Answer:
valence electron are exposed to nucleus of other atom,
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.
________are muscles connected to the skeleton.
1.) Smooth muscles
2.) Skeletal muscles
3.) Strong muscles
4.) Cardiac muscles
Answer: Skeletal Muscles
Explanation:
Skeletal muscles are attached to the skeleton by tough connective tissues called tendons
What are some examples of an element? How do you know they are an element?
HELP PLZ ITS DUE SOON
Giwe two Escample of translucent
Object
Answer: Butter paper, ground glass, and a bonus thin sheets of plastic
Explanation: Translucent objects allow light to pass through them partially.
Answer:
Tinted windows, frosted glass, sunglasses, wax paper, fingers, and certain plastics are all examples of translucent objects. Translucent is defined as a material that blurs light as it passes through.
Hope this helps :)
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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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]
A softball is thrown perfectly vertically (straight-up) at 18 m/s.
a) How high will it go?
b) Find the total time the ball is in the air.
Answer:
a) y = 16.51 [m]
b) t = 1.83 [s]
Explanation:
To solve this problem we must use two kinematics equations, the first to determine the height to which the ball reaches, and the second equation to determine how long it lasts in the air.
[tex]v_{f} ^{2}= v_{i} ^{2} - (2*g*t)\\[/tex]
where:
Vf = final velocity = 0
Vi = initial velocity = 18 [m/s]
g = gravity acceleration = 9.81[m/s^2]
t = time [s]
Note: the negative sign of the Equation indicates that the acceleration of gravity acts in the opposite direction to the movement of the ball. The final velocity is zero, since the ball reaches its maximum altitude when the velocity is zero.
Now replacing:
0 = (18)^2 - (2*9.81*y)
y = 16.51 [m]
b)
[tex]v_{f} = v_{i} - (g*t)[/tex]
0 = 18 - (9.81*t)
t = 1.83 [s]
Which graph shows the change in velocity of an object in free fall?
Answer:
C!
Explanation:
I just did the test !
Please stay safe and wear a mask , we are in the mist of a pandemic ! !
The graph shows the change in velocity of an object in free fall is according to option C.
What is free falling?When an object is released from rest in free air considering no friction, the motion is depend only on the acceleration due to gravity, g.
When an object is made to fall freely, it's velocity is only depended on the acceleration due to gravity, g. The velocity decreases till it become zero.
Thus, the correct option is C.
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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.
How is mercury obtained and separated from other nearby substances?
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.
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:
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
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 speed of an object changes only when it is acted on by an unbalanced force.
Answer:
If an object has a net force acting on it, it will accelerate. The object will speed up, slow down or change direction. An unbalanced force (net force) acting on an object changes its speed and/or direction of motion. An unbalanced force is an unopposed force that causes a change in motion.
Explanation:
I hope this helps you out and if your feeling generous plz mark brainliest it helps me a lot thank you:)
A parachute on a racing dragster opens and changes the speed of the car from 79.33 m/sec to 41.55 m/sec in a period of 5.21 seconds. What is the acceleration of the dragster?
Answer:
c: -7.25
Explanation:
Here we can use the equation v=u+at
Where v is the final velocity
u is the initial velocity
a is acceleration
and t is time
41.55=79.33+a(5.21)
41.55-79.33=5.21a
-37.78=5.21a
a=-7.25 m/[tex]s^2[/tex]
The negative sign is due to the fact that they are slowing down
Help asap please. How would I do this?
Answer:
what to answer I don't know sorry
mark as branliest
Aang and Appa are flying over Ba Sing Se. They covered 500 m in 30 seconds while heading east. What was their velocity?
Answer:
Explanation:
I need help to marysol;)
A stone is projected vertically upwards with a velocity of 30m/s from a tower of height 50m negleting air resistance,determine the maximun height it reached from the ground (g=10ms^-1)
An apple suddenly drops a distance of 3.2 m from a tree. If the acceleration due to gravity is 9.8 m/s2, how long does it take the apple to reach the ground?. Give your answer to two decimal places.
Answer:
0.33 seconds
Explanation:
The time taken by the apple to reach the ground will be 0.8 seconds.
What is velocity?The velocity of an object is the ratio of its travel distance over a given amount of time. The magnitude and direction are both necessary for the velocity because it is a vector quantity.
Given that an apple suddenly drops a distance of 3.2 m from a tree. If the acceleration due to gravity is 9.8 m/s². The time taken by the apple to reach the ground will be calculated by the formula below:-
Time = √ ( 2s)/g)
Time = √ ( 2 x 3.2 )/9.8)
Time = 0.8 second
As a result, it will take the apple 0.8 seconds to reach the ground.
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is it possible for a tennis ball to have more momentum than a cannonball? explain
A 20,000 kg jet plane is accelerating at 2 m/s2. How much force does it put forth?
Answer:
40,000N of force
Explanation:
The formula for force is F=ma. If we plug in the values, F=(20,000kg)(2m/s^2).
A ball is thrown vertically upwards from a point on the ground. It was observed at a height h twice with a time interval Δt. The initial velocity of the ball is?
4
The accompanying graph represents the motion of an object.
Displacement
Time
According to the graph, as time increases, the velocity of the object
A. decreases
B.
increases
C remains the same
Answer: It remains the same
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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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.
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
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
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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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.
