Answer:
49000J
Explanation:
Given parameters:
Height = 25m
Mass = 200kg
Unknown:
Kinetic energy of the cart at the bottom of the hill = ?
Solution:
The kinetic energy of the roller coaster at the bottom of the hill will be at its maximum and the potential energy is 0.
All the potential energy would have been converted to kinetic energy in essence.
So find the potential energy first;
Potential energy = mgh
m is the mass
g is the acceleration due to gravity
h is the height
Potential energy = 200 x 9.8 x 25 = 49000J
So the kinetic energy at the bottom of the hill is 49000J
Each statement explains why coal and oil produce more pollution than solar power except:
Coal and oil are mined causing to destroy ecosystems.
Coal and oil produce more toxic pollutants in the air when used.
Coal and oil have greater damage if spilled in the environment.
Coal and oil pollutants can be avoided if not used.
Answer:
Coal and oil are mined causing to destroy ecosystems.
Explanation:
it doesn't make sense
energy exists in different forms. which of the following forms of energy is stored in food
Answer:
The answer is chemical energy, so that would be D
Explanation:
1. Spring force is proportional to stretch distance, F=kd. Do you expect doubling the stretch distance double the force?
Yes
No
Answer:
Yes
Explanation:
The spring force is given as:
F = kd
F is the spring force
K is the spring constant
d is the magnitude of the stretch
Since k is a constant, therefore, doubling the stretch distance will double the force.
Both stretch distance and force applied can be said to be directly proportional to one another.
Answer:
Yes!
Explanation:
The coefficient of kinetic friction between an object and the surface upon which it is sliding is 0.6. The
mass of the object is 12 kg. What is the force of friction
Answer:
[tex]F_s^{k} = 70.56 \ N[/tex]
General Formulas and Concepts:
Physics 1 - Newton's Law of Motion
Gravity: 9.8 m/s²Static/Kinetic Friction Formula: [tex]F_s^k = F_n \cdot U_k[/tex]Free Body DiagramExplanation:
Step 1: Define Variables
[tex]Mass = 12 \ kg[/tex]
[tex]U_k = 0.6[/tex]
Step 2: Find Normal Force
See Attachment for FBD.
Substitute: Fg = (12 kg)(9.8 m/s²)Multiply: Fg = 117.6 NRedefine: Fn = 117.6 NStep 3: Find Kinetic Friction
Substitute: Fs = (117.6 N)(0.6)Multiply: Fs = 70.56 NAnswer:
70.56 N
Explanation:
The formula for kinetic friction is fₖ = μₖ * n, where μₖ is the coefficient of kinetic friction and n is the normal force.
The question gives us the value of the coefficient of kinetic friction, but it does not explicitly give us the normal force.
Let's draw a free-body diagram to see the forces that are acting on the object. I attached an image of what the free-body diagram should look like.
We can see that there are three forces being applied to the object: the normal force, weight force, and the (kinetic) friction force.
Since the object has a net force of 0 in the y-direction (it is not moving vertically), we can use Newton's 2nd Law to prove that the normal force and the weight force are equal to each other.
Newton's 2nd Law of Motion tells us that F = ma, so we can apply it in this instance by saying the sum of all forces in the y-direction is equal to 0, since there is no acceleration in the vertical direction.
∑F_y = 0 ∑F_y = n - w = 0The two forces acting on the object in the y-direction must subtract to become 0 since the net force must be 0.
Therefore, by adding w to both sides of the equation, we get:
∑F_y = n = wWe know that n = w, so by solving for the weight force we can find the normal force.
The weight force w can also be written as mg, where m = mass (kg) and g = 9.8 m/s² (acceleration due to gravity).
We are given the mass of the object, so we can plug it into mg to solve for the weight force.
w = mg = (12 kg)(9.8 m/s²) w = 117.6 NThe weight force is equal to 117.6 N, and since the normal force is equal to the weight force, we can say that the normal force is also equal to 117.6 N.
Now that we have the normal force, we can plug it into the formula for the force of kinetic friction:
fₖ = μₖ * n fₖ = (0.6) * (117.6) fₖ = 70.56 NThe force of kinetic friction between the object and the surface is 70.56 N.
FBD:
Is it healthy to be sad all the time?
1.sometimes
2. no
3.yes
Answer:
my answer would be NO. it is not healthy
Answer:
2. No.
Explanation:
Absolutely not, think of one time being sad has ever helped you in a situation. The only thing sadness has ever done is make you not want to go anywhere, constantly eat, and stay in your bed.
If you're sad all the time, that could mean depression, and bottling up your depression could eventually lead to some form of hurting yourself, or someone you love, it may even lead to your death.
Whatever's making you sad, you need to address the situation and not bottle it up. Squash it once and for all so you can experience joy again, do not let a situation you're able to control make you want to lose your life.
Which of these games was a racing game?
A.
Centipede
B.
Pole Position
C.
Xevious
D.
Galaxian
E.
Space Invaders
Answer:
B.
pole position
(vector)Two tugs are towing a small ship. The tugs pull with forces of 600 N and 800 N respectively and there is an angle of 45 degrees between the two ropes. What is the magnitude and direction of the resultant force provided by the two tugs?
Answer:
566.73 N and 78.7°
Explanation:
I've attached a diagram to show the forces and angle as indicated in the question.
From the free body diagram, we can see that the resultant force is labeled as C.
Using law of cosine, we can find C.
Thus:
C² = a² + b² - 2(ab)cos θ
C = √(a² + b² - 2(ab)cos θ)
C = √(600² + 800² - 2(600 × 800)(cos 45))
C = √(360000 + 640000 - (960000 × 0.7071))
C = 566.73 N
Direction will be gotten by using sine rule:
800/sin b = 566.73/sin 44
sin b = (800sin 44)/566.73
sin b = 0.9806
b = sin^(-1) 0.9806
b = 78.7°
How does the electric force between two charged particles change if the
distance between them is reduced by a factor of 2?
A. It is reduced by a factor of 2.
B. It is increased by a factor of 4.
C. It is increased by a factor of 2.
D. It is reduced by a factor of 4.
Answer:
increased by a factor of 4
Explanation:
1. How far will a car travel in 3 seconds at 20 m/s?
a. 30 m
b. 60 m
c. 10 m
d. 120 m
Answer:
60m
Explanation:
SInce we know S=d/t, plug in known values and solve
20m/s=d/3s
20m/s*3s=d
d=60m
Which of these is an example of mechanical energy being converted to sound energy?
baking cookies in the oven
playing a guitar
alarm clock
Answer:
Playing Guitar
Explanation:
When yout pluck or strum that mechanical energy then the action of plucked and strumming will be converted to sound energy hence will produce the soothing music heard when a guitar is played
Question 1 of 25
A bookcase has a mass of 37 kg. What is the weight of the bookcase?
Help please
answers
81.6 pounds rounded or just 81.571 if it needs to be exact
If an object is moving at a constant velocity, it means that?
What is the momentum of a baseball with a mass of 2 kg being thrown at a velocity of 85 m/s towards the hitter?
Answer:
170 kg.m/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocity
From the question we have
momentum = 2 × 85
We have the final answer as
170 kg.m/sHope this helps you
Which of the following units are the Standard International units for
displacement?
A. Meters (m)
B. Meters per Second (m/s)
C.Meters per Second Squared (m/s2)
D. Seconds per Meter (s/m)
A compressed spring stores 720 J of energy. A 1 kg block rests on the end of the spring. The spring is released and comes back to its uncompressed length pushing the block away. What is kinetic energy of the block as it leaves the spring? What is the speed of the block at this instant?
Answer:
the kinetic energy of block will be equal to energy stored in spring ie 720 J
the speed of block will be 37.9 m/s
Explanation:
E = m v^2 / 2
v = sqrt (2 * E / m)
v = sqrt (2 * 720 J / 1 kg) = 37.9 m/s
Answer this please ASAP!!
110 is the answer to the question
Answer:
dont run away
Explanation:
I need to match the term with the definition
Please don't put a random answer
Answer:
A, B, C, D
Explanation:
Yes, i know it is abcd, but it is correct
Answer:
average speed - b
speed - d
acceleration- c
Instantaneous speed- a
Explanation:
I think I dont really remember
Electromagnetic waves are sometimes demonstrated by rippling waves in water. However, electromagnetic waves are different from water waves. Which is a
characteristic that makes electromagnetic waves and water waves different?
O A. All water waves have higher frequencies.
OB. All water waves have longer wavelengths.
OC. All electromagnetic waves are transverse waves.
O D. All electromagnetic waves can travel in a vacuum.
This equation shows the reaction that occurs when charcoal burns. What type
of reaction is it?
Explanation:
Exothermic
Because here Energy is released.
Answer:
c
Explanation:
Kudzu vines grow by climbing and wrapping around trees. Trees covered by kudzu can die because they are starved of sunlight.What type of relationship exists between the trees and the kudzu growing on them?
Answer:
Parasitism
Explanation:
Parasitism is one of the types of symbiotic relationships that can exist between two organisms coexisting. In this relationship, one organism survives to the detriment of the other organism. Thus, one organism benefits while the other surfers.
From the given question, the kudzu vines obstructs the tree on which it grows from sunlight, thus leading to the death of the tree. The relationship that exists between the kudzu vines and the tree on which it grows is parasitism.
Once started, why can nuclear fission continue to occur on its own?
a) The thermal energy released can cause the products to join.
b) The neutron formed by the reaction can cause more nuclei to combine.
c) The thermal energy released can cause the products to split.
d) A neutron begins the reaction, and more neutrons are formed in it.
Answer:
C. The thermal energy released can cause the products to split.
Explanation:
Because this is fission its bleeding off the atom.
A neutron begins the reaction and more neutrons are formed in it ( D )
When a nuclear fission is started it will continue to occur on its own because Nuclear fission is a form of reaction that starts with the splitting of the neutron of an atom into smaller nuclei which will continue to split into much smaller nuclei infinitely ( i.e. Chain reaction )
Hence we can say that once a Nuclear fission is started it can continue to occur on its own because A neutron begins the reaction and more neutrons are formed in it ( i.e. chain reaction )
learn more : https://brainly.com/question/6166290
What does the REVOLUTION of Earth around the Sun bring us and how long does it take?
Answer:
takes 365 days and it bring us seasons such as, spring,winter and fall.
The water cycle is an example of a * 2 points A) matter being cycled in a closed system B) an open system because water can come in from outside Earth's closed system C) energy being cycled in an opened system D) matter being cycled in an open system
is the text in red correct (0n0')
7. How do Newton’s laws of motion explain why it is important to keep the ice smooth on a hockey rink so that players can pass a puck as quickly as possible? *
Which is true of the greenhouse effect?
A. It is purely a manmade phenomenon.
B. it does not involve carbon dioxide.
C. It causes cooling of Earth's atmosphere.
C. it traps thermal energy from the Sun.
Answer:
c is correct option thanks to brainly
How much power is used if a machine does 28 J of work in 7 seconds?
Show Work!!!
Answer:
p = 4 watts
Explanation:
power = workdone / time
power = 28 / 7
power = 4 watts
Power is used if a machine does 28 J of work in 7 seconds is 4 watts.
What is work?Work in physics is the energy that is transferred to or from an item when a force is applied along a displacement. In its simplest form, it equals the product of the force's magnitude and the distance traveled for a constant force directed in the direction of motion.
power = workdone / time
power = 28 / 7
power = 4 watts
Power is used if a machine does 28 J of work in 7 seconds is 4 watts.
To learn more about work refer to the link:
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#SPJ2
Gina made a poster for plastic recycling week and included this information on her poster:
A 2-column table with 3 rows. The first column labeled natural has entries cellulose, rubber tires, D N A. The second column labeled synthetic has entries plastic, starch, nylon.
What corrections should Gina make? Check all that apply.Gina should put “cellulose” under “Synthetic.”
Gina should put “plastic” under “Natural.”
Gina should put “rubber tires” under “Synthetic.”
Gina should put “starch” under “Natural.”
Gina should put “DNA” under “Synthetic.”
Gina should put “nylon” under “Natural.”
Answer:
Gina should put “rubber tires” under “Synthetic.”
Gina should put “starch” under “Natural.”
Explanation:
Answer:
C) Gina should put rubber tires under “Synthetic.”
D) Gina should put starch under “Natural.”
Explanation:
I'm late :(
A liquid has a density of 0.85 g/cm. If you pour some of the liquid into a glass of water, will the liquid float?
Explain how you know
PLEASE HURRY
Answer:
Yes, it will float.
Explanation:
It is given that,
A liquid has a density of 0.85 g/cm³.
We know that, the density of water is 1 g/cm³.
The density of the liquid is less than that of water. If the density of the liquid is less than that of water, it will float in it. Hence, if you pour some of the liquid into a glass of water, it will float.
What is a force field
A force field is simply a vector field that describes a non-contact force acting on a particle at various positions in space.
Discussion:
By definition, When a body exerts an influence into the space around itself, we say that the body creates a " field " around itself.
Examples of such forces are:
Electric forceGravitational forceMagnetic force and so on.Read more on force fields:
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