Will mark brainliest

Answer:

Scientists use many skills as they investigate the world around them. They make observations by gathering information with

their senses. Some observations are simple. For example, a simple observation would be figuring out the color or texture of

an object. However, if scientists want to know more about a substance, they may need to take measurements.

Measurement is perhaps one of the most fundamental concepts in science. Without the ability to measure, it would be

difficult for scientists to conduct experiments or form theories. Not only is measurement important in science and the

chemical industry, it is also essential in farming, engineering, construction, manufacturing, commerce, and numerous

other occupations and activities.

The word “measurement” comes from the Greek word “metron,” which means “limited proportion.” Measurement is a

technique in which properties of an object are determined by comparing them to a standard.

Measurements require tools and provide scientists with a quantity. A quantity describes how much of something there is or

how many there are. A good example of measurement is using a ruler to find the length of an object. The object is

whatever you are measuring, the property you are trying to determine is the object’s length, and the standard you are

comparing the object’s length to is the ruler.

In general, scientists use a system of measurement still commonly referred to as the “metric system.” The metric system

was developed in France in the 1790s and was the first standardized system of measurement. Before that time, people

used a variety of measurement systems.

In 1960, the metric system was revised, simplified, and renamed the Système International d’Unites (International

System of Units) or SI system (meters, kilograms, etc.). This system is the standard form of measurement in almost

every country around the world, except for the United States, which uses the U.S. customary units system (inches,

quarts, etc.). The SI system is, however, the standard system used by scientists worldwide, including those in the

United States.

There are several properties of matter that scientists need to measure, but the most common properties are length and mass.

Length is a measure of how long an object is, and mass is a measure of how much matter is in an object. Mass and length

are classified as base units, meaning that they are independent of all other units. In the SI system, each unit of measure has

a base unit.

Explanation:

Some things scientists want to measure may be very large or very small. The SI, or metric, system is based on the

principle that all quantities of a measured property have the same units, allowing scientists to easily convert large and

small numbers. To work with such large or small numbers, scientists use metric prefixes. Prefixes can be added to base

units and make the value of the unit larger or smaller. For example, all masses are measured in grams, but adding

prefixes, such as milli- or kilo-, alters the amount. Measuring a human’s mass in grams would not make much sense

because the measurement would be such a large number. Instead, scientists use kilograms because it is easier to write

and say that a human has a mass of 90 kilograms than a mass of 90,000 grams. Likewise, one kilometer is 1,000 meters,

while one millimeter is 0.001 meters. The table below lists some common prefixes and the quantities they represent.

Answer:

Bulb a

Explanation:

Answer:

Motion is a powerful  experience

Motion brings out the best in people

Motion can flow like oceans

Explanation:

Answer: You can easily find out the beginning point of the line by using dot representation. When it comes to position vector, it expresses the exact position of certain object from the starting point of the coordinate system. The vector is a straight line that has a certain end which is fixed to its body.

brainliest please :)

Answer:

We can easily find out the beginning point of the line by using dot representation. When it comes to the position vector, it expresses the exact position of a certain object from the starting point of the coordinate system. The vector is a straight line that has a certain end that is fixed to its body.

Answer:

The answer is 1.

Explanation:

Answer:

d

Explanation:

Machine weights are safer when used correctly, but free weights can be dropped and cause injury. These are safety considerations to keep in mind whether using free weights or machine weights. But because they aren't big, complicated machinery, free weights are less expensive.

Resistance machines and free weights are very different from one another in terms of how they work and the results they can create.

Machines are set in place and can only move in a few directions, whereas free weights can be moved in whatever direction the user selects. This is the main distinction between machines and free weights. Free weights require you to utilize more stabilizing muscles to control them, whereas resistance machines help you by stabilizing you while you move.

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7.5 hours or 450 minutes. 15/2=7.5

For the 1.0 gram sample of the same radionuclide, the required half life will be of 7.5 hours.

Given data:

The amount of sample at initial is, a = 2.0 g.

The half-life for 2.0 g sample is,  [tex]t_{1/2}=15 \;\rm hr[/tex].

In the given problem, it is a simple calculation but the concept of half life is used . The half life is defined as the a time interval required for one-half of nucleus of sample to undergo complete decay.  

In the given problem,

2.0 g of sample = 15 hours

1.0 g of sample = 15/2 hours

                         = 7.5 hours

Thus, we can conclude that for the 1.0 gram sample of the same radionuclide, the required half life will be of 7.5 hours.

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Answer:

d = 4.47 [m]

Explanation:

To solve this problem we must make a free body diagram, where we can see the direction of the force acting with the appropriate angles. In the attached image we can see the free body diagram mentioned.

So in the image, we can see an angle of 65° with respect to the horizontal, therefore we can calculate the horizontal component of the force.

Fx = 22.4*cos (65)

Fx = - 9.46 [N] (it's negative because the force is pointing in the negative direction).

We can obtain the same result using 115° as the angle.

Fx = 22.4*cos (115)

Fx = 9.46 [N]

Now we know that work is defined as the product of the force by the distance, therefore we have.

Note: Always the work must be calculated with the force parallel

to the movement

W = F*d

Where:

W = work = 42.3 [J] (units of joules)

F = force parallel to the movement = 9.46 [N]

d = distance [m]

d = W/F

d = 42.3/9.46

d = 4.47 [m]

Answer:

Explanation:

the person on top of me is right it’s 4.47

Answer:

[tex]57.24^{\circ}[/tex]

24.21 m/s

Explanation:

x = Displacement in x direction = 55 m

y = Displacement in x direction = 0

[tex]y_0[/tex] = Height of the ball when the ball is kicked = 1 m

t = Time taken = 4.2 s

[tex]a_y=g[/tex] = Acceleration due to gravity = [tex]-9.81\ \text{m/s}^2[/tex]

u = Initial velocity of ball

Displacement in x direction is given by

[tex]x=u_xt+\dfrac{1}{2}a_xt^2\\\Rightarrow 55=4.2u_x+0\\\Rightarrow u_x=\dfrac{55}{4.2}\\\Rightarrow u\cos\theta=13.1\ \text{m/s}\\\Rightarrow u=\dfrac{13.1}{\cos\theta}[/tex]

Displacement in y direction is given by

[tex]y=y_0+u_yt+\dfrac{1}{2}a_yt^2\\\Rightarrow 0=1+4.2u\sin\theta+\dfrac{1}{2}\times (-9.81)\times 4.2^2\\\Rightarrow 0=4.2u\sin\theta-85.5242\\\Rightarrow u\sin\theta=20.36\ \text{m/s}\\\Rightarrow u=\dfrac{20.36}{\sin\theta}[/tex]

[tex]\dfrac{13.1}{\cos\theta}=\dfrac{20.36}{\sin\theta}\\\Rightarrow \dfrac{20.36}{13.1}=\dfrac{\sin\theta}{\cos\theta}\\\Rightarrow \theta=\tan^{-1}\dfrac{20.36}{13.1}\\\Rightarrow \theta=57.24^{\circ}[/tex]

The ball should be kicked at an angle of [tex]57.24^{\circ}[/tex]

[tex]u=\dfrac{13.1}{\cos\theta}=\dfrac{13.1}{\cos57.24^{\circ}}\\\Rightarrow u=24.21\ \text{m/s}[/tex]

The initial speed of the ball is 24.21 m/s.

The number of unknowns in the question are two therefore two equations

are required to find a solution.

Part A: The angle at which the ball should be kicked is approximately 57.56°

Part B: The initial speed with which the ball should be kicked is approximately 24.41 m/s.

Reasons:

The given parameters are;

Time the ball should be in the air = 4.2 s

Point the ball should land, d = 5.5 m from where it was kicked

Height at which the ball leaves the ground = 1.0 m

Part A;

The angle at which the ball should be kicked.

Solution;

The horizontal distance, d = uₓ·t

Therefore;

[tex]u_x = \dfrac{d}{t} = \dfrac{5.5}{4.2} = \dfrac{55}{42}[/tex]

[tex]u_x = u \cdot cos(\theta)= \dfrac{55}{4.2}[/tex]

Where;

u = The initial velocity

[tex]Vertical \ motion , \ h =\mathbf{h_0 + u_y\cdot t - \dfrac{1}{2} \cdot g \cdot t^2}[/tex]

Which gives;

[tex]0 =1 + u_y\times 4.2 - \dfrac{1}{2} \times 9.81 \times 4.2^2 = 4.2\cdot u_y - 86.5242[/tex]

[tex]u_y =u \cdot sin(\theta) = \dfrac{86.5242}{4.2} = 20.601[/tex]

[tex]\dfrac{u_y}{u_x} =\dfrac{20.601}{\left(\dfrac{55}{4.2} \right)} = \mathbf{ \dfrac{u \cdot sin(\theta)}{u \cdot cos(\theta)}} = tan\left( \theta)[/tex]

[tex]\mathrm{The \ angle \ at \ which \ the \ ball \ should \ kicked } \ \theta = arctan \left(\dfrac{20.601}{\left(\dfrac{55}{4.2} \right)} \right) \approx \underline {57.56 ^{\circ}}[/tex]

Part B

[tex]u \cdot cos(\theta)= \dfrac{55}{4.2}[/tex]

[tex]The \ initial \ speed, \ u= \dfrac{55}{4.2 \times cos(57.56^{\circ })} \approx 24.41[/tex]

The initial speed of the ball, u ≈ 24.41 m/s

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Answer:

C3N6 is also known as propene(Meythlethylene)

Explanation:

Propene has 3 Carbon molecules and 6 nitrogen molecules. This makes the new substance a non-metal.

Answer:

newtons law of force

newtons law of force explains that something may or can or canot move depending on the objexts mass.

Answer: It moves in the direction of Fb at a constant rate of speed, because the same amount of force is being added the whole time.

Explanation:

Answer:

10:30am ........................

Answer:

maybe around 10:30 I would say

Answer:

The stored chemical energy in the battery converts to electrical energy, which travels out of the battery and into the base of the flashlight's bulb, causing it to light up. Hope this helps!!

A battery generates electrical energy through a chemical reaction known as an electrochemical reaction.

Batteries consist of one or more electrochemical cells, and each cell contains two electrodes—an anode and a cathode—immersed in an electrolyte solution.

Inside the battery, there are chemical substances that can undergo oxidation and reduction reactions. When a circuit is connected to the battery, the electrochemical reaction begins.

By maintaining a steady flow of electrons through the circuit, the battery provides electrical energy to power various devices connected to it.

The different types of batteries use different chemical reactions and materials. For instance, lithium-ion batteries utilize lithium ions in a graphite anode and transition metal oxides in the cathode.

Therefore, A battery generates electrical energy through a chemical reaction known as an electrochemical reaction.

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Answer:

Explanation:

Power is a measure of the amount of work that can be done in a given amount of time. Power equals work (J) divided by time (s). The SI unit for power is the watt (W), which equals 1 joule of work per second (J/s). Power may be measured in a unit called the horsepower.

Answer:

Global warming

Explanation:

Global warming is caused when co2 gases cause the earth to heat up and cause the environment to change

Answer:The answer would be C

Explanation:

Got it right on Edge. Please mark me brainleast

Answer:

The answer would be the last option (the one with the arrow pointing sideways)

Explanation:

The arrow lost it's acceleration and is starting to go downwards but it isn't a straight slope down

Answer:

N = 19.6 N

Explanation:

Given that,

Mass of a block, m = 2000 g

1 kg = 1000 g

It means, 2000 g = 2kg

We need to find the value of normal force on the block on a table. Normal force is balanced by the weight of the block as follows :

N = mg, g is acceleration due to gravity

N = 2 kg × 9.8 m/s²

N = 19.6 N

So, the normal force acting on the block is 19.6 N.

Given:

Initial velocity (u) = 10 m/s

Acceleration (a) = 50 m/s²

Time taken (t) = 3 s

To Find:

Final velocity (v)

Answer:

By using equation of motion, we get:

[tex] \bf \longrightarrow v = u + at \\ \\ \rm \longrightarrow v = 10 + 50 \times 3 \\ \\ \rm \longrightarrow v = 10 + 150 \\ \\ \rm \longrightarrow v = 160 \: m {s}^{ - 1} [/tex]

[tex] \therefore [/tex] Final velocity (v) = 160 m/s

Answer:

Explanation:

specific heat of marble is 880 J/kg °C

specific heat of brass is 920 J/kg °C

If Q heat is given to a body of mass m and specific heat s , and there is a rise of temperature t

Q = m s t

t = Q / m s

if Q and m is constant

t is inversely proportional to specific heat .

so rise in temperature will be inversely proportional to specific heat .

lower the specific heat , higher  will be the rise in temperature . Since marble has lower specific heat , rise in temperature in marble will be higher and quicker .

So brass will take longer time to warm up.

Answer:

All objects emit and absorb infrared radiation. The hotter an object is the more energy it radiates per second. Infrared radiation can travel through a vacuum. When infrared radiation hits an object some of the energy is absorbed, making the objects temperature increase, and some is reflected.

Explanation:

Answer:

[tex]l=L\alpha(T_c-T)[/tex]

Explanation:

L = Initial length of segment = 79 m

T = Normal temperature = [tex]20^{\circ}\text{C}[/tex]

l = Width to be left for expansion

[tex]\alpha[/tex] = Coefficient of linear expansion of the material = [tex]12\times 10^{-6}^{\circ}\text{C}^{-1}[/tex]

[tex]T_c[/tex] = Maximum temperature = [tex]39.5^{\circ}\text{C}[/tex]

[tex]\Delta T[/tex] = Change in temperature = [tex]T_c-T[/tex]

The expression of linear expansion is given by

[tex]l=L\alpha\DeltaT\\\Rightarrow l=L\alpha(T_c-T)[/tex]

The expression for the minimum gap distance l the engineers must leave for a track rated at temperature [tex]T_c[/tex] is [tex]l=L\alpha(T_c-T)[/tex]

Answer: KE= 1/2 m v^2

KE= 1/2 2500 (0)^2

KE= 0

Explanation: since initial velocity is 0, the KE is 0.

The initial kinetic energy, in [J], of car 1 is 0.

KE= 1/2 m v^2

KE= 1/2 2500 (0)^2

KE= 0

Kinetic energy is a form of energy that an object or a particle has by means of reason of its movement. If paintings, which transfer strength, are carried out on an object via making use of an internet pressure, the object hastens and thereby gains kinetic energy.

The kinetic strength of an object depends on its velocity. To trade its pace, one must exert pressure on it. It turns out there's a connection between the pressure one applies to an object and the resulting change in its kinetic electricity: KE(very last) - KE(initial) = (force) (distance)

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Answer:

The ball moves at 50 m/s

Explanation:

Kinetic Energy

Is the energy that it possesses an object of mass m due to its motion at speed v. The kinetic energy is calculated as follows:

[tex]\displaystyle K=\frac{1}{2}m\cdot v^2[/tex]

If we know the value of the kinetic energy and need to calculate the speed, we can solve it for v:

[tex]\displaystyle v=\sqrt{\frac{2K}{m}}[/tex]

Since the ball has a mass of m=0.06 kg and moves with a kinetic energy of K=75 Joule:

[tex]\displaystyle v=\sqrt{\frac{2\cdot 75}{0.06}}[/tex]

[tex]\displaystyle v=\sqrt{\frac{150}{0.06}}[/tex]

[tex]\displaystyle v=\sqrt{2500}[/tex]

v=50 m/s

The ball moves at 50 m/s

Answer:50m/s

Explanation:divide

Answer:

I'd imagine fast food is a lot more popular than most countries over there and easier to get hold of.

Explanation:

america

Answer:

There are different answers to that, like if you read a passage or something.

Explanation:

These days many people do not get exercise. A lot of jobs are now done indoors and do not require any physical activities. Technology is becoming more advanced and many people prefer using machines to do the heaving lifting.

There are a lot of fast-food restaurants and this is where a lot of people in the US choose to eat. The food is cheap and easy to pick up. This food is convenient for people on the go. The food is not healthy and it causes weight gain.

In the US, many young children find it cool to smoke. Smoking decreases the body's strength and it causes a decrease in physical health, causing people to gain weight.

Everyone has a phone these days, if not some kind of electronic device to chat with people or play games. Over time, playing on electronic devices replaces doing physical activities.