Two cars approach each other. How does the
speed of one car relative to the other com-
pare with speed of each car relative to the ground
ground?
Answer:
The car's fast. The ground isn't moving.
Hope this helped! :D
state the work-energy theorem
We could derive this , as ;
Consider a body of mass m being pushed by a force F acting along the horizontal , due to which it is displaced s m away . Since the angle between the force and the displacement is 0° , work done will be ,[tex]\sf \longrightarrow Work = F s cos\theta \\ [/tex]
[tex]\sf \longrightarrow Work = (ma)(s)(cos0^o)\\[/tex]
[tex]\sf \longrightarrow\pink{ Work = m \ a \ s } \dots (i)[/tex]
Now let's use the third equation of motion namely,[tex]\sf \longrightarrow 2as = v^2 -u^2[/tex]
where the symbols have their usual meaning.
[tex]\sf \longrightarrow as =\dfrac{1}{2}(v - u)^2\\ [/tex]
Multiplying both sides by m,
[tex]\sf \longrightarrow mas = \dfrac{m}{2}(v-u)^2 [/tex]
Now from equation (i),
[tex]\sf \longrightarrow Work = \underbrace{\dfrac{1}{2}mv^2-\dfrac{1}{2}mu^2} [/tex]
Above term on RHS is change in the Kinetic energy , therefore ,
[tex]\sf \longrightarrow \underline{\boxed{\bf Work = \Delta Energy_{(Kinetic)} }}[/tex]
Julian tests four springs and records the results in the table. A 3 column table with 4 rows. The first column is labeled Spring with entries W, X, Y, Z. The second column is labeled force applied in Newtons with entries 20, 60, 40, 50. The last column is labeled displacement in meters with entries 0. 5, 0. 3, 0. 4, 0. 1. Which lists the springs in order of increasing spring constant? W, Y, X, Z W, Y, Z, X Z, X, Y, W X, Z, Y, W.
The correct increasing order of the spring constant is W, Y, X, Z. Option A is correct.
What is the spring constant?
It is the measure of the stiffness of the spring, or it is the ratio of the force to the deformation of the spring.
[tex]k = \dfrac Fx[/tex]
Where,
[tex]F[/tex] - force
[tex]k[/tex] - spring constant
[tex]x[/tex] - displacement
So, the spring constant of the spring- W,
[tex]k = \dfrac {20}{ 0.5}\\\\k = 40 \rm \ N/m[/tex]
Spring X:
[tex]k = \dfrac {60}{ 0.3}\\\\k = 200 \rm \ N/m[/tex]
Spring Y:
[tex]k = \dfrac {40}{ 0.4}\\\\k = 100 \rm \ N/m[/tex]
Spring Z:
[tex]k = \dfrac {50}{ 0.1}\\\\k = 500 \rm \ N/m[/tex]
Therefore, the correct increasing order of the spring constant is W, Y, X, Z.
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Answer:
A
Explanation:
edge 2022
A model rocket with the initial mass of 3.0 KG is Lunch horizontally by burning and 640 g of fuel with the velocity of 5.1 m/s. what is the velocity of the rocket after the fuel is expelled
From the law of conservation of momentum, the velocity of the rocket after the fuel is expelled is 1.09 m/s.
What is the velocity of the rocket after the fuel is expelled?The law of conservation of momentum is employed in determining the velocity of the rocket after the fuel is expelled.
According to the law of conservation of linear momentum:
m1v1 - m2v2 = 0where;
m1 be the mass of the rocket = 3.0 kg
m2 - the mass of fuel = 640 g or 0.64 kg
v1 - velocity of the rocket after the fuel has been expelled
v2 - average velocity of expelled fuel = 5.1 m/s
making v1 subject of the equation of the conservation of momentum
v1 = v2*m2 / m1
v1 = 5.1 * 0.64/3
v1 = 1.09m/s
Therefore, the velocity of the rocket after the fuel is expelled is 1.09 m/s.
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How much kinetic energy will an electron gain if it accelerates through a potential difference of 23,000 volts in a cathode ray tube?
Answer:
3.68x10-15 J
Explanation:
I hope this is the right answer sorry if im wrong
Blake stands in a canoe in the middle of a lake. The canoe is stationary. Blake holds an anchor mass of 15 kg, then throws it west with a speed of 8 m/s. Blake and the canoe have a combined mass of 135 kg.
a. the system is defined as Blake, the canoe, and the anchor. What is the total momentum of the system before he throws the anchor?
b. what is the total momentum of the system after he throws the anchor?
c. what is the velocity of the canoe after he throws the anchor?
The velocity of the canoe is 1.7 m/s.
What is momentum?Momentum in physics is the products of mass and velocity. Now we have to find momentum with the formula; p = mv
a) Initial momentum = (15)8 m/s + 135 = 255 Kgms-1
b) Since momentum is conserved, the total momentum after throwing the anchor is still 255 Kgms-1
c) The final velocity of the boat is obtained from;
255 Kgms-1 = (15Kg + 135 Kg) v
v = 255 Kgms-1/(15Kg + 135 Kg)
v = 1.7 m/s
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what type of data can be used to make a model of food?
Answer:
Qualitative
Explanation:
Qualitative data is data that is measuring objects or anything physical with words.
Quantitative data is data that is measured using numerical factors like numbers.
So, to make a model of food you are measuring qualitative data since you're measuring types of food: ex-hamburgers, strawberries, cookies, etc.
Which theory of how the which theory of how the universe formed is best supported by evidence of radio waves detected in space?
A .big bang theory
B. big crunch theory
C. heliocentric model
D. steady state theory
Answer:
A - The Big Bang Theory
Explanation:
the radio waves are considered to be leftover from the creation of the universe and is used to determine the age of the universe
The big bang theory is the theory that explains the universe formed and is best supported by evidence of radio waves detected in space, therefore the correct answer is option A.
What is a solar system?It is a system in which the sun's gravitational attraction causes all the planets and celestial bodies to revolve around it.
The Sun is believed to be located in the system's center in the heliocentric concept upon which our Solar System is founded.
The heliocentric model is related with the positioning of the sun in our solar system , As per the heliocentric model Sun is the c entre of out solar system.
The big bang hypothesis is the best explanation for how the universe came into being, and it is best supported by evidence of radio waves found in space, hence option A is the right response.
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Which graph best represents the relationship between KE and mass?
Answer:
First graph
Explanation:
Here we need to tell which graph best represents the relationship between kinetic energy and mass . As we know that ,
[tex]\sf\red{\longrightarrow}[/tex] KE = 1/2 mv²
Here we will plot KE on y axis and mass of x axis. And it is in form of y = mx + c .On comparing the given equation with ,
[tex]\sf\red{\longrightarrow}[/tex] y = mx + c
c = 0m = 1/2v²Therefore the line will be straight and will pass through origin with a slope v²/2 .
From the attached graphs , first graph is correct .
First graph best represents the relationship between kinetic energy and mass.Answer:
its the fist graph, because it relates to kinetic energy & mass. the others are wrong becasue it is not an answr choice
Explanation:
What is the direction of the net force acting on the object at position a?.
Answer:
upward downward to the left to the right The net force is zero.
Explanation:
The velocity vectors connecting position A to the adjacent positions appear to have the same magnitude and direction. Therefore, the acceleration is zero-and so is the net force.
A cat is at rest in the branch of a tree. Identify the type of energy the cat has.
Answer:
potential energy
the cat is at reast not moving the energy inside of it could move tho
An object is dropped for reset from the top of a 100 m building . how long will it take for the object to hit the ground
Answer:
if we use gravity that is 9.8m/s then we get the answer 4.42 seconds
Explanation:
lets do it steps by steps, s=u/t +1/2 at square
100=0+1/2×9.8 time square
100=4.9 time square
100/4.9= time square
t= 10×2.21. as sides changed the signs also changed
t=4.42
Pls mark it brainliest if you like it:)
A ball has a mass of 0. 25 kg and is moving to the right at 1. 0 m/s. It hits a ball of mass 0. 15 kg that is initially at rest. After the collision, the 0. 15 kg ball moves off to the right with a velocity of 0. 75 m/s. What is the final velocity of the 0. 25 kg ball? 0. 42 m/s to the right 0. 42 m/s to the left 0. 55 m/s to the right 0. 55 m/s to the left.
The ball that starts in motion has a momentum of
(0.25 kg) (1.0 m/s) = 0.25 kg•m/s
Note that we take "to the right" to be the positive direction.
The ball that starts at rest has zero momentum.
The total momentum of the system before collision is then
0.25 kg•m/s + 0 = 0.25 kg•m/s
After the collision, the first ball continues moving to the right but has slowed down. Its final momentum is
(0.25 kg) (0.75 m/s) = 0.1875 kg•m/s
Let v be the velocity of the other ball after they collide. Then its momentum after collision would be
(0.15 kg) v
Momentum is conserved throughout the collision, so that
0.25 kg•m/s = 0.1875 kg•m/s + (0.15 kg) v
Solve for v :
0.0625 kg•m/s = (0.15 kg) v
v ≈ 0.42 m/s
Since v has positive sign, the second ball moves at 0.42 m/s to the right.
Select the correct answer. Which of the following causes air pollution inside the house? A. Smoking cigarettes B. Growing houseplants C. Opening shades to let sunlight in D. Using fans to circulate air.
Answer: Smoking cigarettes
Explanation: The other options don't cause pollution to form in the air besides smoking, from the particles it creates causing harm and damage to your lungs and fill the air with smoke particles.
Answer:
(A) smoking cigarettes
Explanation:
i got it right, please give brainiest :)
Which of the following describes a mixture? (2 points)
a Matter that is composed of a single element and has all the same physical properties
b Matter that is made of molecules of all the same type
c Two atoms chemically bonded together
d A substance made of two or more types of atoms that are not chemically bonded
Answer:
d - A substance made of two or more types of atoms that are not chemically bonded
Explanation:
i got a 100% on the quiz
You want to know if feeding rabbits corn is better for their growth than the normal feed pellets that
they eat. You have 20 rabbits on which to perform your experiment.
Independent is type of food
Dependent is the growth
Explanation:
Independent= What "I" Change: Food
Dependent= Depends on what I change:Growth
A chief finds a glittering stone which he shows to the family. The family assures him that the stone is pure gold but he doubts.Prepare a message of what you can do with the stone to give the chief and his family the advice
I will tell the Chief about the high worth of the Gold and the various
substances it can be used to produce.
What is Gold?Gold is a naturally occurring element with a bright, slightly orange yellow
color. It has a high value and can be used in the production of various
substances such as:
JewelriesMedals and awardsArts etc.The Chief should however be told about the high worth value of Gold and
the various things it can be used for so he can make a decision.
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You walk 6.7 km to the east and then 10.9 km to the west.
What is your displacement from where you started?
Answer:
4.2 km West of the start
Explanation:
Displacement is a vector quatitiy which means it has direction adn magnitude. It is the distance you are at the very end of the journey from the start.
We can assign one way as a positive direction and the other a negative and then add them
I will say that West is positive and East is negative:
(10.9) + (-6.7) = 4.2km
The solid rock of the cliff in this photograph is part of a continent. What is the relationship between the continent and Earth's plates?\. A. The continent is next to but is not part of a plate. B. The continent is on top of a layer of water that is above a plate. C. The continent is directly on top of a plate but is not part of the plate.
Answer:The continent is on top of a layer of water that is above a plateExplanation:
3. Freddie rode a horse. The
horse ran for 90 seconds at a
speed of 8.2 m/s. Calculate the
distance ran by the horse.
Answer:
Distance = 738m
Explanation:
Distance = Speed x time.
Distance = 8.2 x 90.
Hope this helps :)
Distance = time x speed
Distance = 90 seconds x 8.2 m/s
Distance = 738 meters
Astronauts in a space shuttle can float while orbiting earth. Why are these astronauts weightless?.
A gas balloon absorbs 75 J of thermal energy.
The balloon expands but stays at the same
temperature. How much work did the balloon do
in expanding?
The equations is u=Q-W
Answer:
U1 = U2 since the temperature inside the balloon does not change
Q1 - W1 = Q2 - W2
Work done by the balloon = W2 - W1 (on the environment)
W2 - W1 = Q2 - Q1 = 75 J heat put into balloon
So the balloon does 75 J on the environment
The work done in expanding the balloon is 75 J.
What is meant by internal energy ?Internal energy is the energy that is present within the system and is related to the potential energies of the molecules as a result of their orientation as well as the random motions of the particles.
Here,
The amount of thermal energy absorbed by the gas balloon, Q = 75 J
It is given that the balloon is expanding, but the temperature of the system is kept constant.
As a result, we can say that the change in internal energy,
Δu = 0
The expression for internal energy of the balloon is given as,
u = Q - W
where W is the work done.
So,
Δu = ΔQ - ΔW
0 = ΔQ - ΔW
Therefore, work done in expanding the balloon,
ΔW = ΔQ
ΔW = 75 J
Hence,
The work done in expanding the balloon is 75 J.
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Explain how weathering is occurring in A,B and C .
Answer:
physical weathering
Explanation:
when the rain rains so heavily and the top soil is washed away
which command is capable of creating connecting lines that have a rounded or sharp edge?
a.trim
b.rotate
c.hatch
d.fillet
Answer:
it is dddd
Explanation:
40 POINTS
Can someone please answer me questions 16 and 17
State the Newton's second law of motion
Answer:
It states that the time rate of change of the momentum of a body is equal in both magnitude and direction to the force imposed on it. ... The momentum of a body is equal to the product of its mass and its velocity.
Lee has a mass of 40.0 kg and ice skates with a speed of 4.6 m/s.
She collides into Mat 80.0 kg) who is standing still on the ice. They
move off together. What is their final speed in m/s
Their common speed is 1.53 m/s.
What is speed?Speed can be defined as the ratio of the distance to the time of a body in motion.
To calculate their final speed, we use the formula below.
Formula:
mu+m'u' = V(m+m')............. Equation 1Where:
m = mass of the Leem' = mass of Matu = initial speed of Leeu' = initial speed of MatV = Their common speed.make V the subject of the equation
V = (mu+m'u')/(m+m')........... Equation 2From the question,
Given:
m = 40 kgm' = 80 kgu = 4.6 m/su' = 0 m/sSubstitute these values into equation 2
V = [(40×4.6)+(80×0)]/(40+80)V = 184/120V = 1.53 m/s.Hence, Their common speed is 1.53 m/s.
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HELP PLZ!!!!!
Why do things get classified as"hot" or "cold"?
Answer:
Heat flows from higher to lower temperature. So when you keep hot things in normal temperature, the heat from hot object transfers to the environment until they are both on the same level. Same happens when a cold object is kept in normal room temperature, the heat from the environment transfers to the cold object until they are both equal. its all about achieving the equilibrium in a system
Which change increases the
electric force
between objects?
Two neutral objects are moved closer together.
® Electrons are added to two negatively charged objects.
Two oppositely charged objects are moved farther apart.
• The charge on two positively charged objects is reduced
Answer:
the answer is b
Explanation:
Answer:
The answer is B or "Electrons are added to two negatively charged objects".
Explanation:
This model shows a ball being shot from the cannon. Which of these statements accurately describes the energy of the cannonball? Select ALL that apply. A) The kinetic energy is lowest at point E. B) The potential energy is lowest at point E. C) The kinetic energy is greatest at point C. D) The potential energy is greatest at point C. E) The ball changes from kinetic to potential energy at point A.
