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.
What is the relationship between force and distance?
Answer:
Force is the action exerted on a body of mass to move from one palce to another or to change position
While distance is a measure of how far and object has travelled from its starting point, or how far away it is OR Distance is a measure of seperation between two points
Explanation:
The relationship between them both is MOTION .......thats what I think
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GIVING BRAINLY, FOLLOW AND STARS, HELP!
When a solid object absorbs infrared rays, what happens to the particles
in that object?
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:
PLZZZ HELLPP MEE
Which of the choices below shows a model of the atom Neon (Ne)?
B.
D.
Ne
Ne Ne
OB
ОС
OD
Answer:
A is answer
Explanation:
this is helpful
A haiku about motion.....I need a haiku about motion...if someone like writing pls help, write a haiku about MOTION
Answer:
Motion is a powerful experience
Motion brings out the best in people
Motion can flow like oceans
Explanation:
A ball of mass 200 g rolls along the ground at a speed of 5.2 m/s. Calculate the kinetic energy of the ball. Give your answer to one decimal place.
The formula for kinetic energy is 1/2 mv2. The kinetic energy is 0.40 m/s2.
What is Kinetic energy?
Kinetic energy, which can be seen in the movement of an object or subatomic particle, is the energy of motion. Kinetic energy is present in every particle and moving object.
Examples of kinetic energy in action include a person walking, a baseball soaring through the air, a piece of food falling from a table, and a charged particle in an electric field. An object has no kinetic energy if it is not moving.
Potential energy is present in stationary objects (the other main type of energy). When an object is propelled into motion by a force like gravity, its potential energy is transformed into kinetic energy.
Therefore, The formula for kinetic energy is 1/2 mv2. The kinetic energy is 0.40 m/s2.
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If a car with an initial velocity of 10 m/s accelerates at a rate of 50 m/s^2
for 3 s. What will be the final velocity? *
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
Why are many adults and youth in the United states overweight?
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.
A driver speeds along a curved road and sees a fallen tree on the road. He applies the brakes but is unable to stop in time. When the car hits the tree, it slows down from 6 meters/second to 0 meters/second. What was the change in velocity during this time?
Answer:
It's -6 meters/seconds.
Explanation:
Answer:
-6
Explanation:
what allows for movement
Choose the correct answer:
-excretory
-immune/hymophatic
-integumentary
-muscular
Explain how to identify a starting position on a line.
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.
What is the speed of a car that travels 400 m in 20
minutes?
Answer:
3.33 m/s
Explanation:
time = 20 minutes = 20 x 60 = 120 seconds
distance = 400m
speed = distance/time
= 400/120
= 40/12
= 10/3
= 3.33m/s
compound name: for C3N6
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.
30 POINTS!
A coconut falls 18 m from the top of a palm tree. How fast will the coconut be traveling when it reaches the ground? (Hint: KEinitial = 0, PEfinal = 0.)
A. 19 m/s
B. 13 m/s
C. 9.4 m/s
D. 27 m/s
Answer:
d
Explanation:
who said an atom is like a ball with no charge?
Answer:
Thomson
Explanation:
Thomson in 1904 soon after the discovery of the electron, but before the discovery of the atomic nucleus, the model tried to explain two properties of atoms then known: that electrons are negatively-charged particles and that atoms have no net electric charge.
A football punter wants to kick the ball so that it is in the air for 4.2 s and lands 55 m from where it was kicked. Assume that the ball leaves 1.0 m above the ground.
Part A: At what angle should the ball be kicked?
Part B: With what initial speed should the ball be kicked?
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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Explain how an iron needle can become magnetized...
Use these words in your answer:
Domain
Align
Force
Answer:
If a piece of iron is brought near a permanent magnet, the electrons within the atoms in the iron orient their spins to match the magnetic field force produced by the permanent magnet, and the iron becomes “magnetized.”
Explanation:
i dont know how to add align and domain
How is power calculates
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.
Is better to run or walk when it is raining?
Answer:
run
Explanation:
run - less wet
walking - more wet
PLEEASEEE HEELLPPPP !!!!!!!
Which refers to the rate of change in velocity?
speed
O acceleration
O direction
O magnitude
You leave Chicago, Illinois at 8am and fly to Portland, Oregon. Your flight takes 2.5 hours. What time do you arrive in Portland?
Answer:
10:30am ........................
Answer:
maybe around 10:30 I would say
Can anyone please help me put
Answer:
Bulb a
Explanation:
An 4-kg ball experiences a force and accelerates at a rate of 1.5 m/s.
What is the strength of this force?
Answer:
6.0 N
Explanation:
The strength of a force is expressed as the magnitude of the force in Newton.
The formula to apply here is :
Force= mass * acceleration
F=ma
Mass, m = 4 kg
Acceleration = 1.5 m/s²
Force= 4 *1.5 = 6.0 N
Car 1 of mass m1 is waiting at a traffic light.
Car 1 is struck from behind by Car 2 of mass m2.
The two cars stick together after the collision.
Car 2 was traveling at v2i = 30.0 m/s before the collision.
What is the initial kinetic energy, in [J], of car 1, if m1= 2500kg?
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
What is kinetic energy?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.
What's the initial and very last kinetic strength?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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Click to review the online content. Then answer the question(s) below, using complete sentences. Scroll down to view additional questions. Free Weights and Machines What are some things to consider when deciding to use free weights or machine weights?
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.
What are free weights or machine weights?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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A tablecloth can be pulled out from underneath a fully set table without breaking plates or glassware. The reason is that the objects follow Newton's:
Answer:
newtons law of force
newtons law of force explains that something may or can or canot move depending on the objexts mass.
PLEAASSEEEE HELLLPPP !
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:
tell me something stupidbthe stupidest one gets brainliest
1. A particular lever is 90.0% efficient. If 50.0 J of work are done on the lever, then how much work does the lever do on its load? 2.The mechanical advantage of a pulley system is 4.00. Using this pulley system, how much force do you need to exert to lift a 500.0 N box?
Answer:
Explanation:
Using the efficiency formula;
Efficiency = Work done by the machine (output)/work done on the machine (input) ×100%
Efficiency =w/50 ×100
90 = 100w/50
Cross multiply
90×50 = 100W
4500 = 100W
W = 4500/100
W = 45Joules
Hence the lever does 45Joules of work on its load
2) Mechanical Advantage= Load/Effort
Given
MA = 4
Load = 500N
4 = 500/Effort
Effort = 500/4
Effort =125N
Hence the effort required to lift the load is 125N
1. The work done by the lever on its load is 45 J
2. The force needed to exert to lift the load is 125 N.
1. Determination of the work done by the lever on the load.
Work Input = 50 J
Efficiency = 90%
Work Output =?[tex]efficiency \: = \frac{work \: output}{work \: input} \times 100 \\ \\ 90\% = \frac{work \: output}{50} \\ \\ cross \: multiply \\ \\ work \: output \: = 90\% \: \times 50 \\ \\ work \: output = 0.9 \: \times 50[/tex]
Work Output = 45 JTherefore, the work done by the lever on the load is 45 J
2. Determination of the force needed to lift the load
Mechanical advantage (MA) = 4
Load (L) = 500 N
Effort (E) = ?[tex]mechanical \: advantage \: = \frac{load}{effot} \\ \\ 4 \: = \frac{500}{effort} \\ \\ cross \: multiply \\ \\ 4 \: \times effort \: = 500 \\ \\ divide \: both \: side \: by \: 4 \\ \\ effort \: = \frac{500}{4} \\ [/tex]
Effort = 125 NTherefore, the force needed to lift the load is 125 N
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A block of mass 4 kg rests on a frictionless horizontal surface, what horizontal force is required to accelerate the block at 5 m/s^2 ?
Answer:
20N
Explanation:
Given parameters:
Mass of the block = 4kg
Acceleration = 5m/s²
Unknown:
Horizontal force needed to accelerate the block = ?
Solution:
According to Newton's second law of motion;
Force = mass x acceleration
Now insert the parameters and solve;
Horizontal force = 4 x 5 = 20N