Given that,
Electrical energy of the motor = 2280 J
Kinetic energy = 1606 J
Wasted energy in thermal and sound energy = 550 J
To find,
The efficiency of the motor in percent.
Solution,
Efficiency is defined as the ratio of useful output energy to the total energy.
Total energy = 2280 J
Useful energy = 1606 J
[tex]\eta=\dfrac{1606}{2280}\times 100\\\\=70.43\%[/tex]
So, the efficiency of the motor is 70.43%.
How would gravity cause planets to move if they did not have inertia?
A. Planets would orbit Jupiter, the largest planet
B. Planets would run into one another
C. Planets would be pulled into the sun
D. Planets would move in a straight line away from the sun
Answer: Planets would be pulled into the sun
Explanation:
This is the correct answer.
Someone please help.
Q. A body of mass 10kg falling freely in the gravitational field close to the moon's surface has an acceleration of 1.6 m/s.
what is the gravitational field strength on the moon?
A. 0 N/kg
B. 1.6 N/kg
C. 10 N/kg
D.16 N/kg
Answer:
B is the answer
Explanation:
A car changes its speed by 2 meters per second each second. What is its acceleration?
A. 4 m/s2
B. 0.5 m/s2
C. 2 m/s2
Answer:
2 m/s²
Explanation:
If changes speed by 2 meters per second each second means:
2 m/s²
Because it changes constantly it veloctity.
Remember the aceleration changes the velocity.
Answer:
c. 2 m/s2
is the right answer.
HELP NEEDED
1. What change in Earth's atmosphere allowed life to form?
a
Solar radiation split molecules
b
A meteor strike
c
The formation of the oceans
d
The development of an ozone layer
Answer:
D the development of an ozone layer
Explanation:
the rest don't relate to the atmosphere
Find the velocity of a truck traveling north 50 meters in 20 seconds. Question 2 options: 2.5 m/s 1 m/s North 10 m/s North 2.5 m/s North
Answer:
2.5 m/s North
Explanation:
Took the quiz on K12 it was right
An uncharged, nonconducting, hollow sphere of radius 10.0cm surrounds a 10.0-μC charge located at the origin of a Cartesian coordinate system. A drill with a radius of 1.00mm is aligned along the z axis, and a hole is drilled in the sphere. Calculate the electric flux through the hole.
The electric flux through the hole is [tex]56.45\ webber[/tex] .
Electric flux is the number of electric field lines cutting through the surface and is measured as surface intregal of electric field over that surfaceMathematically it is given by [tex]\phi_E=E.A \ Nm^2/C[/tex] where E is the electric field and A is the area. Gauss's law states that electric flux through closed surface is equal to the 1 / ε₀ times the charge enclosed by that surface which is given by Ф = q / ε₀ where q is the central charge and ε₀ is the permittivity of the medium.It is given , hollow sphere of radius 10.0cm surrounds a 10.0-μC charge.
The whole surface of hollow sphere [tex]= 4\pi r^2[/tex]
[tex]= 4\times 3.14\times (10 \times 10^{-2})^2 \\\\= 12.56\times 10^{-2} m^2[/tex]
Area of the hole ( both side ) [tex]= 2\times \pi r^2[/tex]
[tex]= 2\times 3.14 \times (10^-^3)^2\\= 6.28 \times 10^-^6 m^2[/tex]
According to Gauss's theorem, the flow from a particular charge in the center is given by
[tex]\phi= \frac{10\times10^-^6}{8.85\times 10^-^1^2}\\\\\phi=1.13\times10^6[/tex]
This flux flows through the surface of the sphere, so the flux per unit area which is given by
[tex]= \frac{ 1.13\times 10^6 }{ 12.56\times 10^-^2} \\\\= 8.99 \times 10^6 \ weber / m^2[/tex]
Flux through area of hole is given by :
[tex]= 8.99\times10^6 \times6.28 \times 10^-^6\\ = 56.45 \ weber[/tex]
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Identify the forces on the same cart at rest
Answer:
you can go to quizlet
Explanation:
At t=0 s, a bunny is hopping along at 1.0 m/s. It continues at that speed, until at t=10 s, when the bunny begins to slow down with a constant acceleration. It comes to a complete stop at t=12 s. What is the bunny’s displacement at t=12 s? What is the bunny’s acceleration when slowing down?
The bunny’s displacement at t=12 s is 12 m.
The bunny’s acceleration when slowing down is -0.083 m/s².
What is displacement?The displacement of an object is the change in position of the object.
The displacement of the object at time, t = 12 seconds, is the change in position from time, t = 0 seconds to time, t = 12 seconds.
Δx = v(t₂ - t₁)
Δx = 1 m/s (12 s - 0 s)
Δx = 12 m
Bunny’s acceleration when slowing downThe bunny’s acceleration when slowing down is calculated as follows;
a = (v - u)/(t₂ - t₁)
a = (0 - 1 m/s) / (12 s - 0 s)
a = -0.083 m/s²
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Answer:
The bunny’s displacement at t=12 s is 12 m.
The bunny’s acceleration when slowing down is -0.083 m/s².
Does the phenomenon of wave interference apply only to sinusoidal waves?
No , the phenomenon of wave interference apply to all form of the wave.
Superposition theorem - If quite one supply acts at the same time in an electrical circuit, then this through anyone of the branches of the circuit is that the summation of currents which might flow through that branch for every supply acting alone, keeping all the opposite sources deadWave interference is that the development that happens once 2 waves meet whereas traveling on constant medium. The interference of waves causes the medium to require on a form that results from cyberspace result of the 2 individual waves upon the particles of the medium.No , waves with alternative wave forms are trains of disturbance that add along once waves from totally different sources move through constant medium at constant time.
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Which of these jobs is MOST likely to be open to someone with an associate’s degree (in other words, a two-year college degree)?
A.
computer support specialist
B.
database administrator
C.
operations research analyst
D.
business information manager
The charge per unit length on a long, straight filament is -90.0μC/m . Find the electric field (c) 100cm from the filament, where distances are measured perpendicular to the length of the filament.
The electric field for 100 cm is 1.62 MN/C
Length of the straight filament = (100cm) (1m/100cm) = 1m
Electric field for the straight conductor = [tex]E = \frac{2k_{e} \lambda}{r}[/tex]
E = [2(8.99 × 10^9 N·m^2/C^2)(90.0 × 10^-6 C/m)] / 1 m
E = 1.62 MN/C
The electric field is directed radially inward, toward the filament.
The electric field is a force produced by a charge near its surroundings. This force is exerted on other charges when brought in the vicinity of this field. SI unit of the electric field is N/C (Force/Charge).
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At night the sand cools off...
Conduction
Convection
Or radiation
Answer:
I feel like it's Convection because if its dry , then the water comes over it and it warms it also the sun gives it light it's gonna be more warmer. So I think your answer will be Convection.
Explanation:
Because conduction is Anything being warmed by objects touching.
And radiation is Anything being warmed by heat transferring through space.
And the meaning of Convection is Anything being warmed in WATER.
I hope this is right and I hope this will help you in any way!! <3
Please help me djhrhtjskakjdh
Answer:d
Explanation:
Neha and Suhani are playing with two identical pendulums. They leave the bob from a certain position and wait for it to return to the same point. The one who waits for a shorter time wins. Neha leaves her pendulum from point L and Suhani leaves her pendulum from point P (see figure). What happens?
a. Neha wins as her bob comes back faster.
b. Suhani wins as her bob comes back faster.
c. No one wins as the bobs come back at the same time.
d. We cannot say any of the above for sure.
Answer:
The correct option is C
Explanation:
The pendulum bob would return at the same time because the initial angle a pendulum bob is dropped does not affect it's period (the time it takes for the pendulum to move back and forth), however the one with a larger angle move faster but would eventually arrive at the same "starting point" due to varying displacements made.
c. No one wins as the bobs come back at the same time.
The pendulum bob would return at the same time because the initial angle a pendulum bob is dropped does not affect it's period (the time it takes for the pendulum to move back and forth), however the one with a larger angle move faster but would eventually arrive at the same "starting point" due to varying displacements made.The longer the length of string, the farther the pendulum falls; and therefore, the longer the period, or back and forth swing of the pendulum. The greater the amplitude, or angle, the farther the pendulum falls; and therefore, the longer the period.)Learn more:
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What are three key processes that alter the surface of an object and make it show less cratering?
The three key processes that alter the surface of an object and make it show less cratering. The size and shape of the crater and the amount of fabric excavated rely upon elements such as the speed and mass of the impacting frame and the geology of the floor. The faster the incoming impactor, the bigger the crater.
An effect crater is formed whilst an item like an asteroid or meteorite crashes into the floor of a larger solid item like a planet or a moon. The excavation of bowl-formed depressions via asteroids or comets putting a planet's surface.
Crater diameter is proportional to the mass and velocity of the impactor. based totally on the kinetic electricity equation, kinetic power=1/2mv^2, speed increases have a greater impact on a crater diameter than mass will increase when you consider that pace is squared.
The scale of the impact crater relies upon such factors as the size and velocity of the impacting item and the attitude at which it strikes the floor of the Earth. Meteorite flux is the full mass of extraterrestrial items that strike the Earth.
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In a reverse fault, the fault part that lies below the other part is called the _____.
A. syncline
B. shear wall
C. footwall
D. hanging wall
PLZ HELP!
Answer:
D
Explanation:
which mixture is most likely to be homogeneous?
We can't tell what they're pouring glue on, but I would go for B since homogenous means of the same, and none of them are mixing things that are the same.
in order to qualify for the finals in a racing event, a race car must achieve an average speed of 250 km/h on a track with a total length of 1600 m.
In order to qualify for the finals in a racing event the race car wit an average speed of 250 km/h on a track with a total length of 1600 m must finish the track in a time of: 23.04 seg
The formula and procedure we will use to solve this exercise is:
t = x/v
Where:
x = distancet = timev = velocityInformation about the problem:
v =250 km/hx=1600 mt = ?By converting the distance units from (m) to (km) we have:
x=1600 m * 1 km/1000 m
x = 1.6 km
Applying the time formula we have that:
t = x/v
t = 1.6 km / 250 km/h
t = 6.4 *10^-3 h
By converting the time units from (h) to (seg) we have:
t = 6.4 *10^-3 h * 3600 seg/1 h
t= 23.04 seg
What is velocity?It is a physical quantity that indicates the displacement of a mobile per unit of time, it is expressed in units of distance per time, for example (miles/h, km/h).
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please help me I promise will mark u brainest
Answer:
Point A
Explanation:
There are 3 states of equilibrium, which are as follows:
1. Stable Equilibrium
2. Unstable Equilibrium
3. Neutral Equilibrium
1. Stable Equilibrium:
A body is said to be in stable equilibrium, if it comes back to its original position, when it is slightly displaced. In this case the center of mass of the body is raised up as compared to the initial position.
Example: A book lying on a table, a map hanging on the wall, a stone suspended by a spring.
2. Unstable Equilibrium:
A body is said to be in unstable equilibrium if it does not come back to its original position when it is slightly displaced. In this case the center of mass of the body is lowered, as compared to the initial position.
Example: A vertical standing pencil, a stick balanced on finger, a funnel resting on its pointed end.
3. Neutral Equilibrium:
A body is said to be in neutral equilibrium, if on being slightly displaced it does not come back to its original position but occupies a new position similar to its original position. In this case the center of mass of the body remains at same height.
Example: A spherical ball on floor, a cone resting in horizontal position.
So, it is clear from the figure that when we will remove displacement the bus will come back to its original position. Therefore, this is the case of stable equilibrium.
So, the center of mass must have raised up. The original center of mass of the bus must be in the center. So, now the center of mass should have moved above center of bus, vertically.
Therefore, the center of mass of the bus is at point A
Mr. Krabs created a secret ingredient for breath mint that he thinks will "cure" the bad breath people
get from eating crabby patties at the Krusty Krab. He asked 100 customers with a history of bad breath
to try his new breath mint. He had fifty customers (Group A) eat a breath mint after they finished
eating a crabby patty. The other fifty (Group B) also received a breath mint after they finished the
sandwich, however, it was just a regular breath mint and did not have the secret ingredient. Both
breath mint that would cure their bad breath. Two hours
groups were told that they were getting the
after eating the crabby patties, thirty customers in Group A and ten customers in Group B reported
having better breath than they normally had after eating crabby patties.
2. What is the independent variable?
3. What is the dependent variable?
4. What should Mr. Krabs' conclusion be?
5. Why do you think 10 people in group B reported fresher breath?
The answers to the following questions are 1. Group B, 2. secret ingredient, 3. bad breath, 4. not effective cent percent, 5. the placebo effect.
1. The group of people who received the normal mint which does not contain Mr. krab's secret ingredient for breath mint is the control group. So, Group B of people are in the control group.
2. Independent variable in the one for which the research is being conducted. So in this case the secret ingredient in the breath mint is the independent variable.
3. Dependent variable is the one that affects the result of the research. So, the bad breath, in this case, is the dependernt variable.
4. The Group A of fifty people received the secret ingredient in breath mint; 30 people it reported better breath. Therefore the mint that has a secret ingredient is successful in reducing the amount of bad breaths in the individual but does not appear to be effective cent percent.
5. The 10 people in group B may have reported fresher breath due to the 'placebo' effect. It is the effect where the physical or mental health of the individual appears to improve after a fake, dummy, or sample treatment is given to him/her.
Therefore, 1. Group B, 2. secret ingredient, 3. bad breath, 4. not effective cent percent, 5. the placebo effect.
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An airplane flies with constant velocity.
Which claim about the forces acting on the airplane must be true?
Answer: True
Explanation:
Answer:
There is no net force on the airplane.
Explanation:
correct answer for khan
i have to find the sound waves and it doesn’t really give any clear instructions. help?
Explanation:
#31 = crest
#32 = Trough
#33 = Wavelength
#34 = Amplitude
-TheUnknownScientist
Answer:
vaat hachi upar vada ni.
a 15-g block of aluminum has a volume of 5.5 cm. what is the density
Answer: 2.72727272......g/cm3^
Explanation:
D = g/cm^3
soo d = 15/5.5
A 15-g block of aluminum has a volume of 5.5 cm. Its density will be 2.73 kg / [tex]cm^{3}[/tex]
What is Density ?Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume. Density is defined as the ratio of mass of the object to the volume of the object. Different substances have different densities.
The mathematical expression for density is as follows: Density=Mass * Volume. The mass of a substance is expressed in kilograms and the volume is expressed in liter.
Density is an important concept because it allows us to determine what substances will float and what substances will sink when placed in a liquid. Generally, substances float so long as their density is less than the density of the liquid they are placed in.
Density Symbol: ρ
Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.
Density = mass / volume
mass = 15 kg
volume = 5.5 [tex]cm^{3}[/tex]
density = 15 / 5.5 = 2.73 kg / [tex]cm^{3}[/tex]
A 15-g block of aluminum has a volume of 5.5 cm. Its density will be 2.73 kg / [tex]cm^{3}[/tex]
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imagine a square column of the atmosphere, 10 m on a side, that extends all the way to the top of the atmosphere.
The calculated weight in newtons is 10 N.
Listed below is the data we will use:
Area A is where the pressure is P. Here are the details we were given:
A=1 cm2, P=101325 N/m, and w=?
Do the area conversion to square meters.
A=1cm2×1m2/1002cm2\s=1×10−4m2
From the definition of pressure, calculate the weight of the air column. In this instance, the air column's weight is determined by multiplying the atmospheric pressure by the air column's base area.
Fw = P atm A
= (101325N/m2) (1 10 4m2)
= 10N
The complete question is - Imagine a square column of the atmosphere, 1 cm on a side, that extends all the way to the top of the atmosphere. How much does this column of air weigh in newtons?
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In this circuit, energy is transferred from a battery to a circuit wire and then to a light bulb, where some of it leaves the system. Starting from the battery, which series shows the correct order of energy transformations taking place in this circuit?
Answer: The correct order of energy transformation is from CHEMICAL ENERGY to ELECTRICAL ENERGY to LIGHT ENERGY
Explanation:
Energy which is simply defined as the ability to perform work is made up of different forms, these include:
- Mechanical energy: Associated with machines at work.
- LIGHT ENERGY: produced by light bulbs
- ELECTRICAL ENERGY: taking in by television set and other electrical appliances.
- CHEMICAL ENERGY: stores in food and other fuels
- Sound energy: Produced by vibrating objects example piano, drums.
According to the law of conservation of energy, energy can neither be created nor destroyed in a closed system, but can be transformed from one form to another, thereby keeping the energy in the closed system constant. From the question, the circuit is an example of a closed system and the order of energy transformation taking place is from the battery (CHEMICAL ENERGY) to ELECTRICAL ENERGY(power source) to LIGHT ENERGY(bulb). I hope this helps, thanks.
Given that:
= 2i + 9j ; and ⃗ = -i – 4j . Find . ⃗
Answer:
A.B = -38
Explanation:
A = 2i + 9j and B = -i - 4j.
So, A.B = (2i + 9j).(-i - 4j)
= 2i.(-i) + 2i.(-4j) + 9j.(-i) + 9j.(-4j)
= -2i.i - 8i.j - 9j.i - 36j.j
since i.i = 1, j.j = 1, i.j = 0 and j.i = 0, we have
A.B = -2(1) - 8(0) - 9(0) - 36(1)
A.B = -2 - 0 - 0 - 36
A.B = -38
Please I need HELP WITH THIS QUESTION!!!
Question: List 3 common lubricants.
Its 7th Grade science Ill mark Brainlist!!!
what is the answer?
"Choice-C" is the answer.
Enzo throws a rock horizontally with a speed of 12 m/s from a bridge. It falls for 2.28 s before reaching the
water below with no appreciable air resistance. Just as the rock reaches the water, find
(a) the horizontal component of its velocity.
(b) the speed with which it is moving
(a) The horizontal component of its velocity is 12 m/s.
(b) The speed with which the block is moving at the end of the given time is 25.36 m/s.
What is horizontal component of velocity?The horizontal component of velocity is the velocity of a projectile directed along x - axis or x direction of the projectile path.
The horizontal component of a velocity is not affected by gravity since the velocity is directed along horizontal path.
This causes the horizontal component of velocity to be constant. That is the initial horizontal velocity is equal to the final horizontal velocity.
Since the rock is thrown horizontally, the horizontal component of its velocity will be constant and equal to 12 m/s.
The final speed of the block at end of the 2.28 s will due to change in vertical velocity.
The final vertical velocity of the block is calculated as follows;
v = u + gt
where;
u is the initial vertical velocity = 0v is the final vertical velocity after 2.28 secondsg is acceleration due to gravityt is timev = 0 + gt
v = gt
v = (9.8)(2.28)
v = 22.34 m/s
The resultant final speed if calculated as follows;
v = √(Vx² + Vy²)
where;
Vx is the final horizontal velocity = 12 m/sVy is the final vertical velocity = 22.34 m/sv = √(12² + 22.34²)
v = 25.36 m/s
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What do you observe when you switch on your light source
When a light source is turned on, it emits photons that scatter in different directions and hit every object that is present around it.
What is a Circuit?
This is referred to as the path in which electric current can flow around and comprises of some components such as resistors, bulb etc. There are two types which include open and closed circuit.
When the light source is turned on, the circuit is closed and there is complete flow of electrons which powers up the bulb and gives rise to the emission of the photons which hits objects around it thereby giving rise to the illumination of the area.
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