What is the flux through any closed surface surrounding a cylinder with surface charge densityσ = k sin φ , where k is a constant. Its height is H , and its radius is R.

Answer: B

Explanation:

Your'e asking about how waves get closer and louder A it isn't moving so no, C it's not saying if it's near or not and D is going trough another procedure so that leaves B behind

Answer:

Choice B) B There is no net force on the hockey puck.

Explanation:

In case when the hockey puck the slides with the same velocity or constant velocity so the force with respect to the hockey should contain that there is no net force as if the body moves along with the same velocity or the constant velocity so in this case the body acceleration is zero

And according to the newton second law i.e.

F = ma

In case when the acceleration is zero so the net force is zero

Therefore the option b is correct

The formation of terrestrial-type planets around a star is most likely to have occurred through a process called accretion, which involves the gradual accumulation of dust and gas in the protoplanetary disk surrounding the star.

Over time, this material clumps together due to gravitational forces, forming larger and larger bodies, eventually leading to the formation of solid, rocky planets like Earth. This process is thought to have taken place over millions of years, and it is believed to be the most common method by which planets are formed in the universe.

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Answer:

C

Explanation:

(C) Positively charged particles moved upward, causing the top of the rod to have a positive charge and the bottom of the rod to have a negative charge.

When a neutral and non-polarized conducting rod moves through a magnetic field, it will experience a force known as the Lorentz force. This force acts on the moving charges within the rod, and causes them to move perpendicular to both the direction of motion and the magnetic field. In this case, since the rod is moving to the right, and the magnetic field is pointing into the screen, the Lorentz force will act upward on the positively charged particles within the rod. This motion will cause a separation of charges in the rod, with the top having a positive charge and the bottom having a negative charge.

Answer:

HOPEFULLY i am correct but i say its D. Hopefully I helped!✨

Answer: It can be A or B

Explanation: In physics, motion is the phenomenon in which an object changes its position over time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and time.

The magnitude of the wave speed is the ratio between the distance of one wavelength and the period. The wave speed formula is the wavelength divided by the wave period or written v = λ/T.

The symbol λ (lambda) is the wavelength that has units of meters (m).

It is given a canoe up and down every 2.5 s. So, the period of a wave is T = 2.5 s

It is given that the average distance between a passing motorboat is 3.6 m. The distance between the crest of the wave is equal to the wavelength.

So, λ = 3.6 m

Then the speed of the wave is

v = λ/T

v = 3.6 m/2.5 s

v = 1.44 m/s

So, the wave is moving at speed of 1.44 m/s.

Wavelength is the length of one peak and one valley in the string which is denoted by lambda (λ). The wave period is the time it takes to travel one wavelength.

Given in the problem that electromagnetic radiation travels at a speed of 3.0 x 10⁸ m/s and frequency of 3.5 x10⁵ Hz, the wavelength is:

λ = v/f

λ = (3.0 x 10⁸) ÷ (3.5 x10⁵)

λ = 857.1 m

X-ray that has a wavelength of 2.5 x 10⁻¹⁰m.

f = v/λ

f = (3.0 x 10⁸) ÷ (2.5 x 10⁻¹⁰)

f = 1.4 x 10¹⁸ Hz

So, the frequency of an x-ray is 1.4 x 10¹⁸ Hz.

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The instantaneous speed of the point of the disk that makes contact with the surface is zero m/s (Option A).

To determine the instantaneous speed of the point of the disk that makes contact with the surface, we must consider the following terms:

The answer to the question is A) zero m/s. The reason for this is that the point of contact between the disk and the surface is stationary for an instant, as it constantly changes due to the rotation of the disk. At that specific moment, the instantaneous speed of the point of contact is zero.

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The correct answer to the given question is -6.944 * 10^-28 Joules

a. To find the electron's initial speed, we can use the conservation of energy. The initial kinetic energy of the electron must equal the final potential energy of the electron at its closest approach to the sphere.

Ki = 1/2 * me * v^2

v = sqrt(2Ki/me)

Ki = qe * V = (1.6 x 10^-19 C) * (-4.4 x 10^-9 C) = -6.944 x 10^-28 J

b. At the point where the speed of the electron is half of its initial value, the kinetic energy of the electron is half of its initial value. Therefore,

Ki/2 = 1/2 * me * (v/2)^2

we can solve for the distance from the surface of the sphere using the same equation as in part a, and substituting Ki/2 and v/2 for Ki and v respectively

c. The acceleration of the electron at its turning point can be found using the equation for centripetal acceleration:

a = v^2/r

where a is the acceleration, v is the speed of the electron, and r is the distance of the electron from the center of the sphere at its closest approach. We can use the value of v from part a and the distance from part b to find the acceleration.

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Answer:

.

Explanation:

Astronauts always wear spacesuits that provide them with a controlled environment, protection from temperature extremes, and a supply of oxygen to survive in space.

The human body in space would be exposed to the vacuum of space, extreme temperatures, and lack of oxygen. Here's what would happen:
1. Vacuum of Space: In space, there is no air pressure. Without a spacesuit, the body's fluids, including saliva and tears, would boil due to the low pressure. This would lead to rapid evaporation of moisture from the skin, causing dehydration.
2. Extreme Temperatures: Space is extremely cold, with temperatures reaching below -270 degrees Celsius. Without proper protection, the body would quickly lose heat, leading to hypothermia. On the other hand, if exposed to direct sunlight, the body would be exposed to intense heat, resulting in burns.
3. Lack of Oxygen: In space, there is no oxygen to breathe. Within a few seconds, a person would lose consciousness due to the lack of oxygen. Eventually, without oxygen, the brain and other vital organs would cease to function, leading to death.

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It is not possible to answer this question without more information about the distance between cities A and D, the distance between A and B, and the range of the station in City A.

What is distance?
Distance is a measurement of the distance apart two objects or points are, either numerically or occasionally qualitatively. Distance can be a physical length in physics or to an estimate based on other factors in everyday language (e.g. "two counties over"). The term is frequently was using metaphorically to refer to a measurement of the distance between two common pieces or even a degree of separation because spatial cognition is indeed a rich source of implicatures throughout human thought. The concept of a metric space is used in mathematics to formalise the majority of these notions of range, both literal and figurative. Distance in the social sciences can refer to different types of separation, including such social or psychological distance.

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a)The magnetic field refers to the region in space where magnetic forces are exerted on magnetic materials or moving charged particles.

b)The magnetic force acting on a wire carrying a current and placed in a magnetic field is given by the equation F = I * L * B * sin(θ), where I is the current, L is the wire length perpendicular to the field, B is the magnetic field strength, and θ is the angle between the wire and the field lines.

c)The angle between the wire and the magnetic field affects the magnitude of the force, with maximum force occurring when the wire is perpendicular to the field and decreasing as the angle decreases, ultimately becoming zero when the wire is parallel to the field lines.

a) Magnetic Field: The magnetic field is a region in space where a magnetic force is exerted on magnetic materials or moving charged particles. It is represented by lines of force or magnetic field lines that indicate the direction and strength of the magnetic field. The strength of the magnetic field is typically measured in units of tesla (T) or gauss (G).

b) Magnetic Force: The magnetic force acting on a wire of length "L" carrying a current "I" and placed in a magnetic field "B" can be determined using the equation:

F = I * L * B * sin(θ)

Where:

F is the magnetic force,

I is the current flowing through the wire,

L is the length of the wire perpendicular to the magnetic field,

B is the magnetic field strength, and

θ is the angle between the wire and the lines of the magnetic field.

The direction of the magnetic force is perpendicular to both the wire and the magnetic field and follows the right-hand rule, which states that if you point your thumb in the direction of the current, and curl your fingers in the direction of the magnetic field, the magnetic force will be in the direction your palm faces.

c) Effect of Angle: The angle between the wire and the lines of the magnetic field, denoted by θ, influences the magnitude of the magnetic force acting on the wire. When the wire is perpendicular to the magnetic field lines (θ = 90 degrees), the force is at its maximum. As the angle decreases, the force decreases proportionally to the sine of the angle (sin(θ)). When the wire is parallel to the magnetic field lines (θ = 0 degrees), the force becomes zero. Therefore, the angle between the wire and the lines of the magnetic field affects the strength of the magnetic force acting on the wire, with maximum force occurring when the wire is perpendicular to the magnetic field lines.

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Answer:

The Vertical initial velocity for a projectile can be zero for an infinite number of cases. The only requirement stands that the initial velocity (velocity at the time we start observing) should be zero, independent of acceleration along that axis or any other perpendicular axis.

Answer:

The voltage drop across each resistance is the same as the applied one. Hence most of the supplied voltage (the electrical energy) reaches the bulb. Hence it glows brighter. Now in the case of series combination of resistors, the effective resistance of the circuit increases.

Explanation: Discuss your theory on why the light bulbs in the combination circuit have

different brightness.

Time Period of revolution of the astreoid around the sun is P = 8\(\sqrt{D^{3} }\) days.

The length of time it takes an astronomical object to complete one orbit around another object is known as the orbital period. In astronomy, it often refers to bodies like planets or asteroids revolving about the Sun, as well as moons circling other stars, exoplanets, and double stars.

In other words, the cube of the semi-major axis of any planet's orbit is equal to the square of the period of that planet's revolution around the sun. Despite the fact that all planetary orbits are elliptical, all save Pluto's are close enough to circular shapes to allow the word "radius" to be used instead of "semi-major axis." In other terms, the cube of a planet's distance from the sun (d) is equivalent to the square of a planet's period (P)

Let the distance of Earth from sun be D km

Distance of Astroid from sun is 4D km

Time taken by Astroid to orbit  sun be P days

Then,

P²= (4D)³

P = 8\(\sqrt{D^{3} }\)

Time Period of revolution  P = 8\(\sqrt{D^{3} }\)   days.

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(a) To determine the temperature of the copper plate, we can use the formula:

Q = m_dot x Cp x (T_out - T_in)

where Q is the heat transfer rate, m_dot is the mass flow rate of water, Cp is the specific heat capacity of water, and T_out and T_in are the outlet and inlet temperatures of the water, respectively.

The heat transfer rate can be calculated as:

Q = 100 x 25 W = 2500 W

The mass flow rate of water can be calculated as:

m_dot = rho x V x A

where rho is the density of water, V is the velocity of water, and A is the area of the plate.

rho = 1000 kg/m³ (density of water)

V = 2 m/s (given)

A = 0.2 m x 0.2 m = 0.04 m² (area of the plate)

Therefore, m_dot = 1000 kg/m³x 2 m/s x 0.04 m² = 80 kg/s

The specific heat capacity of water is Cp = 4186 J/kg-K.The outlet temperature of the water is given as T_out = 17°C = 290 K (approx).

Assuming the copper plate is isothermal, we can equate the heat transfer rate to the thermal energy generated by the components:

Q = 100 x P

where P is the power dissipation per component.

Therefore, P = Q/100 = 25 W

The contact resistance between the component and the copper plate is given as 2 x 10⁴ m² K/W. The contact area between each component and the copper plate is 1 cm²= 0.0001 m².

Using the formula for the thermal resistance of a component:

R_th = 1/(h x A_c)

where h is the heat transfer coefficient and A_c is the contact area, we can calculate the value of h:

R_th = 2 x 10⁴m² K/W

A_c = 0.0001 m²

Therefore, h = 1/(R_th x A_c) = 5000 W/m² K

Assuming the components are at a uniform temperature, we can use the formula for convection heat transfer to calculate the component temperature:

P = h x A_c x (T_plate - T_comp)

where T_comp is the component temperature.

Rearranging the formula, we get:

T_comp = T_plate - (P/(h x A_c))

The temperature of the copper plate is approximately 82.3°C, which can be calculated using the first formula.

Plugging in the values, we get:

Q = 80 kg/s x 4186 J/kg-K x (290 K - T_plate)

Solving for T_plate, we get:

T_plate = 82.3°C

(b) The component temperature can be calculated using the second formula:

T_comp = T_plate - (P/(h x A_c))

Plugging in the values, we get:

T_comp = 82.3°C - (25 W/(5000 W/m² K x 0.0001 m²)) = 57.3°C

Therefore, the temperature of each component is approximately 57.3°C.

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Complete Question

One hundred electrical components, each dissipating 25 W, are attached to one surface of a square (0.2 m × 0.2 m) copper plate, and all the dissipated energy is transferred to water in parallel flow over the opposite surface. A protuberance at the leading edge of the plate acts to trip the boundary layer, and the plate itself may be assumed to be isothermal. The water velocity and temperature are "-= 2 m/s and T-= 17°C, and the water's thermophys- ical properties may be approximated as V 0.96 x 10- m2/s, k-0.620 W/m-K, and Pr-5.2. Copper plate, T, Contact area, Ac and Water resistance, Rin UUUUUUUUUUT?: Boundary ayer trip , L= 0.2 m (a) What is the temperature of the copper plate? (b) If each component has a plate contact surface area 1 cm2 and the corresponding contact resistance is 2 x 104m2. K/W, what is the component tempera- ture? Neglect the temperature variation across the thickness of the copper plate. of

Answer:

a. 165.5 V

b. 7.78 A

Explanation:

Here is the complete question

The RMS potential difference of an AC household outlet is 117 V. a) What is the maximum potential difference across a lamp connected to the outlet? b) If the RMS current through the lamp is 5.5 A, what is the maximun current through the lamp.

Solution

a. The maximum potential difference across the lamp V₀ = √2V₁ where V₁ = rms value of potential difference = 117 V

V₀ = √2V₁ = √2 × 117 V = 165.5 V

b. The maximum current through the lamp I₀ = √2I₁ where I₁ = rms value of current = 5.5 A

V₀ = √2V₁ = √2 × 5.5 A = 7.78 A

In arid climates, most small streams are e. ephemeral,

Small streamsy only flow for a short period of time after rainfall or snowmelt. These streams may not have a defined channel, and the water may spread out over a wide area before eventually evaporating or infiltrating into the ground. Ephemeral streams are an important part of the hydrologic cycle in arid regions, as they contribute to groundwater recharge and provide habitats for aquatic plants and animals.

However, they can also pose a risk for flash flooding during intense rainstorms. Understanding the behavior and characteristics of ephemeral streams is crucial for managing water resources and mitigating the impacts of flooding in arid regions. In arid climates, most small streams are e. ephemeral,

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Answer:

194 kg m²

Explanation:

Use parallel axis theorem:

I = I₀ + mr²

I = 25 kg m² + (1 kg) ((5 m)² + (12 m)²)

I = 25 kg m² + 169 kg m²

I = 194 kg m²

The reading on the scale is equal to the weight of the student which is 646.8 N.

The given parameters;

The reading on the scale is determined by applying Newton's second law of motion as follows;

\(R = ma+ mg\\\\R = m(a + g)\\\\R = m(0 + g)\\\\R = mg\)

The student is at rest and not accelerating, a =0

\(R = 66 \times 9.8\\\\R = 646.8 \ N\)

Thus, the reading on the scale is equal to the weight of the student which is 646.8 N.

The complete question is below:

A 66 kg student stands on a very light, rigid board that rests on a bathroom scale at each end as shown in (Figure 1). what is the reading on the scale?

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Answer:

initial velocity (u)=0

final velocity (v)=80m/s

time(t)=5s

acceleration (a)=?

Explanation:

we have

v=u+at

80=0+a×5

5a=80

a=80/5=16m/s²

After 3.0 seconds, the projectile will have a horizontal displacement of 171 meters and a vertical displacement of 44.1 meters.

When a projectile is fired horizontally, its initial vertical velocity is zero. However, the horizontal velocity remains constant throughout its motion. We can calculate the horizontal and vertical components of displacement after 3.0 seconds using the following equations:

Horizontal component of displacement:

d_horizontal = v_horizontal * t

Vertical component of displacement:

d_vertical = v_vertical * t + (1/2) * g * t^2

Since the projectile is fired horizontally, the horizontal velocity (v_horizontal) remains constant at the initial speed. Thus, the horizontal component of displacement is:

d_horizontal = v_horizontal * t

= (57 m/s) * (3.0 s)

= 171 m

The vertical component of velocity (v_vertical) will increase due to the effect of gravity. Therefore, we need to calculate the vertical component of displacement using the equation:

d_vertical = v_vertical * t + (1/2) * g * t^2

Since the initial vertical velocity is zero, the equation simplifies to:

d_vertical = (1/2) * g * t^2

= (1/2) * (9.8 m/s^2) * (3.0 s)^2

= 44.1 m

Thus, the vertical component of displacement after 3.0 seconds is 44.1 meters.

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Answer:

  4/3 m/s

Explanation:

Assuming momentum is conserved, the sum of products of mass and speed before the collision is the same as after:

  (2000 kg)(4 m/s) +(4000 kg)(0 m/s) = (2000 +4000 kg)(Vt)

  Vt = (8000 kg·m/s)/(6000 kg) = 4/3 m/s

The speed of the combined objects after the collision is 4/3 m/s.

•Question⟿What is meant by solenoid?

•Answer⟿If a conducting wire is wound in form of a cylindrical coil whose diameter is less in comparison to its length, the coil is called a solenoid. It looks like a helical spring.

•Question⟿How does a current carrying solenoid behave?

•Answer⟿

Explanation:

current carrying solenoid behaves as an electromagnet. The uniform magnetic field inside it may magnetise a steel rod permanently. Detailed Answer: A coil of many circular turns of insulated copper wire wrapped closely in the shape of a cylinder is called a Solenoid.

hope it helps you :)

Answer:C car

Explanation:

Answer:

1) Yes the direction of the magnetic field is found based on Fleming's Right Hand Rule

2) The pattern indicates the direction of the magnetic force field lines

Explanation:

1) The solenoid is the is the coil of electric conductor that when it carries an electric current produces a magnetic field

According to Fleming's Right Hand Rule, the direction of the magnetic field produced by a solenoid, depends on the direction of the current such that when the direction of the conventional current is in the direction of the wrapped fingers, the thumb points in the direction of the magnetic field which is North N.

2) The pattern of field lines inside the solenoid indicates the direction of the generated magnetic field moving from left to right within the solenoid as the electric current moves around in the direction shown in the diagram.

Answer:

22.  C.  Pz > Py > Px

23.  B.  5.0 × 10⁴Pa

24.  B.  Upward thrust exerted by the liquid

25.  B.  The volume of the object immersed in the liquid decreases

26.  D.  When a body is wholly or partially immersed it experiences upthrust equal to the weight of the fluid displaced

Explanation:

22. The more you go deeper into the sea, the more the pressure of the water increases pushing down on you.

The reason why salt water is very dense is that when the salt dissolves in the water, it adds to the mass of the water, which makes the water more denser.

Due to this, we can assume that the water pressure exerted on the fish will be greater beneath the sea than the lake at the same depth.

Answer:   C. Pz > Py > Px

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23.

Given:

Density of water = 1000 kg m⁻³

Atmospheric pressure at sea level, Patm = 1.0 × 10⁵ Pa]

Depth of water in sea = 5m

To find the pressure exerted by the water on the fish, we use the formula: P = hpg

P = pressure

h = height or depth of water

p = density of water

g = gravitational field strength

We are given the depth and density, but not the gravitational field strength

Gravitational Field Strength:  Measures how much gravity there is

And since we live on earth, the gravitational field strength is 10 N/kg

Depth, h = 5m

Density, ρ = 1000 kg/m³

Gravitational Field Strength, g = 10 N/kg

Now we substitute these into the formula:

P = hpg

P = (5)(1000)(10)

Multiply 5 and 1000 to get 5000

P = 5000 × 10

Multiply 5000 and 10 to get 50000

P = 50000Pa

      ↓                                                                                                                                                                                                      

P = 5.0 × 10⁴Pa

Answer:   B. 5.0 × 10⁴Pa

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24. When a body is fully or partly immersed in a liquid, it undergoes an apparent loss in its weight due to upward thrust exerted by the liquid.

The upward thrust is the same as the weight of the fluid being displaced by an object.

Answer:   B. Upward thrust exerted by the liquid

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25.

When you add common salt to water it becomes denser, which can increase the mass and volume of the water. Due to water becoming denser, it can make an object thats less dense float. Also, density and volume are inversely proportional to each other, meaning that when density increases, volume decreases.

Answer:   B. The volume of the object immersed in the liquid decreases.

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26.

Achimede's principle states that:

Answer:   D. When a body is wholly or partially immersed it experiences upthrust equal to the weight of the fluid displaced.

Answer:

When two magnets are brought together, the opposite poles will attract one another, but the like poles will repel one another. This is similar to electric charges. Like charges repel, and unlike charges attract.

First, let's calculate the electric force, using the formula below:

Now, let's use the second law of Newton to find the acceleration: