Answer: F = 5.76x10^-1 N
Explanation:
The force between two charges is:
F = k*q1*q2/r^2
where k = 9x10^9 N*m^2/C^2 is the Coulomb's constant.
q1 and q2 = 6x10^-6 C
and r is the distance between the charges, here r = 0.75m
then the force is:
F = ( 9x10^9 N*m^2/C^2)*6x10^-6 C*6x10^-6 C/(0.75m)^2 = 576x10^-3 N
F = 5.76x10^-1 N
We have a positive force, this means that we have a repulsive force.
A boy of 65 kg is skating around a circle with radius 3.8
meters. If he is moving at 4.25 m/s, what is his angular
momentum? (Round to the nearest hundredth).
A 1049.75 Nms
B 27.63 Nms
C 276.25 Nms
D 10.50 Nms
E 104.98 Nms
Answer:
A 1049.75
Explanation:
notice that a Nms is equal to a kg(m^2)/s which is what you get if multiply all three given values.
the formula is angular momentum = (mass)(velo)(radius)
therefore
65(3.8)(4.25) = the answer
= 1049.75
Describe the relationship between the direction of the velocity vector and the direction of the acceleration for a body moving in a circle at constant speed.
Anand gets into an elevator and travels 50 m straight up in a time of 5 s. He then travels in the opposite direction, straight down, for 70 m in a time of 6 s. What is his average speed and velocity, respectively, over the 11 s period?
A. 10.9 m/s, 1.82 m/s
B. 10.9 m/s, −1.82 m/s
C. 21.8 m/s, 10.9 m/s
D. −10.9 m/s, 5.2 m/s
Answer:
10.9 m/s, −1.82 m/s
Explanation:
We have,
Anand gets into an elevator and travels 50 m straight up in a time of 5 s. He then travels in the opposite direction, straight down, for 70 m in a time of 6 s.
Total time of journey is 11 seconds.
Total distance is 50 m + 70 m = 120 m
Total displacement is 50 m - 70 m = -20 m
Average speed, [tex]s=\dfrac{120\ m}{11\ s}=10.9\ m/s[/tex]
Average velocity, [tex]v=\dfrac{-20\ m}{11\ s}=-1.82 \ m/s[/tex]
So, the correct option is (b) 10.9 m/s, −1.82 m/s.
A car veers off course and runs straight into a brick wall. This is an example
of which of the following?
A. long time, large force
B. long time, small force
C. short time, small force
D. short time, large force
Answer:
Short time large force
Answer fast, please.
When the motion energy of an object changes, there is inevitably some other change in energy at the same time. If an object is slowing down, where is the energy going? (Check all that apply)
Question 9 options:
The potential energy could be increasing, like a ball thrown into the air.
The kinetic energy could be lost to friction or air resistance.
The ball could be returning to its natural resting state.
Due to the conservation of energy, the kinetic energy must stay the same.
Explanation:
This problem bothers on the conservation of mechanical energyThis is the principles in which the energy changes by virtue of the position of the body and when in motion are conserved.
The principle of conservation of mechanical energy states that "energy can neither be created nor destroyed but can be transformed from one form to another".
Based on the principle of energy conservation the correct options are
The potential energy could be increasing, like a ball thrown into the air.The kinetic energy could be lost to friction or air resistance.The ball could be returning to its natural resting state.What happens to inertia as you increase the mass?
What needs to be the relation between the two forces to cause the upper magnet to float without moving?
Answer:
If it points the other way, the fields subtract, for a lower energy, and so the magnet prefers to turn to point in this way. Magnets in uniform fields feel torques which make them turn around if they are not pointing in the right direction, but there is no net force making the magnet want to levitate.
Explanation:
Which factors affect the speed of ocean waves?
Answer:
The speed of all ocean waves is controlled by gravity, wavelength, and water depth. Most characteristics of ocean waves depend on the relationship between their wavelength and water depth. Wavelength determines the size of the orbits of water molecules within a wave, but water depth determines the shape of the orbits
Explanation:
PLEASE GIVE ME BRAINLIEST
A new pest is found that only feeds on corn plant leaves. Which promoter would you choose if the modified gene produces toxins that are not safe for livestock to ingest?
1072AQ3
A. Promoter 1.
B. Promoter 2.
C. Promoter 3.
D. Promoter 4.
It is actually B. Promoter 2.
Your welcome
Say safe
Cabbage juice can be used as a pH indicator. Using the above chart, choose all of the statements that are correct
Answer:
Google it muh homie
Explanation:
Explanation:
lemon juice is a strong acid and would turn cabbage juice red
a sample rainwater turns the cabbage juice violet indicating it is slightly acidic
Write the formula for kinetic energy that uses force in its equation. Calculate the kinetic energy generated when a 2500 N force is applied to a car when moving it 200 m. Show work.
Answer:
500000 J
Explanation:
ΔKE =Work = F*d = 2500 N * 200 m =500000 J
A hockey puck moving at 28 m/s is caught by an 80,00 kg man who was at
rest. The man and puck move together after the collision. The pucks mass is
0.16 kg. What is the final velocity?
A. 0.06 m/s
B. 4.5 m/s
C. 1.36 m/s
D. 8 m/s
Answer:
A
Explanation:
all the work is in the attached file :D
A concave mirror forms a real image at 15.0 cm from the mirror surface along the principal axis. If the corresponding object is at a distance of 30.0 cm, what is the mirror's focal length? Please show your work
Answer:
Focal length, f = 10 cm
Explanation:
We have,
A concave mirror forms a real image at 15.0 cm from the mirror surface along the principal axis, it means that the image distance is 15 cm
The object is placed at a distance of 30 cm, u = -30 cm
It is required to find the focal length of the mirror. Let it is f. Using mirror's formula to find it:
[tex]\dfrac{1}{v}-\dfrac{1}{u}=\dfrac{1}{f}\\\\\dfrac{1}{15}-\dfrac{1}{(-30)}=\dfrac{1}{f}\\\\f=10\ cm[/tex]
So, the focal length of the mirror is 10 cm.
When tectonic plates are strained to the point that they can no longer bend, which of the following is most likely to occur?
A. Earthquake
B. Volcanic Eruption
C. Convection Current
D. Ocean Basin Formation
When tectonic plates are strained to the point that they can no longer bend, (A) earthquake most likely to occur.
What is earthquake?An earthquake is the sudden release of energy from the earth's crust that causes the earth's surface to shake. Seismic waves, also called S waves, are consequently produced. The type and severity of an earthquake are based on the local seismic activity.
What is Volcanic Eruption?A volcanic eruption occurs when elements of the Earth, such as hot lava, rocks, and dust, erupt from a volcano in the form of an explosion. The upper portion of the volcano or one of the side branches may explode. If massive volumes of rock and volcanic ash begin to erupt, it might be dangerous. Occasionally, numerous lives are lost in these explosions.
When tectonic plates are strained to the point that they can no longer bend, in such scenario, earthquake is most likely to occur.
Learn more about earthquake here:
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Terry can ride 30 miles in 2 hours. If his riding speed is
reduced by 3 mph (mile/hour), how far can he ride in 1.7 hours?
miles
Answer: 20.4 miles
Explanation:
Here we need to use the equation:
Velocity = Distance/Time.
Initially we have that he can travel 30 miles in 2 hours, so the velocity is:
V = 30mi/2h = 15mph
Now, we reduce the velocity by 3 mph, so the new velocity is 15mph - 3 mph = 12mph.
Now we want to know the distance traveled in 1.7 hours with this velocity, this is.
Velocity*Time = Distance
12mi/h*1.7h = 20.4 miles
Why aren't the right-hand rules used to figure out the force exerted on particles traveling parallel to a magnetic field?
Answer:
The answer would be the first option. This occurs because of the presence of the protons. The positive charge of protons and the negative charge of electrons set the balance of each other and usually the net charge turn out to be zero.
Answer:
A magnetic field does not exert a force on particles traveling parallel to the magnetic field.
Explanation:
This is the PLATO answer.
The white disks in the petri plates are soaked in herbicide, which affects the roots, stalks, leaves, and cobs of a corn plant. If the transformed plants were grown in the presence of herbicide, which corn plant would result from the choices shown below?
A. Corn plant A.
B. Corn plant B.
C. Corn plant C.
D. Corn plant D.
Answer: Corn Plant C
HOPE THIS HELPS
STAY SAFE
-Carrie
P.S. It would mean a lot if you marked brainliest <3
What is true of both gravity and magnetism?
Both are dependent on mass.
Both forces can act without objects touching.
Both forces are directly proportional to the distance between the objects.
Neither is a fundamental force of nature.
Explanation:
I want to say option B - Both forces can act without objects touching.
A negative test charge experiences a force to the right as a result of an electric field. Which is the best conclusion to draw
based on this description?
The electric field points to the left because the force on a negative charge is opposite to the direction of the field,
The electric field points to the right because the force on a negative charge is in the same direction as the field,
No conclusion can be drawn because the sign of the charge creating the field is unknown,
No conclusion can be drawn because the amount of charge on the test charge is unknown.
Answer:a
Explanation:
Answer: ( A )
Explanation: the answer is a
How does increasing the distance between charged objects affect the electric force between them?
OOOO
The electric force increases because the distance has an indirect relationship to the force.
The electric force increases because the distance has a direct relationship to the force.
The electric force decreases because the distance has an indirect relationship to the force.
The electric force decreases because the distance has a direct relationship to the force.
Answer:it’s c :)
Explanation:
Answer:
the electric force decreases because the distance has an indirect relationship to the force
Explanation:
An energy-efficient electric fan converts a large portion of the electrical energy that enters it into __________.
A. Sound energy in the fan's motor
B. Kinetic energy of the fan blades
C. Thermal energy in the fan's motor
D. An unwanted form of energy
An energy-efficient electric fan converts a large portion of the electrical energy that enters it into kinetic energy of the fan blades. Hence, option (B) is correct.
What is efficiency?Efficiency is the ability to achieve something or get a desired outcome without wasting resources, time, money, energy, or effort. In a broader sense, it is the capacity to carry out tasks effectively and efficiently.
It denotes the degree of performance that requires the fewest inputs to provide the greatest amount of output in more mathematical or scientific words.
It frequently particularly refers to the ability of a particular application of effort to deliver a particular output with the least amount of waste, expense, or superfluous work. Efficiency covers a wide range of inputs and outputs across numerous disciplines and sectors.
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In a nuclear fusion reaction, the mass of the products is _____ the mass of the reactants.
Answer:
more than
Explanation:
In a nuclear fusion reaction, the mass of the products is more than the mass of the reactants.
Balance the following chemical reactions: question attached hellpp
Pretend you are explaining to a friend an object's energy can change depending on the position of the object. Use details from the text to help you write your conversation below.
The text is the picture
I WILL MARK YOU AS BRAINLIEST
Answer:
sorry, need better iinformation
Explanation:
.
Answer:
i am confused
Explanation:
An electric field around two charged objects is shown.
Two spheres next to each other. Vectors perpendicular to each surface spread out and go to the other charge. The vectors are from the charge on the left, labeled X, and to the other charge, labeled Y. The vectors on the opposite sides of the charges are not bent.
What are the charges of objects X and Y?
Answer: D
X: positive
Y: negative
Explanation:
It's either A or D and I chose A and got it wrong.
Answer:
D) Y and Z are opposite charges, but their identities cannot be determined.
Explanation:
i got it right
The distance from the maximum disturbance to the undisturbed position is the____ of a wave
Answer:
The amplitude of a wave is its maximum disturbance from its undisturbed position
Which are descriptions of gravity on Earth? Check all that apply.
an attractive force
a repulsive force
a noncontact force
a contact force
a horizontal force
a vertical force
Answer:
an attractive force
a noncontact force
a vertical force
Explanation:
Gravitational force is a NON-CONTACT FORCE. Gravitational force acts on all bodies on the earth that have mass. The force which is exerted through weight acts on the center of gravity of the body. The force is directed towards the center of the earth. The weight of a body is the gravitational force exerted by the earth on the body.
A,C,F.
Explanation: Got it correct.
Plz help! Will give brainiest!
For the girl to lift this rock, she must push her end down _____ to raise the rock _____.
A. a lot; a little
B. a little; a lot
C. a little; a little
Answer:
A is the correct answer
Explanation:
mark brainliest please
Carbon (C) and hydrogen (H) are pure substances. Each is made of only one type of atom, but carbon atoms are different from hydrogen atoms. Carbon and hydrogen chemically combine to form methane (CH4).
Carbon (C) and hydrogen (H) are pure substances. Each is made of only one type of atom, but carbon atoms are different from hydrogen atoms. Carbon and hydrogen chemically combine to form methane (CH4).
Based on this information,
A.
carbon and hydrogen are elements and methane is a compound.
