Answer:
Joule or kilowatt/hour
1d. Conservation of energy is demonstrated in this roller coaster example.
The Conservation of Energy is a principle which states that energy cannot be created
or destroyed, but can be altered from one form to another
Friction plays a significant role in the efficiency of the rollercoaster cars. Explain how, even
with friction, the law of conservation of energy still holds true. (2 points)
Answer:
According to the principle of the Conservation of Energy, energy can neither be destroyed or created, energy can be transformed from form to another
The forms of energy the car has at the different stages is given by virtue of either the position of the car, which is the car's potential energy, or the speed of the car, which gives the potential energy of the car
However, due to the frictional forces acting on the car, there is a frictional force which requires work to be done for the car to move between points in the roller coaster
Therefore, based on the Conservation of Energy principle, we have;
The total energy of the roller coaster, M.E. = m·g·[tex]h_{max}[/tex]
Where;
m = The mass of the roller coaster = 4,500 kg
g = The acceleration due to gravity ≈ 9.81 m/s²
[tex]h_{max}[/tex] = The maximum height = 30 m
Therefore, M.E.[tex]_A[/tex] = 4,500 × 9.81 × 30 = 1,324,350 J
The energy at point B, [tex]M.E._B[/tex] = 4,500×15×9.81 + (1/2) ×4,500×17.15² = 1,323,950.625
The energy at point B, [tex]M.E._B[/tex] = 1,323,950.625 J
At point C, the total energy, [tex]M.E._C[/tex] = (1/2)·m·v²
Where;
v = The velocity of the roller coaster at point c = 24.25 m/s
Therefore;
[tex]M.E._C[/tex] = (1/2) × 4,500 × 24.25² = 1,323,140.625
At point C, the total energy, [tex]M.E._C[/tex] = 1,323,140.625 J
Therefore, given that the energy at point A, M.E.[tex]_A[/tex] is larger than the energy at point B, [tex]M.E._B[/tex], is larger than the energy at point C, [tex]M.E._C[/tex], the loss in energy can be explained by the presence of the friction which require energy for movement of the roller coaster between the points
Explanation:
An average 1.50 V Alkaline AA battery has 9,360 J of stored energy. If the battery is placed in a toy that requires 2.00 amperes of current to operate, how many minutes will the battery last before it runs out of energy?
Answer:
52 minutes
Explanation:
Given the following data;
Voltage = 1.5 V
Current = 2 Amperes
Energy = 9360 J
To find how many minutes will the battery last before it runs out of energy;
First of all, we would determine the power rating of the toy
Power = current * time
Power = 2 * 1.5
Power = 3 Watts
Next, we find the time;
Energy = power * time
9360 = 3 * time
Time = 9360/3
Time = 3120 seconds
To convert to minutes;
60 seconds = 1 minute
3120 seconds = 3120/60 = 52 minutes
The distance between an object and a reference point is the object's what?
Answer:
Displacement
Explanation:
The distance between an object and a certain reference point is called displacement. This is not to be confused with distance, which represents the total distance the object has travelled to get a certain point, regardless of how long it is. Displacement always represents the shortest distance (a straight line) between the initial and final points.
Answer:
Displacement is the distance and direction of an object's change in position from a reference point. Suppose a runner jogs to the 50-m mark and then turns around and runs back to the 20-m mark.
The drop in potential across a resistor in a circuit is 40 V. What is the current
flowing through the resistor if the resistance is 2.0 0? (use Ohmis law. V = IR
Answer:
Current, I = 20 Amperes.
Explanation:
Given the following data;
Voltage = 40 V
Resistance = 2 Ohms
To find current flowing through the resistor;
Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.
Mathematically, Ohm's law is given by the formula;
[tex] V = IR[/tex]
Where;
V represents voltage measured in voltage.
I represents current measured in amperes.
R represents resistance measured in ohms.
Making current (I) the subject of formula, we have;
[tex] I = \frac {V}{R} [/tex]
Substituting into the formula, we have;
[tex] I = \frac {40}{2} [/tex]
Current, I = 20 Amperes.
how can professional education improve life of people?
Answer:
Professional education as a science has been defined as a field of educational science that studies the growth of a person into a profession and the related problems. It refers to organized education aimed at the knowledge and skills needed in the profession and working life, as well as growing into active citizenship and membership of society. Professional education as a discipline studies vocational training, skills and learning related to the profession and working life.
It enables young people and adults to pursue goal-oriented learning with the aim of acquiring and developing the necessary skills in the profession and creating the conditions for independent professional activity and continuous development in the profession.
A 2kg mass and a 4kg mass on a horizontal frictionless surface are connected by a massless string A. They are pulled horizontally across the surface by a second string B with a constant acceleration of 12 m/s^2. What is the magnitude of the force of string B on the 2kg mass?
Answer:
72 N
Explanation:
Applying,
F = (m'+m)a..................... Equation 1
Where F = Force, m' = First mass, m = second mass, a = acceleration.
From the question,
m' = 2 kg, m = 4 kg, a = 12 m/s²
Substitute these values into equation 1
F = 12(2+4)
F = 12×6
F = 72 N
Una persona pesa 700 N al nivel del mar. ¿Cuándo sube a un avión a
10000 m de altura pesará más, igual o menos? Bien explicado por favor
Answer:
The weight of the person decreases.
Explanation:
Weight of person at sea level = 700 N
height = 10000m
We know that the weight is given by product of mass and the acceleration due to gravity.
The acceleration due to gravity at height is given by
[tex]g' =g\times \left ( \frac{R}{R+h} \right )^2[/tex]
Where, R is the radius of earth and h is the height.
Now, as we go on heights , the acceleration due to gravity decreases, so the weight also decreases as we go on heights.
Uas partículas com cargas = +1,0 e = +2,0 estão posicionadas conforme indica a figura. Determine o módulo do campo eléctrico resultante no ponto P, em N/C.
An object is fired from the ground at 100. m/s at an angle of 30° with the horizontal.
a) Calculate the horizontal and vertical components of the initial velocity
b) After 2.0 seconds, how far has the object traveled in the horizontal direction?
c) How high is the object at this point
Answer:
a. V_y = 50m/s and V_x = 86.6m/s
b. d_x = 173.2m
c. d_y = 80.38m
Explanation:
V_x = 100m/s*cos(30°)
V_x = 86.6m/s
V_y = 100m/s*sin(30°)
V_y = 50m/s
D_x = v_x*t
d_x = 86.6m/s*2s
d_x = 173.2m
v_f = 50m/s+(-9.81m/s²)*2s
v_f = 30.38m/s
d_y = .5*(30.38m/s+50m/s)*2s
d_y = 80.38m
When you heat water on a stove, how does its energy change?
Answer:
tthe body of what it is supplied in its temperature rises
which of the following is not made up of atoms answers choices A heat b tree c balloon
Answer:
the answer is tree
Explanation:
because tree is made up of woodly barks and not atoms so we can say that tree is the answer. u may wander, why not hear or baloon cause heat is a gas state which is made up of atom and baloon contains gall like helium which is also made up of atom.
hope this helps u
which one of the following statements is not correct about galvanometer?
A) it is used to measure small amount of current.
B) it has infinity resistance.
C) it can be used to measure voltage if shunted with large load in series.
D) its working principle is the same as that of the electric motor.
Answer:
B
Explanation:
galvanometer has a small resistance ....
I dont know whether the answer is right...
I pull a wagon with a 30 kg child in it with a FORCE of 2000 N. The handle makes a 60 degree angle with the horizon. If I pull the child for a distance of 0.75 miles (1 mile = 1600 m), how much work did I do?
Answer:
1200000 J
Explanation:
Applying,
W = Fdcos∅....................... Equation 1
Where W = Workdone, F = Force applied to pull the wagon, d = distance, ∅ = angle with the horizontal.
From the question,
Given: F = 2000 N, d = 0.75 miles = (0.75×1600) = 1200 m, ∅ = 60°
Substitute these values into equation 1
W = 2000×1200×cos60°
W = 2000×1200×0.5
W = 1200000 J
Hence the work done in pulling the wagon is 1200000 J
What is the gravitational potential energy of a 3.0-kg rock that is 12.4 m above the ground?
Answer:
Explanation:
PE = mgh where m is mass, g is the pull of gravity, and h is the height to which the object can possibly fall.
PE = 3.0(-9.8)(-12.4) so
PE = 360 J, rounded to the correct number of sig figs.
The gravitational potential energy of the rock is 362.4 joules.
What is gravitational potential energy?The gravitational potential energy of an object is given by the formula:
PE = mgh
where PE is the potential energy, m is the mass of the object, g is the acceleration due to gravity (which is approximately 9.81 m/s^2 near the surface of the Earth), and h is the height of the object above a reference point.
In this case, the mass of the rock is 3.0 kg, the height above the ground is 12.4 m, and the acceleration due to gravity is 9.81 m/s^2. Substituting these values into the formula, we get:
PE = (3.0 kg) x (9.81 m/s^2) x (12.4 m) = 362.4 J
Therefore, the gravitational potential energy of the rock is 362.4 joules.
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A man ran a 5 mile race. The race looped around a city park and back
to the starting line. What is the man's total displacement?
A. 0 miles
B. 2.5 miles
C. 5 miles
D. 10 miles
Answer:
How big the city because it could be a big all city
Please help me do this problem
Answer:
i) acceleration from B to D is 0, because the velocity is constant (stays the same)
ii) whatever units of distathat might be, we can calculate the number:
for 4 time-steps (2 to 6) the velocity is 6 per time step, that makes 24 distance units in these 4 time steps. it's the same the area underneath the graph.
there is also the vertical line from 0 to 2. we can calculate that distance like the area of a triangle with 2*6 / 2 = 6
the total distance from 0 to D is therefore 30
What are three methods of water conservation that we can do to protect our aquifers, watersheds, and ground water?
Answer:
• Go Native. Use native plants in your landscape. ...
• Reduce Chemical Use. Use fewer chemicals around your home and yard, and make sure to dispose of them properly - don't dump them on the ground!
• Manage Waste. ...
Explanation:
There are some easy ways to conserve water to help protect our aquifers, watersheds, and ground water. First, we can all conserve water, by not running the water while we brush our teeth and making sure we fix all leaking or dripping faucets. Another was to conserve water is to collect rain water to use to water your plants. Speaking of plants, you can also plant more zeroscape type landscapes that require less water. We can also update our shower heads and toilets to be low-flow and more efficient. Can't afford a new toilet? Simply add a brick to your tank and this will cut down on the water used for every flush.
CAN SOMEONE PLS HELP ME ILL GIVE YOU BRAINLIEST
A 7000 N braking force is used to slow a car down. The car was traveling at 25 m/s before the
brakes were applied and was traveling at 5 m/s after 6 seconds. What is the mass of the car?
what is parking orbit?
Answer:
A temporary orbit in which a spacecraft awaits the next phase of its mission .
3) A bird flies toward a tree limb at a 45-degree angle to the ground along a path that is 50 m long landing on the limb. Determine, in m, how high above the ground the bird is perched.
Answer:
35 m
Explanation:
Given :
The distance of the path from the ground to the tree limb = 50 m
The angle between the path of flight of the bird towards the tree limb and the ground = 45 degrees
Therefore we can determine the height above which the bird perched above the ground by using the rules of the trigonometric ratios as;
We know that ,
[tex]$\sin 45^\circ =\frac{\text{perpendicular}}{\text{hypothenus}}$[/tex]
[tex]$\sin 45^\circ =\frac{\text{BC}}{\text{AC}}$[/tex]
[tex]$0.7 =\frac{\text{BC}}{\text{50}}$[/tex]
[tex]\text{BC }= 0.7 \times 50[/tex]
= 35
Therefore, the bird perched on the tree limb at a height of 35 m.
what can make an inclined plane more efficient?
Answer:
Efficiency can be increase by using rollers in conjunction with the inclined plane. Wedge. The wedge is an adaptation of the inclined plane. It can be used to raise a heavy load over a short distance or to split a log
which material has more specific heat?
Answer:
SO
Explanation:
SI
Answer:
Explanation:
dynamic equilibrium
what happen when I put a coloured ice cube in warm water
Answer:
it would melt with the hot weather
Explanation:
It melts and the water changes color
Which of the following careers would physicists be least qualified to perform,
based on their training?
A. Nuclear engineer
B. Research lab manager
C. Solar panel designer
D. Gardener
SUBMIT
Which type of reaction is modeled by this chemical equation?
2Li + CaCl2 → 2LiCl + Ca
O A. Single-replacement
O B. Combustion
O C. Synthesis
O D. Double-replacement
The correct answer is Option (A) Single replacement.
What is Single replacement Reaction?
The reaction substituted to the other element is called single replacement reaction.The general equation is A+BX-----> AX+B.Why other options are incorrect?(B) Combustion is a type of chemical reaction in which a compound and an oxidant is reacted to produce heat and a new product.
(C) Synthesis is the production of chemical compounds by reaction from simpler materials.
(D)A double replacement reaction is a type of chemical reaction where two reactants exchange ions to form two new products with the same type of chemical bonds.
Hence Other options are incorrect and (A) is the correct one
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Answer: single replacement
Explanation:
Una niña tira de un carrito por medio de una soga. Si realiza una fuerza de 10 N qué forma un ángulo de 30° con la dirección de desplazamiento. ¿Qué trabajo hace al desplazar 300cm?
Answer:
El trabajo realizado por la niña es 25.9 J.
Explanation:
El trabajo ue hace la niña viene dado por:
[tex] W = |F|*|d|*cos(\theta) [/tex]
En donde:
F: es la fuerza realizada = 10 N
d: es el desplazamiento = 300 cm
θ: es el ángulo entre la fuerza y el desplazamiento = 30°
Entonces, el trabajo es:
[tex] W = |F|*|d|*cos(\theta) = 10 N*3 m*cos(30) = 25.9 J [/tex]
Por lo tanto, el trabajo realizado por la niña es 25.9 J.
Espero que te sea de utilidad!
a man runs 1200m on a straight line in 4 min . find his velocity.
Answer:
5m/sec^2
Explanation:
Distance=1200m
Time=4 min
1=60sec
4=4 x 60
=240sec
Velocity=Distance/Time
Velocity=1200/240
Velocity=5m/sec^2
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Si se aplic una fuerza de 150N en un área de de 0.4m2¿cual será la preciosa ejercida?
Answer:
P = 375 Pa
Explanation:
The question says that,"If a force of 150N was applied in an area of 0.4m², what will be the precious exerted?"
We have,
Force, F = 150 N
Area, A = 0.4m²
We need to find the pressure exerted. We know that,
Pressure = forece/area
So,
[tex]P=\dfrac{150\ N}{0.4\ m^2}\\\\P=375\ Pa[/tex]
So, the required pressure is equal to 375 pa.
state the mode by which heat travels from the cube to the balloons
Answer:
The face of the cube towards A. is bright and shiny and the face towards B is dull black. State with reason the adjustments that should be made on the distances X1 and X2 so that the rate of change of temperature in both balloons is the same.
Explanation:
Convection is the mechanism by which heat is transferred from the cube to the balloon. Convection is the movement of currents inside a liquid or gas that transfers heat energy.
What is Convection?Convection is a method of heat transfer in which a fluid or gas, such as air or water, is moved. A hotter liquid or gas loses density and rises, while a colder, denser liquid or gas replaces it by sinking. Convection is the term used to describe the movement of gases or liquids due to temperature differences.
When the cube is heated, the air around it becomes less dense and rises; On the contrary, the cold air from all around fills the space. As a result, heat energy is transferred from the cube to the balloons via convection currents.
Therefore, Convection is the mechanism by which heat is transferred from the cube to the balloon. Convection is the movement of currents inside a liquid or gas that transfers heat energy.
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The metal wire in an incandescent lightbulb glows when the lights is switch on and stops glowing when switched off. This simple process is which kind of a change?
Answer:
When the metal wire in an incandescent lightbulb glows when the light is switched on and stops glowing when it is switched off, this is an example of resistance, which provides light and heat.
Explanation:
Opening or closing a circuit.
