Answer:
c) an almost constant downward force of gravity along with an upward force that steadily decreases until the ball reaches its highest point; on the way down there is only a constant downward force of gravity.
Explanation:
When the boy throws the ball upward, there are two forces acting on the ball. First one is the force of gravity, which is constant and equal tot he weight of the ball, acting down. The second force is the force with which the boy throws the ball. This force acts upward and decreases as the ball moves up. This force becomes zero when the ball reaches highest point.
While, on its way down the ball has only one force acting on it. That force is the constant force of gravity acting downward. This gravity force is equal to the weight of the ball.
Hence, the correct option is:
c) an almost constant downward force of gravity along with an upward force that steadily decreases until the ball reaches its highest point; on the way down there is only a constant downward force of gravity.
The force acting on the ball is an almost constant downward force of gravity along with an upward force that steadily decreases until the ball reaches its highest point; on the way down there is only a constant downward force of gravity. Thus the option C is the correct option.
Given,
Force exerted by the air is negligible.
Now the forces acting on the ball after the realese,
Gravity- This force acts on the body and will remain constant until the ball is in the air. This force is equal to the weight ([tex]W[/tex]) which is equal to the product of the mass [tex]m[/tex] and the gravitational force [tex]g[/tex] of the earth.
[tex]W=mg[/tex]
Force applied by the boy- This is the force by which the boy through the ball. This will act upward and keep on decreasing as the ball moves upward. This force becomes zero when the body reaches the highest point.Now after reaching the highest point, the ball starts to come down. In this case, only one force will act on it which is the gravity force and this is equal to the weight of the body.
Hence, the force acting on the ball is an almost constant downward force of gravity along with an upward force that steadily decreases until the ball reaches its highest point; on the way down there is only a constant downward force of gravity. Thus the option C is the correct option.
For more about the gravity follow the link below-
https://brainly.com/question/1479537
plz help i really need this
Answer:
The reactivity of metals increases as you move left in a period and as you move down in a group, so Marie needs to know the period and group of the element inside each box. Boxes that show locations in groups 1 or 2 or in period 8 contain the most reactive elements.
Explanation:
Answer:
The Group Number of the elements.
Explanation:
If Marie knew the group number of the elements, then she could determine the amount of valence electrons each element has and their reactivity rate. For example, if one box tells her that an element is located in group 18, then she could determine that the element is not very reactive. This is because elements in group 18 have 8 valence electrons, which makes them stable/unreactive.
Hope this helps!
What do signal trainees do
Answer:
A signal apprentice works for a rail company, learning the duties of a signal maintainer through on-the-job training and experience. As part of this apprenticeship, you work on a railway to assist a seasoned signal maintainer as they install, repair, inspect, and test signal equipment.
Explanation:
If the x and y vector components of Vector A are 11 and 7,
what is the magnitude of Vector A? Round your answer to the
nearest hundredth.
Answer:
R=13.04
Explanation:
Using pythagoras theorem
Assuming the vector A is the resultant force R
R^2=11^2+7^2
R^2=121+49
R^2=170
R=13.038
R=13.04
1. Which of the following is a unique feature of light waves?
Answer: they are compression waves
Explanation:
The unique property of light waves is that they do not require a medium for propagation.
Generally; waves are classified into electromagnetic waves and mechanical waves. Mechanical waves require a medium of propagation while electromagnetic waves do not require a medium for propagation.
Also, waves are classified into transverse waves and longitudinal waves. In transverse waves, the disturbance is perpendicular to the wave front while in longitudinal or compressional waves, the disturbance is parallel to the wave front.
Light is both an electromagnetic wave and a transverse wave. This means that it requires no material medium for propagation. This is the unique property of light waves.
Learn more: https://brainly.com/question/2673886
You travel from Point A to Point B to Point C. What is your
displacement?
7 m
3 m
4m
5 m
12 m
Answer:
12m is your displacement
Answer:
5
Explanation:
Its a shortcut from A to C........I think
A merry go round at the park is spinning. You stand on the outer edge and are traveling at constant speed of 5 m/s. You walk halfway toward the center. What happened to your acceleration?
Answer:
a' = 2a
Explanation:
The acceleration during this circular motion is the centripetal acceleration. Initially, the acceleration will be given as:
a = v²/r --------------------- equation (1)
Where,
a = centripetal acceleration at outer edge
v = speed of merry go round = 5 m/s
r = distance from center of round to person (outer edge)
Now, when the person moves half way towards center. Then, the acceleration becomes:
a' = v²/r'
where,
r' = r/2
Therefore,
a' = v²/(r/2)
a' = 2v²/r
using equation (1):
a' = 2a
Un prisma rectangular de cobre, de base igual a 36 centímetros cuadrados y una altura de 10 cm se sumerge hasta la mitad por medio de un alambre en un recipiente que contiene alcohol ¿que volumen de alcohol desaloja?
La respuesta correcta es 180 centímetros cúbicos o 180 [tex]cm^{3}[/tex]
Explicación:
El primer paso para saber cuanto alcohol desaloja el prisma es calcular el volumen total del prisma. El volumen se puede encontrar usando la formula V (Volumen) = B (base) x h (altura). El proceso se muestra a continuación:
V = B x h
V = 36 [tex]cm^{2}[/tex] x 10 cm
V= 360 [tex]cm^{3}[/tex]
Finalmente, el volumen total del prisma debe dividirse en 2 considerando que solo la mitad del prisma fue sumergida y esta mitad equivale al volumen del alcohol desplazado.
360 [tex]cm^{3}[/tex] ÷ 2 = 180 [tex]cm^{3}[/tex]
El volumen de fluido desplazado es de 180 cm^3.
Sabemos que el objeto va a desplazar su propio volumen de fluido. Por lo tanto, necesitamos obtener el volumen del objeto a, este es el volumen del fluido que eventualmente será desplazado por el sólido.
El volumen del sólido es;
V = 36 cm^2 * 10 cm^2 = 360 cm^3
desde que se sumergió a la mitad, volumen de alcohol desplazado = 360 cm^3/2 = 180cm^3
Obtenga más información sobre el volumen: https://brainly.com/question/7932885
If a 50 N force was applied to a really massive object as well as a tiny object, what can you say
about the object's acceleration?
Answer:
The tiny object's acceleration will be much greater.
Explanation:
Because of Newton's second law of motion, (which is F=ma or Force= Mass*acceleration), then if the force maintains the same (which in this case it does, because it says 50 N to both obejcts) and one mass was much greater than the other, then the ould be less for the more massive object and much greater for the lighter object.
For example: If 50 N were applied to a 500 kg object and a 50 kg object, then theformulas for each (respectively) are:
50 = 500*acceleration
and
50 = 50*acceleration
(Because of Newtons Second Law of Motion)
Then, solving for the equations, we get for equation 1:
Acceleration = .1 m/s^2
And for equation 2:
Accleration = 1 m/s^2
Thus, you can see that more massive objects (when applied he same amount of force as the smaller object) clearly have less accleration than the smaller objects.
Dorji weight 1500n.if the total surface area of soles of his feet is 0.5 m2 what is the pressure exerted by his body on the ground
Answer:
P = 3000 Pa
Explanation:
Weight of Dorji, W = F = mg = 1500 N
The total surface area of soles of his feet is 0.5 m²
We need to find the pressure exerted by his body on the ground. The pressure is equal to the force acting per unit area. So,
[tex]P=\dfrac{1500\ N}{0.5\ m^2}\\\\=3000\ Pa[/tex]
So, the pressure exerted by his body on the ground is 3000 Pa.
An apple and a stone dropped from certain height accelerates:Required to answer. Single choice.Immersive Reader
(1 Point)
equally.
differently.
depending on density.
depending on the position of the sun.
An apple and a stone dropped together from any height accelerate equally.
In order for convection to transfer heat, particles need to
absorb solar and fossil energy
circulate and move within a liquid or gas
make contact with the heat source
transmit electromagnetic waves
Answer:
the answer is b as cenvection only occurs through movement of liquids and gases
Explanation:
Answer:
the answer is b
PLEASE HELP ASAP I WILL GIVE BRAINLIEST!!
Answer:
Q1: I'm going to say the fence is a polarizing filter.
Q2: On the second question: (b). BTW, It's not a very well-phrased question (and I'm a particle physicist, so...)
Explanation:
Q1:
So... hard to say for sure the intent here without knowing what you've been learning in class, but a frisbee - being a flat disk - will only go through the fence if it is oriented as shown, much like polarized light will only go through a polarizing filter if the EM waves are polarized in the direction that they will pass through a polarizing filter.
Q2:
It's not a) because ALL waves require a source of energy.
b) is for sure true and is about energy transfer - mechanical waves need a medium (like water) but EM waves do not. (Early on they thought maybe there was a medium for EM waves... they called it "aether" ... but it was proven via the Michealson-Morley experiment that no the speed of light was an absolute constant - fundamental to special relatively - which meant that light did not travel in any medium!)
(c) - depends on what you mean by "vibration", but yeah... EM waves result in varying electric fields for an observer. However, nothing to do with energy transfer per se (except that those varying fields are what transfer energy to objects that experience them...)
(d) - As above, the speed of light is a constant - cannot change speed ever *in a vacuum*. However, the speed of light is different in various materials, and can be bent (refracted) or reflected, which means the fields change direction in interacting with matter, although they do not change speed or direction "on their own" (in a vacuum). Similarly, mechanical waves can change speed or direction when there are changes or discontinuities in the media they travel in. So, arguably about energy transfer (the direction and speed related to the direction and rate of energy transfer) but not really different between EM and mechanical waves.
Anyway, like I said, it's not a very clear question, so YMMV with my advice here, but (b) is for sure the best single choice.
Un automóvil circula a una velocidad de 60 km/h durante 1 hora y 15 minutos, después se para durante 5 minutos y luego regresa hacia el punto de partida a una velocidad de 10 m/s durante 45 minutos. Halla: a) La posición final. b) La distancia recorrida. c) La velocidad media.
Answer:
(a) 48 km
(b) 102 km
(c) 48.96 km/h.
Explanation:
Assuming that at first, the car travels from point A to point B, then the cat returns from point B to point C.
As the car traveled from point A to point B in 1 hour 15 minutes with a speed of 60 km/h.
Using distance = speed x time, so
Distance traveled from A to B is
[tex]d_{AB}= 60 x 1.25=75[/tex] km [ as time = 1 h 15 min = 1.25 h]
Stop time at point B is 5 minutes.
For the return journey, from point B to C:
Speed = 10 m/s
Time = 45 minutes = 45 x 60 seconds = 2700 seconds
Distance traveled from point B to C is
[tex]d_{BC}=[/tex] 10 x 2700 = 27000 meters
as 1000 meters = 1 km, so
[tex]d_{BC}=[/tex] 27 km.
(a) The final position of the car from the starting point A is the distance between points A and C.
[tex]d_{AC}=[/tex]75 -27=48 km.
Hence, the car is 48 km away from point A.
(b) Total distance traveled,
[tex]d= d_{AB}+d_{BC}=[/tex]75+27=102 km.
(c) Total time taken
t= 1.25 hour + 5 minutes + 45 minutes
= 5/4 hour + 5/60 hour + 45/60 hour [ as 1 hour = 60 min]
=25/ 12 hours.
Total distance traveled, d= 102 km [ from part (b)]
Average speed = (Total distance traveled)/(Total time taken)
=102/ (25/12)= 48.96 km/h.
Hence, the average speed of the car is 48.96 km/h.
Which of the examples below is an example of convection?
A)
rubbing your hands together.
B)
heating a fish tank.
basking in the sun.
D)
striking a match.
The rate of change in position at a given point in time
Answer:
Velocity
Explanation:
The rate of change in position at a given point in time is called velocity.
What important example, shown in the picture, is given regarding a real-life
connection to these elements?
Answer:
Explanation:
There is no picture!
A motorcyclist sees a branch in the road and hits the brakes, slowing down at -6.42 m/s. if it takes him 2.85 seconds to stop, what was his starting velocity?
Use the definition of average acceleration:
a = ∆v / t
If v is the starting speed, then ∆v = 0 - v, so solve for v :
-6.42 m/s² = (0 - v) / (2.85 s)
v = (6.42 m/s²) (2.85 s)
v ≈ 18.3 m/s
activity 1 more or less, pls answer this ASAP
Answer:
ididate is a good one and
The convection zone is the outer most layer of the suns blank hot gases rise and then blank hear the loops form by singing cool gas causes blank to move towards the sun surface
Answer:
Explanation:
The sun is made up of 6 parts. Namely:
The coreThe radiation zoneThe convection zoneThe photosphereThe chromosphere and The coronaThe convection area is just above the radiation zone. As materials from the suns core are heated, they rise above the radiation zone towards the EDGE of the convection area then sinks back again into the radiative zone for more heat.
The radiative zone is 12.6 million Fahrenheit hot and is just above the core.
The core of the son is not solid but plasma whose motion is like gas. Its temperature stands at 48 million Fahrenheit
Cheers
State the career function of computer engineering
Answer:
Computer engineer duties include doing research on software and computer hardware. Designing and testing computer hardware components. Like processors, circuit boards, memory devices and routers. Writing and testing software mobile devices and computers.
Explanation:
Answer:
Computer engineer duties include: Conducting research on software and computer hardware. Designing and testing computer hardware components, such as processors, circuit boards, memory devices and routers. Writing and testing software for mobile devices and computers.
Explanation:
You fire a paintball from a paintball gun straight up into the air at 25.0 m/s. What is the ball velocity at the higher point that the ball reaches? Pleaseee helppp mee
Given :
You fire a paintball from a paintball gun straight up into the air at 25.0 m/s.
To Find :
What is the ball velocity at the higher point that the ball reaches.
Solution :
We know, when ball is moving upward acceleration due to gravity is applied downward.
So, the ball will decelerate and when ball reaches maximum height its velocity will become zero.
Therefore, ball velocity is 0 m/s at maximum height.
Hence, this is the required solution.
Kinetic energy is the energy an object has due to its
Answer:
potential energy or stored energy
Explanation:
Answer:
Motion
Explanation:
Edge2021
Halp meeeeeeeeeeeeeeeeee
Answer:
1º all
2º 1
3º 2
4º the same
Explanation:
A space shuttle travels around the Earth at a constant speed of 28000 kilometers per hour. If it takes 90 minutes to complete one orbit, how far is its journey around Earth?
42000 kilometers
Explanation:
distance is velocity × time
28000 ×1.5
42000
remember to match units
thats why i wrote 1.5 hours instead of 90minutes
an athlete of mass 70kg runs at a velocity of 6ms5-1 calculate the kinetic energy of the athlete.
If a bicyclist travels at 15 km/hr, how long will it take her to travel 30 km?
Answer:
The answer is 2 hoursExplanation:
To find how long it took we use the formula
[tex]t = \frac{d}{v} \\ [/tex]
d is the distance
v is the velocity
From the question we have
[tex]t = \frac{30}{15} \\ [/tex]
We have the final answer as
2 hoursHope this helps you
Which event happens FIRST in the presidential election process?
A. The president is chosen by popular vote.
B. Americans vote for electors.
C. All 50 governors prepare their states' Certificates of Ascertainment.
D. Congress gathers to count the electoral votes.
What are the three stages of matter and how?
Answer:
Solid, Liquid and Gas
Explanation:
They are the 3 states or stages of Matter
A balloon is launched at 2.5 m every second, how far did it travel in 10 seconds?
Answer:
25 meters
Explanation:
1 sec is 2.5, 1x10 so 2.5x10=25
what was the temperature changes in Celsius degrees if it is
changed from 44°F to -56°F?
Answer:
so, the answer is 56 whole number if round it, or 55.6(round it to 10th decimal)
Explanation:
(formula, idk it is wrong or right) °C =°F - 32 then / 1.8000
44°F = 6.6666666667°C
-56°F = -48.888888889°C
So, if u want whole number as the answer
it is something like 6.6666666667°C + 48.888888889°C = 55.5555555557 °C
so, so, the answer is 56 whole number if round it, or 55.6(round it to 10th decimal)