stars is 90 degrees (since we cannot see the dark star).

Substituting these values into the binary star formula, we get:

m1 / sin i = (270² × 18.1) / (4 ×pi² × d)

Since sin 90 = 1 and m1 = 6.9 Ms, we can simplify the equation to:

6.9 Ms = (270²× 18.1) / (4 × pi²× d)

Solving for d, we find that d = (270²× 18.1) / (4 × pi²× 6.9 Ms) = 2.43 x 10¹¹ meters.

Now that we know the distance between the two stars, we can use the binary star formula again to find the mass of the dark star. Substituting the values we have calculated into the binary star formula, we get:

m2 / sin i = (v²×T) / (4 × pi²× d)

where m2 is the mass of the dark star and v, T, and d are the same as before. Knowing that m1 = 6.9 Ms and sin i = 1, we can solve for m2 to find the mass of the dark star.

m2 = (v²×T × m1) / (4 × pi²× d)

Substituting the known values, we get:

m2 = (270²× 18.1 × 6.9Ms) / (4 × pi²× 2.43 x 10¹¹)

Simplifying, we find that the mass of a dark star is m2 = 8.7 Ms.

Therefore, the ratio of the mass of a dark star to the mass of the Sun is m2 / Ms = 8.7 / 1.99 = 4.35.

Therefore, the approximate mass of a dark star is 4.35 times the mass of the Sun.

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Answer: The energy released as thermal energy is 6.5 J

Explanation:

Energy stored by the spider when it relaxes is given by:

\(E_o=\text{Resilience}\times \text{Work}\)

We are given:

Resilience = 0.35

Work done = 10.0 J

Putting values in above equation, we get:

\(E_o=0.35\times 10\\\\E_o=3.5J\)

Energy released at thermal energy is the difference between the work done and the energy it takes to relaxes, which is given by the equation:

\(E_T=\text{Work done}-E_o\)

Putting values in above equation, we get:

\(E_T=(10-3.5)=6.5J\)

Hence, the energy released as thermal energy is 6.5 J

The energy released as thermal energy when 10 J of work is done to stretch silk will be 6.5 J

Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy.

Energy stored by the spider when it relaxes is given by:

\(\rm E_o=Resilience \ \times Work\)

We are given:

Resilience = 0.35

Work done = 10.0 J

Putting values in above equation, we get:

\(\rm E_o=0.35\times 10\)

\(E_o=3.5\ J\)

Energy released at thermal energy is the difference between the work done and the energy it takes to relaxes, which is given by the equation:

\(E_T=\rm Work done -E_o\)

Putting values in above equation, we get:

\(E_T=(10-3.5)=6.5\ J\)

Hence, the energy released as thermal energy is 6.5 J

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Answer:

C. backhand stroke

Explanation:

Your hand will be rotated counterclockwise about a fourth of the racquet handle during this stroke. The correct response is to backhand stroke. Option C is correct.

When playing tennis, a backhand is a stroke in which the player's torso is crossed and the ball is struck with the palm towards the opponent's chest and the back of the hand traveling toward them.

A backhand in tennis can be made with one or both hands.

With this stroke, your hand will be turned about a quarter circle counter-clockwise on the handle of your racquet. Backhand stroke is the right answer.

Hence. option C is correct.

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