Answer:
hai điện tích điểm bằng nhau có độ lớn 6.10^-8C đặt cách nhau một khoảng là r trong dầu hỏa có hằng số điện môi E=2,1. Lực tương tác tĩnh điện giữa chúng laf3,85.10^-4. tìm r
Lillle is running. She increases her initial speed of 30 km/h to 40 km/h so she
can win the race. If she takes 0.05 hours to complete this increase, what is
her acceleration?
[tex]\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{40-30}{0.05}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{10}{0.05}[/tex]
[tex]\\ \sf\longmapsto Acceleration=200km/h^2[/tex]
Answer
[tex]200km {h}^{ - 2} [/tex]
Explanation
[tex]Acceleration = \frac{final \: \: \: velocity - initial \: \: velocity }{time} \\ = \frac{(40 - 30)km {h}^{ - 1} }{0.05h} \\ = \frac{10}{0.05} \\ = 200km {h}^{ - 2} [/tex]
Hope this helps you.
Let me know if you have any other questions :-):-)
a man weighing 989n on earth only 163 N on the moon. His mass on the moon is __ kg. (Use g=9.8m/s)
Answer:
16.63265306 Kg
Explanation:
This is a Newtons to weight conversion.
Fg = weight
Fg = N/9.8
The angular resolution of a ground-based telescope is usually determined by:
For telescopes in general, ever since they were invented, it's the size of the objective lens (in the front) or mirror (in the back).
For the most hugest humongous telescopes, built in the past few decades, it's limited by the turbulence of the atmosphere. That's the main reason we started building the big ones on mountain tops and in deserts, and lately we've started putting them in Earth orbit, where they don't have to look through any air at all.
"An object at rest starts accelerating. If it is going 120 m/s after traveling 202 meters, how quickly did it speed up?"
Answer:
this is just a guess bc i only looked at it for 5 seconds but i think 150 m/s
what type of telescope can be used routinely on the surface of the earth during the day?
Answer:
Radio telescopes .
Explanation:
They have a modest size that can't make out as much detail (have a lower resolution) than visible light telescopes
Esther dives off a 3m springboard and initially bounces up with a velocity of 8.0 m/s at an angle of 80.0 to the horizontal.. what are the horizontal and vertical components of her velocity
This question involves the concept of the resolution of a vector into its rectangular components.
The horizontal component of velocity is "1.4 m/s", and the vertical component of the velocity is "7.9 m/s".
In order to find the horizontal and vertical components of the velocity of Esther, we must resolve the velocity vector into its rectangular components. Hence, the following formulae will be used:
[tex]Horizontal\ Component = v_x = v\ Cos\theta\\v_x = (8\ m/s)(Cos\ 80^o)\\v_x = 1.4\ m/s[/tex]
[tex]Vertical\ Component = v_y = v\ Sin\theta\\v_y = (8\ m/s)(Sin\ 80^o)\\v_y = 7.9\ m/s[/tex]
Learn more about the resolution of a vector here:
https://brainly.com/question/11234810?referrer=searchResults
The attached picture shows the resolution of a vector.
What is E equal to in relativity?
[tex] \huge \underline \mathtt \colorbox{cyan}{E=mc squared}[/tex]
(E=mc^2)
Where:m is mass
And c is a constant for speed of light
Answer:
One of the most famous and well-known equations in all of human history, E = mc^2, translates to "energy is equal to mass times the speed of light squared." In other words, wrote PBS Nova, energy (E) and mass (m) are interchangeable. They are, in fact, just different forms of the same thing.
Explanation:
this is right answer
By moving her arms outward, an ice skater speeds up a spin, while moving her arms inward slows down a spin. Question options: True False
false
ITS TURE.When there is no torque acting on a body, its angular momentum is constant. Net force changes momentum, while net torque changes angular momentum.
Answer: false
Explanation:
Help quickly…
As a person travels due east, the altitude of the North Star
(1) decreases
(2) increases
(3) remains the same
East or west: it remains the same.
North: it increases.
South: it decreases.
At the North pole: it's straight up over your head.
At the equator: it's on the horizon, north of you.
South of the equator: it's below the horizon and you can't see it at all.
Match the labels to the correct
location on the roller coaster.
At the bottom left,
Increasing potential energy.
At ascending,
Increasing kinetic energy.
At the peak,
Greatest potential energy.
At the descending,
Greatest kinetic energy.
A 925 kg car accelerates uniformly from rest to a velocity of 25.0 m/s in 10.0s. What is the net force on the car?
Answer:
A 925 kg car accelerates uniformly from rest to a velocity of 25.0 mls south in 10.0 s. What is the net force acting on the car during this time?
F=(925*25)/10
F=2312.5 N to south
Hi there!
We can begin by calculating the acceleration experienced by the car.
vf = vi + at
The initial velocity is 0 (at rest), so:
25 = at
25/10 = a = 2.5 m/s²
Using Newton's Second Law:
∑F = ma, where:
∑F = net force (N)
m = mass (kg)
a = acceleration (m/s²)
Plug in the values:
∑F = 925 · 2.5 = 2312.5 N
Two cars are traveling eastward on a highway, as shown in the left figure below. After 5.0 sec, the cars are side by side at the next telephone pole, as shown on the right. The distance between each of the poles is 70.0 m. Determine the following quantities:
a) The distance the van has traveled during 5.0s interval
b) the distance limousine has traveled during the 5.0s interval.
c)The average velocity of the van during this 5.0s interval
d)the average velocity of the limousine during this 5.0s interval.
mass is conserved in a reaction if the of the initial reactant masses equals the of the masses of
Answer:
mass of the products
Explanation:
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
I NEED HELP ASAP! BRAINIEST TO THE CORRECT ANSWER. HELP ME NOW!
A 12v Light bulb uses 24v of power.
a) Calculate its resistance and the current at full power.
b) Calculate the resistance of a 100w mains light bulb and the current at full power.
c) Two bulbs are connected in series and supplied from the mains power at 230v. Calculate the current in the circuit. Assume that both bulbs operate at their working resistance.
d) Use your answer to part c) to comment on the brightness of the bulbs.
Answer:
a)[tex]\boxed{\mathfrak{Power(P)=\frac{Voltage(V)^2}{Resistance(R)} }}[/tex]
V = 12 VP = 24 W[tex]\implies \mathsf{24=\frac{12^2}{R} }[/tex]
[tex]\implies \mathsf{24R=12^2 }[/tex]
[tex]\implies \mathsf{24R=144 }[/tex]
=> R= 6 Ohms(Ω)
b)[tex]\boxed{\mathfrak{Power(P)=\frac{Voltage(V)^2}{Resistance(R)} }}[/tex]
Power (P)= 100 Wthese lights operate at the usual 240 volts direct from the main electricity supply. Therefore,
V = 240 V[tex]\implies \mathsf{100=\frac{240^2}{R} }[/tex]
R and 100 can interchange places
[tex]\implies \mathsf{R=\frac{240^2}{100} }[/tex]
[tex]\implies \mathsf{R=\frac{57600}{100} }[/tex]
=> R = 576 Ω
By Ohm's Law:
[tex]\boxed{\mathsf{Voltage(V)=Current(I) \times Resistance(R)}}[/tex]
=> 240 = I × 576
=>
=> I = 0.417 A
c)I don't know it's resistance,... so sorry
d)The brightness of the bulb in series is less than when they're placed individually.
For bulbs in series their resistance gets added to form the equivalent resistance of the two bulbs.
Their resistances are nothing but mere numbers and the sum of two numbers(positive of course) is greater than the numbers.
So, the effective resistance of some bulbs in series is more than the individual resistance.
And
Brightness, i. e., Power
[tex]\boxed{\mathfrak{Power \propto \frac{1}{Resistance} }}[/tex]
If resistance increases, Power decreases.
Here, the effective resistance was for sure larger, therefore resistance was increasing, hence power decreased taking brightness along with it.
Why are the four largest moons of Jupiter called Galileans
Answer:
because it's discovered by Galileo Galilei
Answer:
Hello how are you ^0^
Explanation:
because it's discovered by Galileo Galilei
hope it's help you (^0^)
The ______ describes the height or the wave measured from the central axis
Answer:
Amplitude
Explanation:
Answer:
the wave trough.
Explanation:
As is shown on the figure, wave height is defined as the height of the wave from the wave top, called the wave crest to the bottom of the wave, called the wave trough. The wave length is defined as the horizontal distance between two successive crests or troughs.
The brain is not a muscle, like the heart, that can be worked and built. Which BEST explains why a consistent exercise regime has a positive
impact on the brain?
ОА. .
Exercise generally requires a lot of thinking.
ОВ.
Exercise can eliminate all of the impact of stress.
OC.
Exercise helps maintain and create pathways in the brain.
OD.
Exercise is the only way to moderate the hormones that control the brain.
Regular exercise has a positive impact on the brain, and the best explanation for this is that exercise helps maintain and create pathways in the brain (Option C).
1. The brain is a complex organ composed of billions of nerve cells called neurons. These neurons communicate with each other through pathways, forming a vast network.
2. When we engage in physical exercise, it increases blood flow to the brain. This enhanced blood flow delivers more oxygen and nutrients to the brain cells, promoting their overall health and functioning.
3. Exercise also stimulates the release of various chemicals in the brain, such as neurotransmitters and growth factors. These substances play a crucial role in the growth, development, and maintenance of brain cells.
4. Additionally, regular exercise has been found to promote the formation of new connections between neurons, a process known as neuroplasticity. These connections, also called synapses, are essential for learning, memory, and overall cognitive function.
5. By engaging in consistent exercise, individuals can enhance neuroplasticity, allowing their brains to adapt and reorganize in response to new experiences and challenges.
6. Moreover, exercise has been shown to reduce the risk of age-related cognitive decline and neurodegenerative diseases, such as Alzheimer's disease. It may also help improve mood, reduce stress, and enhance mental well-being.
7. In summary, while the brain is not a muscle that can be directly exercised, regular physical exercise positively impacts the brain by promoting neuroplasticity, improving blood flow, releasing beneficial chemicals, and reducing the risk of cognitive decline.
Therefore, the best explanation for why a consistent exercise regime has a positive impact on the brain is that exercise helps maintain and create pathways in the brain (Option C).
For more such questions on brain, click on:
https://brainly.com/question/19260219
#SPJ8
I need this asap pls I will mark brainliest!
Answer:
13.73 degrees farenheit
-10.15 degrees Celsius
Explanation:
hope this helps
Peter’s teacher tells him that he should not place his electric stereo near the edge of a pool because the water in the pool is a conductor. What does she mean when she says that the water is a conductor?
a
Water is a type of electrical energy.
b
Water damages electric circuits.
c
Electric charges cannot flow without water.
d
Electric charges move through the water in the pool.
Answer:
D- Electric charges move through the water in the pool.
Explanation:
I got it right on my test
Can someone help me with this? (Also C is incorrect)
Answer:
i think its d
Explanation:
density is 1.3kg/m3 volume=? mass=? 80m 40m 15m
From the given information, it's not possible to find the mass or the volume of the sample.
Density is their RATIO, but you can't tell if the sample is the size of an ant or a school-bus.
which is an action/reaction force pair? check all that apply.
Answer:
According to Newton's third law, for every action force there is an equal (in size) and opposite (in direction) reaction force. Together, these two forces exerted upon two different objects form the action-reaction force pair.
Explanation:
Sana makatulong ^_^
true or false
your weight would be the same on the moon as it is on the earth
Answer:
False
Explanation:
You could weigh less on the moon then on Earth because the moon has a smaller gravitational force compared to Earth.
How does the mass of an object affect its acceleration?
Answer:
the mass + the 1 constant g-force = the speed without adding air resistance
Explanation:
osmium it the most tightly packed alloy in the world so for that it will have a faster acceleration
why planets do not twinkle
Answer:
Explanation:
Basically because they are big and relatively near.
The light coming from a star travels a huge distance and is acted upon by the earth's atmosphere with causes all sorts of shifts. What we are seeing twinkle is caused by these shifts, for the most part caused by atmospheric density and heat.
The beam from a planet is not narrow enough to be affected the way the stars are.. If you were out in space looking at all this, the stars would not appear to twinkle either.
A 50 kg rocket generates 990 N of thrust. What will be its acceleration if it is launched straight up?
Answer:
[tex]{ \rm{acceleration = \frac{force}{mass} }} \\ \\ { \rm{a = \frac{990}{50} }} \\ \\ { \boxed{ \rm{ \: a = 19.8 \: m {s}^{ - 2} }}}[/tex]
Look at the Sankey diagram for a filament light bulb below. If the bulb is used in a desk lamp, what is the efficiency of the bulb?
Answer:
The question does not state how the answer is to be entered. I would use 10% because that is most common.
Explanation:
You are using 300 J of energy to get 30 J of light energy. The fact that you can account for the left over energy is not relevant.
Efficiency = Work Out / Work In
Efficiency = 30 J / 300 J = 0.1
If you need this as a %, you can multiply by 100
Efficiency = 0.1 * 100 = 10%
Q1: You place two charges a distance r apart. Then you double each charge and double
the distance between the charges. How does the force between the two charges
change?
a) The new force is twice as large.
b) The new force is half as large.
c) The new force is four times as large.
d) The new force is four times smaller.
e) The new force is the same.
(HELP HELP)
Answer:
F1 = K Q Q / R^2
F2 = K 2Q * 2Q / (2 R)^2 = K 4 Q^2 / (4 R^2) = K Q^2 / R^2
F1 = F2 and (e) is the correct answer
The force between the two charges will be the same, so the new force is the same. Hence, option (e) is correct.
What is Electrical energy?
When put in an electromagnetic field, charged matter experiences a force due to the fundamental property of electric charge. Positive or negative electrical ions are possible. When two charges are in opposition to one another, they repel one another.
The term "neutral" refers to an object that has no net charge. The early understanding of the way charged particles interact is now referred to as classical electrodynamics, and it is still true for issues that do not demand taking into account quant phenomena.
As per the given data provided in the question,
F(1) = K (Q)(Q) / R²
After applying the given condition in the question,
F(2) = K (2Q) × (2Q) / (2 R)²
= K 4 Q² / (4 R²)
F(2) = K Q²/ R²
Which means that F1 = F2.
Therefore, it concludes that option (e) is correct.
To know more about Electric energy:
https://brainly.com/question/863273
#SPJ2
8.) You push on a box with 100N of force. The box has a mass of 15 kg. What is
the acceleration of the box?
Answer:
he pushed 192,753,636,363
Explanation:
Give one example of an object that is accelerating
Answer:
The only answer that i could think of:
A falling body
Answer:
a sky diver that just jumped out of a plane
or a car that just had the light turn green
or an apple droped from a tree
or a sled sliding down a hill
Explanation:
all of these objects would be acclerating
the skydiver and apple would be acclerating from 0 at a rate of 9.8m/s^2
Hope this helps! :)