(c)Light is incident in a glass material which is to be used to construct a fibre optic cable. If the critical angle is 25°,what is the refractive index?
​

The question is about a block of mass m sliding down an inclined plane and its kinetic energy at the bottom. The correct answer is (C) mgh−Fs.

The following forces are at work on the block as it descends the slope:

1. The gravitational force (mg), which exerts downward pressure vertically.

2. Force that acts perpendicular to the inclination is called the normal force (N).

3. the resistance to the block's motion is caused by the force of kinetic friction (F), which acts perpendicular to the inclination.

As the block slides down the inclined plane, it gains kinetic energy due to the conversion of gravitational potential energy (mgh) into kinetic energy. However, the force of kinetic friction (F) opposes the motion, and therefore, some of the potential energy is lost as work is done against the friction force over the length s of the incline (Fs). So, the net kinetic energy of the block at the bottom of the incline is the initial potential energy minus the energy lost to friction: mgh−Fs.

To know more about the gravitational force, click here;

https://brainly.com/question/29190673

#SPJ11

the change in direction of a wave passing from one medium to another caused by its change in speed this is from my study guide hope that helps

example: when you are sitting in a pool and ur leg looks deformed or even cut in half its caused my refraction.

D. The efficiency of the ramp is 54.6 %.

V.R = distance moved by effort/distance moved by load = L/h

V.R = (6.12)/(1.53) = 4

M.A = Load/Effort

M.A = (451 x 9.8)/(2025)

M.A = 2.183

E = (M.A / V.R) x 100%

E = (2.183 / 4) x 100%

E = 54.6 %

Thus, the efficiency of the ramp is 54.6 %.

Learn more about efficiency here: https://brainly.com/question/15418098

#SPJ1

Answer:

Distance = speed*time = (52/1.6)*0.25 = 8.125miles

Explanation:

(52/1.6)*0.25 = 8.125miles

The stock helical-coil compression spring has 14 coils, squared and ground ends, a free length of 1.25 inches, and an outside coil diameter of 7/16 inches.

A stock helical-coil compression spring refers to a type of spring commonly available for purchase. In this case, the spring has 14 coils, indicating the number of turns the wire takes to form the spring. The ends of the spring are squared and ground, which means they have been cut or shaped to have a flat, square surface. This design facilitates better contact and stability when the spring is in use. The free length of the spring is 1.25 inches, which is the length of the spring when it is not under any compression or tension. The outside coil diameter is 7/16 inches, indicating the diameter of the entire spring when measured from the outer edge of one coil to the outer edge of the opposite coil. These specifications provide essential information about the physical characteristics of the stock helical-coil compression spring.

Learn more about compression here:

https://brainly.com/question/13320823

#SPJ11

Answer:

the answer is 173 m/s

Explanation:

the the sound traveled from the dog to the building and back to the dog in 0.5 seconds, every second passes the sound travels 346 m/s but if half a second passes then we divide 346 by 2 and get 173 m/s.

Given:

The angle of incidence is,

The refractive index of the crown glass for red light is,

The refractive index of the crown glass for blue light is,

To find:

The angle separating rays of the two colours in a piece of crown glass

Explanation:

We know, Snell's law,

For, the red light,

For, the blue light,

The separation between the refracted rays is,

Hence, the required separation is 0.1 degrees.

Answer:

5

Explanation:

"Par 3" means that the player is expected to complete the hole with three throws. If you are two over par, that means it took you two extra throws to finish the hole.

The ball will hit the ground with a speed of 12 m/s.

Acceleration is the rate of change of velocity over time. It is the rate at which an object's speed or direction changes. Acceleration can be speeding up, slowing down, or changing direction. It can be positive, negative or zero. Positive acceleration is when an object speeds up, negative acceleration is when an object slows down and zero acceleration is when an object is moving at a constant speed. A force is needed to cause acceleration. Examples of forces that cause acceleration are gravity, friction, and applied forces.

This is due to the fact that the speed of an object under the influence of gravity is constantly increasing, so that after 4 seconds of free-fall the ball will have accelerated to a speed of 12 m/s (3 m/s multiplied by the square root of 4, which is 2).

To learn more about acceleration
https://brainly.com/question/605631
#SPJ4

Answer:

A) Kinetic energy and gravitational energy

Explanation:

The blimp has kinetic energy, because it is moving. When it circles the event, it gains and uses kinetic energy. It also has potential energy because it has the potential to go a lot faster, and because it has so much stored energy and pressure.

Hope this helps!

Answer:

the average speed of the swimmer is 0.069 m/s.

Explanation:

Given;

complete distance around the park pine, d = 25 m

total lap completed, = 20 laps

time of laps completion, t = 7200 s

The total distance completed by the swimmer = 20 x 25 = 500 m

The average speed of the swimmer = distance / time

                                                            = (500 m) / (7200 s)

                                                            = 0.069 m/s.

Therefore, the average speed of the swimmer is 0.069 m/s.

Initial momentum is P1 = m1v1 = 19.6 N × 20.0 m/s = 392 kg·m/s;The net force applied to the object is 6.00 N, and it is applied in the direction of its motion, which means the force and displacement are parallel.

Thus, we can use the impulse-momentum theorem to calculate the change in momentum:

ΔP = FΔt = (6.00 N)(4.00 s) = 24.0 N·s;

The final momentum is equal to the initial momentum plus the change in momentum:

P2 = P1 + ΔP = 392 kg·m/s + 24.0 N·s = 416 kg·m/s.

An object with a weight of 19.6 N moves with a constant velocity of 20.0 m/s.

A net force of 6.00 N is applied to the object in the direction of its motion for 4.00 seconds. The final momentum of the object is 416 kg·m/s.

To learn more about Initial momentum

https://brainly.com/question/13778758

#SPJ11

The aspect of training that requires additional emphasis when the aim is to improve change of direction ability is reactive strength.

Reactive strength refers to the ability to rapidly change direction, accelerate, and decelerate in response to external forces, such as an opponent's movements. By focusing on reactive strength training, athletes can improve their ability to change direction quickly and efficiently, which can enhance their overall performance on the field or court. While strength, eccentric strength, and rate of force development are also important aspects of training, reactive strength is particularly crucial for improving change of direction ability. This is because reactive strength focuses on the ability to quickly switch from eccentric to concentric contractions, allowing for better change of direction performance.

learn more about accelerate Refer: https://brainly.com/question/24262534

#SPJ11

Answer:

100

Explanation:

Answer:

Lemme think rq

*inserts writing noises*

*insert intese thinking*

*insert big brain moment*

Well the weight IS 2.3 kg so I think the weight of a squirrel is 2.3 kg

Answer

The cars on the higher track travel

✔ farther than

the cars on the lower track, in the same time.

This means that the cars on the higher track have a

✔ greater

average speed than those on the lower track.

This is demonstrated by the

✔ slope

of the higher track line being greater than the slope of the lower track line.

Explanation:

Answer:

farther than      greater      slope

Explanation:

have a nice day

The pressure p1 & p2 just at bottom of the tube are inversely proportional: p2 = p1. As seen below, a U-tube manometer connected to two air tanks at various pressures is filled with water.

Pressure & volume are inversely related for an ideal gas with a fixed mass maintained at a fixed temperature. Boyle's law, another gas law, states that there is an inverse relationship between a gas's pressure and volume. When the temperatures is held constant, pressure decreases as volume increases and vice versa.

Using a piezometer tube, often known as a "pressure measuring tube," is the easiest way to gauge a fluid's pressure in a pipe. This is a tube that holds a fluid under pressure and allows the fluid to raise to a lengths that correspond to the fluid's excess pressure over the area around it.

To know more about pressures visit:

https://brainly.com/question/15170210

#SPJ4

The largest producer of primary air pollution in the United States is what? electricity producing plants.

Answer:

electricity production

Explanation:

The nuisance doctrine is a legal principle that says someone who moves into a place knowing there is a nuisance there cannot later complain about the nuisance and demand compensation for it.

When a homeowner lives close to an airport, it is widely accepted that homeowner should have been aware of the potential noise and other disruptions connected with living close to an airport if the airport was already operational when the homeowner moved in. Such circumstances may make it more difficult for a homeowner to successfully file a claim for compensation based on noise pollution or other airport-related problems.

A stronger case might be made for compensation based on increased noise pollution and other negative effects caused by the airport if a homeowner moved into the neighbourhood before the airport was established and had no knowledge of or reasonable expectation of its construction. This is due to the fact that instead of "coming to the nuisance," they encountered a change in their surroundings after already settling down.

Read more about nuisance doctrine on:

https://brainly.com/question/28658691

#SPJ4

Answer:

c

Explanation:

beacause when in a small pack it means small

Where a river flows from an area of hard rock to an area of soft rock, the softer rock may wear away, eventually forming a drop called a waterfall. Thus, the correct option is B.

A waterfall is a river or other body of the water's steep which fall over a rocky ledge into a plunge pool below. Waterfalls are usually also called as cascades. The process of erosion, the wearing away of the earth, plays an important part in the formation of waterfalls in the world.

Waterfalls are generally created when the riverbed changes suddenly from the hard rock to soft rock. Rapids are formed where a fast-flowing river quickly cuts downwards through the waterbed of hard and soft rocks, eroding the soft rock and leaving the hard rocks which are standing above the water surface.

Where a river flows from an area of harder rock to an area of the softer rock, the softer rock may wear away, and it eventually results into the formation of a drop called a waterfall.

Therefore, the correct option is B.

Learn more about Waterfalls here:

https://brainly.com/question/30309599

#SPJ1

The amount of the mass of the radioactive isotope remaining after 1 hour is 1.25 g.

The mass of the sample remaining after an hour is calculated from the half life of the isotope as shown below.

The half life of the radioactive isotope = 10 minutes

The amount of the mass of the radioactive isotope remaining after 1 hour is calculated as follows;

1 hour = 60 minutes

0 half life ---------------------------> 10 g

20 minutes ------------------------> 5 g

40 minutes -----------------------> 2.5 g

60 minutes -----------------------> 1.25 g

Learn more about half-life here: brainly.com/question/2320811

#SPJ1

Answer:

Water is polar molecule. ... The ionic compounds are dissolved as these ions attract the hydrogen( negative charge attraacts them) and oxygen (positive charge attracts them) whereas methanol is a polar molecule and forms hydrogen bond with water molecules and hence dissolves.

Explanation:

A steel wire 4.5 m long stretches 0.15 cm when it is given a tension of 370 N. then the diameter of the wire is 2.6 × 10⁻³ m.

Given,

length of the wire L = 4.5 m

elongation l = 0.15 cm = 0.15 × 10⁻² m

restoring force F = 370 N

In this problem young's modulus of the wire is not given, consider the young's modulus of the wire is Y = 2 × 10¹¹ pa.

Youngs modulus Y = Fl ÷ AL

where A is cross sectional area of the wire,

Putting all the values

2 × 10¹¹ pa. = 370 N × 4.5 m ÷ A × 0.15 × 10⁻² m

A. = 370 N × 4.5 m ÷  2 × 10¹¹ pa × 0.15 × 10⁻² m

A = 5.55 × 10⁻⁶

πr² = 5.55 × 10⁻⁶

r = 1.32 × 10⁻³ m

Diameter d = 2r = 2 × 1.32 × 10⁻³ m = 2.6 × 10⁻³ m.

To know more about Diameter :

https://brainly.com/question/5501950

#SPJ1.

Answer:

heyyy

May I Know the full question

The energy required to raise the temperature of one gram of water by 1° Celsius is known as the specific heat capacity of water. For water, this value is 4.18 Joules per gram per degree Celsius (J/g°C). Therefore, to raise the temperature of 1 gram of water by 1° C, you would need 4.18 Joules of energy.

This is also known as the specific heat capacity of water, which is defined as the amount of heat energy required to raise the temperature of a substance by 1 degree Celsius per unit mass. The specific heat capacity of water is relatively high compared to other substances, which is why water is often used as a benchmark when measuring the specific heat capacity of other materials. It's worth noting that this value of one calorie per gram per degree Celsius applies only to pure water, and may vary slightly depending on the temperature, pressure, and other factors involved. However, for most practical purposes, one calorie per gram per degree Celsius is a good approximation to use when calculating how much energy is required to heat water.

To know more about  energy visit :-

https://brainly.com/question/1932868

#SPJ11