i need help with this one 2 if you guys don’t mind

Answer:

option 4

Explanation:

Light's velocity in air ( 3 × 10^8 m/s ) is much greater than sound's velocity in air ( 343 m/s )

Hence due to difference in velocities , during lightning light is seen first & sound is heard later

Answer:

C.

Explanation:

sunlight

Answer:

firstly,

ke=1÷2mv^2

on putting same ke by increasing mass by 16 times new velocity becomes v'

then

ke=1÷2×16m×v'^2

from above we can write

1÷2mv^2=1÷2×16m×v'^2

v^2=16v'^2

1÷4v=v'

hence original velocity should be decreased by 4 times to keep same ke

Answer:

i think you would have to divide to 2 numbers to get the sum

Explanation:

Answer:

Basically, at these speeds, the car will, at random times, swerve a bit to one side or the other as if hit by some huge wind (even on the calmest of days). It doesn't happen at slower speeds driving mechanically identical cars, managed to accelerate to a formidable 150 mph and stay there for most of the journey, shifting to higher gears and remaining.

Hope this helped you!

Explanation:

Answer:

The unit that is a radical among the options is;

a. NH₄⁺

Explanation:

A radical is an atom, group of atoms molecule or ion that contains an electron that is unpaired. The presence of the unpaired electrons make radical very reactive as such most radicals enter into reactions with other species or with themselves to form new compounds making them not last long.

Radicals are also known as free radicals. Examples of radicals includes; Ammonium ion, NH₄⁺

Nitrate ion NO₃⁻ (From a salt)

Hydroxide ion OH⁻ (From a base)

Sulphate ion SO₄²⁺ (From an acid)

All of which are formed in aqueous solution of acids, salts and bases.

Answer:

Average speed = 13.5 m/s

Explanation:

Since the car is running at a speed of 27 m/s  and it stops after 3 seconds by applying the brake. Therefore, the initial speed of the 27 m/s and final speed is 0.

Use below formula to find the average speed :

Average speed = (Initial speed + final speed ) / 2  

Average speed = (27 + 0 ) / 2

Average speed = 13.5 m/s

Answer:

These measurement units are part of the metric system. Unlike the U.S. customary system of measurement, the metric system is based on 10s. For example, a liter is 10 times larger than a deciliter, and a centigram is 10 times larger than a milligram.

Answer: Unlike the U.S. customary system of measurement, the metric system is based on s. For example, a liter is times larger than a deciliter, and a centigram is times larger than a milligram

Answer:

holes are made in hanging banners and hoardings to allow air to pass them as result of which there will be less pressure of air on the banners and hoardings .Unless it is done ,these may be uprooted or distorted due to the pressure of the the air

Answer:

Macroscopic

Explanation:

Visible to the human eye. Does not need any form of magnification.

Answer:

a = 0.2 m/s²

i sent u explanation before ...

Answer:

Explanation:

The three things that occur naturally everyday and how science has had an impact on what we think or do about them is

Photosynthesis is a process in which green plants manufacture there own food in the presence of sunlight through the equation below

6CO₂ + 6H₂O  ⇒ C₆H₁₂O₆ + 6O₂

From the equation above, it can be seen that aside from the food (C₆H₁₂O₆) produced by green plants during photosynthesis, science has assisted us in knowing that these green plants take-up the carbon dioxide (CO₂) that is exhaled by humans and release the oxygen (O₂) that is inhaled by humans thereby purifying the air of the surrounding they are found. This concept has made man understand the importance of planting in residential areas.

Depletion of the Ozone layer; the ozone layer is a layer in the earth stratosphere which shields the earth from direct sunlight/rays. Over the years, the burning of hydrocarbon on earth has caused the depletion of this layer thereby exposing the earth to more direct sunlight from the sun. Science has had an impact in the thinking of man in this regard by making us more conscious of the risk of burning these hydrocarbons which has led to the collective efforts by governments across the world to minimize the burning of these substances.

Rain; rain are droplets of water that fall from the atmosphere. Rain formation occurs when water (in the form of ocean, river and/or seas) are evaporated into the atmosphere as a result of heat from the sun. These evaporated water molecule rises and cools down to form and form a cloud It is then returned to earth in the form of rain. This explanation changes the mythical understanding of rain in different culture

Answer: Hypotheses, which are proposed explanations for scientific observations, help us properly design experiments because experiments are used to test those hypotheses. Experiments are designed based on the measurable variables defined in a given hypothesis.

Explanation: Make a list of all potential hypotheses to be tested. For each hypothesis, ask what would be true if the hypothesis were true. The experimental procedure is a step-by-step recipe for the science experiment. A good procedure contains enough detail that someone else could easily duplicate the experiment.

Hope this helps^^

Answer:

Water striders have strong intermolecular forces on their legs which enables them to run on water.

Answer

The driver should reduce the speed or velocity of vehicle

because momentum which is

Mass x velocity will be reduced if velocity reduces and reduce force if impact

Answer:

Instantaneous velocity

Explanation:

Acceleration = rate of change of velocity

Average velocity = total displacement divided by total time taken

Position = It shows the location of the object

Instantaneous velocity = It is the velocity of an object at a particular instant.

The term that describes how fast and in what direction an object is moving at a particular moment is "instantaneous velocity". It is basically equal to the derivative of position wrt time.

Answer:

[tex]F=8.88\times 10^{11}\ N[/tex]

Explanation:

Given that,

Mass of a planet is [tex]8.03\times 10^{26}\ kg[/tex] and it is located at a distance of [tex]6\times 10^{14}\ m[/tex] from the Earth.

The mass of Earth is [tex]5.972\times 10^{24}\ kg[/tex]

We need to find the force of gravitation between Earth and the planet. It is given by :

[tex]F=G\dfrac{m_1m_2}{d^2}\\\\F=6.67\times 10^{-11}\times \dfrac{8.03\times 10^{26}\times 5.972\times 10^{24}}{(6\times 10^{14})^2}\\\\F=8.88\times 10^{11}\ N[/tex]

So, the force between them is [tex]8.88\times 10^{11}\ N[/tex].

Answer:

V = 0.9 m/s

Explanation:

The parameters given are:

Initial velocity U = 6.4 m/s

Time t = 0.64s

Height h = 2.05 m

To find the final velocity, let us use third equation of motion

V^2 = U^2 - 2gH

Since the ball is going upward, g will be negative

Substitute all the parameters into the formula

V^2 = 6.4^2 - 2 × 9.8 × 2.05

V^2 = 40.96 - 40.18

V^2 = 0.78

V = sqrt( 0.78)

V = 0.883 m/ s

V = 0.9 m/ s approximately

Answer:

Gravity is not just found in earth. It is an attractions which can occur in any objects in the universe.The difference is just on less and more gravity.

Answer:

Explanation:gravity

.

Answer:

Gravity

Explanation:

Gravuty aspect of the gas giants has the biggest effect on their rings and satellites.

The answer is weight increases

Answer:

Weight increases

Explanation:

The gravitational force increases as the size of an object increases. On the other hand, the strength of gravity is inversely related to the square of the distance between two objects

Answer:

3 digits .

Explanation:

The least count of the ruler that is being used is 0.1 cm , hence it can measure upto one decimal point of cm . One more decimal point can be inferred .

So the measurement of 5 cm will look like

5 .00 cm or it will have 3 significant figure . The last figure of the measurement suffers from error as it has been inferred or guessed.

It's not. What it is, often, is easier.

You should know by now that you need to be working with a consistent set of units. This means that your unit for velocity is your unit for length divided by your unit for time…and your unit for acceleration is your unit for velocity divided by your unit for time…and your unit for force is your unit for acceleration multiplied by your unit for mass…and your unit for energy is your unit for force multiplied by your unit for length…and your unit for power is your unit for energy divided by your unit for time…and so on.

In this way, your calculations will automatically yield answers in the correct units.

SI makes things very easy because of everything being consistent and base 10 with the metric prefixes. It also was standardized nicely from the start. It also is based upon a number of important physical constants…so, for example, water at room temperature is about 1g/cc and it has a a specific heat of 1 calorie per gram and 100 degrees between freezing and boiling.

These days, all other systems of measurement are based on SI units, anyway, so you'll be hard pressed to find a better and easier system to work with.

[tex]a = \frac{v - v 0}{t} [/tex]

[tex]a = \frac{10 - 0}{20} [/tex]

[tex]a = \frac{10}{20} = \frac{1}{5} = 0.2[/tex]

Answer:

this happens because there is gravitational force acting upon it.

Answer:

The book will fall when you drop it and make a thud, It falls on the floor because there is no force holding it up, but there is a force pulling it down, the gravitational force. It doesnt rise higher in the air because It does have lighter like the properties of a balloon.

Explanation:

Answer:

31.25 is the correct answer

Answer:

b) Joule's law is that the heat evolved per second, or the electric power loss, P, equals the current I squared times the resistance R, or P = I2R. The power P has units of watts, or joules per second, when the current is expressed in amperes and the resistance in ohms.

Explanation:

c) P= v2÷R

PR=V×V= 100×42=4200

v=sqroot 4200= 64.8volts

Answer:

The correct option is;

B. Designing experiments to replicate the conditions in which life may have first evolved on Earth

Explanation:

The proof to the hypothesis that life originated from inanimate inorganic, or non-living  molecules which is an explanation for the origin of life on Earth was provided by an experiment designed and performed in 1953 by Stanley L. Miller and Harold C. Urey which consisted of using chemicals proposed in the hypothesis and combining them through a specific design process to replicate expected atmospheric condition before the life began on Earth.

With such successful design of experiments to replicate the conditions in which life may have first evolved on Earth, it was possible to better explain the hypothesis that life originated from inorganic molecule.

Answer:

The male gamete is smaller in comparison to that of the female gamete.

The male gamete is conical from the front while the female gamete is spherical.

The cytoplasm in the male gamete is less in comparison to that of the female gamete.

The male gamete can move with the help of the tail while the female gametes are immobile and do not have any tail or flagella present.

The number of mitochondria present in the sperm is less than the number of mitochondria present in the ovum.

The male gamete has acrosome present in the head region that contains enzymes for dissolving the membranes present around the ovum. The ovum does not contain such digestive enzymes.

Explanation:

Answer:

MALE GAMETES:

1)A male gamete is the male reproductive cell, which unites with the female gamete to produce the zygote.

2)Produced by spermatogenesis.

3)Produced in testes.

4)Smaller than female gametes.

5)Swims using tails.

6)Uses sugar in seminal fluid.

FEMALE GAMETES:

1)A female gamete is the female reproductive cell, which unites with male gamete to form the zygote.

2)Produced by oogenesis.

3)Produced in the ovaries.

4)Larger than male gametes.

5)Does not move by itself.

6)Uses protein and fat in the cytoplasm.

in short

Gametes are an organism's reproductive cells. They are also referred to as sex cells.

Female gametes are called ova or egg cells,  and male gametes are called sperm. In contrast, each egg cell, or ovum, is relatively large and non-motile.

hope this helps you friend

Answer:

18

Explanation:

atomic number = number of protons