26 POINTS!! will give brailest! can anyone help me? if you can't well, Merry Christmas!
Answers
Have an amazing day you are an amazing person:)
Related Questions
In this circuit, energy is transferred from a battery to a circuit wire and then to a light bulb, where some of it leaves the system. Starting from the battery, which series shows the correct order of energy transformations taking place in this circuit?
Answers
Answer: The correct order of energy transformation is from CHEMICAL ENERGY to ELECTRICAL ENERGY to LIGHT ENERGY
Explanation:
Energy which is simply defined as the ability to perform work is made up of different forms, these include:
- Mechanical energy: Associated with machines at work.
- LIGHT ENERGY: produced by light bulbs
- ELECTRICAL ENERGY: taking in by television set and other electrical appliances.
- CHEMICAL ENERGY: stores in food and other fuels
- Sound energy: Produced by vibrating objects example piano, drums.
According to the law of conservation of energy, energy can neither be created nor destroyed in a closed system, but can be transformed from one form to another, thereby keeping the energy in the closed system constant. From the question, the circuit is an example of a closed system and the order of energy transformation taking place is from the battery (CHEMICAL ENERGY) to ELECTRICAL ENERGY(power source) to LIGHT ENERGY(bulb). I hope this helps, thanks.
A Smart Car, which has a mass of 1000 kg, is going 20 m/s. When it hits the barrier, it stops with a time of 0.5 seconds. What is the acceleration of the car?
Answers
Answer:
The acceleration = -40 ms⁻²
Explanation:
Mass m = 1000 kgspeed v₁ = 20 m/sspeed v₂ = 0 m/st = 0.5We know that,
a = (v₂ - v₁) / t
= 0 - 20 / 0.5
= -20 / 0.5
= -40 ms⁻²
Thus, the acceleration = -40 ms⁻²
Note: negative sign gives us an idea the car is slowing down after a collision with the barrier, thus acceleration and velocity is in opposite direction.What do you observe when you switch on your light source
Answers
When a light source is turned on, it emits photons that scatter in different directions and hit every object that is present around it.
What is a Circuit?
This is referred to as the path in which electric current can flow around and comprises of some components such as resistors, bulb etc. There are two types which include open and closed circuit.
When the light source is turned on, the circuit is closed and there is complete flow of electrons which powers up the bulb and gives rise to the emission of the photons which hits objects around it thereby giving rise to the illumination of the area.
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HELP NEEDED
1. What change in Earth's atmosphere allowed life to form?
a
Solar radiation split molecules
b
A meteor strike
c
The formation of the oceans
d
The development of an ozone layer
Answers
Answer:
D the development of an ozone layer
Explanation:
the rest don't relate to the atmosphere
A motor takes 2,280 Joules of electrical energy and turns it into 1,606 Joules
of useful kinetic energy and 550 Joules of wasted thermal energy and sound.
Calculate the efficiency of the motor in percent.
Answers
Answer:
70.4%
Explanation:
Step one:
given data
input energy= 2280J
output energy= 1,606 Joules of useful kinetic and 55joules waste
hence the useful out put= 1606J
Required
The efficiency of the motor
Step two:
what is the efficiency of a motor?
efficiency is the ratio of mechanical power delivered by the motor (output) to the electrical power supplied to the motor (input)
Efficiency= 1606/2280*100
Efficiency=0.704*100
Efficiency=70.4%
Suppose that the distance an aircraft travels along a runway before takeoff is given by , where d is measured in meters from the starting point and t is measured in seconds from the time the brakes are released. The aircraft will become airborne when its speed reaches. How long will it take to become airborne, and what distance will it travel in that time?.
Answers
The aircraft takes 25s to become airborne and will cover a distance of 1.0417km.
Distance, s = [tex]\frac{300km}{1 h}[/tex]
s = [tex]\frac{300 }{1}[/tex] × [tex]\frac{1000m}{3600s}[/tex]
s = [tex]\frac{250}{3}[/tex] m/s
Velocity is the time derivative of the displacement, [tex]v(t)=\frac{d}{dt}(\frac{5}{3}t^{2})[/tex]
[tex]v(t)=\frac{10}{3}t^{2}[/tex]
The time required to reach [tex]v=\frac{500}{3}[/tex] m/s,
[tex]\frac{10}{3}t=\frac{250}{3}[/tex]
[tex]t=25s[/tex]
Now, during this time, the aircraft travels a distance, [tex]D= \frac{5}{3} (25)^{2}[/tex]
[tex]D= 1041.667m[/tex]
[tex]D= 1.0417km[/tex]
Therefore, the aircraft takes 25s to become airborne and will cover a distance of 1.0417km.
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At t=0 s, a bunny is hopping along at 1.0 m/s. It continues at that speed, until at t=10 s, when the bunny begins to slow down with a constant acceleration. It comes to a complete stop at t=12 s. What is the bunny’s displacement at t=12 s? What is the bunny’s acceleration when slowing down?
Answers
The bunny’s displacement at t=12 s is 12 m.
The bunny’s acceleration when slowing down is -0.083 m/s².
What is displacement?The displacement of an object is the change in position of the object.
The displacement of the object at time, t = 12 seconds, is the change in position from time, t = 0 seconds to time, t = 12 seconds.
Δx = v(t₂ - t₁)
Δx = 1 m/s (12 s - 0 s)
Δx = 12 m
Bunny’s acceleration when slowing downThe bunny’s acceleration when slowing down is calculated as follows;
a = (v - u)/(t₂ - t₁)
a = (0 - 1 m/s) / (12 s - 0 s)
a = -0.083 m/s²
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Answer:
The bunny’s displacement at t=12 s is 12 m.
The bunny’s acceleration when slowing down is -0.083 m/s².
Neha and Suhani are playing with two identical pendulums. They leave the bob from a certain position and wait for it to return to the same point. The one who waits for a shorter time wins. Neha leaves her pendulum from point L and Suhani leaves her pendulum from point P (see figure). What happens?
a. Neha wins as her bob comes back faster.
b. Suhani wins as her bob comes back faster.
c. No one wins as the bobs come back at the same time.
d. We cannot say any of the above for sure.
Answers
Answer:
The correct option is C
Explanation:
The pendulum bob would return at the same time because the initial angle a pendulum bob is dropped does not affect it's period (the time it takes for the pendulum to move back and forth), however the one with a larger angle move faster but would eventually arrive at the same "starting point" due to varying displacements made.
c. No one wins as the bobs come back at the same time.
The pendulum bob would return at the same time because the initial angle a pendulum bob is dropped does not affect it's period (the time it takes for the pendulum to move back and forth), however the one with a larger angle move faster but would eventually arrive at the same "starting point" due to varying displacements made.The longer the length of string, the farther the pendulum falls; and therefore, the longer the period, or back and forth swing of the pendulum. The greater the amplitude, or angle, the farther the pendulum falls; and therefore, the longer the period.)Learn more:
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The creation and study of new and very massive elementary particles is an important part of contemporary physics. To create a particle of mass M requires an energy M c² . With enough energy, an exotic particle can be created by allowing a fast-moving proton to collide with a similar target particle. Consider a perfectly inelastic collision between two protons: an incident proton with mass mp , kinetic energy K , and momentum magnitude p joins with an originally stationary target proton to form a single product particle of mass M . Not all the kinetic energy of the incoming proton is available to create the product particle because conservation of momentum requires that the system as a whole still must have some kinetic energy after the collision. Therefore, only a fraction of the energy of the incident particle is available to create a new particle.(b) This problem can be alleviated by using colliding beams as is the case in most modern accelerators. Here the total momentum of a pair of interacting particles can be zero. The center of mass can be at rest after the collision, so, in principle, all the initial kinetic energy can be used for particle creation. Show thatM c² =2 m c² ((1+1/km /c²))where K is the kinetic energy of each of the two identical colliding particles. Here, if K>>m c² , we have M directly proportional to K as we would desire.
Answers
Therefore, Mc² = 2mc²[ 1 + (K/mc²)] where K s the kinetic energy of each of the two identical colliding particles.
Consider a collision between two protons that is perfectly inelastic: an incident proton with mass m(p), kinetic energy K, and momentum magnitude p combines with a target proton that was initially stationary to form a single product particle with mass M.
Now,
In this case, the problem is alleviated by using colliding beams.
A pair of interacting particles' combined momentum may be zero.
After the collision, the center of mass is at rest.
Therefore, all the initial kinetic energy can be used to create particles.
Let K be the kinetic energy of each of the two identical colliding particles.
Therefore, the energy released by the two colliding beams are:
E₁ = K + mc² and E₂ = K + mc²
In the final state,
E(f) = Mc² where M is the new mass of the single product after the collision.
By conservation of energy,
E₁ + E₂ =E(f)
K + mc² + K + mc² = Mc²
2K + 2mc² = Mc²
Taking 2mc² common, we get
Mc² = 2mc²[ 1 + (K/mc²)]
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Identify the forces on the same cart at rest
Answers
Answer:
you can go to quizlet
Explanation:
Speed of truck is 40ms-1 after 10 seconds its speed decreases to 20n s-1 its acceleration is
Answers
The negative acceleration of the truck is -2 m/s.
Acceleration of the body is the rate of change of speed with respect to time. The acceleration of the body is calculated by dividing the change in speed during a particular interval of time, by the time taken to change the speed.
According to the question, the initial speed of the truck is 40 m/s and it decreases to 20 m/s after 10 seconds. As the speed of the truck is decreasing, its sign is negative.
So given in the question
Initial Speed= u = 40 m/s
Final Speed= v = 20 m/s
Change in velocity = v - u
= 20 - 40
= -20 m/s
Time interval = 10 seconds
Acceleration = Change in Velocity/Time interval
= -20/10
= -2 m/s
So the acceleration of the truck is equal to -2 m/s. The negative sign indicates the speed is decreasing.
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A 1.50 kg ball moving at 8.00 m/s south, strikes a 2.00 kg ball moving at 3.00 m/s south. If the velocity of the 2.00 kg ball after the collision is 4.50 m/s south, what is the velocity of the 1.50 kg ball
Answers
Answer:
6m/s
Explanation:
Given that a 1.50 kg ball moving at 8.00 m/s south, strikes a 2.00 kg ball moving at 3.00 m/s south. If the velocity of the 2.00 kg ball after the collision is 4.50 m/s south, what is the velocity of the 1.50 kg ball
This is elastic collision.
M1U1 + M2U2 = M1V1 + M2V2
Substitute all the parameters into the formula above
1.5×8 + 2×3 = 2×4.5 + 1.5V
12 + 6 = 9 + 1.5V
18 = 9 + 1.5V
1.5V = 9
V = 9/1.5
V = 6 m/s
Therefore, the velocity of the 1.5kg ball is 6 m/s
definition of velocity
Answers
Answer:
Velocity is the directional speed of a object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by a particular standard of time.
Explanation:
Answer:
in a given direction it is a speed of something
Explanation:
velocity tells how much distance is covered by an object in other words we can tell the quickness of motion
A car changes its speed by 2 meters per second each second. What is its acceleration?
A. 4 m/s2
B. 0.5 m/s2
C. 2 m/s2
Answers
Answer:
2 m/s²
Explanation:
If changes speed by 2 meters per second each second means:
2 m/s²
Because it changes constantly it veloctity.
Remember the aceleration changes the velocity.
Answer:
c. 2 m/s2
is the right answer.
What are three key processes that alter the surface of an object and make it show less cratering?
Answers
The three key processes that alter the surface of an object and make it show less cratering. The size and shape of the crater and the amount of fabric excavated rely upon elements such as the speed and mass of the impacting frame and the geology of the floor. The faster the incoming impactor, the bigger the crater.
An effect crater is formed whilst an item like an asteroid or meteorite crashes into the floor of a larger solid item like a planet or a moon. The excavation of bowl-formed depressions via asteroids or comets putting a planet's surface.
Crater diameter is proportional to the mass and velocity of the impactor. based totally on the kinetic electricity equation, kinetic power=1/2mv^2, speed increases have a greater impact on a crater diameter than mass will increase when you consider that pace is squared.
The scale of the impact crater relies upon such factors as the size and velocity of the impacting item and the attitude at which it strikes the floor of the Earth. Meteorite flux is the full mass of extraterrestrial items that strike the Earth.
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What are brown bears doing as a result of panting?
maintaining internal water levels by releasing moisture
maintaining internal water levels by taking in moisture
maintaining body temperature by warming up
maintaining body temperature by cooling down
Answers
They are maintaining their body temperature by cooling down, like dogs do, as they don't have enough sweat glands to keep them cool without panting.
Brown bears maintain body temperature by cooling as a result of panting. So, the correct option is D.
What is Body temperature?Normal human body-temperature is defined as the typical temperature range found in humans which is commonly referred to as 36.5–37.5 °C. The human body temperature varies. Temperature is known as the degree of hotness or coldness of an area or object.
When we are very hot, the blood vessels of the skin dilate to carry the excess heat to the surface of the skin. Brown bear panting ensures that cool air circulates over the moist surfaces in the mouth which helps maintain body temperature by cooling the body.
Therefore, the correct option is D.
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Please help me djhrhtjskakjdh
Answers
Answer:d
Explanation:
the height of a toy rocket that is shot in the air with an upward velocity of 48 feet per second can be modeled by the function f (x)
Answers
The maximum height that the toy rocket reaches is 36feet.This is a type of projectile motion.
What is projectile motion?An object being launched or projected into the air will move in a projectile motion, with the sole acceleration coming from gravity. Projectile motion has many uses in both physics and engineering. Examples include the motion of any ball in sports, fireworks, and meteors entering the Earth's atmosphere. These things are known as projectiles, and the path they take is known as a trajectory. As stated in Motion Along a Straight Line, the motion of falling objects is a straightforward one-dimensional type of projectile motion with no horizontal movement. In this part, we focus on projectile motion in two dimensions while ignoring the effects of air resistance.
Explanation:
Given function is:
[tex]f(t)= -16t^{2} + 48t[/tex]
Where t = time in seconds since the toy rocket was shot.
f(t) = the toy rocket’s height in feet.
In order to get the maximum height, we need to find out the time when the rocket will reach maximum height.
For this, [tex]f^{'} (t)=0[/tex] and find t, again check f''(t), if its value is negative, put t in f(t) to get the maximum height.
[tex]f^{'} (t)=\frac{d}{dt} (-16t^{2} +48t) =0[/tex]
-32t + 48 =0
t = 1.5
f''(t) = -32, This means t=1.5 will be the time when the rocket will be at maximum height, or mathematically t will be the point of local maxima.
So, maximum height = f(1.5) = -16*(1.5)² + 48*1.5 = 36feet
Therefore, the maximum height that the toy rocket reaches is 36feet.
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A cubical surface surrounds a point charge q . Describe what happens to the total flux through the surface if (c) the surface is changed to a sphere
Answers
Gauss law states that the electric flux is defined as the electric field multiplied by the area of the surface in a plane perpendicular to the field.
Mathematically,
Φ=Q ϵo
Where;
Q is enclosed charge
ϵo is the permittivity of the free space
According to Gauss law, which states that the electric flux is defined as the electric field multiplied by the area of the surface in a plane perpendicular to the field.
Φ=Q ϵo
Where;
Q is enclosed charge
ϵo is the permittivity of the free space
If the cube is transformed into a sphere the total flux in the electric field remains unchanged or remains the same. This is because the gaussian law does not postulate that electric flux is dependent on the object in a plane. Hence, the transformation of the cube to a sphere does not affect the electric flux generated in the field.
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The question is on the picture
Answers
Answer:
think 2 also if not im so sorry but i think it is :)
which mixture is most likely to be homogeneous?
Answers
We can't tell what they're pouring glue on, but I would go for B since homogenous means of the same, and none of them are mixing things that are the same.
An airplane flies with constant velocity.
Which claim about the forces acting on the airplane must be true?
Answers
Answer: True
Explanation:
Answer:
There is no net force on the airplane.
Explanation:
correct answer for khan
Please I need HELP WITH THIS QUESTION!!!
Question: List 3 common lubricants.
Its 7th Grade science Ill mark Brainlist!!!
Answers
At night the sand cools off...
Conduction
Convection
Or radiation
Answers
Answer:
I feel like it's Convection because if its dry , then the water comes over it and it warms it also the sun gives it light it's gonna be more warmer. So I think your answer will be Convection.
Explanation:
Because conduction is Anything being warmed by objects touching.
And radiation is Anything being warmed by heat transferring through space.
And the meaning of Convection is Anything being warmed in WATER.
I hope this is right and I hope this will help you in any way!! <3
Does the phenomenon of wave interference apply only to sinusoidal waves?
Answers
No , the phenomenon of wave interference apply to all form of the wave.
Superposition theorem - If quite one supply acts at the same time in an electrical circuit, then this through anyone of the branches of the circuit is that the summation of currents which might flow through that branch for every supply acting alone, keeping all the opposite sources deadWave interference is that the development that happens once 2 waves meet whereas traveling on constant medium. The interference of waves causes the medium to require on a form that results from cyberspace result of the 2 individual waves upon the particles of the medium.No , waves with alternative wave forms are trains of disturbance that add along once waves from totally different sources move through constant medium at constant time.
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In a reverse fault, the fault part that lies below the other part is called the _____.
A. syncline
B. shear wall
C. footwall
D. hanging wall
PLZ HELP!
Answers
Answer:
D
Explanation:
A 0.0780 kg lemming runs off a
5.36 m high cliff at 4.84 m/s. What
is its potential energy (PE) when it
lands?
Answers
Answer:
Ek = Ekv + Ekh = 4.101 + 0.914 = 5.015J
Explanation:
A 0.0780 kg lemming runs off a 5.36 m high cliff at 4.84 m/s. What is its potential energy (PE) when it lands
The potential energy PE, relative to the ground, will be zero, because the lemming is at the ground level.
HOWEVER, a much better question would be:
A 0.0780 kg lemming runs off a 5.36 m high cliff at 4.84 m/s. What is its kinetic energy (KE) when it lands?
Let’s review the 4 basic kinematic equations of motion for constant acceleration (this is a lesson – suggest you commit these to memory):
s = ut + ½at^2 …. (1)
v^2 = u^2 + 2as …. (2)
v = u + at …. (3)
s = (u + v)t/2 …. (4)
where s is distance, u is initial velocity, v is final velocity, a is acceleration and t is time.
In this case, u = 0, a = 9.81m/s^2, s = 5.36m
So we find v using equation (2)
v^2 = u^2 + 2as
v^2 = 0 + 2(9.81)(5.36) = 105.1632
So the kinetic energy resulting from the vertical drop is Ekv = ½mv^2
Ekv = ½(0.078)(105.16) = 4.101J
BUT we need to add in the kinetic energy resulting from the horizontal velocity, which did not change during the vertical drop.
Ekh = ½(0.078)(4.84^2) = 0.914J
So the total kinetic energy is Ek = Ekv + Ekh = 4.101 + 0.914 = 5.015J
The potential energy of the object with a mass of 0.0780 kg moving from a height of 5.36 m is 4.09 J.
What is potential energy ?Potential energy of an object is generated by virtue of its position at a height from the ground. It is stored in the object when it is at rest, Whereas, kinetic energy is generated by virtue of the motion of the body. These energies are together called mechanical energy of the object.
When the object starts moving from rest, its potential energy starts to convert into kinetic energy and when it stops the reverse occurs . The potential energy of a body is dependant on its mass and height by the equation:
p = mgh
Given that, mass of the object = 0.078 kg
height h = 5.36 m
acceleration due to gravity g = 9.8 m/s²
then potential energy p = 0.078 × 9.8 m/s² ×5.36 m = 4.09 J
Therefore, the potential energy of the lemming is 4.09 J.
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An nfl caliber wide receiver can reach a top speed of 10.0 m/s in only 2.4 s. what is their acceleration during this time?
Answers
The nfl caliber wide receiver that can reach a top speed of 10.0 m/s in only 2.4 s has an acceleration during this time of: 4.16 m/s²
The formula and procedure we will use to solve this exercise is:
a = (vf - vi) /t
Where:
a = accelerationvf = final velocityvi = initial velocityt = timeInformation about the problem:
vi= 0 m/svf = 10.0 m/st = 2.4 sa=?Applying the acceleration formula we have:
a = (vf - vi) /t
a = (10.0 m/s - 0 m/s) /2.4 s
a = (10.0 m/s) /2.4 s
a = 4.16 m/s²
What is acceleration?It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2
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imagine a square column of the atmosphere, 10 m on a side, that extends all the way to the top of the atmosphere.
Answers
The calculated weight in newtons is 10 N.
Listed below is the data we will use:
Area A is where the pressure is P. Here are the details we were given:
A=1 cm2, P=101325 N/m, and w=?
Do the area conversion to square meters.
A=1cm2×1m2/1002cm2\s=1×10−4m2
From the definition of pressure, calculate the weight of the air column. In this instance, the air column's weight is determined by multiplying the atmospheric pressure by the air column's base area.
Fw = P atm A
= (101325N/m2) (1 10 4m2)
= 10N
The complete question is - Imagine a square column of the atmosphere, 1 cm on a side, that extends all the way to the top of the atmosphere. How much does this column of air weigh in newtons?
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A bug crawls 4 meters east across the kitchen floor in 20 seconds before someone steps on it and squishes it. What is its velocity?
Answers
Considering the definition of velocity, the velocity is 0.2 m/s due east.
Definition of velocityVelocity is a physical magnitude that relates the displacement of an object, the time it takes to make this change in position and direction, so it is considered a vector magnitude.
In other words, the velocity can be defined as the amount of space traveled per unit of time with which a body moves, considering the direction, and can be calculated using the expression:
velocity= distance traveled÷ time
Velocity has units of distance/time and includes direction of travel.
This caseIn this case, you know:
distance traveled= 4 meterstime= 20 secondsdirection= eastReplacing in the definition of velocity:
velocity= 4 meters÷ 20 seconds
Solving:
velocity= 0.2 m/s
Finally, the velocity is 0.2 m/s due east.
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