Answer: a and d
Explanation: A.) the power lines themselves
B.) the wooden pole that supports the lines
C.) the rubber soles on the worker’s boots
D.) the metal tools the worker uses
E.) the wooden ladder leaning against the lines
this is a device used to change the flow of electricity through a circuit
Answer:
Transformers are devices used in electrical circuits to change the voltage of electricity flowing in the circuit. Transformers can be used either to increase the voltage or decrease the voltage.
How do protons, neutrons, and electrons determine the properties of an atom?
Answer:
Look below
Explanation:
The number of electrons, determines the chemical properties of the atom. Protons contribute to the mass of an atom and provide the positive charge to the nucleus. The number of protons also determines the identity of the element. Electrons have a negative charge. Since the atom electrically neutral, the number of electrons must be equal to the number of protons. The electrons arrange themselves in energy levels around the nucleus.
Answer:
Look above
Explanation:
The number of electrons, determines the chemical properties of the atom. Protons contribute to the mass of an atom and provide the positive charge to the nucleus. The number of protons also determines the identity of the element. Electrons have a negative charge. Since the atom electrically neutral, the number of electrons must be equal to the number of protons. The electrons arrange themselves in energy levels around the nucleus.
HURRY!
Which are characteristics of a ray when it hits a boundary and reflects, but not when it hits the boundary and refracts? Check all that apply.
changes direction
changes speed
does not change direction
does not change speed
bounces off the boundary
passes through the boundary
Answer:
changes direction
changes speed
bounces off the boundary
Answer:
B. changes speed
F. passes through the boundary
Explanation:
(This Answer is correct on Edge 2021)
A. "changes direction" is INCORRECT bc while the incident ray does change direction in refraction, it also changes direction in reflection, and we require only the characteristics that are present in refraction and not reflection.
in the lab you will use a cart and track to explore various aspects of motion you will measure and record the time it takes the cart to travel certain distances and then complete some calculations
Answer:
Hii! ^^
Explanation:
It is given that by using track and cart we can record the time and the distance travelled and also the speed of the cart can be recorded. With all this data we can solve questions on the laws of motion.
Like using the first law of motion we can determine the force of gravity acting on the cart that has moved a certain distance and the velocity or the speed of card has already been registered and since time is known putting the values in formula would help us calculate the gravitational pull acting on cart.
Happy To Help! ^^
The fins of a car radiator are painted black because black objects are good?
Answer:
because it emits the most heat thru radiation
Un bloque de 30.0 kg esta sobre un plano inclinado 28 grados con respecto a la horizontal, si el coeficiente de fricción cinética es 0.200, calcula la fuerza paralela al plano que se debe ejercer sobre el bloque para que suba con velocidad constante.
Responder:
229.17NExplicación:
Las fuerzas que actúan paralelas al plano son la fuerza de movimiento y la fuerza de fricción.
La fuerza de movimiento Fm = Wsinθ y la fuerza de fricción Ff = nR donde;
W es el peso del objeto = mg = 30.0 * 10
W = 300N
θ es el ángulo de inclinación = 28 °
n es el coeficiente de fricción = 0,20
R es la reacción normal = Wcosθ
La fuerza paralela al plano que se debe ejercer sobre el bloque para que se eleve con rapidez constante será la suma de la fuerza de movimiento y la fuerza frictioal (son las dos fuerzas que empujarán el cuerpo hacia arriba del plano)
Fuerza total requerida = Fm + Ff
Fuerza total requerida = Wsinθ + n (Wcosθ)
Fuerza total requerida = 300sin28 ° + 0.2 (300cos28 °)
Fuerza total requerida = 140,84 + 52,98
Fuerza total requerida = 229.17N
Por tanto, la fuerza paralela al plano que se debe ejercer sobre el bloque para que se eleve con rapidez constante es aproximadamente 229,17 N
Can someone help me with this motion graph please
Answer:
24 meters
Explanation:
From 0 - 4 secs. the distance traveled forward 8 meters. From 4 - 6 secs. the distance traveled another 8 meters forward. Then from 6 - 10 secs. the distance traveled backward 8 meters for a total of 24 meters.
Consider three force vectors F~ 1 with magnitude 43 N and direction 38◦ , F~ 2 with magnitude 26 N and direction −140◦ , and F~ 3 with magnitude 27 N and direction 110◦ . All direction angles θ are measured from the positive x axis: counter-clockwise for θ > 0 and clockwise for θ < 0. What is the magnitude F of the net force vector F~ = F~ 1 + F~ 2 + F~ 3? Answer in units of N.
Answer:
34.70 N
Explanation:
Given :
F~ 1 = 43 N in direction 38◦
F~ 2 = 26 N in direction −140◦
F~ 3 = 27 N in direction 110◦
Therefore,
F~x = 43 cos (38) + 26 cos (-140) + 27 cos (110)
= 43 (0.7) + 26 (-0.7) + 27 (-0.3)
= 3.8
F~y = 43 sin (38) + 26 sin (-140) + 27 sin (110)
= 43 (0.6) + 26 (-0.6) + 27 (0.9)
= 34.5
so, F~ = [tex]$ \sqrt{3.8^2 + 34.5^2}$[/tex]
= 34.70 N
In a swimming meet, the swimmers swim a total of 8 laps of a 50-meter-long swimming pool. What is the distance traveled by a swimmer in this meet? What is swimmer's displacement?
Explanation:
It is given that, swimmers swim a total of 8 laps of a 50-meter-long swimming pool. We need to find the distance traveled by a swimmer in this meet.
Distance = total path covered during entire journey
In every lap he covers a distance of 50 m. It means in 8 laps it will cover 8×50 = 400 meters.
Displacement = shortest path covered
After 8 laps, the swimmer ultimately comes to the starting point. It means its displacement is equal to 0.
50 POINTS
A graph of velocity versus time for an object shows a straight line with positive slope. What does that indicate about the acceleration of the object?
- the acceleration is changing
- the acceleration is zero
- the acceleration is constant and positive
Answer:
The acceleration is constant and positive
Explanation:
The straight line indicates that the acceleration is constant, while the positive slope indicates that the line is positive.
Answer:
^^^
Explanation:
sketch a velocity time graph for the motion of the body . from the graph explain each step, calculate the total distance covered by the body
Answer: please find the attached file for the solution.
Explanation:
In a velocity time graph for the motion of the body, the total distance covered by the body is area under the graph.
Please find the attached file for the solution.
While John is traveling along a straight inter-
state highway, he notices that the mile marker
reads 257 km. John travels until he reaches
the 145 km marker and then retraces his path
to the 175 km marker.
What is John's resultant displacement from
the 257 km marker?
Answer in units of km.
Answer:
Explanation:
The first displacement when the mile reading changes from 257 to 145
= 257 - 145
= 112 km
Then he turns back . This time the displacement will be negative .
The mile reading changes from 145 to 175
displacement = - ( 175 - 145 )
= - 30 km
Final displacement = 112 - 30
= 82 km .
How long would it take a car going 50 km/h to travel 70 km ?
Answer:
Hey there!
d=rt
t=d/r
t= 70/50, or 1.4
It would take the car 1.4 hours to travel 70 km.
Let me know if this helps :)
Describe two of Tesla's inventions that influenced
technology and are still in use today.
Answer:
Tesla perfected alternating current (AC) technology, which now provides electricity to all homes and appliances. He developed the fluorescent lightbulb, which is energy-efficient and cost-effective. The electric motor, which he invented, now powers appliances, machines, tools, and some cars. Tesla also built a hydroelectric power plant to generate electricity from the force of water. Tesla also studied X-rays, radios, and wireless technology.
Explanation:
i just answered it this is the sample response believe me edge 2021
Three students attempt to define what it means for lines lll and mmm to be perpendicular. Can you match the teacher's comments to the definitions? Definition of perpendicular lines Teacher's comments
Incompletevquestion. However, I inferred from a general perspective about perpendicular lines.
Explanation:
Put simply, perpendicular lines are lines that are at right angles (90°) to each other. Thus, we could say based on this definition that for lines lll and mmm to be perpendicular they intersect and be at right angles (90°) to each other as found on the attached image.
Answer:
Daniela's Definition: AB is perpendicular to CD if the measure of <AOC equals the measure of <AOD.= Well Done! Because the measure of <COD...
Ori's Definition: AB is perpendicular to CD if AB and CD intercept perfectly sideways.= Please rework your ….
Kaori's definition: AB is perpendicular to CD if one line can be mapped to the other by a rotation about point O of 90 degrees.= Well done! I hadn't previously considered defining...
Explanation:
Kahn Academy
.2, A car starting from rest has an acceleration of
0.5m/s2, what will be its final velocity after 5
seconds? What distance will be covered by
the car at the end of 5 seconds?
Answer: 2.5 m/s and 6.25 m
Explanation:
u = 0
a = 0.5 m/s²
t = 5 s
v = u + at
= 0 + 0.5 × 5
= 2.5 m/s
s = ut + 1/2 at²
= 1/2 × 2.5 × 5
= 6.25 m
Which option is a force? O A. Mass O B. Velocity O C. Acceleration O D. Weight
Answer:
The answer is D
Explanation:
The answer is D because weight has a lot of amount of force.
Answer:
the answer is D
Which material will displace a volume of water? Which material will displace a volume of water less than its own volume? Which material will displace a volume of water equal to its own volume? Which material will displace a volume of water greater than its own volume?
Answer:
1. all of them
2. cork and wax
3. iron, lead, and aluminum
4. none of them
Explanation:
1.Which material will displace a volume of water? all of them
When an object is introduced into a container with a volume of water, a volume of liquid equal to the volume of the object is displaced
2.Which material will displace a volume of water less than its own volume?
cork and wax
because the density of the object is less than that of the displaced liquid
3.Which material will displace a volume of water equal to its own volume?
iron, lead, and aluminum
because Arquimedes's principle: any body plunged inside a fluid in this case water experiences an ascending force called push, equivalent to the weight of the fluid removed by the body
4.Which material will displace a volume of water greater than its own volume?
None of them
Answer:
1. all of them
2. cork and wax
3. iron, lead, and aluminum
4. none of them
Explanation:
75 kg + 1352 g = ______________g?
Answer:
76352 g
Explanation:
Start by reducing the first quantity to grams, since a) additions can not be performed among quantities given in different units, and b) the answer is required in grams so better to express everything in grams.
75 kg = 75000 g
Then the addition becomes: 75000 g + 1352 g = 76352 g
work done as mass 1 moves to mass 2. the gravitational force between two point masses separated by a distance r is proportional to
Answer:
gravitational force
Air is _______________ and not _______.
You are lying on a beach, your eyes 20cm above the sand. Just as the Sun sets, fully disappearing over the horizon, you immediately jump up, your eyes now 150 cm above the sand, and you can again just see the top of the Sun. If you count the number of seconds until the Sun fully disappears again, you can estimate the Earth’s radius. But for this Problem, use the known radius of the Earth to calculate the time t.
Answer:
The time is [tex]t = 8.78 \ s[/tex]
Explanation:
From the question we are told that
The initial height of the eye is [tex]h _1 = 20 \ cm = 0.2 \ m[/tex]
The height of the eye when you jumped up is [tex]h_2 = 150 \ cm = 1.5 \ m[/tex]
An illustration of this question is shown on the first uploaded image
Generally the radius of the earth is [tex]R = 6.38*10^{6} \ m[/tex]
Now from the diagram first sun means first time you saw the sun and the second sun means second time you saw the sun then
H is the height increase when you quickly stood up which is mathematically evaluated as
[tex]H = h_2 -h_1[/tex]
[tex]H = 1.5 - 0.2[/tex]
[tex]H = 1.3 \ m[/tex]
Also [tex]\theta[/tex] i the angular displacement between the first and second position and from geometry it is also the angle at one of the sides of the right angle triangle
Applying Pythagoras theorem
[tex](R+H)^2 = K^2 + R^2[/tex]
=> [tex]R^2 + H^2 + 2RH = K^2 + R^2[/tex]
Now given that H is very small compared to R the we ignore [tex]H^2[/tex]
So
[tex]R^2 + 2RH = K^2 + R^2[/tex]
=> [tex]K = \sqrt{2RH}[/tex]
=> [tex]K = \sqrt{2 * 6.38*10^6 * 1.3 }[/tex]
=> [tex]K = 4073 \ m[/tex]
Now the [tex]\theta[/tex] is mathematically evaluated using SOHCAHTOA as follows
[tex]tan \theta = \frac{K}{R}[/tex]
[tex]\theta = tan^{-1}[ \frac{K}{R}][/tex]
=> [tex]\theta = tan^{-1}[ \frac{ 4073}{6.38*10^{6}}][/tex]
=> [tex]\theta = 0.0366^o[/tex]
Generally
[tex]1 \revolution\ around \ the\ earth = 24 \ hours = 86400 \ seconds = 360 ^o[/tex]
So
[tex]\frac{\theta}{360} = \frac{t}{86400}[/tex]
=> [tex]\frac{0.0366}{360} = \frac{t}{86400}[/tex]
=> [tex]t = 8.78 \ s[/tex]
According to Newton’s third law of motion, what happens whenever one object exerts a force on a second object?
Answer:
When one object exerts a force on another object, the second object exerts the same size force on the first object
Explanation:
1150 g - 0.652 kg = ______________g?
Answer:
The required answer is 498 gram
What is the kinetic energy of a 150 kg bear running at 3 m/s?
Explanation:
KE = ½ mv²
KE = ½ (150 kg) (3 m/s)²
KE = 675 J
The kinetic energy of a 150 kg bear running at 3 m/s would be 67.5 Joules.
What is mechanical energy?Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total potential energy stored energy in the system which is represented by total potential energy
ME = KE + PE
As given in the problem we have to calculate the kinetic energy of a 150 kg bear running at 3 m/s
K.E =?
m = 150 kg
v = 3 m/s
The total kinetic energy is given by the formula
KE = 1/2mv²
By substituting the respective values in the formula of kinetic energy
K.E =?
m = 150 kg
v = 3 m/s
KE =1/2×150×3²
KE= 67.5
Thus, The kinetic energy of a 150 kg bear running at 3 m/s would be 67.5 Joules.
Learn more about mechanical energy from here
brainly.com/question/12319302
#SPJ5
Through which substance will sound travel the fastest? A)Copper wires B)Sea water C)Hot air D)Cold air
Answer:
A. Copper wires
Explanation:
the the answer is copper wires because sound waves travel the slowest through gases, faster through liquids, and fastest through solids and copper wire is a solid.
A football coach walks 24 meters eastward, then 12 meters westward, then 36 meters eastward, and finally 22 meters westward. What is the magnitude and direction of the displacement?
Answer:
Magnitude = 26 m
Direction = eastward
Explanation:
Given that a football coach walks 24 meters eastward, then 12 meters westward, then 36 meters eastward, and finally 22 meters westward. What is the magnitude and direction of the displacement?
Let eastward be positive and westward be negative.
Magnitude = 24 - 12 + 36 - 22
Magnitude = 60 - 34
Magnitude = 26
Since the answer is positive, the direction will be eastward.
Therefore,
Magnitude = 26 m
Direction = eastward
I'm taking physics and trying to figure out the 4 questions to this problem.
Answer:
Explanation:
At t = 1 velocity = 0
At t = 3 velocity = 3
slope of the line = 3-0 / 3-1 = 3/2
At t = 2
velocity = 3/2 x ( 2 - 1 )
= 1.5 m /s
velocity at t = 2 is 1.5 m /s
Position at t = 2 :
displacement at t = 2
area of graph upto t = 2
= 1 / 2 x 1 x 1.5 = .75
position at t = 2 :
= initial position + displacement
= 10 + .75 = 10.75 m
position at 6 s :
displacement at t = 6
area of curve upto t = 6
= 1 / 2 x 2 x 3 + 3 x 3 + 1/2 x 3 x ( 4.5 - 3 )
= 3 + 9 + 2.25
= 14.25 m
position at t = 6
= initial position + displacement
= 10 + 14.25 = 24.25 m
position at 9 s :
displacement at t = 9
area of curve upto t = 9
= 1 / 2 x 2 x 3 + 4 x 3 + 1/2 x 4 x ( 5 - 3 )- 1/2 x 2 x 1.5
= 3 + 12 + 4 - 1.5
= 17.5 m
position at t = 9
= initial position + displacement
= 10 + 17.5 = 27.5 m
How balance of oxygen and carbon dioxide in the atmosphere is maintained?
Answer: The balance of oxygen and carbondioxide is made due to respreration and photosinthesis. As we leave carbon dioxide and take in oxygen the ballance of carbon dioxide and oxygen is made. And during the photosinthesis of plants the balance of carbon dioxide and oxygen is made.
456.7 in scientific notation
456.7 = 4.567 x 10² in scientific notation