Answer:
Astronomers use a method similar to the one you used with your homemade quadrant. Twice the distance to the Sun, divided by the distance to the star (which is unknown so far) is equal to the tangent of the parallax angle of the star.
1. How is the attractive electrostatic force between a proton and an electron indicated in Coulomb's law?
the sum of the charges indicates a positive force
the product of the charges indicates a positive force
the product of the charges indicates a negative force
the sum of the charges indicates a negative force
2. One particle has a negative charge, while another particle is neutral. Which statement describes the electrostatic force between these two particles?
There would be no electrostatic force because the sum of the two charges is 0.
The electrostatic force is attractive due to the particle with negative charge.
There would be no electrostatic force because the product of the two charges is 0.
The electrostatic force is repulsive due to the particle with negative charge.
3. How would the electrostatic force change if Coulomb's law included a negative sign?
Like charges would repel, and opposite charges would attract.
It would not make a difference in the electrostatic force.
It would depend on the magnitude of the charges.
Like charges would attract, and opposite charges would repel.
What is the value and the direction of an electric field at a distance of 2.5 m from a +1 nC charge?
approximately 145 V/m directed away from the positive charge
approximately 145 V/m directed toward the positive charge
approximately 1.45 V/m directed away from the positive charge
approximately 1.45 V/m directed toward the positive charge
Answer:
The product of the charges indicates a negative force
There would be no electrostatic force because the product of the two charges wld be zero
Like chargers wld attract, and opposite charges wld repel
Approximately 1.45 V/m directed away from the positive charge
Explanation:
According to Coulomb's law the electrostatic force is directly proportional to the product of the charges and inversely proportional to the distance separating them.
According to Coulomb's law;
F =[tex]Kq1q2/r^2\\[/tex]
Where;
K = constant of Coulomb's law
q1 and q2 are the respective magnitudes of the charges
r = distance separating the charges
Hence,according to Coulomb's law, the product of the charges indicates a negative force.
According to Coulomb's law, for a negative charge, and a neutral particle, there would be no electrostatic force because the product of the two charges is 0. If Coulomb's law included a negative sign then Like charges would attract, and opposite charges would repel.
The electric field is given by the formula;
[tex]E = kq/r^2\\k= 9 * 10^9 Nm^2C-2\\q =1 * 10^-9 C\\r = 2.5 m\\E = 9 * 10^9 Nm^2C-2 * 1 * 10^-9 C/( 2.5 m)^2\\E = 1.45 V/m[/tex]
The direction of the electric field is 1.45 V/m directed away from the positive charge.
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If a 25 kg object is moving at a velocity of 5 m/s, the object has energy
Answer:
Since the KE is proportional to velocity squared, if you increase the KE by a factor of
2
, you increase
v
by a factor of
2
2
=
4
Detailed explanation :
25
=
0.5
⋅
m
⋅
(
5
2
)
Find
m
:
25
=
25
m
2
m
=
2
Hence the new KE:
KE
=
0.5
⋅
2
⋅
10
2
KE
=
100
J
What makes an electric charge?
Answer:
Most electric charge is carried by the electrons and protons within an atom. Conversely, two protons repel each other, as do two electrons. Advertisement. Protons and electrons create electric fields, which exert a force called the Coulomb force, which radiates outward in all directions.
define resistivity ?
what is the range of resistivity for metal and alloys
Answer:
The resistivity of an exceedingly good electrical conductor, such as hard-drawn copper, at 20° C (68° F) is 1.77 × 10-8 ohm-metre, or 1.77 × 10-6 ohm-centimetre. At the other extreme, electrical insulators have resistivities in the range 1012 to 1020 ohm-metres.
A gun kept on a straight horizontal road is used to hit a car travelling on the same road away from the gun at a uniform speed of 14.14 ms -1. The car is at a distance of 150 m from the gun when it is fired at an angle of 45° to the horizontal. What is the distance of the car from the gun when the shell hits it?
Answer:
250 m
Explanation:
In projectile, range is given as;
R = (v²sin 2θ)/g
We are given θ = 45°
Thus range of shell is;
R = (v²sin (2 × 45))/g
R = v²/g
Now, distance for the shell to hit the car will be; 150 + 14.14t
This will be equal to the range of shell;
150 + 14.14t = v²/g
Where t is time of flight
Now, time of flight is given by;
t = (2vsin θ)/g
t = (2v sin 45)/g
In surf form, we have;
t = (2v/(g√2))
Simplifying further gives;
t = (v√2)/g
Plugging this value of t into the distance equation gives;
150 + 14.14(v√2)/g = v²/g
Assuming g is 10 m/s², we have;
150 + 14.14(v√2)/10 = v²/10
Multiply through by 10 to get;
1500 + 14.14(v√2) = v²
v² - 20v - 1500 = 0
From quadratic equation calculator, we have; v = 50 m/s
Thus, t = (50√2)/g
t = (50√2)/10
t = 5√2
Plugging this into the distance equation gives;
Distance = 150 + 14.14(5√2) = 250 m
A coil of wire wrapped around an iron core is rotated in a magnetic field. Electric current begins to flow in the coil.
What type of device is this set-up?
A. a compass
B.an electromagnet
C. a generator
D.a motor
The diagram below shows a 2.0-kilogram block being moved across a frictionless horizontal surface by a 6.0-newton horizontal force.
Answer: 6.0 m/s2
Explanation:
The acceleration of the block pushed horizontally with the force of 6 N is 3 m/s².
What is force?
In order to move a body of mass 'm' kg with an acceleration of 'a' m/s², a force of magnitude → |F| = ma is needed to push the body in a specified direction.
Given is a 2 kg block being moved across a frictionless horizontal surface by a 6 Newton horizontal force.
Mass of block [m] = 2 Kg
Force on block [F] = 6 N
From the definition of force -
|F| = ma
6 = 2 x a
6 = 2a
a = 3 m/s²
Therefore, the acceleration of the block pushed horizontally with the force of 6 N is 3 m/s².
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Think about multiplying the mass of each student by a factor to calculate each student’s kinetic energy. Is there a common factor that works for every student? If so, what’s this factor?
Answer:
KE= (1/2)mv^2
given m, the remaining components of the equation are=
1/2v^2?
Explanation:
KE= (1/2)mv^2
plug in...
=(1/2)(27 kg)(3 m/s)^2= 121.5
KE= 121.5 J
Answer:
Multiplying the mass of any student by a factor of 4.5 gives the kinetic energy of the student.
A baseball is hit into the air with a velocity of 27 m/s. How high does it go?
Answer:
Explanation:
If a baseball is hit into the air with a velocity of 27 m/s, we want to determine the maximum height of the ball. Using the projecile formula;
Max height H = u²/2g
u is the initial velocity of the body = 27m/s
g is the acceleration due to gravity = 9.81m/s²
H = 27²/2(9.81)
H = 729/19.62
H = 37.16m
Hence the ball went 37.16m high
where are some places that cyber bullying occurs? Check all that apply
A in classrooms
B in text messages
C on playgrounds
D on websites
E on social media networks
F in chat rooms.
help im being timed 01:51:15
Answer:
B, E, F
Explanation:
Because cyberbullying happens online, text messages, social media networks, and chat rooms can all have cyberbullying, because they are all ways to chat online. D does not apply, because on most websites there are not ways to chat.
Answer:
B D E AND F
Explanation:
Which of the following statements about valence electrons is false?
•Valence electrons are exposed to the nucleus of other atoms
•Valence electrons are the outermost electrons only
•Valence electrons are the only factor that determines the type and number of bonds that can form
•Valence electrons are the ONLY electrons that can form chemical bonds
Please answer ASAP!!
Answer:
valence electron are exposed to nucleus of other atom,
Two positively charged particles are 0.03 m apart. The first particle has a
charge of 8.1 C, and the second a charge of 2.6 C. Which change would
increase the electric force between the two particles?
Answer:1.3 103 N
Explanation:hope this helps.
Increasing the charge on each particle by 2.0C would increase the electric force between the two particles. Therefore, option (B) is correct.
What is coulomb's law?According to Coulomb’s law, the force between two charged point charges is the product of the magnitude of their charges and is inversely proportional to the square of the distance between the point charges. This force usually acts along the line which is joining the two charges.
The magnitude of the electric force can be expressed mathematically:
[tex]F = k\frac{q_1q_2}{r^2}[/tex]
where k is constant and has a value of 8.99 × 10⁹ N.m²/C².
We have given the two-point charges 8.1 C and 2.6 C. The distance between them is equal to 0.03 m. From the above-written formula, we can say that the charge on the particles is directly proportional to the electric force, and the distance between the charged particles is inversely proportional to the electric force.
Therefore, increasing the charge on each particle by 2.0 C would increase the electric force between the two particles.
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5. An ion consist of 12 electrons and 11 proton. What is the charge
on the ion?
Answer:
-1
Explanation:
Electrons have a negative charge and protons have a positive charge. (+11) + (-12) = -1
Vector L is 303 m long in a
205º direction. Vector M is
555 m long in a 105° direction.
Find the magnitude of their
vector sum
Answer:
584.32m
Explanation:
Firstly, we need to find the x and y components of each vector.
x-component for vector L=303cos205°=-274.61
y-component for vector L=303sin205°=-128.05
x-component for vector M=555cos105°=-143.64
y-component for vector M=555sin105°=536.09
Since it's the vector sum, we add the x and y components of each vector.
Resultant vector x-component -274.61+(-143.64)=-418.25
Resultant vector y-component -128.05+536.09=408.04
Now, to find the magnitude, we use the formula [tex]\sqrt{x^{2}+y^{2}}[/tex]
sqrt(-418.25^2+408.04^2)=584.32m
Check my work for errors just in case.
what is the kinetic energy of a 200kg boulder that has fallen 500m off a 1000m cliff ?
Answer:
Ek = 981000 [J]
Explanation:
To solve this problem we must use the principle of energy conservation, where kinetic energy is transformed into potential energy or vice versa. In this special case we take the reference level of potential energy in the soil (potential energy equivalent to zero). When the potential energy is zero, this energy has been transformed into kinetic energy and the velocity will be maximum.
[tex]E_{k} =\frac{1}{2}*m*v^{2}[/tex]
[tex]E_{p}=m*g*h[/tex]
where:
Ek = kinetic energy [J]
Ep = potential energy [J]
m = mass = 200 [kg]
h = elevation = 500 [m]
[tex]E_{p}= E_{k}[/tex] (energy conservation)
Ep = 200*9.81*500
Ep = 981000 [J]
And the kinetic energy is equal to:
Ek = Ep = 981000 [J]
Explain one way in which friction actually helps people
Answer:
Friction creates warmth
What type of landform is depicted here? a. a mountain b. a depression c. a valley
Answer:
b.mountain the correct answer
Explanation:
what type of ladform ids depicted here? a.a b. mountain b. a depression c. avaley
A swimmer sets off headed west at 0.40 m/s directly towards the opposite shore of a swift river. The swimmer makes it to the opposite shore 30 meters downstream of their expected position. If the river is 7.5 meters wide, what is the velocity of the water relative to the shore?
Answer:
Explanation:
River is 7.5 m wide . Time taken by it cover this displacement
= displacement / velocity
= 7.5 / 0.4
= 18.75 s
During this period , swimmer will have a displacement of 30 m due to velocity of river water .
Displacement of 30 m downstream will be due to flow of river .
velocity of water flow = displacement / time
= 30 / 18.75
= 1.6 m /s
How far from the nucleus in angstroms (1 Å = 10-10 m) is the electron in a hydrogen atom if it has an energy of -8.72 * 10-20 J?
Answer:
1200
Explanation:
Need help on these 2 question ??hurry anyone please
Answer:
I know you may not be reading this but for number 13 the answer is 2 hours because t=d/s which is 4000/2000 which equals to 2.
Explanation:I've currently doing that problem as of the time i'm writing this.
Enzymes have a certain temperature at which they work best. Temperatures above and
below this point will decrease enzyme activity. Which graph best illustrates the effect of
temperature on enzyme activity?
Answer:
B
Explanation:
It shows the increase in temperature and the decrease.
The best activity of enzyme is It increases and decreases.
What are Enzymes?A biological catalyst called an enzyme is usually always a protein. It accelerates a certain chemical reaction in the cell.
The enzyme is continuously employed during the reaction and is not destroyed. Each enzyme molecule found in a cell is unique and tailored to a particular chemical reaction.
A biological catalyst called an enzyme is often a protein, though it can also be RNA. A catalyst's purpose is to quicken the rate at which a reaction takes place.
Therefore, The best activity of enzyme is It increases and decreases.
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A student releases a marble from the top of a ramp. The marble increases speed while on the ramp then continues across the floor. The marble travels a total of 120cm in 3.40s.
What is the final velocity (in cm/s)
Answer:
35.2941176 cm/s
Explanation:
round it if you need too
Distance divided by time.
A car starts at rest and accelerates at a constant rate for 12 seconds to speed of 30 m/s. What is the total distance traveled in these 12 seconds
Answer:
360 meters
Explanation:
1. Set up a formula. Distance = Speed x Time
2. Plug in given information. d (distance) = 30m/s * 12s
3. Multiply numbers AND units. d = 360m
4. Check that units & numbers make sense.
Speed is a measure of how quickly an object moves.
The speed equation can be rearranged to calculate the distance traveled and the time required.
The total distance traveled in these 12 seconds = 360 m.
What is speed ?Speed is a measure of how quickly an object moves. Use the speed equation to calculate speed: speed = distance divided by time. The speed equation can be rearranged to calculate the distance traveled and the time required.Speed is the rate at which an object moves along a path in time, whereas velocity is the rate and direction of movement. In other words, velocity is a vector, whereas speed is a scalar value.The force of impact increases with the square of the increase in speed, according to physical laws. So, doubling the speed of a car increases the force of impact fourfold.The total distance traveled in these 12 seconds = 30 m/s x12 sec
=360 m.
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how are open and closed systems related to energy?
Answer:
The stovetop system is open because heat can be lost into the air. A closed system is one that cannot transfer energy to its surroundings.
what is the answer? I need help.
Answer:
moving water
Explanation:
its called hydropower its a form of renewable energy that uses moving water
A snowball starting at rest rolls down a hill and reaches 5 m/s. If the hill is
40m long, what is the ball's acceleration? Include only the number when
you put your answer.
Answer:
The acceleration of the snowball is 0.3125
Explanation:
The initial speed of the snowball up the hill, u = 0
The speed the snowball reaches, v = 5 m/s
The length of the hill, s = 40 m
The equation of motion of the snowball given the above parameters is therefore;
v² = u² + 2·a·s
Where;
a = The acceleration of the snowball
Plugging in the values, we have;
5² = 0² + 2 × a × 40
∴ 2 × 40 × a = 5² = 25
80 × a = 25
a = 25/80 = 5/16
a = The acceleration of the snowball = 5/16 m/s².
The acceleration of the snowball = 5/16 m/s² = 0.3125 m/s² .
How is mercury obtained and separated from other nearby substances?
A gas that is heated under constant pressure...
A.) will contract and demonstrate Boyle's Law
B.) will contract and demonstrate Charles's Law
C.) will expand and demonstrates Charles's Law
D.) will expand and demonstrates Boyle's Law
Answer:
c: will expand and demonstrate the Charles's law
sonia has three different sized blocks of copper . she made observations and mesaurements of each block. which of her measurements would be different ?
Answer:
This question lacks options, the options are:
A.The density of each block.
B.The electrical conductivity of each block.
C.The melting point of each block.
D.The volume of each block
The answer is D. Volume of each block
Explanation:
According to this question, Sonia has three blocks of different sizes. She then made observations and measurements of each block. The physical property of a substance that depends on the size of that substance is called EXTENSIVE PROPERTIES. This include mass, height, volume, length etc.
In this case, the different measurement Sonia will record on each copper block will be the VOLUME OF EACH BLOCK. This is because the volume depends on the size of the block (extensive), hence, will have different volume measurements.
Explain what the core muscles do and why it's important to have a strong set of core muscles.
Answer:
Since your spine runs by your core, having a strong core will help protect and stabilize your spine, and you're also are able to control movements such as walking or standing better with a strong core.
