if observations of supernovae in other galaxies show that such an explosion happens in a spiral galaxy like the milky way on average every 25 to 100 years, why have astronomers on earth not seen a supernova explosion in our galaxy since 1604?

Resistivity is the measure of an electrical conductor's resistance with a unit cross-sectional area and unit length. Any material's resistance can be used to distinguish it from other materials and to assess how well they carry electric currents. High resistance suggests little conductivity.

"The wire's resistivity changes, but its resistance does not,"

Stretching a copper wire causes its length to rise and its diameter to contract, which raises the wire's resistance but keeps the material's and temperature's resistivity constant.

The resistance of current in a wire is inversely related to the cross-sectional area of the wire and directly proportional to its length. This is,

R = (L rho)/A

Where

L stands for wire length.

A is the wire's cross-sectional area.

Resistivity, or rho, is a proportionality constant that is influenced by the wire's quality.

In light of this, resistance and resistivity are connected by:

proportionality constant based on the composition of the substance.

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0.44 is the coefficient of friction between the box and the floor.

F=μN

F= force

N= Normal reaction

μ=coefficient of friction

F=μN

μ=F/N

μ=34.2/7.87 ×9.8

μ= 0.44

The ratio of the normal force pushing two surfaces together to the frictional force preventing motion between them is known as the friction coefficient. Usually, the Greek letter mu is used to indicate it .N is the normal force, and F is the frictional force, hence F = N/N.

Due to the fact that both F and N are measured in units of force, the coefficient of friction has no dimensions (such as newtons or pounds). The coefficient of friction can have a variety of values for both static and dynamic friction. Static friction occurs when an object encounters friction that resists any applied force, keeping the object at rest until the static frictional force is released. In kinetic friction, the frictional force resists the motion of the object.

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The total momentum before the person moves is zero when he walks in a straight line to the opposite end of the raft.

According to Newton's second rule of motion, the rate of change of body's momentum is equal to the net force acting on it. Momentum changes with frame of reference, but it is a conserved quantity in any inertial frame, which indicates that if a closed system is not impacted by external forces, its total linear momentum remains constant.

Because the initial momentum was zero, the final momentum must also be zero. If the boy has momentum in one direction, the boat must have momentum in the other. The total momentum before the person moves is zero when he walks in a straight line to the opposite end of the raft

As a result, the boat moves backward.

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The distance of the plates apart is 0.029 m.

We know that the electric potential has to do with the energy that is required to move a unit positive charge from one point to another in the electric field.

Now we have the following parameters from the questions;

Voltage applied = 125 V

Electric field = 4.25 × 103 N /C

Distance apart = ??

Now we know that we have to use the formula that says;

E = V/d

E = Electric field

V = Voltage applied

d = Distance apart

When we make d the subject of the formula;

d = V/E

d = 125 V/4.25 × 10^3 N /C

d = 0.029 m

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By bring their legs close to their bodies, they are decreasing the length of the pendulum which help them move more quickly.

A pendulum is nothing but a body suspended from a fixed point so that it can swing back and forth under the influence of gravity.

Here in this case Gibbons are bringing their legs close to their bodies and reducing the length of the pendulum. Since as the length of the pendulum increases the speed of the movement will be reduced. By bringing their legs close to their bodies they are reducing the length and in turn their speed increase and they move quickly.

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Option d is correct.

2 spring tides and 2 neap tides will be experienced by the tide-recording station in a given month.

Tides are the rise and fall in sea levels brought on by the combined effects of the Moon's (and the Sun's, to a much lesser extent) gravitational pulls, as well as by the Earth and Moon circling one another. The monthly tides on Earth are influenced by the gravitational pull of the moon and the sun together.

The solar tide adds to the lunar tide when the sun, moon, and Earth are aligned (during a new or full moon), resulting in extremely high tides and extremely low tides, both of which are known as spring tides.

The solar tide largely cancels out the lunar tide one week later when the sun and moon are at right angles to one another, resulting in the mild tides known as neap tides. Two sets of spring tides and two sets of neap tides take place twice each lunar month.

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This statement is True. The magnitude of the frictional force is always equal to μkn.

Frictional force refers to the pressure generated via two surfaces that touch and slide toward every other. a few factors affect the frictional pressure: those forces are specifically stricken by the surface texture and the amount of pressure impelling them together.

Friction can gradually things down and prevent desk-bound matters from shifting. In a frictionless global, extra gadgets would be sliding about, clothes and footwear might be difficult to keep on and it might be very difficult for human beings or vehicles to get shifting or change direction.

using lubricants such as oil or grease can reduce the friction between the surfaces. by using polishing the floor, sprucing makes the floor easy and friction may be decreased.

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As the age of the car increases by 1 year, the value of the car decreases by 7%.

What is velocity?

Velocity is the directional velocity of a moving object, observed from a given frame of reference and indicating the rate of change of position measured at a given time reference (eg 60 km/h northward). Velocity is a fundamental concept in kinematics, a branch of classical mechanics that describes the motion of bodies.

Velocity is a physical vector quantity. The scalar absolute value (magnitude) of velocity is called velocity, and its magnitude is a consistent derived unit measured in the SI (metric) system as meters per second (m/s or m⋅s−1). For example, "5 meters/second" is a scalar, but "5 meters/second east" is a vector. An object is said to be accelerating if its velocity, direction, or both change.

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The speed of the fighter jet the instant after it launches the missile is 352.36 m/s.

The final speed of the fighter jet is the speed of the fighter jet after launching the missile.

Apply the principle of conservation of linear momentum;

m₁u  +  m₂u   =  m₁v₁   +   m₂v₂

where;

u(m₁ + m₂) = m₁v₁ + m₂v₂

365(12,652 + 190) = 12,652v₁  +  190(1207)

4,687,330 =  12,652v₁  + 229,330

12,652v₁ = 4458000

v₁ = 4458000 / 12,652

v₁ = 352.36 m/s

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Yes, This icosahedrons geometrical form can be distorted as a lower pyritohedral symmetry.

An icosahedron is a polyhedron with 20 faces. it has no.of edges=30and no. of  Vertices=12.it is a geometrical shape.

A 3D spherical symmetry group with the symbol B3/2 is called pyritohedral symmetry, also referred to as pyritic symmetry. The pyritohedral icosahedron and its dual pyritohedron make up this symmetry group.

Snub octahedrons, snub tetratetrahedrons, snub tetrahedrons, and pseudo-icosahedrons are all names for conventional icosahedrons that have been deformed or marked up as having a lower pyritohedral symmetry. An alternating truncated octahedron can be seen in this.

Hence , This icosahedrons  geometrical form can be distorted as a lower pyritohedral symmetry

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Therefore, the ball's speed is 2.24 m/s 2.24 m/s. The weight of the ball caused by the earth's gravity is the force exerted on it at any point along the journey.

Take a look at the ball's free-body diagram from both its top and bottom positions in the circle. When a body is suspended from items like chains, cables, strings, etc., tension is simply the drawing force at work on the body. The direction of a body or object's movement is defined by its velocity. In its basic form, speed is a scalar quantity. In essence, velocity is a vector quantity. It is the speed at which distance changes. It is the displacement change rate.

Centrifugal force in the string is given by

F= rmv2

v2= mFr

​v2= 0.25/25×1.96

​ =196

v= 196

​ =14m/s

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An elastic collision is a collision wherein there may be no net loss in kinetic energy in the machine due to the collision. every momentum and kinetic power are conserved quantities in elastic collisions.

An elastic collision is a come among bodies in which the overall kinetic power of the two bodies stays identical. In an ideal, perfectly elastic collision, there may be no internet conversion of kinetic strength into other kinds which includes heat, noise, or capacity electricity.

Elastic collisions arise whilst both the momentum and kinetic energy are conserved, just like how billiard balls bounce off each different and move at the same speeds as earlier. Inelastic collisions appear whilst simplest the momentum is conserved but not the kinetic power.

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A force of 12.94 N is used to move a ball 100 M. Given amount of work done is 1294 joules.

Work in physics is the energy that is transferred to or from an item when a force is applied along a displacement. In its simplest form, it equals the product of the force's magnitude and the distance traveled for a constant force directed in the direction of motion.

Given in the question a work of  1294 joules is used to move a ball 100 M  then,

Work = force x distance. In units, Joules = Newtons x meters.

So, 1294  = F Newtons x 100 meters

Force , F  = 12.94 joules.

A force of 12.94 N is used to move a ball 100 M. Given amount of work done is 1294 joules.

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The lens does have an outer radius of 1.65 cm or an inner radius of 5.85 cm, with an index of refraction of 1.50. then f=20cm is the focal length.

Between lens & glass, lens is the preferred spelling, whilst lense is an error. A lens can be a piece of bent glass or plastic, a component of a camera, or even the clear portion of your eye. Lense, on the other hand, is merely a typo and not a real word.

In optics, a lens is a piece of glass or another transparent material that focuses light from an object to create an image of it.

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Answer:

Explanation:

kinematics

d=V1*t + 1/2* a * [tex]t^{2}[/tex]

plug in your knowns into the above equation

d=40*2+1/2*(-9.8)*[tex]2^{2}[/tex]

60.4m

Vf = Vi+ a*t

Vf = 40 + (-9.8)*2

Vf = 20.4 m/s

The correct answer is it will continue to be zero in case of emf when the current is constant at its higher value.

What is the relation emf and current?

The term "induced electromotive force" (EMF) refers to the potential difference that is produced when a coil's magnetic flux changes. The pace at which electrons or ions flow in a closed circuit is known as current, in contrast.

The emf across an inductor is zero whenever the current is constant(unchanging), large or small.

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Answer: The force is less to move a ping pong ball than a bowling ball because the ping pong ball is light while the bowling ball is heavy.

The force required to move a ping pong ball is less than the force required to move a bowling ball.

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.

The force is less to move a ping pong ball than a bowling ball because the ping pong ball is light while the bowling ball is heavy.

The force required to move a ping pong ball is less than the force required to move a bowling ball.

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The solid sphere goes the least distance up its incline.

How do you define the moment of inertia of a body?

                                                         I = L/ω

I = inertia

L = angular momentim

ω = angular velocity

In the question it is given that a solid sphere, solid cylinder, a spherical shell and a hoop all having the same mass(m) , radius(r) and linear center of mass speed(v) roll up identical inclines

Since all the bodies have same mass, radius and linear speed as such according to conservation of energy for every object,

Rotational Energy + Kinetic Energy = Potential Energy

Iω^2/2 + mv^2/2 = mgh

where, the symbols represent-

I = moment of inertia

ω = angular speed

v= linear speed

m = mass

h = height

We know the

I for solid sphere = 2mr^2/5

I for solid cylinder = mr^2/2

I for spherical shell = 2mr^2/3

I for hoop = mr^2/2

As per the given informations kinetic energy of all bodies is same therefore, on the value of I or the moment of inertia depends which body will cover the highest or least distance up its incline

I for solid sphere is minimum among all the given bodies and thus it will attain the least distance.

Hence, the solid sphere goes the least distance up its incline.

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3.710^-15 joule  is the maximum energy of the photons

voltage= 23.5 = 23500 V

q= 1.6 × 10^-19 coulombs

Energy= qV

E= 3.710^-15 joule

Energy is the ability to perform work in physics. Different shapes, such as potential, kinetic, thermal, electrical, chemical, radioactive, etc., may be assumed by it. Other instances of energy being transmitted from one body to another include heat and work. Energy is always distributed after it has been transferred in accordance with its type. Thus, heat transfer could result in thermal energy, whereas work could result in mechanical energy.

Motion is a trait shared by all forms of energy. For instance, if a body is moving, it possesses kinetic energy. Due to the object's design, which integrates potential energy, a tensioned object, such a spring or bow, has the ability to move even when at rest.

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Only twice as far away from the solar system as the Alpha Centauri system, which is the closest star system to us beyond the Sun, it is 8.6 light-years away.

The Greek word that inspired its name means "sparkling" or "scorching." At a speed of just over 186,000 miles per second, light moves through space. Light from the moon's surface must travel more than one second (about 1.3 seconds) to reach Earth because the moon is only around 250,000 miles away.

Time = 8.61 years = 8.61 8760

= 75423.6 hours

Speed of light = 3108 m/s

= 3108 3.6 = 1080000000 Km/h

Dimension =?

Distance x time speed

75423.6 / 1080000000 = distance

multiply by cross

Distance = 75423.6 1080000000

Distance = 8.15*10¹³ kilometers

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Hydropower is the source of renewable energy that contributed the most to 12% of the electricity generated in the United States in 2012.

Hydropower, also known as hydroelectric power, is one of the earliest and most significant forms of renewable energy. It uses the water's natural flow to generate electricity. Currently, 32% of all renewable electricity produced in the US and around 12% of all electricity produced in the country comes from hydropower.

Energy that comes from sources that quickly replenish themselves is referred to as renewable energy. Most of the time, clean energy, or energy that emits few greenhouse gases or pollutants, is also provided by renewable energy sources.

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Answer:

Any amount of force

Explanation:

Any amount of force will overcome inertia, assuming that overcoming inertia means changing the velocity of an object. Looking at Newton's 2nd law: F=m*a, any force applied to a constant mass must effect an acceleration.

If overcoming inertia entails altering an object's velocity, then any amount of force will do it. By applying a force on a mass that is constant, as stated by Newton's second law: F=m*a, an acceleration results.

You only need to know the equation F=ma to comprehend how force overrides inertia; take note that a stands for acceleration, which is the change in speed. Therefore, any net force will cause some acceleration, regardless of how much mass there is or how little force there is. All objects have the propensity to resist changes in motion, which is known as inertia. Unless a force acts on a moving object to modify its speed or direction, inertia causes it to continue traveling at the same velocity (speed and direction). Additionally, it keeps an object in rest still.

The "sum of the product of mass" of each particle with the "square of its distance from the axis of rotation" is the formula for the moment of inertia.

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53.64 m is the shortest distance you can stop an automobile by locking the brakes.

The resistive force of friction (Fr), which pushes the objects together, is divided by the normal or perpendicular force (N), which pushes them apart, to produce the coefficient of friction (fr), which is a numerical value. The following formula represents it: fr = Fr/N.

Given;

kinetic friction coefficient is 0.80.

automobile's speed, u = 28.7 m/s

Applying the following equation, we can determine the shortest distance over which an automobile can be stopped by locking the brakes:

v² = u² + 2ax

First, we establish a;

the second law of motion, Newton

v² = u² + 2ax

First, we establish a;

the second law of motion, Newton

F = ma

F is the amount of kinetic friction preventing the car from moving

-F = ma

but, -F = -μN

-μN = ma

-μmg = ma

-μg = a

- 0.8 x 9.8 = a

-7.84 m/s² = a

Add the value of a to the equation above now

v² = u² + 2ax

F = ma

F is the amount of kinetic friction preventing the car from moving

-F = ma

but, -F = -μN

-μN = ma

-μmg = ma

-μg = a

- 0.8 x 9.8 = a

-7.84 m/s² = a

Add the value of a to the equation above now

v² = u² + 2ax

When the car comes to a stop, its final speed is v = 0.

0 = 28.7² + 2(-7.84)x

0 = 823 - 15.68x

15.68x = 823

x = 823 / 15.68

x = 52.48 m

Therefore, 52.48m is the shortest distance you can stop an automobile by locking the brakes.

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Purple LED lights are very effective at helping plants grow.

What is an LED lamp?

An LED lamp, often known as an LED light bulb, is a type of electric light that emits light by employing light-emitting diodes (LEDs). LED lamps are substantially more energy-efficient than identical incandescent bulbs and can outperform most fluorescent lamps. The most efficient LED bulbs on the market have efficiency of 200 lumens per watt (Lm/W). Commercial LED bulbs have a far longer lifespan than incandescent lamps. To function from mains power lines, LED lights require an electronic LED driver circuit, and losses in this circuit mean that the lamp's efficiency is lower than the efficiency of the LED chips it utilizes. To be compatible with light dimmers designed for incandescent lamps, the driver circuit may require additional characteristics.

Purple LED lights are quite good in assisting plant growth. Because red and blue wavelengths of light, which are included in many LED grow lights, have been discovered to be crucial in promoting plant development, utilizing purple LED lights isolates these two hues to optimize the advantages of your grow light.

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To learn the magnitude and gravitational force to calculate the distance.

What is magnitude?

The most straightforward way to define magnitude is "distance or quantity." In either an absolute or relative sense, it displays the size or motion of an object. It serves as a way to convey the size or scope of something. Magnitude typically refers to a size or length.

What is gravitational force?

Newton's universal law of gravitation states that the force of attraction between any two bodies is inversely proportional to the square of the distance between them and directly proportional to the product of their masses.

G is the gravitational constant 6.67 × 10^-11 Newtons kg-2 m2.

M is the mass of the first object

m is the mass of the second object

r is the distance between them.

In this question.

two g-kg masses are separated by 5 meters.

So F=G(5kg)(5kg)/(5^2)=6.67*10^-11 (newtons)

Therefore, the gravitational force between two 5.0-kilogram masses separated by a distance of 5.0 meters is 6.67*10^-11 (newtons).

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The correct answer of Brewster’s angle is 48.8 degrees for light traveling in water that is reflected from crown glass.

What is light's Brewster angle as it travels through water?

Brewster's law is the name of this equation, and the angle it defines is known as Brewster's angle. Brewster's angle for visible light is around 56° for a glass medium in air (n2 = 1.5), while it is roughly 53° for an air-water interface (n2 = 1.33)

The inverse tan of n 2 over n 1 is what is known as Brewster's Angle. Therefore, 48.8 degrees is the inverse tan of 1.52 divided by 1.33.

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If the object is now moved to a new position 27.0 cm from the mirror, the new image located as measured from the mirror is 10.6 cm

1/p + 1/q = 1/f

so 1/p1 + 1/q1 = 1/p2 + 1/q2

 1/19 + 1/12.7 = 1/27 + 1/q2

  q2 = 10.6 cm

B.  f = -16.2 cm

   q = - 11.7 cm

   (object is formed behind the mirror that means image is virtual and for virtual image, image distance will be negative)

 1/f = 1/p + 1/q

  1/(-16.2) = 1/(-11.7) + 1/q

   q=  42.1 cm

In physics, an object is a recognisable grouping of matter that can be contained by a recognizable boundary and that can move together by translation or rotation in three dimensions. An image is the point at which light rays emanating from an object come together or appear to come together after reflection or refraction. According to this definition, an "object" is anything from which light rays emanate.

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Number of Fluid ounces in 3 Liters of water is approximately 101.

Volume of water = 3 Liters

Volume of water (in milliliters) = 3 x 1000 = 3000 ML

The volume of water in 1 ounce = 29.6 ML

Number of ounces in 3000 ML  = [tex]\frac{3000}{29.6}[/tex]

                                                     =  101.35 ounces

                                                     ≈ 101 ounces

Therefore, there are 101 fluid ounces in 3 liters of water and option

B is the correct choice.

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I would say D

Explanation:

The strength of gravity between two objects depends on two factors: the masses of the objects and the distance between them.

If two objects, one with a mass of 1000 kg and another with a mass of

2500 kg are separated by a distance of 100 m, and the force between

them is 1.667 * 10⁻⁸ N.

The force, F, between two masses separated by a distance, d, is given by the formula below:

F = Gm₁m₂ / d²

where;

G is gravitational constant = 6.67 * 10⁻¹¹ Nm²/kg²

m₁ is the mass of the first object = 1000 kg

m₂ is the mass of the second object = 2500 kg

d is distance = 100 m

The force will then be;

F = 6.67 * 10⁻¹¹ * 1000 * 2500 / 100²

F = 1.667 * 10⁻⁸ N

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