Answer:
A
Explanation: Just did the test:)
Does anyone have a science fair Idea in the topic force and motion? Please I need help!
Answer:
i did this project where i took two marbles pool noodles and tape then i made a ramp and i saw which marble would go down faster the big marble or the little marble hope this helps!!
what was the average speed of the car for the entire 8 hour trip?
Answer: we need sum more info
Explanation:
150+ miles or about 150+ if there on a highway 80+ if its a regualr road
Some of the types of energy in the electromagnetic spectrum will be familiar, such as X-rays, microwaves, and radio waves. The most important part of the spectrum in photosynthesis is visible light. What are the colors of the visible spectrum
Answer:
Red, orange, yellow, green, cyan, blue, violet.
Explanation:
As we know that the energy of every photon of light directly depends on the size of the wavelength. As short as the wavelength would be as greater the energy delivered by each photon of light would be. Thus, the colors displayed in the visible electromagnetic spectrum would include 'red, orange, yellow, green, cyan, blue, violet' with different wavelengths.
An engineer has the task of producing an aluminum alloy with a density of 3.0 grams per cubic centimeter. She comes up with the perfect alloy and saves a sample of it. Which mass and volume measurements correspond to this sample?
7 g and 2.3 cm³
10 g and 7 cm³
15 g and 5 cm³
21 g and 8 cm³
Answer:
The best option is for the following option m = 15 [g] and V = 5 [cm³]
Explanation:
We have that the density of a body is defined as the ratio of mass to volume.
[tex]Ro =m/V[/tex]
where:
Ro = density = 3 [g/cm³]
Now we must determine the densities with each of the given values.
For m = 7 [g] and V = 2.3 [cm³]
[tex]Ro=7/2.3\\Ro=3.04 [g/cm^{3} ][/tex]
For m = 10 [g] and V = 7 [cm³]
[tex]Ro=10/7\\Ro=1.42[g/cm^{3} ]\\[/tex]
For m = 15 [g] and V = 5 [cm³]
[tex]Ro=15/5\\Ro=3[g/cm^{3} ]\\[/tex]
For m = 21 [g] and V = 8 [cm³]
[tex]Ro=21/8\\Ro=2.625[g/cm^{3} ]\\[/tex]
Energy Transformations
Choose the sequence of energy forms that best fits each item.
__________ 1. Flashlight a. chemical energy→ electrical energy→ light energy
__________ 2. Electric saw b. electrical energy → thermal energy
__________ 3. Toaster c. electrical energy → mechanical energy
__________ 4. Gas Scooter d. mechanical energy → electrical energy
__________ 5. The Sun e. mechanical energy → sound energy
__________ 6. Wind Turbine f. chemical energy → electrical energy →sound energy
__________ 7. iPod g. chemical energy → thermal energy →mechanical energy
__________ 8. Speaker vibrates h. nuclear energy → light energy and heat energy
(9) __________________________________ energy from gas, oil, or coal provides
(10) _____________________________ energy to produce steam. A turbine changes the energy of the steam into the
(11) _____________________________________ energy of the rotating turbine and generator. The generator converts this energy into
(12) ___________________ energy. The lamp is an energy converter, changing (13)_________________________ energy to
(14) ________________________ energy.
Answer:
1. chemical energy --> electrical energy --> light energy
2. Electrical Energy --> Mechanical Energy
3. Electrical Energy --> Heat Energy
4. Chemical Energy --> Thermal Energy --> Mechanical Energy
5. Nuclear Energy --> Light energy and thermal energy
6. Mechanical Energy --> Electric Energy
7. Chemical Energy --> Electrical Energy --> Sound Energy
8. Mechanical Energy --> Sound Energy
Explanation:
If a car is traveling forward at 15 M/S, how fast will be going in 1.2 seconds if the acceleration is 10 M/s2?
Answer:
Vf=27m/s
Explanation:
Vf=Vi+at
Lets substitute the known variables into the equation:
Vf=15+10×1.2
Vf=27m/s
So itll be going 27metres per second
An example of ________ would be the horizontal distance a soccer ball moves between being kicked and touching the ground again.
Answer:
Range.
Explanation:
Range in projectile motion can be defined as the horizontal distance traveled by an object.
An example of range would be the horizontal distance a soccer ball moves between being kicked and touching the ground again.
What accommodations can be made for people with impaired vision?
A wave with a frequency of 14Hz has a wavelength of 3 meters. At what speed will this wave travel
Answer:
frequency = 14 Hz
wavelength = 3 m
speed = ?
speed = frequency
x wavelength
speed = 14 x 3speed = 42 meter per second
Explanation:
(a)Explain
(i)why the rate of loss of thermal the walls of the flask by conduction is very low.
_______________________________________________________________
(ii)why the rate of loss of thermal energy through the walls of the flask by radiation is very low.
_________________________________________________________
(b)Suggest with reasons,what must be added to the flask shown in the pic in order to keep the liquid hot.
____________________________________________________
Answer:
the vacuum between the glass walls. ... Since air is a poor conductor of heat, having trapped air in the sponge and hollow plastic stopper help to prevent heat loss by conduction
3.A carnival ride has a radius of 5.00 m and exerts an applied force of 987 N on an 80 kg rider.
a. Find the centripetal acceleration of the rider.
Given:
r =
F =
m =
Unknown:
a =?
Equation:
a = F / m
Answer:
gggn×2
lol
Explanation:
hujhyhhhgyhngfg
ojui
ukk
lol
A 0.061 kg golf ball is struck by a golf club with a force of 299.4 N. The change in velocity of the ball is 54.3 m/s. How much time is the ball in contact with the club?
Answer:
The time the ball is in contact with the club is approximately 0.011063 seconds
Explanation:
The question is with regards to Newton's second law of motion which states that a force is equal to the rate of change of momentum produced
The given parameters are;
The mass of the ball, m = 0.061 kg
The force with which the ball is struck with the golf club, F = 299.4 N
The change in velocity of the ball, Δv = 54.3 m/s
By Newton's second law, we have;
[tex]F_{net} = \dfrac{\Delta P}{\Delta t} = \dfrac{m \times \Delta v}{\Delta t}[/tex]
Where;
Δt = The time it takes the momentum of the object to change = The time the ball is in contact with the club
Substituting the known values, we get;
[tex]F_{net} = F =299.4 = \dfrac{0.061 \times 54.3}{\Delta t}[/tex]
[tex]\therefore \Delta t = \dfrac{0.061 \times 54.3}{299.4} \approx 0.011063[/tex]
The time the ball is in contact with the club = Δt ≈ 0.011063 seconds.
Select the correct answer. The rules of volleyball today have been only slightly changed from the rules when the game was A True B. False Next
Helpppp helppp I will make you a brainlist!!
Answer:
The answer is that the evil psychic is merciless, see the explanation below:)
Explanation:
When a body is about to receive an impact or collision, two important factors should be taken into consideration; the mass of the body and the velocity with which it moves. The product of mass by velocity is defined as momentum.
Therefore:
[tex]P=m*v\\[/tex]
where:
P = momentum [kg*m/s]
m = mass [kg]
v = velocity [m/s]
That is, is we are standing in front of the truck:
[tex]P_{truck}=1000*1\\P_{truck}=1000[kg*m/s][/tex]
Or in front of the meatball:
[tex]P_{meatball}=1*1000\\P_{meatball}=1000[kg*m/s][/tex]
explain a method of measuring refractive index value for a rectangular glass
Answer:
pls follow me oo
Explanation:
Step 1: Description of the Usual Method for Determining the Refractive Index of a Rectangular Glass Slab Using a Protractor.
Once the outline of the rectangular glass slab is drawn on the piece of paper (thin lines in the above diagram) and the pins removed, the following steps are carried out (refer to the above diagram):
two straight lines (AB and CD) are drawn with each line passing through one of the pairs of pin holes made by the pins and extended to the surface of the glass slab nearest the position of the two holes; these lines do not extend inside the glass slab; they represent the incident (AB) and emergent (CD) rays;straight lines (EF and GH) are drawn normal to the surfaces of the glass slab that pass through the point where the lines drawn in the previous step intersect the surfaces of the glass slab; these lines are drawn so that they lie outside and inside the glass slab;a straight line (BC) is drawn between each of the points of intersection made by the normal lines drawn in the previous step and the surfaces of the glass slab; this line represents the refracted ray;measure the angle of incidence (angle ABE) which is the angle between the incident ray and the normal that the incident ray makes with the glass surface;measure the angle of refraction (angle CBF or angle BCH) which is the angle between the refracted ray and either of the normals that the incident ray or the emergent ray makes with the glass surface;measure the angle of emergence (angle DCG) which is the angle between the emergent ray and the normal that the emergent ray makes with the glass surface; while this sub-step is not necessary for computing the RI, it is measured to show that the angle of incidence is equal to the angle of emergence and thus that the incident and emergent rays are parallel.
Following these measurements, the refractive index (RI) of the glass is obtained by taking the ratio of the sine of the angle of incidence to that of the sine of the angle of refraction.
This procedure is then repeated for a number of different incident angles to show that the ratio of the sine of the angle of incidence to that of the sine of the angle of refraction should remain constant when a number of different values are used for the incident angle.
Step 2: Description of a Procedure for Finding the Sines of the Angles Made by the Incident and Refracted Rays Without Using a Protractor.
In this procedure it is not necessary to trace the complete outline of the glass slab; only the opposite surfaces through which the light rays travel need be indicated as shown in the above diagram, where the thin lines represent these two surfaces.
The three initial sub-steps of Step 1 are carried out except that Sub-step 1 is modified by extending the lines AB and CD (broken lines) as follows:
extend the incident ray AB forwards so that it cuts the opposite face of the glass slab at point I; this is the path that the incident ray would follow if the glass slab were absent;extend the emergent ray CD backwards so that it cuts the opposite face of the glass slab at point J.
If the incident and refracted rays when extended do not cut the surfaces of the glass slab at points I and J extend the lengths representing these surfaces so that points I and J can be found.
BHCF is a rectangle formed by the surfaces of the glass slab and the normals to the surfaces at points B and C; its diagonal BC represents the path followed by the refracted ray through the glass slab.
From the geometry of the various right-angled triangles in the above diagram, note:
the angle of incidence, angle ABE, is equal to the angle FBI and its sine is equal to the ratio of lengths FI over BI;the angle of emergence, angle DCG, is equal to the angle HCJ and its sine is equal to the ratio of lengths HJ over CJ;the angle of refraction is angle CBF (or angle BCH) and its sine is equal to the ratio of lengths FC over BC (or the ratio of lengths BH over BC).
Thus, without using a protractor or having to work out the sines of angles using a calculator with trigonometric functions (or trigonometric tables), the sines of the various angles needed for calculating the RI of the glass slab can be simply found from measurements of various length.
DNT FORGET TO FOLLOW MEQuestion 1
A STUDENT TIES A STRING AROUND A WEIGHT AND SWINGS THE WEIGHT IN A CIRCLE AROUND HER BODY. IF
THE STUDENT REPRESENTS THE SUN AND THE WEIGHT REPRESENTS EARTH, WHAT DOES THE STRING
REPRESENT?
A. GRAVITY
B. RADIATION
C. ELECTRICITY
D. MAGNETISM
Answer:
A) Gravity.
Explanation:
Earth is stuck in orbit around the sun, because of the Sun's gravitational pull. In this scenario, the string represents gravity, keeping the Earth attracted towards the sun.
Hope this helps! Feel free to give me Brainliest if you feel this helped. Have a good day and good luck with your assignment :)
The student ties a string around a weight and swings the weight in a circle around her body. If the student represents the sun and the weight represents earth, the string will represent GRAVITY then.
What is gravity?In mechanics, gravity—also known as gravitation—is the constant force of attraction that pulls all things together. It has little impact on determining the intrinsic characteristics of common stuff because it is by far the weakest known force in nature.
In contrast, it governs the formations and evolution of stars, galaxies, and the entire cosmos by its extensive and ubiquitous action, which affects the trajectories of objects in the solar system and beyond the universe. All objects on Earth experience weight, or a gravitational pull that is proportionate to their mass and is imposed by the planet's mass.
As the student represents the sun and the weight represents earth, the string will represent GRAVITY then. Hence, option (A) is correct.
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According to Newton’s first law of motion, a moving object that is not acted on by an unbalanced force will..
Answer:
continue in its motion
Explanation:
Every surface has different ____________________ of friction.
I'll make u brainliest if you know it, AND HURRY
Answer:
amounts
Explanation:
every surface has different amounts of friction
hope this helps :) plz brainliest?
Answer:
Amounts of frictions
Explanation:
take for example a football player it is harder to push a sled
1. When the two cars have the same mass, what is true about their
velocities?
Answer:
I mean they have the same amount of velocity
What is the direction of the net force when one force is pulling down and one force is pushing to the right?
Answer: If the net force on an object is zero, its acceleration will be zero. For example in free fall, the net force on an object equals its weight - the one force pulling on it. If 2 forces push or pull on an object in opposite directions, and the two forces cancel .
Explanation: PLEASE MARK ME AS BRAINLIEST!
We have that the direction of the net force when one force is pulling down and one force is pushing to the right is given as
[tex]\theta=tan^{-1}(\frac{Down force}{Right force})[/tex]
From the question we are told that:
One force is pulling down and one force is pushing to the right
Generally,
When two or more forces are acting in the same direction we have that the Resultant for or net for is a sum of the forces involved
Therefore
When one force is pulling down and one force is pushing to the right the Net force is in a direction that obeys the law
[tex]\theta=tan^{-1}\frac{y-axis\ force}{x-axis\ force}[/tex]
Therefore
[tex]\theta=tan^{-1}(\frac{Down force}{Right force})[/tex]
In conclusion
The direction of the net force when one force is pulling down and one force is pushing to the right is given as
[tex]\theta=tan^{-1}(\frac{Down force}{Right force})[/tex]
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When you move your head from side to side or walk around, the apparent movement of stationary objects relative to one another is ________________________________.
Answer:
Motion parallax cue.
Explanation:
Motion parallax cue can be defined as a monocular depth cue that arises from objects moving at constant velocity (speed) across the retina or frame appearing to move faster when they are closer to the observer than they appear if they were at a farther distance.
Simply stated, motion parallax refers to a change in position due to the movement of the observer.
Hence, when you move your head from side to side or walk around, the apparent movement of stationary objects relative to one another is known as motion parallax cue.
Therefore, monocular depth cues such as motion parallax gives a valid explanation as to why stationary objects such as trees appear to move when you move your head from side to side.
For example, an observer (passenger) in a moving car looking outside the window would see stationary objects moving due to motion parallax cue.
Frequency definition class 9 sub science
Explanation:
1.
the rate at which something occurs over a particular period of time or in a given sample.
"an increase in the frequency of accidents due to increased overtime"
2.
the rate per second of a vibration constituting a wave, either in a material (as in sound waves), or in an electromagnetic field (as in radio waves and light).
"different thicknesses of glass will absorb different frequencies of sound"
Answer:
Frequency is the number of occurrences of a repeating event per unit of time.
You are riding a skateboard and hit a hole in the street, causing you to fly off the board and crash. Which law represents this action? *
Answer:
It's Laws of Motion
Explanation:
A bumble bee flaps its wings 5 times every second. What is the period of each wing flap?
Answer:
0.2 i beleive
Explanation:
1 divided by 5 is 0.2
Kylee is running on the track. She starts off at the 200m line and runs to the 800 m line. She realizes she forgot her watch so she turns around and runs to the 450m line when she realizes it was in her pocket. What was her total displacement?
Answer:
250m towards the starting point
Explanation:
Displacement is the distance from start to finish with directional orientation of a body.
Start Finish
200m → 800m
←
450m
Her total displacement would be = 450m - 200m = 250m
Displacement is therefore 250m towards the starting point
If an object travels 245 km in 5 hours, what was the speed of the object?
Answer:
49kmph
Explanation:
speed=distance/time = 245/5
can i get sum help on this please!?
1720
Explanation:
distance+speed =time
40+1680=1720
Answer:
It is simple (your not dum.b) but you just need to divide 1680 by 40 which will give you the answer which would be 42 it would take 42 hours driving constantly at 40 miles an hour
Is the normal force equivalent to the weight of an object?
Answer:
No.
Explanation:
If there are no applied forces, normal force is usually equivalent to the weight of the object but if there are outside force (force that makes the object to move) especially if it's inclined, then the inclined force would then affect the normal force.
ADD NOTE
QUESTION GUIDE
EXIT TI
1. A 15 N force is exerted on a box, moving it 25m in the same direction.
According to the above diagram, what is the magnitude of work done on the box?
Answer:
375J
Explanation:
Given parameters:
Force exerted on the box = 15N
Distance moved = 25m
Unknown:
Magnitude of work done on the box = ?
Solution:
Work done is a function of the force applied to move a body through a distance.
Work done = Force x distance
Now;
Work done = 15 x 25 = 375J
A nickel atom has an atomic number of 28 and an atomic mass of 59. What
is the structure of this atom?
A. It has a central nucleus composed of 28 protons and 31 neutrons,
surrounded by an electron cloud containing 28 electrons.
B. It has a central nucleus composed of 28 protons and 28 neutrons,
surrounded by an electron cloud containing 31 electrons.
C. It has a central nucleus composed of 31 protons and 28 neutrons,
surrounded by an electron cloud containing 28 electrons.
D. It has a central nucleus composed of 28 protons and 59 neutrons,
surrounded by an electron cloud containing 28 electrons.
A nickel atom has an atomic number of 28 and an atomic mass of 59. It has a central nucleus composed of 28 protons and 31 neutrons, surrounded by an electron cloud containing 28 electrons.
What is an atom?The atom consists of matter that may be split without releasing electrical charges.
It's also the smallest unit of matter with chemical element features. As a result, the atom is the fundamental unit of science.
In the nucleus, proton and the neutron is existing. The condition of the atom to be electrically neutral is that the number of the proton and electron should be the same.
A nickel atom has an atomic number of 28 and an atomic mass of 59. In the nucleus, proton and the neutron is existing,the atom is the fundamental part of the particle.
In that, condition, It has a central nucleus composed of 28 protons and 31 neutrons, surrounded by an electron cloud containing 28 electrons.
Hence, option A is correct.
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