Answer:
Car A has twice the energy of car B.
Explanation:
The kinetic energy of an object is given by :
[tex]K=\dfrac{1}{2}mv^2[/tex]
Where
m is the mass
v is the speed of the object
Car A has twice the mass of Car B. Both travel at the same speed i.e.
[tex]m_A=2m_B[/tex]
So,
[tex]\dfrac{K_A}{K_B}=\dfrac{(1/2)m_Av^2}{(1/2)m_Bv^2}\\\\=\dfrac{2m_B}{m_B}\\\\\dfrac{K_A}{K_B}=2\\\\K_A=2\times K_B[/tex]
So, the kinetic energy of car A is twice of the kinetic energy of car B.
Answer:
Car A has twice the energy
Explanation:
what is rickrolling
...
Answer:
"a prank and an Internet meme involving an unexpected appearance of the music video for the 1987 Rick Astley song "Never Gonna Give You Up". The meme is a type of bait and switch using a disguised hyperlink that leads to the music video."
Explanation: G O O G L E
Answer:
here:Rick Astley - Never Gonna Give You Up (Official Music Video)
Explanation:
what allows electrons to move through it easily
Answer:
materials that allow many electrons to flow freely are caused conductors such as copper, silver, aluminum, hydrochloric solution, sulfuric acid, and salt water. in contrast materials which allow few electrons to flow are called insulators such as plastic, rubber, glass, and dried paper.
Explanation:
Hope this helped Mark BRAINLEST!!
I can't understand
like which energy changes are involved
which energy it was first and which it was converted into
Answer:
turtle
Explanation:
hey, what is rectilinear propagation of light ?
ANSWER QUICK! In an experiment, a scientist places human red blood cells in seawater. What changes do you think would be made to the red blood cells due to osmosis? Cite facts about osmosis to support your prediction.
NEED HELP ASAP
thanks+BRAINLIST a only for correct answers
Thank you!
1.which type of image is right side up but left and right are reversed
A.real
B.virtual
2.Real images are:
A.always inverted
B.magnified or diminished
C.can be obtained on screen
D.all the above
Answer:
see below
Explanation:
1) B, virtual because the when you stand in front of a mirror, the image formed is virtual and Image is laterally inverted
2) D because, when using converging lens , real image is formed, it is inverted and it can also be magnified or diminished when the object is placed at different focal length.
real image can be captured on the screen because light rays meet at the image position
when using converging lens, the image formed if it is virtual is upright.
hope this helps
how do crumple zones extend the deceleration of a car?
how do crumple zones help redistribute the force of an impact?
Answer:
Uv rays
Explanation:
ultraviolet rays of the suun gives force
Answer:
what zones
Explanation:
PLS ANSWER FAST WILL GIVE BRAINLY!! BUT ONLY IF YOU KNOW!!
Fill in the blank
The atomic number is the same as the number of____in an atom
3) In the numbers: 0, 1, 2, 3, 4, 5; which number will you read properly
in mirror? Explain
Answer:
it'll be 0
Explanation:
What is the GPE of a 15,000 kg airplane sitting on the ground?
A. 150,000 J
B. 1,500,000 J
C. 0 J
D. 15,000 J
Answer:
C, it is not moving
it has no potential
1. Which is an example of chemical potential
energy changing to kinetic energy?
A. a flag flapping in the wind
B. logs burning on a fire
C. using a battery in a flashlight
D. burning fuel to move a car
The graph is the path Beth took on a walk.
A graph with horizontal axis time (seconds) and vertical axis position in (meters). The line runs in 2 straight segments from 0 seconds 2 meters to 6 seconds 8 meters to 10 seconds 0 meters.
What does the line from time 6 to 10 indicate?
Beth slowed down considerably.
Beth went back toward her origin.
Beth sped up considerably.
Beth went farther away from origin
Answer:
Beth went back toward her origin
Explanation:
Answer:
B
Explanation:
Hope this helps :)
A bowling ball is thrown at a distance of 0.5 m toward the pins. If it takes the
bowling ball 2.3 seconds to reach the pins, what is the speed of the bowling
ball?
Answer:
Speed = 0.217 m/s
Explanation:
Given the following data;
Distance = 0.5m
Time = 2.3 seconds
To find the speed;
Speed = distance/time
Speed = 0.5/2.3
Speed = 0.217 m/s
Therefore, the speed of the bowling
ball is 0.217 meter per seconds.
what hapenes to the wavelength of a wave if the frequency of the wave is increased?
Answer: The number of complete wavelengths in a given unit of time is called frequency (f). As a wavelength increases in size, its frequency and energy (E) decrease. From these equations you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.
Explanation:
Describe the movement of the Moon.
Someone please help with this one and the other I posted, I have two hours till it’s due :(
Answer:
The Moon spins in space in a movement called rotation. Oddly enough, it also takes the Moon about 27 days to spin around once (which is much slower than Earth's rotation, which only takes 24 hours). That means the Moon goes all the way around Earth in the same amount of time it takes to spin around just once!
PLEASE HELP WILL GIVE BRAINLIEST (I NEED TWO PICKED) PLZzZZZZ AND THxS
Answer:
A and B
Explanation:
They contain Chlorophyll
They are relatively tall
Which correctly describes have any giveaway on the electromagnetic spectrum depends on the wavelength and frequency
Answer:
c = λ f
Explanation:
In the electromagnetic spectrum, the wavelength and frequency of a specific radiation are related to the speed of the wave, which in this case the speed of light
c = λ f
where c is the speed of light, λ the wavelength and f the frequency of radiation
Anthony walks to the pizza place for lunch. He walks 1km east, and then 1 km east again. What distance did he cover? What was his displacement?
Answer:
Distance covered by Anthony is 3 km. Don't know about displacement though.
Select the correct answer from each drop-down menu.
Two magnets are placed as shown in the image.
The force of (Attraction or repulsion)
between the poles B and C is (Maximum or minimum)
And the force of (Attraction or repulsion)
between the poles A and D is (maximum or minimum)
Answer:
The force of the (attraction) between the poles B and C is (maximum) and the force of a (attraction) between the poles A and D is (minimum).
Explanation:
What happens to the electrons when the atoms are close but not touching?
Answer:
If the atoms get two close then the nuclii will repell each other.
Explanation:
Since electrons are negative they are attracted to the nucleus because it is positive. If two atoms get close enough together then the electrons of each atom will be attracted to both nuclii.
5 points
A car, of mass 1600 kg, is travelling at a speed of 20 m/s when the driver
applies the brakes. The car decelerates at a constant rate and stops. The
braking force used to stop the car and driver was 8000 N. Calculate the
braking distance of the car in m. This is a two step problem, you must
calculate a value and use it to find the final answer.
Answer:
The braking distance of the car is 40 m
Explanation:
The two steps are;
1) Calculation (finding) of the initial kinetic energy , K.E., of the car
2) Calculation (finding) of the braking distance from the calculated K.E., of the car
The initial Kinetic energy of the car, K.E. = 1/2×m×v²
Where;
m = The mass of the car = 1,600 kg
v = The velocity of the car = 20 m/s
∴ K.E. = 1/2 × 1,600 kg × (20 m/s)² = 320,000 joules
2) The work done in stopping the car, W = The braking force, 'F' × The braking distance, 'd'
∴ W = F × d
Where;
F = The braking force = 8,000 N
d = The braking distance of the car
By energy conservation principle, the work, 'W', that is required to stop the car = The initial kinetic energy of the car, K.E.
∴ W = K.E. = 320,000 joules
Therefore, by substituting the known values for the variables, we have;
320,000 J = 8,000 N × d
∴ d = 320,000 J/(8,000 N) = 40 m
The braking distance of the car, 'd' = 40 m.
1 poir
2. An upward force is applied to lift a 15 kg box to a height of 5 m at a constant speed. How
nlich work is done on the box?
500 J
65 J
150 J
735 J
Can you please help me
Answer:
D) 735 J(oules)
Explanation:
Work is defined as force * distance
Force is defined as mass * acceleration
Given a mass of 15 kg and a gravitational acceleration of 9.8 m/s² since the box is being lifted up, the force being applied to the box is 15 kg * 9.8 m/s² = 147 N
Since the distance is 5 meters, the work done is 147 N * 5 m = 735 N/m = 735 J, making D the correct answer.
Other than the resultant force acting on an object what else do you need to know to calculate the acceleration??
In addition to the resultant force acting on an object, the mass of the object should be known to find the acceleration. So, the mass is the answer.
Newton's second law of motion states that
a = F / m
Where:
a is the acceleration of the object,
The net force acting on the object is F
m is the mass of the object.
By dividing the net force (F) by the mass (m), you can determine the acceleration (a) of the object.
So, both the net force and the mass are necessary to calculate the acceleration. So, the mass is the answer.
To know more about mass:
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What is the net force on a refrigerator that you push with an applied force of 125 N to the right and the (sliding) friction between the floor and the fridge is 95 N to the left? (b) As you increase the force applied to the fridge, will the friction force also increase? Explain. Hint: remember the force of friction between solid surfaces does not depend on speed
Answer:
hola
Explanation:
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what is the electric potential difference of 5cm from a point charge of -2.0µc
Answer:
V = 360 kV
Explanation:
Given that,
Charge, q = -2µC
We need to find the electric potential difference of 5cm from a point charge.
We know that the formula for the electric potential is given by :
[tex]V=\dfrac{kq}{r}\\\\V=\dfrac{9\times 10^9\times 2\times 10^{-6}}{0.05}\\\\V=360000\ V[/tex]
or
[tex]V=360\ kV[/tex]
So, the electric potential difference is 360 kV.
A hydrogen atom has a radius of 2.5 x 10-11 m
Determine the radius of a magnesium atom.
Answer:
[tex]R = 1.5* 10^{-10}m[/tex]
Explanation:
Given
[tex]r = 2.5 * 10^{-11}m[/tex] -- radius of hydrogen atom
See attachment
Required
Determine the radius of magnesium atom (R)
From the attachment, the ratio of a hydrogen atom to a magnesium atom is:
[tex]Ratio = 6mm : 36mm[/tex]
Simplify
[tex]Ratio =1 : 6[/tex]
Represent the radius as ratio:
[tex]Ratio = r : R[/tex]
Substitute [tex]r = 2.5 * 10^{-11}m[/tex]
[tex]Ratio = 2.5 * 10^{-11}m : R[/tex]
Equate both ratios
[tex]2.5 * 10^{-11}m : R = 1 : 6[/tex]
Express as fraction
[tex]\frac{2.5 * 10^{-11}m}{R} = \frac{1}{6}[/tex]
Cross Multiply
[tex]R * 1 = 2.5 * 10^{-11}m * 6[/tex]
[tex]R * 1 = 2.5 * 6* 10^{-11}m[/tex]
[tex]R * 1 = 15* 10^{-11}m[/tex]
[tex]R = 15* 10^{-11}m[/tex]
[tex]R = 1.5*10* 10^{-11}m[/tex]
[tex]R = 1.5* 10^{1-11}m[/tex]
[tex]R = 1.5* 10^{-10}m[/tex]
Hence, the radius of the magnesium atom is: [tex]1.5* 10^{-10}m[/tex]
If a book was to fall from the shelf, how fast would it be moving just before hitting the floor?
Answer:
0 becouse it will still before falling
Explanation:
As the amplitude of a mechanical wave increases, which of the following quantities
increases?
A.wavelength
B.frequency
C.energy
D.speed
.c ...energy
Explanation:
Amplitude does not affect wavelength. It also does not affect wave speed. Amplitude is the energy of the wave measured from the rest position to the top of the crest. A wave with more energy has a higher up crest/ higher amplitude.
As the amplitude of a mechanical wave increases, the quantity which increases is: C. energy.
What is a mechanical wave?A mechanical wave can be defined as a type of wave that requires a medium for its propagation and it creates a disturbance in the medium. Thus, a good example of mechanical wave is sound wave, which is typically transported in a perpendicular direction.
What is amplitude?Amplitude refers to the maximum displacement of a wave when measured from its equilibrium position. Also, the amplitude of a mechanical wave has no effect on the following:
WavelengthSpeedFrequencyRead more on wave here: https://brainly.com/question/19250621
a car is traveling 20 m/s. it takes 4 seconds with a 7,500 n force to come to a stop. what is the mass of the car
Answer:
mass equals 375 kg
Explanation:
f=ma
f=7500
a=20
m=f/a
m=7500/20
m=375
1500 kg is the mass of the car.
What is Newton's second law of motion?Newton's second law of motion describes the relationship between an object's mass and the amount of force needed to accelerate it.
Newton's second law is often stated as,
F=ma, which means the force (F) acting on an object is equal to the mass (m) of an object times its acceleration (a).
According to the question,
Mass = 20m/s , Time = 4s , Force = 7500 N
a = Δv/Δt
a = 20m/s / 4s
a = 5 m/s²
If F = ma then,
7500 N = m x 5 m/s²
m = [tex]\frac{7500 N }{ 5m/s^{2} }[/tex]
m = 1500 kg
Therefore,
1500 kg is the mass of the car.
Learn more about Newton's second law of motion here:
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A vector has components A x = 7.6 m and A y = 15.9 m. What is the angle (in degrees that vector makes with the x-axis?
Answer:
θ = 64.5º
Explanation:
To find the angles of a vector with respect to some axis of a coordinate system, the tangent function is used.
tan θ = [tex]\frac{y}{x}[/tex]
where y is the opposite leg and x is the adjacent leg
in this case the angle is
θ = tan⁻¹ [tex]\frac{A_y}{A_x}[/tex]
let's calculate
θ = tan⁻¹ [tex]\frac{15.9}{ 7.6}[/tex]
θ = tan⁻¹ 2.09
θ = 64.5º
this angle is with respect to the positive pâté of the x axis