Answer:
If there is a system of magnets being held in place, there is potential energy. When you let go, the potential energy converts to kinetic energy and the magnets move. Putting the system of magnets close together which creates an opposing force.
Explanation:
Magnets cause objects to have kinetic energy by the magnetic force present in the magnet.
Magnets is a material which has a strong magnetic field which attracts ferromagnetic substances such as nickle, iron etc.
When a ferromagnetic objects put near the magnet, the magnet attracts the object and causes the movement towards its direction.
Therefore, magnets cause objects to have kinetic energy by the magnetic force present in the magnet.
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Why are force fields necessary to describe electric force? 0 A. Electric force acts at a distance. O B. Electric force can only attract objects. C. Electric force is a form of gravity. D. Electric force attracts two poles.
Answer:
A. Electric force acts at a distance.
Explanation:
"Electric force," just like gravitational force is a "non-contact force." This means that even at a distance, two objects with no physical contact will create movement with the help of electric force. This leads to the concept of "force fields or field force" that explains why a charge object alters the region surrounding it. Once an object enters the region, it immediately experiences its force. An example of this is holding out one's hand near a "Van de Graaff generator." The electric force compels the hair strands to stand up.
The bottom of a ladder must be placed 4 feet from a wall. The ladder is 12 feet long. How far above the ground does the ladder touch the wall? Estimate your answer to the nearest tenth.
Answer:
Height of wall (Perpendicular) = 11.31 ft (Approx)
Explanation:
Given:
Base Distance (Base) = 4 feet
Height of ladder (Hypotenuse) = 12 feet
Find:
Height of wall (Perpendicular)
Computation:
Perpendicular = √Hypotenuse² - Base²
Height of wall (Perpendicular) = √12² - 4²
Height of wall (Perpendicular) = √144 - 16
Height of wall (Perpendicular) = √128
Height of wall (Perpendicular) = 11.31 ft (Approx)
List these things in order of size, starting with the smallest thing:
Universe, Earth, Galaxy, Moon, Solar System, Sun
please please help me please help me please help me please help me please help me please help me please help me please help me please help me
Explanation:
cookies
HOPE IT HELPS U....
(b) The cabin and passengers have a total mass of 800 kg. The vertical distance between
B and C is 50 m.
Calculate the increase of gravitational potential energy of the cabin and passengers when they
move from B to C.
energy =
Answer:
392 kJ
Explanation:
Given that,
The total mass of the cabin and the passengers = 800 kg
The vertical distance between B and C is 50 m.
We need to find the increase of gravitational potential energy of the cabin and passengers when they move from B to C. It can be given by the relation as follows :
[tex]E=mgh\\\\E=800\times 9.8\times 50\\\\E=392000\ J\\\\\text{or}\\\\E=392\ kJ[/tex]
So, the increase in gravitational potential energy is 392 kJ.
a sprinter starts from rest and accelerates at a rate of 0.16 ms ^-2 over a distance of 50.0 meters . How fast is the athlete traveling at the end of the 50.0 meters?
Answer:
Final velocity v = 4 m/s
Explanation:
Given:
Initial velocity u = 0 m/s
Acceleration a = 0.16 m/s²
Distance s = 50 m
Find:
Final velocity v
Computation:
Using; v² = u² + 2as
v² = (0)² + 2(0.16)(50)
v² = 16 m/s
v = 4 m/s
Final velocity v = 4 m/s
What happens to objects in space when they no longer have force accelerating them?
Answer:An object thrown in space will move according to the forces on it in space. For instance, if you threw it in space near the Earth, it would accelerate due to the Earth's gravity. ... If there are no forces on the object, then it will move at a constant speed and direction.
Explanation:
PLEASE SOMEONE HELP!!! ANSWER IF YOU KNOW PLEASE!!! LOTS OF POINTS!!!
Answer:
i think that magnet can cause kinetic because
it is made of iron or steel that attract other magnetic things
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1. A heat engine has a cold reservoir that is 285 degrees Kelvin which accepts 370 J of heat, and a hot reservoir that is 371 degrees Kelvin which gives off 425 J of heat. Calculate the maximum and actual efficiencies of this engine.
2. A system that has a total change in entropy of 675 J/K and has received 243 J of heat energy will be at what temperature?
3. Assume that the above system maintains a constant pressure, and increases in volume by 2.5 m 3 while doing this work. What is the pressure of the system?
I can't help with this one.
The maximum efficiency of the heat engine is 23%.
The actual efficiency of the heat engine is 13%.
The temperature of the system is 273.36 ⁰C.
The pressure of the system is 607.5 Pa.
The given parameters:
Cold reservoir temperature, Tc = 285 KHeat, qc = 370 JHot reservoir temperature, Th = 371 KHeat of the hot reservoir, qh = 425 JThe maximum efficiency of the heat engine is calculated as follows;
[tex]\eta = 1- \frac{T_c}{T_h} \\\\ \eta = 1 - \frac{285}{371} \\\\ \eta = 0.23\\\\ \eta = 23 \ \%[/tex]
The actual efficiency of the heat engine is calculated as follows;
[tex]\eta = 1 - \frac{q_c}{q_h} \\\\ \eta = 1 - \frac{370}{425} \\\\ \eta = 0.13\\\\ \eta = 13\ \%[/tex]
The temperature of the system is calculated as follows;
[tex]\Delta S = \frac{\Delta H}{T} \\\\ T = \frac{\Delta H}{\Delta S}\\\\ T = \frac{243}{675} \\\\ T = 0.36 \ K\\\\ T = 273.36 \ ^0C[/tex]
The pressure of the system is calculated as follows;
[tex]W = P \Delta V\\\\ P = \frac{W}{\Delta V} \\\\ P = \frac{243}{2.5} \\\\ P = 607.5 \ Pa[/tex]
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What is the magnetosphere, and how does it help the earth?
can someone plss help me???
What is the magnetosphere, and how does it help the earth?
The magnetosphere shields our home planet from solar and cosmic particle radiation, as well as erosion of the atmosphere by the solar wind - the constant flow of charged particles streaming off the sun. ... It is generated by the convective motion of charged, molten iron, far below the surface in Earth's outer core.
Explanation:
I’ll give brainliest and 10 points
Answer:
what's these its D okkkk
A badminton player hits a 0.010 kg shuttlecock that is initially at rest in his hand. The net force on the shuitlecock over time is shown below. What is the shuttlecock's speed at t = 30ms ?
Answer: 10 m/s
Explanation: I got the answer wrong, then it showed it to me
Which of the following employees derives their income from a fee for the items sold?
a commission
b. piece rate
c.salaried
d. tip
Please select the best answer from the choices provided
Answer:
i think its b because i learned this before if im wrong sorry it could be a or d
Explanation:
Billy is driving a bumper car for 5 minutes. In this time, Billy crashes into three other cars.
The first car is carrying another small child, the second is carrying a large adult, and the third is empty. Each car is sitting still when Billy hits it at full speed. Place the crashes in order of how much force Billy feels, from smallest to largest.
empty car
large adult
small child
<
Answer:Its empty car, small child, and then adult.
Explanation:
i took it
Answer:
Its empty car, small child, and then adult.
what is the velocity at 11 seconds
Answer:
should be A
Explanation:
there isn't a 3, so it must be his deceleration, which would be 5-3=2
please help!!! 50 POINTS
1) The diagram below models the energy involved in a reaction that changes methane gas and oxygen into carbon dioxide and water.
The graph shows a certain level of energy of reactants C H2 + 2 O2, which increases on the breaking of bonds as the atoms are separated. The energy is then consumed when the making of bonds decreases the energy of products, C O2 + 2 H2 O, to a level much lower than the energy of reactants. The energy change of negative delta H depicts the exothermic reaction.
Which observations about the energy released in making the bonds are correct?
a) It is greater than the energy absorbed in breaking the bonds. The excess is converted to chemical energy.
b) It is greater than the energy absorbed in breaking the bonds. The excess is converted to thermal energy.
c) It is less than the energy absorbed in breaking the bonds. The excess is converted to thermal energy.
d) It is less than the energy absorbed in breaking the bonds. The excess is converted to chemical energy.
2) Carbon dioxide is an example of a molecule where the component atoms of carbon and oxygen are held together by chemical bonds. Which statement correctly describes the reason for these chemical bonds?
a) The nuclei and electrons of the atoms are attracted to each other.
b) The strong nuclear energy bonds the atoms together.
c) The combination of chemical energy stored in each atom makes the bonds strong.
d) The structure of atoms increases their atomic energy, which creates the bonds.
3) When burning fuel for cooking, the pan and the food absorb energy and heat up. In this process, which form of energy is chemical energy converted into?(1 point)
a) thermal energy
b) atomic energy
c) mechanical energy
d) radiant energy
4) Which of the following statement/s about the energy involved in a chemical reaction is/are correct?
I. The energy stored in chemical bonds is kinetic energy.
II. The total energy is conserved during a chemical reaction.
III. Chemical energy can be converted to other forms of energy.
IV. Energy is needed to both break bonds and form new bonds.
a) III and IV only
b) II and III only
c) II, III, and IV only
d) I only
5) Burning coal results in several energy transformations to generate electricity. Which statement is correct about the chemical energy stored in chemical bonds between atoms when coal is burned?
a) It allows the bonds to form and then break.
b) It helps transform kinetic energy to potential energy.
c) It increases the number of atoms.
d) It converts to thermal energy.
thank you!!
Answer:
Explanation:
1. It is greater than the energy absorbed in breaking the bonds. The excess is converted to thermal energy.
2. The nuclei and electrons of the atoms are attracted to each other
3. thermal energy
4. II and III only
5. It converts to thermal energy.
3.5 x 10^-3 as a regular number (convert from scientific notation to a real number)
Answer: 0.0035
============================================
Explanation:
The exponent is -3, so we move the decimal point 3 spots to the left to go from 3.5 to 0.0035
If the exponent was positive, then we would move the decimal point to the right that amount of spaces.
what is an amplitude??
Answer:
maximum extent of a vibration or oscillation measured from the position of equilibrium.
Answer:
the maximum displacement or distance moved by a point on a vibratng body or wave measured from its equilibrium position. it is equal to one-half lenght of the vibration path.
Explanation:
hope it helps
Calculate the momentum of a boat with a mass of 95kg moving at 2m/Ss
Answer:
190 kg m/s
Explanation:
Momentum = Velocity × Mass
→ Substitute in values
2 × 95 = 190 kg m/s
The momentum of the boat of mass 95 Kg moving at 2 m/s will be 190 Kg m/s.
What is Momentum?Momentum is defined as the product of mass of velocity. Momentum is a vector quantity. Mathematically, we can write momentum as -
p = mv
It is also the measure of the impact force imparted by any moving object, when it comes in contact with some other body.
Given is a boat with a mass of 95 Kg moving at 2 m/s.
Mass [m] = 95 Kg
Velocity [v] = 2m/s
We can write the momentum as -
p = mv
Substituting values, we get -
Momentum [p] = 95 x 2 = 190 Kg m/s
p = 190 Kg m/s
Therefore, the momentum of the boat of mass 95 Kg moving at 2 m/s will be 190 Kg m/s.
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A car accelerates northwest from 35 to 62 m/s in a time of 14 seconds. What is the acceleration?
a = Vf - Vi / t
A) 27 m/s2 northwest
B) 1.9 m/s2 northwest
C) -1.9 m/s2 northwest
D) 61 m/s
Answer:
B) 1.9 m/s2 northwest
Explanation:
Given parameters:
Initial velocity = vi = 35m/s
Final velocity = vf = 62m/s
Time = 14s
Unknown:
Acceleration = ?
Solution:
Acceleration is the rate of change of velocity with time.
Acceleration = [tex]\frac{Vf - Vi}{t}[/tex]
Vf is the final velocity
Vi is the initial velocity
t is the time taken
Acceleration = [tex]\frac{62 - 35}{14}[/tex] = 1.93m/s² northwest
What are 3 main ways to improve the Cardiovascular system???
Worth 100 points
A 2.5 –g bullet traveling at 350 m/s hits a tree and slows uniformly to a stop while penetrating a distance of 12 cm into the tree’s trunk. What force was exerted on the bullet in bringing it to rest?
Answer:
A 2.5 g bullet traveling at 350 m/s hits a tree and slows uniformly to a stop while penetrating a distance of 12 cm into the tree's trunk. What is the initial kinetic energy of the bullet? 153.125 J Correct: Your answer is correct.Jan 8, 2020
Explanation:
The variable plotted on the horizontal or x-axis is called the
Answer:
Independent Variable
Explanation:
The variables that are plotted on X-axis, the horizontal line of the graph are termed as independent variables. The variables plotted on Y-axis which is vertical side of the graph are dependent variables.
What is the downward pull on an object due to gravity?
mass
weight
acceleration
velocity
Answer:
Weight
Explanation:
WEIGHT - downward pull to the center of earth due to gravity
ACCELERATION - the rate of change of velocity
VELOCITY - rate of change if displacement in time
The major difference between the mass and weight is that mass of an object can never be zero but weight can be zero. The downward pull on an object due to gravity is called the weight. The correct option is B.
What is weight?The measure of the force of gravity acting on a body is defined as the weight. Actually weight is a force and its SI unit is Newton (N). The weight of an object depends on the mass and acceleration due to gravity.
The formula used to calculate the weight is:
w = mg
m = Mass of an object
g = Acceleration due to gravity
Weight is found to be a vector quantity. Because it has both magnitude and direction. It is directed towards the center of the earth or other gravity well.
When objects fall to the ground, it is the gravity which accelerates them. So the force of gravity which pulls the object downward is called the weight.
Thus the correct option is B.
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The total amount of carbon dioxide in the atmosphere is estimated to have decreased by 10 to 15 percent since 1900.
True False
Answer: False
Explanation:
FILL IN THE BLANKS here on earth, the pull of gravity on a mass of 1 kg is ......... newtons
Answer:
9.8 Newton
Explanation:
At average gravity on earth (conventionally, g=9.80665m/s2),
a kilogram mass exerts a force of about 9.8 newton
I hope this answer helps you
Make a prediction that answers the question in the purpose:
“How does time affect the temperature of water?”
(Ex-“If we use a ramp, then the ball will roll faster down the ramp because gravity has more time to do work on the ball.”)
Im not good at these, please help quickly.
From where does the penny that is launched into the air get its energy
Which is characteristic of uneven growth during late childhood?
a. fast growth of hands and feet
b. increase in hip width
c. widening of the shoulders
d. lengthening of the torso
Answer:
B
Explanation:
The others are natural growth developments
The electromagnetic spectrum has waves of varying levels of energy. Which
wave has the least energy?
Answer:
Radio waves, I believe
Explanation:
Answer:
radio yes yup yup yup yup