Answer:
Graphite.
Explanation:
Graphite: "a gray crystalline allotropic form of carbon which occurs as a mineral in some rocks and can be made from coke. It is used as a solid lubricant, in pencils, and as a moderator in nuclear reactors."
a particle starts from rest and moves with a constant acceleration of 0.5 m/s². Calculate the time taken by particle to cover a distance of 25 m
As the ball rolls down the ramp, there are changes in kinetic and potential energy. How much kinetic energy does the
ball have when it reaches point B?
A) 0J
B) 25J
C) 50J
D)100J
The answer is C, 50J
Please mark brainliest Have a nice day :)
Please need help ASAP 15 points????I need a,b,c
Answer:
The acceleration is negative and very close to zero.
Very Small, because it slowly comes to a stop, which means there is nothing to stop it any faster
It would keep traveling in that direction without slowing down
Explanation:
Answer:
A,B,C
Explanation:
A) because the ball is slowing down that means that the acceleration is changing and is slowing. It also means that it has negative acceleration because it is going the opposite way of velocity. When it stops then there is no more acceleration
B) Net force is calculated by the sum of the forces that are acting on the object. If the net force is unbalanced then it will speed up, slow down, or change direction. So basically, net force is an unopposed force that causes a change in motion. First, it has a net force because it's moving and is not in equilibrium. Second, the net force would be changing as it is stopping. When it stops then it would be in static equilibrium. Basically, the net force is changing as the speed slows down until it comes to a state of equilibrium.
C) If it was in space then it would never stop. Because of the law of inertia, an object in motion will stay in motion as long as there are no other opposing forces. Because there really aren't opposing forces in space, it would keep on going forever.
Which experimental discovery led Niels Bohr to revise Rutherford's model of
the atom?
A. Most alpha particles pass straight through a thin sheet of gold
foil.
B. Electrons have more energy the farther they are from the nucleus.
C. A few alpha particles bounce off a thin sheet of gold foil.
D. The beam in a cathode ray tube is moved by an electric force.
Answer:
Electrons have more energy the farther they are from the nucleus.
Explanation:
A P E X
What is the force required to move a 5,000 kg car with an acceleration of 4 m/s?
Answer:
20000
Explanation:
f=m*a
mass=5000
a=4
5000*4=20000
While john is traveling along a straight in interstate highway, he notices that the mile marker reads 242 mm. John travels until he reaches the 147 km marker and then retraces his path to the 161km marker. What is John's resultant displacement from the 242km marker? How far has he traveled answer in units of km
Complete Question
While john is traveling along a straight in interstate highway, he notices that the mile marker reads 242 km. John travels until he reaches the 147 km marker and then retraces his path to the 161 km marker. What is John's resultant displacement from the 242 km marker? How far has he traveled answer in units of km
Answer:
The resultant displacement [tex]\Delta x _{1 , 3} = 81 \ km[/tex]
The total distance traveled by john is [tex]x_t =109 \ km[/tex]
Explanation:
From the question we are told that
The first position of john from the finish point is [tex]x_1 = 242 \ km[/tex]
The second position of john from the finish point is [tex]x_2 = 147 \ km[/tex]
The third position of john from the finish point is [tex]x_3 = 161 \ km[/tex]
Generally the displacement from the 242 km marker is mathematically represented as
[tex]\Delta x _{1 , 3} = x_1 - x_3[/tex]
Here we used [tex]x_3[/tex] instead of [tex]x_2[/tex] because [tex]x_3[/tex] is further than [tex]x_2[/tex] from the finish point
=> [tex]\Delta x _{1 , 3} = 81 \ km[/tex]
Generally the total distance traveled by John is mathematically evaluated as
[tex]x_t = [x_1 - x_2 ] + [x_3 - x_2][/tex]
=> [tex]x_t = [242 - 147 ] + [161 - 147][/tex]
=> [tex]x_t =109 \ km[/tex]
As the frequency of a wave increases...
A.)the energy carried by the wave decreases
B.)the wavelength of the wave decreases
C.)the amplitude of the wave decreases
D.)the speed of the wave increases
The relationship that exists between gravity and distance and mass respectively.
A. The gravitational force is directly proportional to the distance between objects and inversely
proportional to the mass of the objects.
B. The gravitational force is inversely proportional to the distance between objects and directly
proportional to the mass of the objects.
C. The gravitational force is inversely proportional to the distance between objects and inversely
proportional to the mass of the objects.
D. The gravitational force is directly proportional to the distance between objects and directly
proportional to the mass of the objects.
Answer:
D...............................
Select all the correct answers. The eight planets in alphabetical order are Earth, Jupiter, Mars, Mercury, Neptune, Saturn, Uranus, and Venus. Half of them are inner planets and half of them are outer planets. Which of these planets are inner planets? Mercury Jupiter Earth Mars
Answer:
The inner planets (in order of distance from the sun, closest to furthest) are Mercury, Venus, Earth and Mars. After an asteroid belt comes the outer planets, Jupiter, Saturn, Uranus and Neptune
Explanation:
Answer:
The inner planets (in order of distance from the sun, closest to furthest) are Mercury, Venus, Earth and Mars. After an asteroid belt comes the outer planets, Jupiter, Saturn, Uranus and Neptune
Explanation:
What does Radioactivity mean?
Answer:
Radioactivity means: the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.
Explanation: I hope this helps! :)
Answer:
sending out harmful radiation caused when the nuclei (=central parts) of atoms are broken up.
4.
You are riding your bike and you slam on your breaks. What is most likely the accelerations that your bike undergoes? this is a quiz
Answer:
This question appear incomplete
Explanation:
This question appear incomplete because of the absence of options but when you slam on the brakes when riding a bike or other vehicles, the bike undergoes deceleration. Deceleration is a type of acceleration with a negative value which usually points in the opposite direction of the velocity. As described in the question, deceleration is usually brought about by a decrease in magnitude of a velocity.
Naomi is taking a train from DC to New York which is 360km apart. If the train is traveling at an average speed of 32 meters per second, how much time will it take Naomi to get to new work
Answer:
11250 seconds or 187.5 mins
Explanation:
The formula to be used here is that of speed.
Speed (in m/s) = distance (meter) ÷ time (secs)
The speed provided is 32 meters per second
The distance provided will have to be converted to meters; 360 km = 360 × 1000 = 360000 meters
Thus,
32 = 360000 ÷ time
time = 360000 ÷ 32
time = 11250 seconds or 187.5 mins
It will take Naomi 11250 seconds to get to New York
guys please answer me i will be really thankful
the graph represents the motion of a car moving along a staright highway describe in words the motion car
Line BD is the perpendicular bisector of CA. What additional information would be sufficient to prove that triangle BDA is congruent to triangle BDC by SAS.
Answer:
DA ≅ DC (since BD is equidistant to A and C)
Explanation:
A line bisector is one that divides a given line into two equal parts. And which is equidistant from the ends of the bisected line.
Given: BD is the perpendicular bisector of CA.
Thus:
BD is equidistant to A and C
Also, BD is a common side to ΔBDA and ΔBDC
DA ≅ DC (since BD is equidistant to A and C)
<BDA ≅ <BDC (congruent property)
<ADB ≅ <DBC (alternate angle property)
<CDB ≅ <ABD (alternate angle property)
Thus,
ΔBDA ≅ ΔBDC (Side-Angle-Side, SAS, congruent property)
A paintball is fired horizontally from a tower 45 m above the ground. If the paintball gun fires at 90 m/s… How long does it take for the paintball to hit the ground? How far away from the tower will the paintball land?
Answer:
The time taken for the paint ball to hit the ground is [tex]t = 2.143 \ s[/tex]
The distance of the landing point from the tower is [tex]d = 192.86 \ m[/tex]
Explanation:
From the question we are told that
The height of the tower is [tex]h = 45 \ m[/tex]
The speed of the paintball in the horizontal direction is [tex]v_x = 90 \ m/s[/tex]
Generally from kinematic equation we have that
[tex]h = ut + \frac{1}{2} at^2[/tex]
Here u is the initial velocity of the paintball in the vertical direction and the value is 0 m/s , this because the ball was fired horizontally
a is equivalent to [tex]g = 9.8\ m/s^2[/tex]
t is the time taken for the paintball to hit the ground
So
[tex]45 = 0* t + \frac{1}{2} 9.8 * t^2[/tex]
=> [tex]t = 2.143 \ s[/tex]
Generally the distance of its landing position from the tower is
[tex]d = v * t[/tex]
=> [tex]d = 90 * 2.143[/tex]
=> [tex]d = 192.86 \ m[/tex]
the value of g is greater at the poles than at the equator why
Answer:
because the gravitational pull is maximum at the poles and decreases as it comes down toward the equator.
Diane is training for a marathon and goes to the track (400 m) to run every morning.
If Diane runs around the track four times, what is her final displacement?
280 m
If Diane runs around the track 6 times, what is the distance she travels?
Which is moving faster a car traveling 150 km in 3 hours or one traveling 100 km in 2 hours?
What is the Law of Conservation of Energy?
Answer:
The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another.
Explanation:
Hope this helped, Have a Great Day!!
The amount of work done to bring an electron (q = −e) from right side of hydrogen nucleus to left side in the k shell is__________. Let the radius (r) of atom is 52 pm a) Zero b) infinity c) Fr d) 2Fr
Answer:
d) 2Fr
Explanation:
We know that the work done in moving the charge from the right side to the left side in the k shell is W = ∫Fdr from r = +r to -r. F = force of attraction between nucleus and electron on k shell. F = qq'/4πε₀r² where q =charge on electron in k shell -e and q' = charge on nucleus = +e. So, F = -e × +e/4πε₀r² = -e²/4πε₀r².
We now evaluate the integral from r = +r to -r
W = ∫Fdr
= ∫(-e²/4πε₀r²)dr
= -∫e²dr/4πε₀r²
= -e²/4πε₀∫dr/r²
= -e²/4πε₀ × -[1/r] from r = +r to -r
W = e²/4πε₀[1/-r - 1/+r] = e²/4πε₀[-2/r} = -2e²/4πε₀r.
Since F = -e²/4πε₀r², Fr = = -e²/4πε₀r² × r = = -e²/4πε₀r and 2Fr = -2e²/4πε₀r.
So W = -2e²/4πε₀r = 2Fr.
So, the amount of work done to bring an electron (q = −e) from right side of hydrogen nucleus to left side in the k shell is W = 2Fr
Is it possible to generate emf without rotating the coil explain
Answer:
It's not possible.
Explanation:
It's not possible.
This is because when a coil is rotated in a magnetic field about a line which is not the axis of the coil, the magnetic coil with a link going through the coil will change and thus an EMF will be produced.
Now, this EMF produced is gotten as a result of cutting action through lines of magnetic flux gotten through rotation (physical movement) of the coil through space.
Faraday's law allows finding the result for whether it is possible to create induced electromotive force (emf) without rotating the coil are:
Producing a pulsating voltage is possible change the magnetic field the area of the loop. Producing constant voltage is not possible since a uniform change of some parameter is required and the only one that can change is the angle constantly.
Faraday's Law states that by varying the magnetic flux an electromotive force is produced.
[tex]emf = - \frac{d \Phi_B }{dt} \\\Phi_B = B . A[/tex]
Where emf is the induced voltage, Ф the magnetic flux, B the magnetic field and A the area of the loop
We can write the flow explicitly.
Ф = B A cos θ.
Therefore we see that there is some form of having this changing flow:
Changing the magnitude of the magnetic field. Changing the area of the loop. Changing the angle between the normal to the area and the magnetic field direction.
The first two methods are used in pulsating fields, that is, a voltage is obtained for a short period of time.
The last method is used in equipment that can give indicated voltage in a constant way, it is the method used to produce electricity, it consists of an external system that rotates the loop with a constant speed and produces an output voltage.
In conclusion using Faraday's law we can find the result for whether it is possible to create induced electromotive force (emf) without rotating the coil are:
Producing a pulsating voltage is possible change the magnetic field the area of the loop Producing constant voltage is not possible since a uniform change of some parameter is required and the only one that can change is the angle constantly.
Learn more here: brainly.com/question/1640558
What moon phase would happen immediately before the shown phase?
Waning Crescent
Waxing Gibbous
Full Moon
New Moon
Answer:
waning crescent
Explanation:
Waxing Crescent - Rises before noon, transits meridian before sunset, sets before midnight
Answer:
new moon
Explanation:
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15 points. give me the method.
4.The difference of wavelength of two waves of frequencies 640Hz and 480Hz respectively in a certain medium is 1m. Find the velocity of sound in that medium.
Answer:
[tex] \boxed{{160 \: m(s)}^{ - 1} }[/tex]
Explanation:
[tex]if \:the \: frequencies \: are \to \\ f_{1} = 640Hz \\ and \\f_{2} = 480Hz \: \\ but \: \boxed{v = f \gamma }: f = \frac{v}{ \gamma } \\ if \: \gamma_{1} - \gamma _{2} = 1 = \gamma \\ f_{1} - f_{2} = 640 - 480 = \boxed{ 160Hz} = f \\ v = f \gamma = 160 \times 1 = \boxed{{160 \: m(s)}^{ - 1} }[/tex]
- A type of elevator called a cage is used to raise and lower miners in a mine
shaft. Suppose the cage carries a group of miners down the shaft. If the
unbalanced force on the cage is 60.0 N, and the mass of the loaded cage is
1.50 10 kg, what is the acceleration of the cage?
a bird is traveling west with a velocity of 8 m/s and momentum of 40 mg*m/s what's the birds mass?
Answer:
m = 5 [mg]
Explanation:
We must remember that the definition of linear momemtum is defined as the product of mass by distance.
P = m*v
P = momentum = 40 [mg*m/s]
m = mass [mg]
v = velocity = 8 [m/s]
Now clearing m:
m = P/v
m = 40/8
m = 5 [mg]
All elements are composed of extremely small particles called
Which two elements have similar properties and 8 electrons in their
outermost shells?
Answer:
A. Neon and argon
General Formulas and Concepts:
Reading the Periodic Table of ElementsValence Shell configurationsExplanation:
Elements that have a full valence shell (the outermost shell), are in Group 18 of the Periodic Table.
Because their outermost shell is full, they are inert, meaning that they do not like to bond or react with other elements.
Therefore, these gases with a stable full valence shell are known as Noble Gases.
HeliumNeonArgonKryptonXenonRadonA. would be the correct answer.
Answer:argon and krypton
Explanation:
Noble gases
The human body is a system of systems that rely on each other to sustain a life. Explain how.
with what force will the a car hit a tree if the car has a mass of 3,000 kg and a acceleration of 2m/s^2
Answer:
The answer is 6000 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 3000 × 2
We have the final answer as
6000 NHope this helps you
WILL GIVE BRANLIEST TO WHOEVER ANSWERS CORRECTLY
We are going to design a free-fall ride in which our vehicle has a velocity of 33m/s once the vehicle reaches the bottom.
Calculate how tall the ride would have to be in order for the vehicle to reach a velocity of 33m/s.
Answer:
We might know that the greater the acceleration of, say, a car moving away from a stop sign, the greater the displacement in a given time. But we have not developed a specific equation that relates acceleration and displacement. In this section, we develop some convenient equations for kinematic relationships, starting from the definitions of displacement, velocity, and acceleration already covered.
Explanation:
Answer:9 meters?
Explanation:
