help please I need this
it's about Alfred Nobel

the man who dreamed of a better world

Numerous optical devices, including telescopes, microscopes, binoculars, spectroscopes, and periscopes, among others, employ the phenomenon of complete internal reflection of light.

A diamond's brilliance results from complete internal reflection.

Total internal reflection, which is used in polarising prisms, is significant in fibre optics. Portion of the incoming light will be transmitted and part will be reflected at any incidence angle below the critical angle. The indices of refraction can be used to compute the normal incidence reflection coefficient.

Total internal reflection is a widely used technique in fibre optics. It is used in communications to carry cable TV, internet, and telephone signals. The use of light transmission through fibres is known as fibre optics.

learn more about Total internal reflection refer

https://brainly.com/question/1898899

#SPJ13

The minimum speed that a salmon jumps at an angle of 35.5 degree is 43.3 m/s to leave the water to continue upstream.

What is speed and how it calculated out to be 43.3 m/s ?

To know more about speed visit:

https://brainly.com/question/28224010

#SPJ13

The displacement of the bicycle is 85.3125m

Displacement of the bicycle may be defined as the change in position of the bicycle. It is a vector quantity so that it has direction and magnitude.

We are given that,

The initial velocity of the bicycle = u = 5m/s

The acceleration of the bicycle is = a = 2.5 m/s²

The time taken by the bicycle = t = 6.5 seconds

Therefore, to get the value of displacement of the bicycle by the equation of motion which is written as,

S = ut + (1/2) at²

Where, S is displacement, u is initial velocity, a is acceleration and t is time taken by the bicycle.

Since , putting the values in above equation then we get,

S = {5m/s × 6.5sec} +{ (1/2) × 2.5m/s² × (6.5 sec)²}

S = 32.5 m + 52.8125m

S = 85.3125m

Therefore, the bicycle would be moves 85.3125m

To know more about displacement

https://brainly.com/question/10031457

#SPJ1

Answer: The proportionalities expressed by Newton's universal law of gravitation are represented graphically by the following illustration. Observe how the force of gravity is directly proportional to the product of the two masses and inversely proportional to the square of the distance of separation.

Explanation: I hope this helps : )

The velocity of the falcon and dove in m/s after the impact is 21.95 m/s.                            

Using the data given,

Mass of falcon m₁ = 1.45kg

Mass of dove m₂ = 0.159kg

Initial speed of the falcon x₁ = 23.4m/s

Initial speed of the dove, x₂ = 9.3m/s

It is necessary to find the final velocity after the impact. When the falcon catches the dove, it will becomes the case of inelastic collision. The conservation of momentum will be :

m₁x₁ + m₂x₂ = (m₁ + m₂)V

V = m₁x₁ + m₂x₂/(m₁ + m₂)

V = 1.45*23.4 + 0.159*9.33/1.45+0.159

V = 33.93 + 1.483/1.613

V = 35.413/1.613

V = 21.95

Learn more on velocity from:

https://brainly.com/question/15540076?referrer=searchResults

#SPJ4

When comparing three different ways of having a ball move down through the same height each circumstance, the acceleration varies.

The Earth's mass is what generates gravity. Your body's mass is affected by the combined gravitational pull of all of its mass. That is what gives you authority. If you were on a planet with a lower mass than Earth, you would also weigh less than you do now.

Every object in the universe that has mass is drawn to every other object, regardless of their size or location. Gravity exists whether you are on the Moon, the Earth, or far out in space. Gravity does not require air or an atmosphere to operate.

The acceleration of a body brought on by the force of the earth's gravitational field is known as the acceleration due to gravity, or simply g. This force can be expressed mathematically as mg, where m is the body mass.

To know more about universe :

https://brainly.com/question/9724831

#SPJ9

The force required will be 337.5 N

We have given the mass of the gymnast m = 45 kg

We have to find the force applied to the gymnast so that he can accelerate with the acceleration of 7.50m/sec^2

According to newtons law force on any object is given by F = ma, where m is mass and a is acceleration

So the force on the gymnast will be equal to F = 45×7.50  337.50 N

For acceleration of 7.50m/sec^2, we have to apply a force of 337.5 N

Acceleration is defined in mechanics as the rate of change of an object's velocity with respect to time. The orientation of an object's net force determines the orientation of its acceleration. Newton's Second Law states that the magnitude of an object's acceleration is the result of two causes:

The rate of acceleration is expressed in meters per second squared.

To learn more about acceleration the given link:

brainly.com/question/12550364

#SPJ9

The strength of a gravitational pull increases as the distance between two objects decreases. This is why you experience less gravity at Everest mountain than the sea level.

Gravity is an attractive force between two different objects, which is based n the weight and mass (i.e. physical features) of such objects. Newton developed the law of Gravity by observing the movement of different objects such as apples when they down to the ground from trees.

The attractive gravity forces are also inversely proportional to the distance square between the object subject to this force, thereby gravity is a force that decreases in longer distances regardless of other physical features of such objects and or celestial bodies.

Therefore, we can conclude that gravitational forces are well known to increase as the distance is minor and therefore this value is associated with the separation between objects.

Learn more about gravitational forces here:

https://brainly.com/question/72250

#SPJ1

The minimum radius of the circle is 5249m

The 76kg pilot's effective weight at the bottom of the circle is 5214N

The pilot's effective weight at the top the circle is 3724N

Here's the complete question:

a jet pilot takes his aircraft in a vertical loop.

a) if the jet is moving at a speed of 2000 km/h at the lowest point of the loop, determine the minimum radius of the circle so that the centripetal acceleration at the lowest point does not exceed 6.0g's

b) calculate also the 76kg pilot's effective weight ( the force with which the seat pushes up on him) at the bottom of the circle.

c) calculate the pilot's effective weight at the top the circle. (Assume the same speed.)

a) To determine the minimum radius of the circle so that the centripetal acceleration at the lowest point does not exceed 6.0g's.

v =2000 km/h

v = 2000/3.6 m/s

v = 555.6 m/s

centripetal acceleration, a

a = v²/r

Therefore

6g = v²/r

r = v²/(6g)

r =555.6²/(6*9.8)

r = 5249 m

b) The 76kg pilot's effective weight at the bottom of the circle

   76*(6g + g) = 76*7*9.8 = 5214 N

c) The pilot's effective weight at the top the circle.

    76*(6g-g) = 76*5*9.8 = 3724 N

Learn more about centripetal acceleration from:

https://brainly.com/question/14465119?referrer=searchResults

#SPJ4

x-component of the rabbit's acceleration ax = -0.833m/s

y-component of the rabbit's acceleration ay =  -6.06m/s

Acceleration is the rate of change in both speed and direction of velocity over time. When anything moves faster or slower in a straight line, it is said to have been accelerated. Because the direction is always shifting, motion on a circle accelerates even while the speed is constant.

Along x axis

Vox = velocity along the positive x-direction = 1.50 m/s

Vfx = 0m/s

ax = (Vfx-Vox)/T

ax=(0-1.5)/(1.8)

ax=-0.833m/s

x-component of the rabbit's acceleration ax = -0.833m/s

Along y axis

Voy = 0 m/s

Vfy = velocity along the negative y-axis -10.9m/s

ay=(Vfy-Voy)/T

ay= (-10.9-0)/(1.8)

ay = -6.06m/s

y-component of the rabbit's acceleration ay =  -6.06m/s

To know more about acceleration  visit:

https://brainly.com/question/2303856

#SPJ4

The nervous system in a woman can coordinate the reflex action due  skin receptors sense a stimulus, sensory neurons transmits the electrical impulses, motor neurons address it to the effect, and finally producing a response.

Reflex action can be defined as an involuntary response to different environmental conditions, which are collectively called stimuli. These conditions may lead to a change in the body temperature and they are useful to adapt to a changing environment, which is a fundamental issue in adaptive responses.

The nervous system may manage reflex actions in this system by using specific cell receptors located at the epidermis (skin cells).

Therefore, we can conclude that the reflex action is a coordinated response of the nervous system associated with the detection of environmental stimuli that lead to the activation of effector cells and sensory neurons.

Learn more about the reflex action here:

https://brainly.com/question/894334

#SPJ1

The final velocity of textbook upon being pushed is 0.64 m/s. Thus, [tex]v_{f} = 0.64 m/s[/tex].

Given mass of the textbook, m = 1.4 kg

External force applied to push textbook, F = 6.0 N

Frictional force exerted on book, f = 3.0 N

Initial velocity of textbook, u = 0

Since, The external force applied on the object is more than the total limiting friction exerted on book. Hence, the object moves and friction become Kinetic Friction.

Therefore, F-f = ma

6 - 3 = 1.4 * a

[tex]a= \frac{3}{1.4}[/tex]

[tex]a = 2.1 m/s^{2}[/tex]

Now, to find final velocity of textbook

[tex]v^{2} = u^{2} + 2as[/tex]

where v = final velocity

u = initial velocity

a = acceleration

s = distance travelled by textbook

[tex]v^{2} = 0 + 2*2.1*0.1[/tex]

[tex]v^{2} = 0.42[/tex]

v = 0.64 m/s

Hence, Final velocity of textbook after crossing 1.0m of distance is 0.64m/s.

Learn more about such numerical https://brainly.com/question/26717851

The force of gravity can more easily overcome the force of friction if the ramp is steep. Obviously, gravity causes an object on an incline to move faster down the slope than an object on a flat slope. Because of the increased height, falling takes longer.

Hence, The force of gravity can more easily overcome the force of friction if the ramp is steep.

To learn more about independent variable refer to:

https://brainly.com/question/82796

#SPJ13

The height of the cliff from which the ball fell is 172.3 m.

The time of motion of the ball is the time taken for the ball to travel from its initial position to the final position.

X = Vt

where;

t = X/V

t = (83 m) / (14 m/s)

t = 5.93 s

The height of fall of the ball is calculated as follows;

h = vt +  ¹/₂gt²

where;

h = 0 + ¹/₂gt²

h = ¹/₂gt²

h = ¹/₂(9.8)(5.93)²

h = 172.3 m

Learn more about height of fall here: https://brainly.com/question/15611384

#SPJ1

Answer:

hope it helps

Explanation:

The linear speed is √5 m/s and the angular speed is √5/0.06 rad/s.

We need to know about the conservation of energy to solve this problem. The energy can not be created or destroyed, the only way is to change to another form. It can be written as

Ei = Ef

where Ei is initial energy and Ef is the final energy

From the question above, we know that

R = 0.06 m

h = 0.5 m

The playground slide is converting the potential energy from height to kinetic energy. Hence,

Ei = Ef

PE = KE trans + KE rot

m . g  . h = 1/2 . m . v² + 1/2 I . ώ²

m . 10  . 0.5 = 1/2 . m . v² + 1/2 m.R² . ώ²

5 = 1/2(v² + R² . ώ²)

10 = (v² + R² . v²/R²)

2v² = 10

v = √5 m/s

v = ώ . R

√5 = ώ . 0.06

√5 = ώ . 0.06

ώ = √5/0.06 rad/s

Find more on conservation of energy at: https://brainly.com/question/166559

#SPJ4

It should be noted that after the big bang occurred, the universe "Became Denser" (Option B)

According to the Big Bang Theory, after the explosion which triggered the transformation of radiation into matter, gravity pulled dark matter together which in turn attracted normal matter.

Hence, it is right given the above analogy that the Universe became denser.

It should be mentioned that the big-bang hypothesis is a widely accepted account of the universe's evolution. Its defining characteristic is the universe's birth from a condition of great heat and density—the so-called big bang, which occurred 13.8 billion years ago.

Learn more about the Big Bang Theory:
https://brainly.com/question/24453703

#SPJ1

Answer:

A. Is the bow made by hand?

Explanation:

Hope this helps.

V=1160*24S/3750 + 2590*16E/3750 is the final velocity.

Given,

An 1160 kg car traveling south at 24.0 m/s

A 2590 kg delivery truck traveling east at 16.0 m/s gets collided and attached to the car.

Solution:

The momentum is conserved here

1160*24 S + 2590*16 E =(1160+2590)V

V = 1160*24 S + 2590*16 E/3750

V=1160*24S/3750 + 2590*16E/3750

The final velocity is V=1160*24S/3750 + 2590*16E/3750.

To learn more about velocity, refer

https://brainly.com/question/25749514

#SPJ9

The Electric Field of the capacitor is given by E = q/kaε, Voltage is given by V = qd/kaε and the capacitance is given by kaε/d.

The magnitude of charge on each plate is given by q, area between the plates is given by a, dielectric constant is given by k, distance between the plates is d. The area of the enclosed charge 'a' is given by

q(enclosed) = σa(q/a)a, where σ is surface charge density given by q/a.

Now, according to gauss law, E = q/kaε.

Since, voltage = Electric field × Distance

V = E×d

V = (q/kaε)×d

V = qd/kaε

Now, the capacitance = Charge/Voltage

C = q/V

C = q/(qd/kaε)

C = kaε/d.

Thus, the value of Electric Field, Voltage and Capacitance are E = q/kaε, V = qd/kaε and C = kaε/d respectively.

Learn more about Electric Field at:

brainly.com/question/27752270

#SPJ9

Complete Question

A parallel-plate capacitor has the volume between its plates filled with plastic with dielectric constant K. The magnitude of the charge on each plate is Q. Each plate has area A, and the distance between the plates is d.1. Use Gauss's law to calculate the magnitude of the electric field in the dielectric.2. Express your answer in terms of the given quantities and appropriate constants.3. Use the electric field determined in part A to calculate the potential difference between the two plates.4. Express your answer in terms of the given quantities and appropriate constants. Use the result of part B to determine the capacitance of the capacitor.5. Express your answer in terms of the given quantities and appropriate constants.

1. 55 km is distance the car travel on the trip.

Net distance = final distance - initial distance = 155 - 100 = 55km.

2. 110 km/hr is would be the average speed of the car in the question above if the trip took half an hour.

Average speed  = distance travelled/ time =  55km/0.5hr

Hence, average speed = 110km/hr

The average speed is the full distance traveled with the aid of the object in a particular time interval. The average speed is a scalar quantity. it is represented via the significance and does not have path. average pace is calculated by way of dividing distance through time.

Speed is the directional pace of a object in movement as a demonstration of its price of alternate in role as discovered from a selected frame of reference and as measured by way of a particular trendy of time.

Learn more about average speed here;- https://brainly.com/question/24739297

#SPJ1

The resultant velocity of the boat would be 22.11  meters/second northeast.

What is Velocity?

Velocity is the overall distance an object travels in a given amount of time.

As stated in the question that A boat crosses a river heading north at a speed of 22 meters per second relative to the water. To get the board's resulting velocity, we should know the river's eastward velocity, which is 2.2 meters per second.

velocity of the river = 2.2 meters/second to the east

velocity of the boat = 22 meters/second

The resultant velocity of the boat = √(22² + 2.2²)

                                                         = 22.11  meters/second.

Thus, The boat's final velocity would be 22.11 meter/second towards northeast.

To learn more about velocity visit the link:

https://brainly.com/question/18084516?referrer=searchResults

#SPJ9

The advice the interviewee offered for students interested in his/her career was to be hardworking and persistent.

This is referred to as the chosen profession or occupation of an individual and is characterized by the individual taking the required courses or training which are needed in the execution of the tasks related to it.

The advise which was offered to the students was to be hardworking and persistent as there are lots of challenges and obstacles which one will face on the journey and will help overcome them and achieve the desired result in practicing the career.

Read more about Career here https://brainly.com/question/1199865

#SPJ1

The youngest is Calliope.

To learn more about : Spiral galaxies

Ref : https://brainly.com/question/13956361

#SPJ13

The ratio of the masses is m1/m2.In terms of some or all of the variables a, μ, and θ, as well as the magnitude of the free-fall acceleration g.

m1/m2 = a+g(sinθ+μcosθ)/g−a

Acceleration describes the speed and direction changes in velocity over time. Acceleration refers to the change in speed or direction of an item or points traveling straight forward. Due to the constant change in direction, motion on a circle accelerates even while the speed is constant.

To be a vector quantity, acceleration must have both a magnitude and a direction. As a vector quantity, velocity is also. A time interval's velocity vector change divided by that interval's duration is the definition of acceleration. The limit of the ratio of the change in velocity over a certain period to that period as that period approaches zero is used to determine instantaneous acceleration.

Learn more about acceleration here:

https://brainly.com/question/12550364

#SPJ4

Since they are connected in series, the current in ampere through each lamp will be  0.01 A approximately. None of the options is correct.

Electrical power is the rate at which electrical work (or electrical energy) is done. It is measured in Watt.

Given that twelve identical 2 W light bulbs are connected in series to a 240 V mains supply. The current in ampere through all the lamp will be the same because they are connected in series.

Power P = IV

Where

Substitute all the parameters into the formula.

2 = I × 240  

I = 2 / 240

I = 0.0083 A

Therefore, the current in ampere through each lamp is 0.0083 A

Learn more about Electrical Power here: https://brainly.com/question/60890

#SPJ1

        According to the parallelogram rule, if two vectors are placed with the same initial point and then completed into a parallelogram, the directed diagonal that begins at the same position as the vectors equals the sum of the two individual vectors.

      A quadrilateral with opposite sides that are parallel and equal is known as a parallelogram. The interior opposite angles of it are equal. Additionally, the transverse angles on the same side must add up to 180 degrees or be complementary to one another.

      A unique variety of quadrilateral in which the opposing sides are parallel   and equal is known as a parallelogram. The length of each side added together makes up a parallelogram's perimeter, which may be computed using the following formula: Perimeter is equal to 2(a + b), where a and b are the parallelogram's two sides.

      In a parallelogram, the opposing sides are parallel to one another and have equal measurements. In a parallelogram, the opposing angles are equal. A parallelogram's internal angles add up to 360 degrees. A parallelogram's subsequent angles must be supplementary (180°).

     There are several related theorems, such as opposite sides are congruent, opposite angles are congruent, a parallelogram's diagonals bisect one another, and rectangles are parallelograms with congruent diagonals.

To Learn more About Parallelogram rule, Refer:

https://brainly.com/question/28761473

#SPJ9

The drift velocity increases from A to B and decreases from B to C.

A drift velocity in physics is the average speed that charged particles—like electrons—achieve within a material as a result of an electric field. An electron will typically move randomly across a conductor at the Fermi velocity, producing an average velocity of zero. Applying an electric field causes a little net flow in one direction to be added to this random motion; this is the drift. Free electrons gain velocity in the direction opposite the electric field between collisions when a potential difference is applied across a conductor (and lose velocity when moving in the direction of the field), acquiring a velocity component in that direction in addition to their random thermal velocity.

To know more about drift velocity refer to https://brainly.com/question/25700682

#SPJ9

Answer:

C. 2.5 g/ml

Explanation:

Divide mass by volume