What is the Sun's approximate composition (by mass)?
A. 50% hydrogen, 25% helium, 25% other elements
B. 70% hydrogen, 28% helium, 2% other elements
C. 90% dark matter, 10% ordinary matter
D. 100% hydrogen and helium

Answer:

For metric-system conversions, follow this method: Sound travels at about 340 m/s, so multiply the number of seconds you counted by 340, and you'll know how many meters away lightning struck. A three-second count, then, would place the lightning strike about 1,020 m away, or roughly 1 km.

Explanation:

hope it hep and if it doesnt sorry

The distance struck by the lighting flashes is 680 m.

The given parameters;

The distance struck by the lighting is calculated by applying the principle of echo as follows;

\(v = \frac{2d}{t} \\\\2d = vt\\\\d = \frac{vt}{2} \\\\d = \frac{340 \times 4}{2} \\\\d = 680 \ m\)

Thus, the distance struck by the lighting flashes is 680 m.

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Answer:

vertical columns

Explanation:

you should search up answers before putting them here. It will save time

The current should the solenoid carry is 0.22A.

We need to know about the magnetic field of solenoids to solve this problem. The magnetic field appears when there is any current flowing through the solenoid. The magnitude of the magnetic field can be determined by

B = μ₀ . I . N / L

where B is the magnetic field, μ₀ is the vacuum permeability (4π x 10¯⁷ H/m), I is current, N is coil turns and L is the length of the solenoid.

From the question above, the parameters given are

L = 52.0 cm = 0.52 m

d = 1.35 cm

R = 0.0135/2 m

B = 0.375 mT = 0.000375 T

N = 705

By substituting the given parameters, we can calculate current

B = μ₀ . I . N / L

0.000375 = 4π x 10¯⁷ . I . 705 / 0.52

I = 0.22 A

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Answer:

they reflect light waves

Explanation:

The tiny drops or ice particles in clouds scatter between 20 and 90 percent of the sunlight that strikes them

Answer:

They reflect light waves

Explanation:

Titanium is a non-magnetic metal because of its digital configuration and crystal shape.

In its pure shape, titanium has a hexagonal near-packed (hcp) crystal structure, this means that that its atoms are organized in a specific pattern in the crystal lattice.

This association outcomes inside the absence of unpaired electrons that could create magnetic moments, making it non-magnetic. Moreover, the electron configuration of titanium does not permit for magnetic moments to shape.

Titanium has four valence electrons, which are positioned within the 3-d and 4s orbitals.

The electrons in the 3d orbital are paired, which means that they've opposite spins and cancel out any magnetic second that could be created by means of the electrons inside the 4s orbital.

But, whilst titanium is alloyed with other metals, inclusive of iron or nickel, it may turn out to be magnetic because of the magnetic houses of these metals.

This belongings is utilized in various programs, inclusive of in the manufacturing of plane and medical implants, where the non-magnetic houses of titanium are important to keep away from interference with electromagnetic gadgets.

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Answer:

Explanation:

When a space ship is accelerating in space, there is a force known as Inertia that kicks in. Inertia will mirror the effects of gravity on the ship even if there is no gravitational field effect such that anything that would happen where there is gravity, would continue to happen.

This means that apples will fall from trees, people's feet will touch the ground, sky divers will be pulled downwards and balls will bend downwards when thrown as well. These are the same effects expected on earth where gravity pulls things towards the earth's core.

Answer:

B,C,D,E

apples falling from trees

people’s feet touching the ground

sky divers moving toward the ground  

balls bending downward after being thrown

correct on EDGE2021

Answer:

it is 15

Explanation:

join

Answer:

A. Doubling the mass

Explanation:

Doubling the mass increases the kinetic energy of a car the most.

Doubling the mass increases the kinetic energy of the car.

           1 Joule = 1 Kg m²/ s².

Hence, Option A is the correct answer.

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Sound moves through air at a 343 m/s rate. A sound with such a 500-Hz frequency Hz and a length of 6.4 m is observed in an experiment.

A large study is an observational one, just like a bridge one. So once more, researchers respect our subjects' privacy. In contrast, researchers have observed the same subjects repeatedly during in the course of a longitudinal study, which can run for years at a time.

A longitudinal study is an observation one, just like a pass one. So once more, scientists respect their subjects' confidentiality. In contrast, researchers observe the same subjects repeatedly over the course of a large study, which can run for years at a time.

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The acceleration of plane is upward with a magnitude of 40 m/s².

What is an acceleration?

Acceleration is the rate of change of velocity over time. It is a vector quantity, which means that it has both magnitude and direction. When an object's velocity changes, either by increasing or decreasing in magnitude, or by changing direction, it is said to be accelerating. The unit of acceleration is meters per second squared (m/s²).

To find the acceleration and direction of the plane, we need to calculate the net force acting on it:

Net force = Applied force - Air resistance + Gravitational force + Lift force

Net force = 10,000 N - 10,000 N + 20,000 N + 20,000 N

Net force = 40,000 N

Since the net force is positive, the direction of the acceleration is in the direction of the net force, which is upward.

To find the magnitude of the acceleration, we can use Newton's second law of motion:

Net force = Mass x Acceleration

Rearranging this equation, we get:

Acceleration = Net force / Mass

Assuming a mass of 1000 kg for the plane, we have:

Acceleration = 40,000 N / 1000 kg

Acceleration = 40 m/s²

Therefore, the plane is accelerating upward with a magnitude of 40 m/s².

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If a catcher stops a 92 mph (41. 1 m/s) pitch in his glove and slows it to rest in 0. 15 m with a force of 803 N, the ball's mass is 0.14 kg.

According to Newton's Second Law of Motion, when a force acts on a mass, acceleration (or gaining speed) occurs (object). A good illustration of this law of motion in action is when you are riding a bicycle. The mass is represented by your bicycle. The force is generated by your leg muscles as they push against the bicycle pedals.

a = (Vf²- Vi²)/2.d

The distance is 0.15 meters, the initial velocity is 92 miles per hour, or 41 m/s, and the final velocity is 0 (rest).

a= -5603 m/s²

use the second Newton law,

F= m.a

m= F/a

m= 803N/5603 m/s²

m= 0.14kg.

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Answer:

2m/s

Explanation:

speed = distance÷time

speed =90÷45=2m/s

Answer:

A. Aplastic skeleton that shows all the bones of the body

Explanation:

because physical means like 3D and not on paper or in technology.

Answer:

The methane gives Neptune the same blue color as Uranus.

Explanation:

Answer:

Uranus and Neptune are the two most distant planets in our solar system

Both are different from the larger gas giants Jupiter and Saturn, and from smaller rocky worlds like Earth

Uranus and Neptune have similar masses and internal compositions

Explanation:

Answer:

The answers to your questions are given below

Explanation:

22. The energy of an electromagnetic wave and it's frequency are related by the following equation:

E = hf

Where:

E => is the energy

h => is the Planck's constant

f => is the frequency

From the equation i.e E = hf, we can conclude that the energy of a wave is directly proportional to it's frequency. This implies that an increase in the frequency of the wave will lead to an increase in the energy of the wave and also, a decrease in the frequency will lead to a decrease in the energy of the wave.

23. Gamma ray and radio wave are both electromagnetic waves. All electromagnetic waves has a constant speed of 3×10⁸ m/s in space.

Thus, gamma ray and radio wave have the same speed in space.

Answer:

c. aluminum foil

Explanation:

Reflection is defined as the returning of light or sound wave from a surface at certain angles. For example: our image in the mirror.

To reflect light, we required a surface with one side completely polished, smooth and pure form so that it reflects maximum light rather than absorbing the light. Aluminum foil will reflect the most light from the given options. Aluminum foil has the purity and surface smoothness that makes it able to reflect maximum light. Any change in the smoothness of the aluminum foil, the reflectivity of light will decrease.

Other option a clear window, a green plastic bottle and a red lunch box will absorb more light rather than refect it.

Hence, the correct option is "c. aluminum foil ".

Answer:

Explanation:

Vector quantities are those quantities which needs both magnitude and direction for their description.

Here, in all the options except option B, there is no direction. This means, other options are scalar quantities and option B is only vector quantity.

Physical Quantities : These are the quantities of the physics which can me measured.

There are two types of physical quantities,

Vector quantities are those quantities which needs both magnitude and direction for their description. Example : Velocity, acceleration etc.

Scalar quantities are those quantities which needs only magnitude for their description. Example : Speed , distance etc.

The frequency of blue light in hertz is d.) 7.5 x 1014.

What is frequency of a light and how is it calculated?

The electromagnetic radiation differs from other radiations through frequency of that wave. Light is one of the forms of electromagnetic radiations. A hertz is said to be the number of oscillations in one second. For a wave, hertz is the number of wavelengths per second. All types of light travels at a same speed irrespective of their frequency.

The equation that relates frequency and wavelength is:

c= fλ

where, c= speed of light

λ = wavelength in meters

f= frequency in hertz

c= 3×10 8 m/s

λ = 4.0 x 10 -7 meters.

f=c/λ

  ⇒3×10 8 /  4.0 x 10 -7

   ⇒7.5 x 1014 Hz.

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answer

64 is C (c) 1-Bromo-3-methylbutane

63 is D

i is secondary ii is primary

CSP technologies can be used to generate electricity by converting sunlight energy to power a turbine, but the same basic technologies can also be used to deliver heat to a variety of industrial applications such as water desalination, enhanced oil recovery, food processing, chemical production, and mineral processing.

Concentrating  solar-thermal powertechnologies use mirrors to reflect and concentrate sunlight onto a receiver. The energy from the concentrated sunlight heats a high temperature fluid in the receiver.

This heat, also known as thermal energy, can be used to spin a turbine or power an engine, thereby producing electricity. It can also be used in industrial applications such as water desalination, improved oil recovery, food processing, chemical production, and mineral processing.

Utility-scale projects typically employ concentrated solar-thermal power systems. Utility-scale CSP plants can be configured in a variety of ways. Mirrors are arranged around a central tower that serves as the receiver in power tower systems. Linear systems use rows of mirrors to focus sunlight onto parallel tube receivers located above them.

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The magnification of the microscope is 5x, meaning that the object will appear 5 times larger when viewed through the microscope.

To calculate the magnification of the microscope, we can use the formula:

Magnification = -(focal length of the objective lens) / (focal length of the eyepiece)

Focal length of the objective lens (f_objective) = 75 mm

Focal length of the eyepiece (f_eyepiece) = 150 mm

Substituting the values into the formula, we get:

Magnification = -(75 mm) / (150 mm)

Simplifying the expression, we find that the focal lengths cancel out, leaving us with:

Magnification = -1/2

The negative sign indicates that the image formed by the microscope is inverted. The magnitude of the magnification is 1/2 or 0.5.

However, in microscopy, the magnification is often expressed as a positive value. Therefore, we take the absolute value of the magnification, resulting in a magnification of 0.5.

To convert the magnification to the commonly used "x" notation, we multiply it by 10:

Magnification = 0.5 x 10 = 5x

Hence, the magnification of the microscope is 5x.

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The acceleration of the rock thrown with the velocity of 15 m/s and taking 20 seconds to come back is 2.97 \(m/s^2\),  and the direction of acceleration is downward.

When an item is moving, its velocity indicates how quickly its location is changing as seen from a specific point of view and as measured by a specific unit of time. When time is constant, speed and distance are directly proportional, when the distance is constant,

Given:

The velocity of the rock, v = 15 m/s,

The time taken to go and return t = 20 seconds,

Now, calculate the distance traveled by the rock,

d = v/t

d = 15/10  (Time taken to go upward is half of the total time)

d = 1.5 meters

So, calculate the acceleration by the second equation of motion,

\(s = vt + 1/2at^2\)

Substitute the values,

\(1.5 = 15*10 + 1/2 * a * 10^2\)

\(a = -2.97 \ m/s^2\)

Therefore, the acceleration of the rock thrown with the velocity of 15 m/s and taking 20 seconds to come back is 2.97 \(m/s^2\) And the direction of acceleration is downward.

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We've put together a step-by-step explanation of how people hear—from the moment sound waves arrive to the outer ear, then travel through the middle and inner ear and transform into meaningful signals sent on to the brain. Our brain uses these signals to organize and communicate with the external world.

Explanation:

a) Power = work / time = force × distance / time

P = Fd/t

P = (85 kg × 9.8 m/s²) (4.6 m) / (12 s)

P ≈ 319 W

b) P = Fd/t

0.70 (319 W) = (m × 9.8 m/s²) (4.6 m) / (9.6 s)

m = 47.6 kg

The man's power rating while doing the work will be 319 W and the mass of the girl will be 47.6 kg.

Power can be defined as the amount of work completed in a given amount of time. Watt (W), which is derived from joules per second (J/s), is the SI unit of power. Horsepower (hp), which is roughly equivalent to 745.7 watts, is a unit of measurement sometimes used to describe the power of motor vehicles and other devices.

Average power is calculated by dividing the total energy used by the total time required. The average quantity of work completed or energy converted per unit of time is known as average power.

According to the question,

a) Power = work / time

P = (force × distance) / time

P = Fd/t

P = (85 kg × 9.8 m/s²) × 4.6 m / 12 s

P = 319 W

Hence, the power rating while doing the work is 319 W.

b) P = Fd/t

0.70 × 319 W = (m × 9.8 m/s²) × 4.6 m / 9.6 s

m = 47.6 kg

Hence, the mass of the girl is 47.6 kg.

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The Cartesian coordinates of the point are approximately (4.5, 2.8).

To find the Cartesian coordinates of a point given its polar coordinates, we use the following formulas:
x = r cosθ
y = r sinθ
Where r is the distance from the origin to the point and θ is the angle that the line connecting the point and the origin makes with the positive x-axis.

In this case, the polar coordinates of the point are (5.3, 32°). This means that the distance from the origin to the point is 5.3 and the angle that the line connecting the point and the origin makes with the positive x-axis is 32°.

Using the formulas above, we can find the Cartesian coordinates of the point:

x = 5.3 cos(32°) ≈ 4.5
y = 5.3 sin(32°) ≈ 2.8

Therefore, the Cartesian coordinates of the point are approximately (4.5, 2.8).

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Answer:

150

Explanation:

work done = constant force x distance moved in the direction of force

W = F x S

(UNITS: J = N x m)

50 x 3 = 150

Answer:

Explanation:

A simple pendulum consists of a mass (usually represented as a small object or bob) attached to a string or rod of negligible mass. The mass is free to swing back and forth under the influence of gravity.

In the figure, the point of suspension is denoted by "O," and the mass (bob) is represented by the small circle. The string or rod is represented by the vertical line connecting the point of suspension to the bob.

Amplitude:

The amplitude of a pendulum refers to the maximum displacement or swing of the bob from its equilibrium position. In the figure, the amplitude can be represented by the angle formed between the vertical position and the position of the bob when it swings to its maximum distance on one side. It is usually denoted by the symbol "A."

Effective Length:

The effective length of a pendulum refers to the distance from the point of suspension to the center of mass of the bob. It represents the distance over which the mass swings back and forth. In the figure, the effective length can be measured as the length of the string or rod from the point of suspension to the center of the bob. It is usually denoted by the symbol "L."

It is important to note that the amplitude and effective length of a simple pendulum affect its period of oscillation (the time taken for one complete swing). The relationship between these parameters and the period can be described by mathematical formulas.

Overall, the simple pendulum is a fundamental concept in physics and provides a simplified model for understanding oscillatory motion and the principles of periodic motion.

The moon setting on your way to work about two hours after sunrise means it is in the gibbous phase.

This phase of the moon involves its side facing the Earth appearing more than half-lit by the Sun, but is less than fully lit.

This phase occurs few hours after sunrise usually in the early morning which is why it is the most appropriate choice.

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Answer:

a. increase

Explanation:

Doubling the mass of the Earth would double your weight, since gravitational force is directly proportional to mass, but doubling the radius (which doubles if the diameter doubles) would decrease your weight by a factor of 1/4, since gravitational force is inversely proportional to the square of the radius.

Answer:

300 Pascal

Explanation:

Given

weight or force (F) = 6000 N

area (A) = 20 m²

pressure (p) = ?

we know

the force acting normally per unit area is pressure. So

P = F / A

= 6000 / 20

= 300 Pascal

Hope it will help :)