Answer:
B IS CORRECT
Explanation:
example forces that can make objects move without touching them?
Answer:
Gravity such as magnets
Explanation:
Hope this helped
During a demonstration of Newton’s laws of motion, a student used the setup shown in Figure 1. The student flicked the index card with a fingertip, and the coin fell straight down into a plastic cup as shown in Figure 2.
A: A falling body accelerates at a constant speed.
B: The motion of an object is constantly changing due to magnetic forces.
C: The force friction causes an object in motion to move faster.
D: An object remains at rest, or at a constant speed, an unbalanced force acts on it.
Answer:
D. An object remains at rest, or at a constant speed, an unbalanced force acts on it.The coin was at rest until the card was removed, so it tended to remain in the same location. Once the card was gone, the unbalanced force of gravity caused the coin to fall.
I hope this helped!+*♡
Two point charges, the first with a charge of +3.50 10-8 C and the second with a charge of -4.50x10-6C, are separated by 25.0 cm. Find
the magnitude of the electrostatic force experienced by the positive charge.
a. 6.32 N
b. 2.27 N
c. 3.42 N
d. 4.45 N
Answer:
b. 2.27 N
Explanation:
Fe = (k)(Q1)(Q2) / d²
k ≈ 9 × 10⁹ N m² / C² [Coulomb's Constant] or 8.98 × 10⁹ (nearest hundredth).
q = particle charge [Coulombs; C]
d = distance [Meters; m]
Fe = Electrostatic force [Newtons; N]
________________________________
Fe = (9×10⁹)(3.5 × 10^(-8)(-4.5 × 10^(-6))/(.25)² N =
(9)(3.5)(-4.5) × (10^(9))(10^(-8))(10^(-6) / (.25)² N =
(9)(3.5)(-4.5) × (10^(9 - 8 - 6)) / (.25)² N =
(-141.75) × 10^(-5) / (.0625) N =
141.75 × 10^(-5) / (.0625) N
[opposite direction] =
(1.4175 × 10^(2)) × 10^(-5) / (.0625) N
[opposite direction] =
1.4175 × 10^(-3) / .0625 N
[opposite direction] =
1.4175 × 10^(-3) / 6.25 × 10^(-2) N =
14.175 / 6.25 N [opposite direction] =
2.268 N ≈ 2.27 N [opposite direction].
As distance ________________ between two objects, gravitational force will _________________. *
1 point
a. increases, increase
b. increases, decrease
c. decreases. increase
Answer:
b. increases, decrease
Explanation:
Some people say you can get HIV from insect bites. True or false? Why?
Pls help! Will mark brainliest!!
Answer:
I would say all of the above
Explanation:
I think this bcuz it says it should be useful and comfortable and so four is correct bcuz they need to know if it feels good and also if it possibly would give a rash or worse. Next, all the other ones would prove how well the suits work in the conditions need for use.
Hope this helps.
No Links!!!!!!!!!!!!!!!!!!!!!!!!!! Can you guys help me with this? Please :)
Answer:
C and True :)
Explanation:
Hope you got it right!
Please help choose one
A B C or D
???
Pushing a baby on a swing is easier than pushing an adult on the same swing.
Water spills from a glass carried by someone who is walking steadily and suddenly stops short.
When thrown with the same force, a soccer ball accelerates more than a bowling ball.
A magician pulls a tablecloth out from under a dish on a table without disturbing the dish.
A rocket launches into space, pushing fuel exhaust in one direction and the rocket in the opposite direction.
A book rests on top of a shelf and does not move until a student accidentally knocks it off.
Answer:
Law 2:
Pushing a baby on a swing is easier than pushing an adult on the same swing. Water spills from a glass carried by someone who is walking steadily and suddenly stops short.
Law 2:
When thrown with the same force, a soccer ball accelerates more than a bowling ball.
Law 1:
A magician pulls a tablecloth out from under a dish on a table without disturbing the dish.
Law 3:
A rocket launches into space, pushing fuel exhaust in one direction and the rocket in the opposite direction.
Law 1:
A book rests on top of a shelf and does not move until a student accidentally knocks it off.
Explanation:
Newton's laws of motion:
Law 1: Law of inertia
Law 2: Law of force (F = mass x acceleration)
Law 3: Law of Action & Reaction
The laws followed by the given situations are Newton's law of force, Law of inertia and Newton's third law.
What is meant by inertia ?Inertia is defined as the tendency of an object to continue its state of rest or motion.
Here,
Considering the situations given,
1. Pushing a baby on a swing is easier than pushing an adult on the same swing.
This is because, the mass of the baby is lesser than that of the adult. So, according to Newton's force equation,
Force, F = ma
Therefore to push a body with more mass, more force should be applied.
Another situation that follows this law from the given situations is:
When thrown with the same force, a soccer ball accelerates more than a bowling ball.
2. Water spills from a glass carried by someone who is walking steadily and suddenly stops short.
This is due to the inertia of the water in the glass. This can be explained by law of inertia.
Another situation that follows this law from the given situations is:
A magician pulls a tablecloth out from under a dish on a table without disturbing the dish.
A book rests on top of a shelf and does not move until a student accidentally knocks it off.
3. A rocket launches into space, pushing fuel exhaust in one direction and the rocket in the opposite direction.
This is according to Newton's third law of motion. The law of action and reaction.
Hence,
The laws followed by the given situations are Newton's law of force, Law of inertia and Newton's third law.
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Please help with this!! I need help asap!
NO LINKS!!!
Write as if you are teaching someone about lunar phases!
Write one paragraph about lunar phases, act as if you are teaching a person about these lunar phases.
THANK YOU SOOOO MUCH IF YOU CAN ACTUALLY HELP ME!!
Answer:
so a A lunar phase is an angle of the moon to the earth so it appears differently every day. The moon goes through 8 major phases. A new moon is when the moon cannot be seen because we are looking at the unlit half of the Moon. The new moon phase occurs when the Moon is directly between the Earth and Sun. A solar eclipse can only happen at new moon.
Explanation:
hope this helps
0.0010 kg pellet is fired at a speed of 52.2 m/s at a motionless 3.3 kg piece of balsa wood. When the pellet
hits the wood, it sticks in the wood and they slide off together. With what speed do they slide? Round your
answer to the nearest thousandth.
m/s
The formula for momentum is p = m*v
The conservation of momentum suggests:
m*vi = m*vf (initial mass times initial velocity = final mass times final velocity or initial momentum = final momentum)
(0.0010)(52.2) = (0.0010 + 3.3)vf
vf = (0.0010)(52.2)/(0.0010 + 3.3) = 0.0522/3.301 ≈ 0.01581 m/s
To the nearest thousandth ≈ .016 m/s
A small block with mass 0.0350 kgkg slides in a vertical circle of radius 0.550 mm on the inside of a circular track. During one of the revolutions of the block, when the block is at the bottom of its path, point AA, the magnitude of the normal force exerted on the block by the track has magnitude 3.90 NN . In this same revolution, when the block reaches the top of its path, point BB, the magnitude of the normal force exerted on the block has magnitude 0.670 NN . Part A How much work was done on the block by friction during the motion of the block from point AA to point BB
Answer:
W_net = μ 5.58, μ = 0.1 W_net = 0.558 J
Explanation:
The work is defined by the related
W = F. d = F d cos θ
where bold indicates vectors.
In the case, the work of the friction force on a circular surface is requested.
The expression for the friction force is
fr = μ N
the friction force opposes the movement, therefore the angle is 180º and the cos 180 = -1
W = - fr d
the path traveled half the length of the circle
L = 2 π R
d = L / 2
d = π R
we substitute
W = - μ N d
Total work is initial to
W_neto = - μ π R (N_b - N_a)
let's calculate
W_net = - μ π 0.550 (0.670 - 3.90)
W_net = μ 5.58
for the complete calculation it is necessary to know the friction coefficient, if we assume that μ = 0.1
W_net = 0.1 5.58
W_net = 0.558 J
Un acróbata de masa M, se impulsa hacia arriba con una velocidad v0 desde un
trampolín. Mientras sube, a una altura h sobre el trampolín, recoge a un mono entrenado de masa m. ¿Cuál es la altura máxima que alcanzan el mono y el acróbata?
Answer:
La altura máxima que alcanzan el mono y el acróbata es [tex]z = \frac{1}{2}\cdot \left(\frac{M}{M+m} \right)\cdot v_{o}^{2}+\left(1-\frac{M\cdot g}{M+m} \right)\cdot h[/tex].
Explanation:
Asumamos que tanto el acróbata, el mono y el sistema acróbata-mono son conservativos y que el acróbata comienza su acción a una altura de cero. El estudio se divide en dos etapas: (i) El acróbata se dirige al mono, (ii) El acróbata recoge al mono y alcanzan una altura máxima.
Para resolver esta cuestión, nos valemos del Principio de Conservación de la Energía.
Parte I
La energía cinética traslacional inicial ([tex]K_{1,a}[/tex]) es igual a la suma de la energía cinética traslacional final ([tex]K_{2, a}[/tex]) y la energía potencial gravitacional final ([tex]U_{g,2,a}[/tex]).
[tex]K_{1,a} = K_{2,a} + U_{g,2,a}[/tex] (1)
[tex]\frac{1}{2}\cdot M \cdot v_{o}^{2} = \frac{1}{2}\cdot M\cdot v_{1}^{2} + M\cdot g \cdot h[/tex] (1b)
Donde:
[tex]M[/tex] - Masa del acróbata.
[tex]g[/tex] - Constante gravitacional.
[tex]v_{o}[/tex] - Rapidez inicial del acróbata.
[tex]v_{1}[/tex] - Rapidez del acróbata justo antes de recoger al mono.
[tex]h[/tex] - Altura inicial del mono.
Parte II
La suma de las energías iniciales cinética traslacional ([tex]K_{2, a}[/tex]) y potencial gravitacional de acróbata ([tex]U_{g,2,a}[/tex]) y la energía inicial potencial gravitacional del mono ([tex]U_{g,2,m}[/tex]) es igual a la suma de las energías potenciales gravitacionales iniciales del sistema acróbata-mono ([tex]U_{g,3,a+m}[/tex]), es decir:
[tex]K_{2,a} + U_{g,2,a}+U_{g,2,m} = U_{g,3,a+m}[/tex] (2)
[tex]\frac{1}{2}\cdot M\cdot v_{1}^{2} + (M+m)\cdot g \cdot h = (M+m)\cdot g \cdot z[/tex] (2b)
Donde:
[tex]m[/tex] - Masa del mono.
[tex]z[/tex] - Altura máxima del sistema acróbata-mono.
De (1b) tenemos que la rapidez del acróbata justo antes de recoger al mono es:
[tex]\frac{1}{2}\cdot M \cdot v_{o}^{2} = \frac{1}{2}\cdot M\cdot v_{1}^{2} + M\cdot g \cdot h[/tex]
[tex]v_{o}^{2} = v_{1}^{2}+2\cdot g\cdot h[/tex]
[tex]v_{1} = \sqrt{v_{o}^{2}-2\cdot g\cdot h}[/tex]
Finalmente, la altura máxima alcanzada por el sistema acróbata-mono es:
[tex]\frac{1}{2}\cdot M\cdot v_{1}^{2} + (M+m)\cdot g \cdot h = (M+m)\cdot g \cdot z[/tex]
[tex]z = \frac{M\cdot v_{1}^{2}}{2\cdot (M+m)\cdot g}+h[/tex]
[tex]z = \frac{1}{2}\cdot \left(\frac{M}{M+m} \right)\cdot (v_{o}^{2}-2\cdot g\cdot h)+ h[/tex]
[tex]z = \frac{1}{2}\cdot \left(\frac{M}{M+m} \right)\cdot v_{o}^{2}+\left(1-\frac{M\cdot g}{M+m} \right)\cdot h[/tex]
La altura máxima que alcanzan el mono y el acróbata es [tex]z = \frac{1}{2}\cdot \left(\frac{M}{M+m} \right)\cdot v_{o}^{2}+\left(1-\frac{M\cdot g}{M+m} \right)\cdot h[/tex].
All objects in our solar system orbit the Sun. How is the movement of planets like
Earth around the Sun different than that of comets traveling around the Sun?
PLEASE HELP I WILL GIVE BRAINLIEST JUST PLEASE PLEASE HELP
Answer:
planets move in elliptical orbit.
Explanation:
this is because planets are formed closer to the sun while the comets are formed further.
The Sun is home to 99.85% of all stuff in the Solar System.All objects in our solar system orbit the Sun.The movement of planets is elliptical in nature.
What is solar system?Our solar system consists of the Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, as well as the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
It consists of the planets' satellites, as well as numerous comets, asteroids, and meteoroids, as well as the interplanetary medium. The Sun is home to 99.85% of all stuff in the Solar System.
The movement of planets is elliptical due to the fact that planets are present closer to the sun while the comets are present farther away from the sun as compared to the planets.
Hence the movement of planets is elliptical in nature.
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AWARDING BRAINLIEST \(￣︶￣*\))
A winding mountain road is an example of a(n) ____.
a.
lever
c.
wedge
b.
inclined plane
d.
wheel and axle
Answer:
The answer is B
Explanation:
It's an inclined plane
Function: y = x2 + 5x - 7
Vertex:(
Solutions:(
and
Answer:=7x−7
Explanation:
=2x+5x+−7
=(2x+5x)+(−7)
=7x+−7
Ten examples of artificial luminous objects
paper, pencil, wood, human beings, moon.
Luminous objects are those objects which emit their own light.
Luminous objects can be natural as well as manmade.
One of the examples of natural luminous objects are- torch bulb, stars, sun, lighted candle.
Artificial luminous objects are those which cannot emit their own light.
Some of the examples of the artificial luminous objects are- paper, pencil, wood, human beings, moon.
Fusion produces less radioactivity than fission.
True or false
Answer:
False
Explanation:
Fusion doesn't produce more.
the impact of unemployment in South Africa
Answer: Unemployment has both individual and social consequences that require public policy interventions.
For the individual, unemployment can cause phycology distress which can lead to a decline in life satisfaction it can also lead to mood disorders and substance abuse
CORRECT ANSWER GETS BRAINLIEST!!! (∩^o^)⊃━☆
Each of these simple machines work around a pivot point except the __________.
a.
lever
c.
wedge
b.
pulley
d.
wheel and axle
Answer:
C. Wedge
Explanation:
Answer:
GIVE THE PERSON ABOVE BRAINLIEST UwU
Explanation:
How does a water well affect ground water?
Answer:
Pumping a well lowers the water level around the well to form a cone of depression in the water table. If the cone of depression extends to other nearby wells, the water level in those wells will be lowered. The cone develops in both shallow water-table and deeper confined-aquifer systems.
Explanation:
Help pls it’s time help
Answer:
Imma just add it since i got it right. Well its the first one.
Explanation:
Mine is A temporary magnet is only able to create its own magnetic field while in the presence of a stronger magnet. In other words, these types of magnets need assistance from a larger force in order to be able to attract other objects and magnets.
Answer:
Any time
Explanation:
Using the solubility curvechoose all of the statements that are correct
Explanation:
where are the statements
Which condition is caused by a slightly shortened eyeball?
a) astigmatism
b) nearsightedness
c) farsightedness
Answer:
option C
Explanation:
farsightedness
What variable do you think made this airplane fly the farthest?
Answer:
How does the weight of the nose on a paper
airplane affect the distance it will travel
when measured in centimeters?
EXPERIMENT CONCLUSION: (Explain whether or
not your data supports, or fails to support your identified
prediction. Explain why, including facts and details!)
The distance did increase when I added 1 paper clip.
However, I was surprised that the distance decreased
when I added a second paper clip. I believe this
happened because the nose of the plane became too
heavy. When the plane was released, the nose of the
plane descended much quicker. I think the plane was
more balanced in weight when only 1 clip was on the
nose.
A meteor moving through space speeds up as it gets closer to Earth. What force causes the meteor's speed to increase the closer it gets to Earth?
PLS Help
Answer:
gravity
Explanation:
its hard to explain its one of the resons we do gravity assists for space probes and such the meteor will catch earths gravity and be pulled in by it if you look at sednas orbit as it gets closer to the sun it speeds up.
The force that causes the meteor's speed to increase as it gets closer to Earth is the gravitational force of earth.
What is meant by gravity ?Gravity is defined as the force by which a planet attracts another body towards its center.
Here,
The meteor was moving through space and the speed of the meteor started increasing as it moves closer to the earth.
This is because of the gravitational force of earth that is being exerted on the meteor. Gravitational force of earth is defined as the force of attraction that the earth exerts on another body in its gravitational field and draws them towards the center of the earth.
As the meteor moves towards the earth's , it gets accelerated by the earth's gravitational field such that the speed of the meteor increases and thus it attains more kinetic energy. As a result, the meteor moves faster when it gets closer to earth. This is because of the force of gravity of the earth.
Hence,
The force that causes the meteor's speed to increase as it gets closer to Earth is the gravitational force of earth.
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What is the force required to accelerate an object with a mass of 5 kg and an acceleration of
2 m/s22
During construction, a crane lifts a 2,000-newton weight to the top of a 50-meter-tall building. How much power must the crane have to perform this task in 5 seconds? Use commas where appropriate and round to the nearest tenth.
watts:
kilowatts:
horsepower:
Answer:
Work is defined as force thru a distance: W = F * S
Power is defined as Work per unit time P = W / t
So we an write: P = F * S / t = 2000 N * 50 m / 5 s = 20,000 N-m/s
Since a Joule/sec is equivalent to a Watt
The power required is 20,000 Watts or 20 Kw
Also, you can convert to Hp since 1 Hp = 746 Watts
BRAINLIEST TO THE CORRECT QUESTION
Answer:
the answer is B
visible light
A constant speed is __________ because the distance traveled per unit of the time does not remain the same
Answer:
velocity
Explanation:
velocity is really speed with direction but is what remains constant as the distance changes.
