Mosses are located in which zone of deciduous forests? a. tree stratum b. ground c. shrub d. herb please select the best answer from the choices provided a b c d

The net force on an object if a  force of 30 N to the right is applied to an object. An opposite force of 20 N to the left is applied to the same object is 10 N to the right. And the right option is D.

The net force is the vector sum of all the forces that act upon an object.

To calculate the net force applied to the object, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence the right option is D. 10 N to the right.

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Given:

The length of the pipe is L.

The third harmonic has teh wavelength,

To find:

The type of the pipe

Explanation:

The wavelength of the harmonics for a pipe closed at one end is,

The wavelength of the harmonics for a pipe open at both the ends is,

Here,

The given wavelength is,

which resembles the form,

Hence, the pipe is open at the other end.

Answer:

neutrons.........................

Unless a light ray comes into contact with a surface or enters a different material, it travels in a​ straight line.

When light enters a medium with a different speed or transitions from a fast to a slow medium, refraction occurs. According to Snell's law, if a light ray is incident ordinarily on the surfaces, then deviating from the normal will always lengthen the travel time.

Theoretically, sine (angle of incidence)*index of refraction of the incident media = sine (angle of refraction)*index of refraction of the refractive medium

Sine (0)=0 because the angle of incidence is 0 degrees.

As a result, the light ray will travel straight.

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The net acceleration of the block is about -2.04m/s².

The mass of the block is 20Kg. The force applied is 50 N and the angle at which the force is applied is 25°. The coefficient of friction is 0.20.

When the block will be pulled along horizontal by applying Force fat an angle A, then there will be two components of force one along vertical fsinA and one along horizontal fcosA.

The friction will be in opposite direction,

So, we can say, the net Force F on the block is,

F = Fr - fcosA

Ma = uN -fcosA

Where,

a is the acceleration of the block,

M is the mass of the block,

N is the normal force,

f is the applied force and,

u is the coefficient of friction.

Putting all the values,

20(a) = 0.2(50)sin(25°) - 50cos(25°)

20a = 0.2(0.42)(50)-50(0.9)

20a = 4.2 - 45

20a = 40.8

a = -2.04m/s².

The net acceleration of the block is -2.04m/s².

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The wavelength of the reflected light will have a range from 360 nanometers to 700 nanometers.

Constructive Interference may be defined as the process which occurs when the maxima of any two waves add up and the amplitude of the resulting wave will be equal to the sum of the two individual waves. According to the question thickness of coating, d = 295 nm and wavelength varies as n = [(30nm) ^1/2]/λ^1/2.

Also, the wavelength will be expressed as

λ = 2nd/M where M = 1,2,3......

λ = 2d[(30nm)^1/2]/Mλ^1/2

λ^3/2 = (d60nm^1/2)/M

λ = ∛d² 3600 nm/M

Now, if M = 1 then,

λ = ∛295² 3600nm/1 = 679.18 nm

Now, if M = 2 then,

λ = ∛295² 3600nm/2 = 679.18 nm

Now, if M = 3 then,

λ = ∛295² 3600nm/3 = 326.51 nm

So, the range is approximately 360 nm to 700 nm.

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Complete Question:

Scientists are testing a transparent material whose index of refraction for visible light varies with wavelength as n = 30.0 nm1/2 /l1/2, where l is in nm. If a 295-nm-thick coating is placed on glass 1n = 1.502 for what visible wavelengths will the reflected light have maximum constructive interference?

Given,

On simplifying,

Thus,

Or

Thus, x=9 and x=-15

Therefore the correct answer is the third option

It falls 9.8m far for the apple to drop from tree in 1.4sec.

Apple fall time t = 1.4 s

The free fall distance in time t is given by

d = 1/2at²

where a = g = 10 m/s² = free fall acceleration

calculation:

Using the above formula and the values ​​given, the distance the apple will fall free in 1.4 seconds is

d = 1/2(10)(1.4)²

= 9.8 m

Therefore the distance um the apple will fall is 9.8 m.

Isaac Newton formulated gravitational theory in 1665 or 1666 after watching an apple fall. An apple falling from a tree is an example of Straight-line motion because gravity causes it to fall vertically in a straight line.

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The magnitude of the acceleration of the box is  = 0.625 m/s²

Friction is the pressure resisting the relative movement of strong surfaces, fluid layers, and material elements sliding in opposition to each other. There are numerous kinds of friction: Dry friction is a pressure that opposes the relative lateral motion of strong surfaces in touch.

Pressure is a power that could exchange the movement of an object. A pressure can reason an item with mass to alternate its speed, i.e., to boost up. pressure also can be defined intuitively as a push or a pull. A force has each magnitude and course, making it a vector amount.

Acceleration is the price of trade of the rate of an item with appreciation to time. Accelerations are vector portions. The orientation of an item's acceleration is given by way of the orientation of the net force performing on that object.

Force = mass × acceleration

acceleration = force / mass

                       = 25 / 40

                       = 0.625 m/s²

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The non-conservative work done on the boy is 1.337 kJ

Given that,

Mass of boy, m = 68.1 kg

Initial speed of boy, u = 1,60 m/s

The boy then drops through a height of 1.56 m

Final speed of boy, v = 8.51 m/s

Now, we have to find the non-conservative work was  done on the boy.

The Work done by the non-conservative forces is equal to the sum of total change in kinetic energy and total change in potential energy.

[tex]W=\frac{1}{2}m (v^{2}-u^{2})+(0-mgh)[/tex]

[tex]W=\frac{1}{2}m (v^{2}-u^{2})-mgh[/tex]

[tex]W=\frac{1}{2}(68.1) ((8.51)^{2}-(1.60)^{2})-68.1*9.8*1.56[/tex]

W = 1337.62 Joules

or

W = 1.337 kJ

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Magnetic fields can be used to excite electrons in atoms because a magnetic field can pull or push electrons.

Magnetic fields pull and push electrons which leads to the excitation of electrons. Metals have electrons that are loosely held together. Moving a magnet around a coil of wire around a magnet pushes the electrons in the wire that creates an electrical current. The magnetic force will not change the speed of an electron because the magnetic force is always perpendicular to the speed. Current in these coils causes the deflection of the electrons that is perpendicular to the magnetic field which is to the direction of the electrons.

So we can conclude that magnetic fields can pull or push electrons so that a magnetic field can be used to excite electrons.

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The displacement of the team is 2.74 miles due east and 7.52 miles due north from where they started.

The eastward displacement of Ida Haitarun and his team during the cross country race is calculated by forming a right triangle from the displacement of the team.

The angle of inclination of the displacement is calculated as follows;

θ = 90⁰ - 20⁰ = 70⁰ (above the horizontal)

The eastward displacement is the base of the triangle and it is calculated as follows;

cos θ = base / hypotenuse side

cos 70 = base / 8 miles

base = (8 miles) x (cos 70)

base = 2.74 miles

The northward displacement is calculated as follows;

sin θ = height / hypotenuse side

sin 70 = height / 8 miles

height = (8 miles) x (sin 70)

height = 7.52 miles

Thus, the team is 2.74 miles due east and 7.52 miles due north from where they started.

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The load a speaker provides on an amplifier is referred to as speaker impedance. That is, in fact, the result of speaker impedance.

Speaker impedance is defined as the "resistance" a speaker provides to the current delivered by an amplifier in technical terms.

The resistance is known as impedance because an amp's output current is AC (as opposed to DC, like from a battery), not DC. To be completely technical, impedance is the result of adding any reactance present in an AC circuit to DC resistance.

Just keep in mind that speaker impedance impacts how much current is drawn from the amplifier without getting too technical.

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1092.72 square meters / min, area of the oil slick increasing.

Area = pi*r^2

da/dt = pi*2r*(dr/dt)

da/dt = pi*(2)*(58)*3 = 1092.72 square meters / min.

In a two-dimensional plane, a circle's area is the space it takes up. The area of a circle is another term for the area that lies within a circle's perimeter. A = r2, where r is the circle's radius, is the equation for a circle's surface area. The square unit, such as m2, cm2, in2, etc., is used to measure area. The formula for the area of a circle is (Pi) = 22/7 or 3.14, where (Pi) = r2 or d2/4 in square units. The ratio of a circle's diameter to circumference is known as pi.

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The Monkey captured Bryce's spirit inside a circle of salt inside a McDonald's bathroom stall and left after escaping from Lady Bullseye. After several weeks, he finally came back and set him free.

When injected, tranquilizer-filled darts fired by tranquilizer guns temporarily sedate a person or an animal so that they can be handled (or captured) safely. The tranquilizer may be a paralytic, sedative, or anesthetic. There is a long history of using tranquilizer weapons to capture wildlife without harm. The most frequent sensations are relaxation and sleepiness. Negative feelings, stress, or anxiety might also gradually fade away once the sedative starts to work. Your entire body could experience tingling, especially in your arms, legs, hands, and feet.

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Stephen Hawking, speaking at the opening of the 2012 London Paralympics games, said, “There is no such thing as a standard run-of-the mill human being and however difficult life may seem but there is always something you can do, and succeed at.”

Stephen Hawking was born on 8th January, 1942, Oxford, England. He died on March 14, 2018, Cambridge. He was that theoretical physicist whose theory of exploding black holes drew upon both relativity theory and quantum mechanics. He had also worked with space-time singularities.

Hawking was also awarded the US Presidential Medal of Freedom in year 2009.

At the age of 21, Hawking was diagnosed with amyotrophic lateral sclerosis that gradually paralyzed him. Stephen Hawking had an estimated IQ of 160. According to Healthline, 68% of people have an IQ that ranges between 85 and 115.

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Answer: (A)

Explanation: the answer will be A because a force is acting on the block from the right side to the left side and another from the bottom upwards. So the two forces together will make the block move diagonally to the left. There is no force in the opposing direction of these two force.  B is wrong as there is no force acting on the left side. C is wrong as there is no force acting downward. D is wrong as there is no force acting to the right and from above

magnitude of the momentum of the combined mass immediately after the collision  p = 0. 478 (kg. m/sec)

Mass of bullet : m = 5. 25 (g) = 0. 00525 (kg)

Mass of block : M = 360 (g) = 0. 360 (kg)

Height : h = 8. 75 (m) = 0. 0875 (m)

Here we need to find the momentum :

Now,

As we know that,

The conservation of energy :

Now,

Kinetic energy = Potential energy

= 1/2( m + M)v² = (m+M)gh (m,M is mass of bullet and block)

Now,

v = [tex]\sqrt{2gh}[/tex]

Now,

Momentum can be defined as :

Here,

p = (m+ M) [tex]\sqrt{2gh}[/tex]. . . eqn 1

Putting the values in eqn 1 :

We get,

p = 0.478 (kg. m/sec)

Hence, the momentum : p = 0. 478 (kg. m/sec)

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The speed of the plane = 202m/s

What is speed ?

Speed is what it means. the speed at which an object's location changes in any direction. The distance travelled in relation to the time it took to travel that distance is how speed is defined. Speed is a scalar quantity since it just has a direction and no magnitude.

To make equations like Eq. immediately applicable, we accept the textbook's use of positive direction options. Directly beneath the release point, at ground level, is the coordinate origin.. The coordinate origin is at ground level directly below the release point. We write θo = −37.0degree

 for the angle measured from +x, since the angle φo = 53.0 degree

 measured in the problem is in the -y direction. The graphic below depicts the problem's basic configuration.

(A) The plane's speed at the point of release determines the projectile's initial speed. Given

that y0 = 730m and y=0 at t=5.00s,

to find v  : y−yo  =(v sinθo)t− 1/2gt^2 ⇒0.730m=v

sin(−37.0 degree )(5.00s)− 1/2(9.80m/s^2 )(5.00s) ^2

which yields v  =202m/s.

the speed of the plane = 202m/s

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The horizontal distance between the end of the rifle and the eye of the bull is equal to 50.35 m.

The equations of motion can be described as the equations which set up the relationship between the velocity of the object, the acceleration, time, and distance of the moving object.

Consider that a vector r, which describes the position of the bullet when it reaches the target, is composed of [tex]r_x[/tex] and [tex]r_y[/tex]

[tex]r = (r_x, r_y)[/tex]

Given that [tex]r_y[/tex] is -0.029 m (the reference is located at the end of the rifle),

r =([tex]r_x[/tex], -0.029 m)

The vertical position of the bullet at time 't'  can be written in form of an equation as follows:

[tex]y = (y_o +v_oy) t + \frac{1}{2} g t^2[/tex]

The vertical component of the speed at t = 0 is 0, then, acceleration, v₀y = 0 and y₀ = 0.

Then, we can find the time for the vertical position (y) of bullet -0.029 m:

-0.029 m =(0)t - (1/2) · (9.8 m/s²) · t²

t = 0.077 sec

The equation for the horizontal position  can be written as:

x = x₀ + (v₀x) · t

Since the origin of the reference system is located at the bullet starts its trajectory, x₀ = 0.

x = (v₀x) · t

x = (655) × 0.077 = 50.35m

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Answer:

20 N

Explanation:

logically it'd be 20 N due to the fact that it's a rectangular shape. You pretty much look at the counterpart and copy and paste it to the other side.

The main reason for the sea level rise is the melting of the ice, as the icebergs are melting due to the increase in the average temperature of the earth, therefore the correct answer is option A.

It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.

Thermal expansion is unrelated to the sea level rising.

Since icebergs are melting due to an increase in the earth's average temperature, melting ice is the primary cause of sea level rise, therefore the correct answer is option A.

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The pressure exerted by both on the trampoline is 25,480 N/m².

The pressure exerted by both on the trampoline is the force per unit area which is calculated as follows;

P = F/A

where;

Substitute the given parameters and solve for the pressure exerted.

P = (mg)/A

A = 0.25 m x 0.1 m

A = 0.025 m²

P = (65 x 9.8) / (0.025)

P = 25,480 N/m²

Thus, the pressure exerted at any given surface depends on the applied force and the area of the given surface.

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The third trial of the lab experiment did not work out because in most probability the magnets lost their magnetic properties or got demagnetized.

Demagnetization is the phenomenon by which magnets lose their magnetic property or are weakened. We see that the magnets moved just a little after she left them after the first two trials of her experiment. It is possible that because the magnets moved a little they repelled each other and this only happens when like poles face each other.

The demagnetizing field of one magnet will affect the other and vice versa because their magnetic fields are opposite in direction. Consequently, magnetic field strength weakens gradually. Thus the magnets did not work after the 3rd trial.

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The magnitude of the force with which the apple has resisted the arrow is 88.06 Newton.

Using, work-energy theorem,

According to which, the work done by the all the forces on the body is equal to the change in kinetic energy of the body.

So, we can write,

Work done = ∆KE

We know,

Work done = force × displacement

The force is the resistive force by the apple and the displayed is given to be 0.075 meters.

So, we can write,

F(0.075) = 1/2M(V²-U²)

Where,

M is the mass of apple,

V is final velocity,

U is initial velocity.

Putting all the values,

F(0.075) = 1/2(0.0213)((25.3)²-(35.5)²)

Solving further,

F = 88.06 Newton

The resistive force of the apple is 88.06 Newton.

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Three units deformations observed in these bands.

Elastic force is the force that permits some materials to regain their former shape after being stretched or crushed. Thus, a stretched rubber band is subject to an elastic force.

The rubber band experiment uses a straightforward rubber band to show entropic force and a refrigeration cycle. The rubber band experiment involves stretching and then releasing a rubber band while measuring its temperature.

Always acting in the opposite direction of motion is friction. This indicates that if friction is there, it cancels out some of the force driving the motion (if the object is being accelerated). This results in a decreased acceleration and a smaller net force.

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The stationary satellite crosses the equator at a speed of 1180 kilometres per hour.

At the equator, where the Earth's circumference is 40,070 kilometres and the day lasts for 24 hours, the speed is 1670 kilometres per hour (1037 miles per hour). This slows down by the latitude's cosine, so at a latitude of 45 degrees, cos(45) =. 707, and the speed is. 707 x 1670 = 1180 kilometres per hour.

The daily motion felt on our earth is brought on by this spinning. You would move at almost 1,000 miles per hour (1,600 km/hr) if you were standing on the equator of the Earth, but your pace would slow down if you started moving in the direction of the North or South Poles.

A latitude of 45 degrees, cos(45) =. 707, and the speed is. 707 x 1670 = 1180 kilometres per hour.

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The wind velocity at 32 m above the ground is 6.39m/s when the roughness exponent of the surface is 0.23

Given in the problem is

Wind velocity at 13m above the ground v1 =5.2 m/s

Height initially h1 = 13m

height at which wind velocity is to be predicted h2= 32m

surface roughness exponent α = 0.23

Let velocity to be predicted be v2

We know that from the formula

v2= v1*(h2/h1)^α

⇒v2= 5.2 * (32/13)^ 0.23 = 6.39 m/s

Thus the wind velocity at 32m above the ground is 6.39m/s

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The bird's average speed when he flies 10 m/s for 3 s, 15 m/s for 3s and 20 m/s for 4 s is 15.5 m/s. The right option is C 15.5 m/s

Average speed can be defined as the ratio of the total distance to the total time traveled by an object.

To calculate the average speed of the bird, we use the formula below.

Formula:

From the question,

Givne:

Substitute these values into equation 1

Hence, the average velocity of the bird is 15.5 m/s.

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