Answer with explanation!!!

Answer:

Originally Answered: What is the unit of measurement of pressure in the atmosphere? The SI derived unit of pressure is the pascal , abbreviated Pa. This is a pressure exerted by a force of 1 newton acting over an area of 1m².

Explanation:

Hope this helps you a lot my boo!

Answer:

Yes the valency of oxygen is 2

Answer:

LETTER A. AMPLITUDE

:)

Answer:

A

Explanation:

Answer:

the angle of reflection equals the angle of incidence—θr = θi. The angles are measured relative to the perpendicular to the surface at the point where the ray strikes the surface.

Explanation:

A microscope uses a mirror to reflect light to the specimen under the microscope. ... An astronomical reflecting telescope uses a large parabolic mirror to gather dim light from distant stars. A plane mirror is used to reflect the image to the eyepiece.

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Answer:

26

Explanation:

Answer:

(i) Effort = 250 N

(ii) Velocity ratio = 6.667

(iii) work output = 20 000 Nm

Explanation:

Given: efficiency = 60%, mechanical advantage = 4.

(i) Mechanical advantage = [tex]\frac{Load}{effort}[/tex]

Load = 1000 N

⇒ Effort = [tex]\frac{Load}{Mechanical advantage}[/tex]

             = [tex]\frac{1000}{4}[/tex]

             = 250 N

Effort = 250 N

(ii) Efficiency = [tex]\frac{Mechanical advantage}{velocity ratio}[/tex] x 100%

Velocity ratio = [tex]\frac{Mechanical advantage}{Efficiency}[/tex] x 100%

                      = [tex]\frac{4}{60}[/tex] x 100

                      = 6.667

Velocity ratio = 6.667

(iii) Work output = Load x distance moved by load

                         = 1000 x 20

                         = 20 000

Work output = 20 000 Nm

Answer:

Concave mirrors produce real and virtual images.

Explanation:

(Concave mirrors can produce both real and virtual images)

They can be upright (if virtual) or inverted (if real)

They can be behind the mirror (if virtual) or in front of the mirror (if real)

T hey can also be enlarged, reduced, or the same size as object.

Answer:

Some properties of the given mirror are summarized in the below portion.

Explanation:

Throughout that particular instance, the ground image component is immersive but instead larger than those of the attribute and it has a similar orientation as the attribute.

Throughout this particular instance, the mirror version is genuine and larger than that of the attribute. In additament, the image formation was therefore reversed.

Answer:

The moon is 400x smaller but it's also 400x closer so it looks the same size even though it's not

Explanation:

To solve this we must be knowing each and every concept related to moon. Therefore, the moon is able to fully block the sun from our view on earth as  it is 400 times.

Any celestial object that revolves around a planet, such as the eight main planets, dwarf planets, or minor planets, is referred to as a moon. In order to distinguish the moon from other celestial bodies that circle other bodies, the term "natural satellite" may also be used to describe the moon.

The Galilean moons orbiting Jupiter, called after astronomer as well as discoverer Galileo Galilei, were the first moons found outside of the moon of Earth. The moon is significantly smaller than the sun. The moon is able to fully block the sun from our view on earth as the moon appears the same size despite the fact that it's 400 times smaller because it is 400 times closer and hence smaller.

Therefore, the moon is able to fully block the sun from our view on earth as  it is 400 times.

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Answer:

The ratio of lengths of the two mathematical pendulums is 9:4.

Explanation:

It is given that,

The ratio of periods of two pendulums is 1.5

Let the lengths be L₁ and L₂.

The time period of a simple pendulum is given by :

[tex]T=2\pi \sqrt{\dfrac{l}{g}}[/tex]

or

[tex]T^2=4\pi^2\dfrac{l}{g}\\\\l=\dfrac{T^2g}{4\pi^2}[/tex]

Where

l is length of the pendulum

[tex]l\propto T^2[/tex]

or

[tex]\dfrac{l_1}{l_2}=(\dfrac{T_1}{T_2})^2[/tex] ....(1)

ATQ,

[tex]\dfrac{T_1}{T_2}=1.5[/tex]

Put in equation (1)

[tex]\dfrac{l_1}{l_2}=(1.5)^2\\\\=\dfrac{9}{4}[/tex]

So, the ratio of lengths of the two mathematical pendulums is 9:4.

Answer:

Explanation:

In friction, the coefficient of friction formula is expressed as;

[tex]\mu = \frac{F_f}{R}[/tex]

Ff is the frictional force = Wsinθ

R is the reaction = Wcosθ

Substitute inti the equation;

[tex]\mu = \frac{Wsin \theta}{W cos\theta} \\\mu = \frac{sin \theta}{cos\theta} \\\mu = tan \theta[/tex]

Given

θ = 24°

[tex]\mu = tan 24^0\\\mu = 0.445\\[/tex]

Hence the coefficient of kinetic friction between the box and the ramp is 0.445

Answer:

Im sorry i can't read it is to small

Answer:

i think its b

Explanation:

its been awhile since I've worked on Newton's first law

Answer:

Any medium or material of high refractive density e.g Water which refracts the light rays 1&2 away from their normal

Answer:

Electromagnetic waves can travel through empty space.

Explanation:

Electromagnetic waves are defined as the waves that are created due to the vibrations between a magnetic field and an electric field.

Earth atmosphere is made up of several gases and spaces between them. Thermal energy from the sun require to pass through space by electromagnetic radiation. Electromagnetic waves can travel through empty space and that is why other type of waves are unable to transfer thermal energy.

Hence, the correct answer is "Electromagnetic waves can travel through empty space".

Answer:

Explanation:

Answer:

The answer is A. Which is true

2. change the amount of electric current

Answer:

1) A = lost volts, B = lower, C = a small pressure, D, = Newtons kg, E = Modulation.

2) A = True(?), B = true, C = True, D = True, E = not sure sorry.

Explanation:

Answer:

The work done by picking up 100 20-L bottles and raising it vertically 1 meter is 19614 joules.

Explanation:

By the Work-Energy Theorem, the work needed to raise vertically 100 bottles of water is equal to the gravitational potential energy, units for work and energy are in joules:

[tex]\Delta W = \Delta U_{g}[/tex] (1)

Where:

[tex]\Delta W[/tex] - Work.

[tex]\Delta U_{g}[/tex] - Gravitational potential energy.

The work is equal to the following formula:

[tex]\Delta W = n\cdot \rho \cdot V \cdot g \cdot \Delta h[/tex] (2)

Where:

[tex]n[/tex] - Number of bottles, dimensionless.

[tex]\rho[/tex] - Density of water, measured in kilograms per cubic meter.

[tex]V[/tex] - Volume, measured in cubic meters.

[tex]g[/tex] - Gravitational acceleration, measured in meters per square second.

[tex]\Delta h[/tex] - Vertical displacement, measured in meters.

If we know that [tex]n = 100[/tex], [tex]\rho = 1000\,\frac{kg}{m^{3}}[/tex], [tex]V = 0.02\,m^{3}[/tex], [tex]g = 9.807\,\frac{m}{s^{2}}[/tex] and [tex]\Delta h = 1\,m[/tex], then the work done is:

[tex]\Delta W = (100)\cdot \left(1000\,\frac{kg}{m^{3}} \right)\cdot (0.02\,m^{3})\cdot \left(9.807\,\frac{m}{s^{2}} \right)\cdot (1\,m)[/tex]

[tex]\Delta W = 19614\,J[/tex]

The work done by picking up 100 20-L bottles and raising it vertically 1 meter is 19614 joules.

Answer:

B

Explanation:

Weight of the student on that planet is about 250 N. option (D) is correct.

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.

Let the mass of the student be m.

Mass of the Earth = M.

Radius of the Earth = R,

So, gravitational force applied on the student on Earth surface :

GMm/R² = 500 N.

Again,

mass of the planet = 2M

Radius of the planet = 2R.

So, gravitational force applied on the student on the surface of the planet  = G(2M)m/(2R)²

= 1/2 {GMm/R²

= 1/2 × 500 N

= 250 N.

Hence, His weight on that planet is about 250 N. option (D) is correct.

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Atoms have no electric charge because they have an equal number of electrons and protons.

Explanation:

So from this, we can conclude that atoms have no electric charge because they have an equal number of electrons and protons. Option C is correct.

Learn more about atoms here:

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Answer:

here you have to find the range

Explanation:

[tex]range=\frac{u^{2}sin2\theta }{g}[/tex]

[tex]\frac{4.22^{2} * sin2(63) }{10}[/tex]

1.4431m

Answer:

hope it helps......

Explanation:

Pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid.

Answer:

it is chemical energy

Explanation:

that is the energy used by our body, so it is the one that we will loose. and the energy that we gain is also chemical energy

Explanation:

since P=W/t

P=15204/40

P=380.1 Watt

Answer:

B. o J

hope it helps......

Answer:

A. 4800J

Explanation:

use the formula of work u also can get answer

Answer:

The answer is 20 miles

Explanation:

You would use a^2+b^2=c^2 to get the displacement.

So 16^2+12^2=c^2

400=c^2

c=20

Answer:

The answer to this question is given below in the explanation section.

Explanation:

Give the relation of resistance of wire with the length and thickness:

Resistance:

There is a resistance to the flow of an electric current through most conductors.

The length of wire increases

The thickness of wire decreases

The resistance of a long wire is greater then the resistance of a short wire because electrons collide with more ions as they pass through.

The relationship between resistance and wire length is proportional. The resistance of thin wire is greater then the resistance of a thick wire because a thin wire has fewer electrons to  carry the current.The relationship between resistance and the area of the cross section of wire is inversely proportional.