A plane convex lens is made of glass (n = 1.5) with one flat surface and the other having a radius of 20 cm. what is the focal length (in cm) of the lens?

The given statement "scientists are concerned about the decrease in ozone is allowing more ultraviolet" is true because ozone is a molecule made up of three oxygen atoms that exist in the Earth's atmosphere. It's a form of oxygen that absorbs almost all of the Sun's harmful ultraviolet light.

Ultraviolet rays are very harmful to humans, causing skin cancer, immune system breakdowns, and cataracts in the eyes. When the ozone layer is damaged or thinned, it can allow more ultraviolet rays to penetrate the atmosphere, which is why scientists are so concerned about ozone depletion.What are the impacts of ozone depletion?It is estimated that a 1% reduction in the ozone layer increases the incidence of non-melanoma skin cancer by 2%.A decrease of 10% in the ozone layer may result in a 20% increase in the incidence of skin cancer.The thinning of the ozone layer may result in a decrease in plant production, which may result in food supply shortages.A decrease in ozone may have an impact on phytoplankton, which play a crucial role in ocean food webs. These tiny creatures consume carbon dioxide and produce half of the world's oxygen. As phytoplankton numbers decline, ocean ecosystems may change, affecting everything from fish populations to weather patterns.

Learn more about ozone at

https://brainly.com/question/27911475

#SPJ11

True, it is possible for a fault to have a north-south (N-S) strike and an eastward dip.

Faults can have various orientations and dips depending on the tectonic forces and geological conditions in a particular region. The strike refers to the direction of the fault line on the Earth's surface, while the dip indicates the angle at which the fault plane is inclined from the horizontal. Therefore, a fault can have any combination of strike and dip, including an N-S strike and an eastward dip.

Faults are geological fractures where movement has occurred, and their orientations can vary. A fault with a north-south (N-S) strike means it extends in that direction horizontally. The dip refers to the angle of the fault plane from the horizontal. So, it is possible for a fault to have an N-S strike and an eastward dip.

To know more about tectonic forces.

https://brainly.com/question/13897553

#SPJ11

Please find attached photograph for your answer. Please do comment whether it is helpful or not.

Answer:  An effect of continental drift is causing tectonic plates resting upon the convecting mantle to move which results in natural disasters like earthquakes, volcanic eruptions, and more.

Answer:

\( \green{ \sf \: \: 1.6 \: m {s}^{ - 2} \: \: \: is \: the \: correct \: answer}\)

Explanation:

\( \sf \: \huge{g } _{ \small{moon}} = \frac{ {\huge{g}}_{earth}}{6} \\ \\ \sf \implies \: \sf \: \huge{g } _{ \small{moon}} = \frac{ 9.8}{6} = 1.6 \: \: m {s}^{ - 2} \)

In the given circuit, there are two operational amplifiers (amplifiers a and b) used for different purposes:

a) Amplifier a (difference amplifier): The purpose of amplifier a is to amplify the difference in voltage between the voltage across Rsensor (temperature sensor) and the voltage across Rref (reference sensor). It compares the two input voltages and produces an output voltage proportional to their difference.

b) Amplifier b (inverting amplifier): The purpose of amplifier b is to amplify the voltage produced by amplifier a and provide the final output voltage, Vout. It amplifies the voltage from amplifier a with a gain determined by the resistors R1 and R2.

To derive a relation for Vout, we can use the concept of a difference amplifier:

Vout = - (R2 / R1) * (Vin - Vref)

Given Vin = -80 mV, Rsensor-Ref = 30 kΩ at 37°C, K = -5000 Ω/°C for the sensor, R1 = 600 Ω, R2 = 400 Ω, and Vref = 0 V, we need to calculate Vout when the sensor is at 37.002°C.

Using the given values, we can substitute them into the equation and calculate Vout accordingly.

Learn more about amplifiers here

https://brainly.com/question/31978810

#SPJ11

A particle with a mass of m/2 and a charge of 2q has kinetic energy of 2K when it is propelled from rest by the same potential difference.

Due to the fact that mass has no impact on kinetic energy, W = K = QV. where charge = Q ,q, V = possible discrepancy, mass and k, m = kinetic energy. The kinetic energy of a particle with a 2q charge and a v potential difference is given by the equation K = QV, where K1 = Q1V1. K¹ = 2Q¹ x V¹ = 2(QV) (QV). Due to K = QV, K1 = 2K is obtained by substituting K = QV into 2(QV). Applying the equation E=(k)(q/r2), If q becomes 2q and r becomes 2r, When an electric charge is present in a specific region of space, its properties are altered and an electric field is generated. The term "electric field" refers to the physical field that surrounds electrically charged particles and acts to either attract or repel other charged particles in the field.

Learn more about Kinetic energy here:

https://brainly.com/question/30027997

#SPJ4

The vertical component of the force vector 42 N is 7.29 N and the  that of the vector B is 26 N. Then the resultant vector is 18.71 N. The equilibrant is the same but opposite in direction ie., - 18.71.

Vectors are physical quantities having both magnitude and direction. The quantities with magnitude only are called scalar quantities. Force, work done, displacement , momentum etc are vector quantities.

The resultant of two vectors depends on their magnitude and direction. The given two vectors A and B are in opposite directions. Hence, the resultant vector will be their difference in magnitude.

Vertical component of vector A = 42 cos 80 = 7.29 N

component of vector B = 34 cos 40 = 26 N.

Then, resultant vector = 26 N - 7.29 N = 18.71 N

equilibrant = - 18.7 N.

Find more on vectors:

https://brainly.com/question/24256726

#SPJ1

Answer:

the laws of motion is what keeps everything going an back without gravity they couldn't been no us . let them say what they was but newton knows best if they want to come an say newtons discovery changed the world without him we couldn't rest

Answer:

I think that's because the force of gravity is greater than the buoyant force, and for the hot air balloons, they can increase/decrease the temperature of the air in the balloon in order for it to rise/fall for more control. For planes, they use aerodynamics as well as the help of a couple of engines to thrust the plane forward. I hope this helps.

If the net force on an object is zero, then the forces applied to it are balanced.When the net force on an object is zero, the object is said to be in a state of equilibrium. In other words, the object is either at rest or moving at a constant velocity (i.e., it is not accelerating).This is because the forces acting on the object are balanced. That is, there are equal and opposite forces acting on the object, canceling each other out. As a result, there is no net force acting on the object.

A net force is the sum of all forces acting on an object. If the net force on an object is zero, it means that the sum of all forces acting on the object is zero. When the net force is zero, the object will either be at rest or moving at a constant velocity.

To determine the net force acting on an object, you need to add up all of the forces acting on the object. If the forces are acting in the same direction, you add them up. If they are acting in opposite directions, you subtract them. The resulting force is the net force acting on the object.

learn more about  net force

https://brainly.com/question/14361879

#SPJ11

The moment caused by the 2 kg mass placed at a distance of 0.5 m to the left of the pivot is 1 kg m. This moment is anticlockwise.

Moment is a physical parameter equal to the product of the distance or displacement and another physical quantity such as mass, force etc.

For a mass of 2 kg and distance of 0.5 m the moment is  :

moment = mass × distance

= 2 × 0.5 = 1 kg m

If we are taking the moment of force, then it the product of the distance and force acting on the body is taken.

force = mg

F =  2 kg × 9.8 m/s² = 19.6 N

then moment of force = 19.6 N × 0.5 m = 9.8 N

The moment from left to right in direction is anticlockwise.

Find more on moment:

https://brainly.com/question/16755013

#SPJ1

Answer:We can use the kinematic equations of motion to solve this problem. The equation we need to use is:

v^2 = u^2 + 2as

where v is the final velocity, u is the initial velocity, a is the acceleration due to gravity (which is -9.81 m/s^2), and s is the displacement.

Initially, the ball is thrown straight down with an initial speed of 4.30 m/s and a height of 8.80 m. Let's take the upward direction as positive. Using the equation of motion for displacement, we can find the time it takes for the ball to reach a height of 5.80 m:

s = ut + (1/2)at^2

-3 = 4.3t + (1/2)(-9.81)t^2

-4.905t^2 + 4.3t - 3 = 0

Using the quadratic formula, we find that the time it takes for the ball to reach a height of 5.80 m is t = 0.956 s (rounded to three significant figures).

Now, we can use the equation of motion for velocity to find the velocity of the ball at this point:

v^2 = u^2 + 2as

v^2 = (4.3 m/s)^2 + 2(-9.81 m/s^2)(-3 m)

v = -5.08 m/s

The negative sign indicates that the velocity is in the downward direction. Therefore, the velocity of the ball when it reaches a height of 5.80 m is 5.08 m/s downward.

Explanation:

The winch needs a minimum power of 320 Watts to pull the object up the incline at 4.00 m/s. To determine the minimum power required by the winch, we need to consider the work done against friction and the time it takes to move the object.

The power (P) can be calculated using the formula:

P = work / time

The work done against friction can be calculated using the formula:

work = force * distance

The force of friction (F) can be determined by multiplying the coefficient of kinetic friction (μ) with the normal force (N). The normal force can be calculated by multiplying the mass of the object (m) with the acceleration due to gravity (g).

force of friction (F) = μ * N

force of friction (F) = μ * m * g

The distance traveled by the object can be determined using the formula:

distance = speed * time

Now, let's calculate the power:

First, we need to calculate the force of friction (F):

F = μ * m * g

Given that the coefficient of kinetic friction (μ) is 0.200, the mass of the object (m) is not provided, and the acceleration due to gravity (g) is approximately 9.8 m/s².

Next, we need to calculate the distance traveled by the object. It is not provided in the question, so we cannot proceed with the calculation of power without this information.

Without knowing the distance traveled by the object, we cannot calculate the minimum power required by the winch to pull the object up the incline at 4.00 m/s.

To know more about Watts , visit;

https://brainly.com/question/29034284

#SPJ11

Answer:

its very important in science because without atoms the universe would have not been created and our sun and our own planets

The nuclear reactions generally occurs in the deep part of the earth called the core. It is the fusion reaction which produce huge amount of energy to the universe. So the nuclear reactions important to the universe.

The process in which two lighter nuclei fuse together to form a heavier nucleus with the simultaneous release of a huge amount of energy is defined as the nuclear fusion. Some mass is always lost which is converted into energy in accordance with Einstein's equation.

It is the fusion reactions which are common in the interior of stars. The energy of our sun is believed to arise from a number of complex fusion steps. The sun is the ultimate source of energy in the universe which is due to the fusion reaction.

The nuclear reactions are responsible for the nucleosynthesis which means the formation of the elements in the universe.

To know more about nuclear reactions, visit;

https://brainly.com/question/3246846

#SPJ3

The plane's speed is 450 miles per hour, and the wind speed is 50 miles per hour. This is determined by solving the equations derived from the distances and times of the flight with and against the wind.

Let's assume the speed of the plane (without considering the wind) is P, and the speed of the wind is W.

When flying into a headwind, the effective speed of the plane is reduced by the wind speed. So the equation for the outbound flight is:

P - W = 2000 miles / 5 hours

P - W = 400 miles per hour (mph)  ---(Equation 1)

When flying with a tailwind, the effective speed of the plane is increased by the wind speed. So the equation for the return flight is:

P + W = 2000 miles / 4 hours

P + W = 500 miles per hour (mph)  ---(Equation 2)

Now we have a system of two equations (Equation 1 and Equation 2) with two variables (P and W). We can solve this system to find the values of P and W.

Adding Equation 1 and Equation 2 together, we eliminate the variable W:

(P - W) + (P + W) = 400 mph + 500 mph

2P = 900 mph

P = 450 mph

Substituting the value of P back into Equation 1 or Equation 2, we can solve for W:

450 mph - W = 400 mph

W = 450 mph - 400 mph

W = 50 mph

Therefore, the plane's speed is 450 mph and the wind speed is 50 mph.

To know more about headwind visit-

https://brainly.com/question/33318976

#SPJ11

Answer:

Weight of the box? 980 N

Value of the normal force? 630 N

Acceleration of the box? 7.5 m/s^2

Explanation:

I got the answer right

The most likely mean for aurora. She drinks one or two drinks every night. Option C is correct.

Binge-drinking is explained as having five or more drinks in one sitting for males, and four or more drinks in one sitting for women.

The majority of people who binge-drink do not have a serious alcohol problem. Binge-drinking, on the other hand, is a dangerous risk behavior linked to significant injuries and a variety of disorders.

Hence, option C is correct.

To learn more about the binge-drinking, refer to the link;

https://brainly.com/question/8049036

#SPJ1

Answer:

Six is the only number that is both the sum and the product of three consecutive positive numbers.

Explanation:

Answer:

TRUE - A test booklet is sitting at rest on a desk. Compared to the force of the booklet on the desk, the force of the desk on the booklet is the same.

TRUE - The acceleration of an object is always in the direction of the net force acting on it.

Answer:According to Coulomb's law, the electrostatic force between two bodies is proportional to the product of their two charges. If the charge on A is increased this product increases in size (it must have been non-zero to begin with, since there was a force between them at first). Thus, the force between them rises.

Explanation:

Answer:

8000 J

Explanation:

There is a Quizlet made by a teacher with this answer.

We connect multiple batteries in series in order to get the biggest possible voltage.

Series connection

A circuit is set to be connected in series when there is same flow current through all the component in the circuit.

There is only one path for current to flow.

Parallel connection

A circuit is said to be connected in parallel when all the components are connected across each other's lead.

If we connect two batteries in series then the two batteries add up their voltage. And we have the combined voltage. (as shown in image)

series means connecting one anode to the another cathode of next.

similarly if batteries placed in parallel then the voltage in circuit is same as of individual battery.

We connect multiple batteries in series in order to get the biggest possible voltage.

To know more about voltage

https://brainly.com/question/12999755

#SPJ4

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 50 × 5

We have the final answer as

Hope this helps you

Answer:

Isolated or Closed system, both are correct

Answer: 0.25 m/s

Explanation:  Speed = wavelengt · frequency  

v = λf   and frequency is 1/period  f = 1/T

Then v = λ/T = 5 m / 20 s = 0.25 m/s

It takes approximately 7.7 seconds for the ball to reach you from your friend who is 60 meters away from you. This is calculated by using the formula v=u+at, where v is the final velocity, u is the initial velocity and t is the time taken for the ball to reach you.

Here, the final velocity is 0 m/s, the initial velocity is 17 m/s and the acceleration due to the grass is -1.0 m/s2. By substituting these values in the formula, we get t=v-u/a. After solving the equation, we get t=17-(-1)/1=7.7 seconds. This is the time taken for the ball to reach you from your friend who is 60 meters away.

Know more about acceleration here

https://brainly.com/question/12550364#

#SPJ11

The values of all sub-parts have been obtained.

(1).  The maximum factored load the beam can withstand is 45.2 kN/m.

(2).  The moment resistance of the cross-section is 291735.65 Nm.

(3).  The factored moment demand is 27939.6 Nm

1) To draw the governing shear and bending moment diagram for the factored load, we need to first calculate the maximum factored load that the beam can withstand.

The maximum factored load on the beam is given by:

Dead Load = 20 kN/m + 15 kN

                   = 35 kN/m.

Live Load = 2 kN/m + 1 kN

                = 3 kN/m.

Total Factored Load = 1.2 x Dead Load + 1.6 x Live Load

                                  = 1.2 x 35 kN/m + 1.6 x 3 kN/m

                                  = 45.2 kN/m.

The maximum factored load the beam can withstand is 45.2 kN/m.

The shear force and bending moment diagrams for the given factored load can be obtained as shown below:

Shear Force Diagram:

Bending Moment Diagram:

2) To calculate the moment resistance of the cross-section, we can use the formula:

MR = σst A'(d - a/2) + 0.85f'c A''(d - a/2)

Where, σst = yield stress of tension steel [σst = fy / γst],

γst = safety factor for tension steel [γst = 1.15A']

A' = area of tension steel, [A'' = b(d - a)].

Where,

b = width of the beam [b = 600 mm],  

d = total height of the beam [d= 1000 mm],

a = effective depth of tension steel [a = 920 mm]

f'c = compressive strength of concrete [f'c = 25 MPa],

MR = σst A'(d - a/2) + 0.85f'c A''(d - a/2)

MR = (400 / 1.15) x 10 x (1000 - 920/2) + 0.85 x 25 x 590 x (1000 - 920/2)

MR = 291735.65 Nm

The moment resistance of the cross-section is 291735.65 Nm.

3) To check if this cross-section is adequately designed to resist the factored bending moment (LRFD), we need to calculate the factored moment demand and compare it with the moment resistance.

The factored moment demand is given by:

MF = ϕ x Mu

Where,ϕ = resistance factor = 0.9, Mu = factored bending moment

Mu = 1.2 x Dead Load x L2 / 8 + 1.6 x Live Load x L2 / 8 + 1.2 x (Dead Load + Live Load) x L2 / 2

   = 1.2 x 35 x 152 / 8 + 1.6 x 3 x 152 / 8 + 1.2 x 38 x 152 / 2

   = 31044 Nm

MF = ϕ x Mu

     = 0.9 x 31044

    = 27939.6 Nm

The factored moment demand is 27939.6 Nm, which is less than the moment resistance of the cross-section, i.e., 291735.65 Nm.

Therefore, this cross-section is adequately designed to resist the factored bending moment.

To learn more about factored bending moment demand from the given link.

https://brainly.com/question/31385809

#SPJ11