Answer:
Explanation:
If generator really means alternator as used in cars, the following can be said:
The rotor is fed with a variable voltage ranging from 0 volt to 12 volts. The 2 brushes (fixed, not rotating, like the stator) make contact with two rings that are rotating with the rotor. The rotor acts like a fixed magnet, but the magnetic field strength is constantly updated to provide a constant output voltage, even if the load current change or the motor speed change.
The stator is basically 3 coils and 6 diodes that convert the 3 phases of AC output to an almost ripple-free DC.
Note that as more energy is extracted from the alternator (for example, adding 10 amps by turning on the headlights) the shaft resists more rotation. This can be easily tested by holding an alternator in your hand, and trying to rotate the shaft by hand with no load (rotate easily, keep rotating for a few seconds), then short-circuiting the output (much harder to rotate, stop rotating immediately). The quest for magical perpetual energy where a motor is powered by an alternator is a child's dream.
The student notices that the electronic balance has a zero error, so it shows
mass readings that are all slightly too small.
This means that the density value is
A)incorrect and slightly too large
B)incorrect and slightly too small
C)correct because the student used three significant figures
D)correct because the mass of the block is more than zero
The student notices that the electronic balance has a zero error, so it shows mass readings that are all slightly too small. This means that the density value is incorrect and slightly too small. The correct option is B.
The density is the ratio of the mass and the volume of the object. It is denoted by ρ.
ρ = mass/Volume = m/V
The student notices that the electronic balance has a zero error, so it shows mass readings that are all slightly too small.
As mass is directly proportional to density. The density will also be slight small when mass reading are all slightly small.
Thus, the correct option is B.
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Which of the following is NOT an example of evidence that can be used to support the theory of evolution?
A. DNA evidence
B. Embryonic structures
C. Anatomical structures
D. Similar appearances in modern day organisms
A 1050 w electric toaster operates on a household circuit of 120 v. what is the resistance of the wire that makes up the heating element of the toaster
The Resistance of the wire that makes up the heating element of the toaster is 13.75Ω.
What is Resistance?
Resistance is the measure of the opposition to current flow in an electrical circuit.
S.I. Unit of resistance is ohms, symbolized by the Greek letter omega (Ω)
Also from Ohm's Law,[tex]R=\frac{V}{I}[/tex]
From power-current relation
P=VI
Also, [tex]I=\frac{P}{V}[/tex]
[tex]I = \frac{1050}{120}[/tex]
I = 8.75 A
From Ohm's Law,[tex]R=\frac{V}{I}[/tex]
[tex]R = \frac{120}{8.75}[/tex]
R = 13.75 Ω
The Resistance of the wire is 13.75 Ω
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How does newton’s third law of motion relate to a catapult?
PLEASE ANSWER ASAP. WILL GIVE BRAINLIEST
Answer: the force when the catapult swings has the same force as it does when coming down
Explanation:
for every reaction there is an equal opposite reaction
The mass of a bicyclist and a bicycle together is 53.0 kg. How much work has been
done if the bicyclist slows the bicycle from a speed of 3.84 m/s to 1.27 m/s?
(A) -68.1 J
(B) -136 J
(C) -348 J
(D) -696 J
Answer:
Approximately [tex](-348\; {\rm J})[/tex], assuming that the bike was on level ground.
Explanation:
If an object of mass [tex]m[/tex] is moving at a speed of [tex]v[/tex], the kinetic energy of that object would be [tex](1/2)\, m\, v^{2}[/tex].
At a speed of [tex]v = 3.84\; {\rm m\cdot s^{-1}}[/tex], the kinetic energy of the bike and the cyclist- combined- would be:
[tex]\begin{aligned} &\frac{1}{2}\, m\, v^{2} \\=\; &\frac{1}{2}\times 53.0\; {\rm kg} \times (3.84\; {\rm m\cdot s^{-2}})^{2} \\ \approx \; & 390.76\; {\rm J}\end{aligned}[/tex].
At a speed of [tex]v = 1.27\; {\rm m\cdot s^{-1}}[/tex], the kinetic energy of the bike and the cyclist- combined- would be:
[tex]\begin{aligned} &\frac{1}{2}\, m\, v^{2} \\=\; &\frac{1}{2}\times 53.0\; {\rm kg} \times (1.27\; {\rm m\cdot s^{-2}})^{2} \\ \approx \; &42.741 \; {\rm J}\end{aligned}[/tex].
The energy change was approximately:
[tex]390.76\; {\rm J} - 42.741\; {\rm J} \approx 348\; {\rm J}[/tex].
If the bike was on level ground, the friction on the bike and the cyclist would have done a work of [tex](-348\: {\rm J})[/tex] to reduce the kinetic energy of the bike and the cyclist by that amount.
Answer: C) -348J
Explanation:
42.741 - 390.76 (the kinetic energy of the two speeds) is equal to -348.
5.4.2 Test (CST): Earth's Resources
Question 5 of 15
▬▬
The human population grows by about 2 percent each year, showing
growth.
OA. exponential
OB. linear
OC. cubic
The human population which grows by about 2 percent each year, is showing linear growth.
What is linear increment?
A linear increment occurs when a sequence increases gradually with a constant value.
If a population increases at the rate of 2%, the incremental rate or constant factor is 2%, thus, we can conclude that the human population which grows by about 2 percent each year, is showing linear growth.
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a carmboard 4ft x 4ft Square has the queen at the centre the queen is hit by the striker moves to the front edge, rebounds and goes inta hole behind the striking line. find the magnitude of displacement of queen a) from the centre to front edge b) from the front end edge to hole (c) from centre to hole.
Diagonal of cardboard=displacement to hole
√4²+4²4√2So displacement till edge
4√2/22√2Total distance
4√2+2√26√2ftFrom centre to hole displacement
2√2(
the average power transferred to the solar panels by sunlight is 26 000 w
calculate the average energy transferred to the solar panels in 30 seconde
use the equations
energy transferred = power time
Answer:
P = E / t definition of power is energy / unit time
1 W = 1 Joule / sec definition of 1 Watt of power
E = 2.6E4 J/s * 30 s = 7.8E5 Joules = 780,000 Joules
The average power transferred to the solar panels by sunlight is 26 000 w. The average energy transferred to the solar panels in 30 seconds is 780,000 joules.
To calculate the average energy transferred to the solar panels in 30 seconds, we can use the equation:
Energy transferred = Power × Time
Given that the average power transferred to the solar panels is 26,000 watts and the time is 30 seconds, we can substitute these values into the equation:
Energy transferred = Power × Time
Energy transferred = 26,000 × 30
Energy transferred = 780,000 watt-seconds
Since the watt-second is equivalent to the joule (J), the energy transferred to the solar panels is 780,000 joules.
Therefore, the average energy transferred to the solar panels in 30 seconds is 780,000 joules.
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Which would result in a judge who is sitting beside the testing ground observing the tennis ball having a speed of 7 m/s?
Considering the frames of reference, the robot has to fire backwards at a speed of 2m/s.
What is relative velocity?The relative velocity is obtained based on the inertial frame of reference. The term velocity is always measured relatively.
Given that the inertial frame of reference is relative to the moving frame then; 7m/s - 9 m/s = -2m/s.
It then follows that the robot has to fire backwards at a speed of 2m/s.
Missing parts:
Basim’s robotics team builds a robot that travels at 9 m/s and can fire a tennis ball at a target.
Which would result in a judge who is sitting beside the testing ground observing the tennis ball having a speed of 7 m/s?
The robot fires the ball forward with a speed of 7 m/s.
The robot fires the ball backward with a speed of 7 m/s.
The robot fires the ball backward with a speed of 2 m/s.
The robot fires the ball forward with a speed of 2 m/s.
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Answer:
C. the robot fires the ball backward with a speed of 2 m/s.
4. A weightlifter lifts a set of weights a vertical distance of 2 meters. If a constant net force of 350 N is exerted on the weights, what is the net work done on the weights?
Answer:
700 J
Explanation:
Work = Force * Distance
Work = 350 N * 2 M = 700 J
Which statement belongs to daltons atomic theory
Atoms cannot be broken down into smaller pieces is the statement belongs to daltons atomic theory. Option B is correct.
What is an atom?The atom consists of matter that may be split without releasing electrical charges. It's also the smallest unit of matter with chemical element features.
The complete question is:
"Which statements belong to Dalton's atomic theory? Select all that apply.
A)Atoms cannot be created or destroyed.
B)Atoms cannot be broken down into smaller pieces.
C)All atoms of an element are identical.
D)Chemical reactions cause atoms to be rearranged."
According to Dalton's atomic hypothesis, atoms cannot be broken down into smaller bits.
Hence, option B is correct.
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Some iron has a coefficient of linear expansion of 12 x 10-6 / o K . A 100 mm length of iron piping is heated through 20 K. The pipe extends by:
Given that the linear expansion of the pipe is 12×10¯⁶ K¯¹, the pipe extends by 0.024 mm
Data obtained from the question Original length (L₁) = 100 mmChange in temperature (ΔT) = 20 KCoefficient of expansion (α) = 12×10¯⁶ K¯¹Change in length (ΔL) =?How to determine the new diameter
α = ΔL / L₁ΔT
12×10¯⁶ = ΔL / (100 × 20)
12×10¯⁶ = ΔL / 2000
Cross multiply
ΔL = 12×10¯⁶ × 2000
ΔL = 0.024 mm
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A bat strikes a 0.145 kg baseball with force of 5800 N. What acceleration does the baseball experience?
Answer:
40,000 m/s²
Explanation:
The formula is given as Force = mass × acceleration, so then acceleration = Force / mass.
Therefore...
5800 N ÷ 0.145 kg = 40,000 m/s²
A brick is kept in 2 different ways on a table as shown
below. which brick exerts more pressure? Why?
Answer:
A
Explanation:
when area increases pressure decrease
for example, a sharp nail's area is lower than a blunt nail, so sharp nail is easy to fix
so, here a exerts more pressure
Answer:
a
Explanation:
What is the most likely outcome? it will become a permanent magnet because the domains will remain aligned. it will become a temporary magnet because the domains will remain aligned. it will become a permanent magnet because the domains will easily realign. it will become a temporary magnet because the domains will easily realign.
The likely outcome when a magnetically soft material is placed in a strong magnetic field is that it will become a temporary magnet because the domains will easily realign.
What is a magnet?A magnet is a material whose magnetic domains are properly aligned. These materials are able to attract other materials that are magnetizable.
Hence, the likely outcome when a magnetically soft material is placed in a strong magnetic field is that it will become a temporary magnet because the domains will easily realign.
Missing parts:
A magnetically soft material is placed in a strong magnetic field. What is the most likely outcome?
a. It will become a permanent magnet because the domains will remain aligned.
b. It will become a temporary magnet because the domains will remain aligned.
c. It will become a permanent magnet because the domains will easily realign.
d. It will become a temporary magnet because the domains will easily realign.
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Answer: D or It will become a temporary magnet because the domains will easily realign.
Explanation: Taking the quiz!
A 950-kg car strikes a huge spring at a speed of 22m/s (fig. 11-54), compressing the spring 5.0m. (a) what is the spring stiffness constant of the spring? (b) how long is the car in contact with the spring before it bounces off in the opposite direction?
(a) The spring stiffness constant of the spring is 18,392 N/m.
(b) The time the car was in contact with the spring before it bounces off in the opposite direction is 0.23 s.
Kinetic energy of the carThe kinetic energy of the car is calculated as follows;
K.E = ¹/₂mv²
K.E = ¹/₂ x 950 x 22²
K.E = 229,900 J
Stiffness constant of the springThe stiffness constant of the spring is calculated as follows;
K.E = U = ¹/₂kx²
k = 2U/x²
k = (2 x 229,900)/(5)²
k = 18,392 N/m
Force exerted on the springF = kx
F = 18,392 x 5
F = 91,960 N
Time of impactF = mv/t
t = mv/F
t = (950 x 22)/(91960)
t = 0.23 s
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What name is given to the force on an object caused by Earth's gravitational pull?
Answer:
gravity
Explanation:
Where are heavier elements, like iron or gold made?
*
1 point
In space, between the stars
in the black holes at the centers of galaxies
In the hearts of stars
They were made as part of the big bang
Answer:
In the hearts of stars:
Theory tells us the elements heavier than iron are created by novas
that is when a star explodes, and any heavier elements were once created when a star exploded.
You suspect that the power supply in your desktop pc is failing. you want to use a multimeter to test the power supply. which multimeter setting should you use
The multimeter setting should you use is between 11-12 volts. If the voltage is too high or too low, the power supply must be changed.
What is a multimeter?An instrument made to measure resistance, voltage, and electric current, often across a range of values.
You think your desktop computer's power supply is malfunctioning. To test the power supply, you should use a multimeter.
Between 11 and 12 volts should be seen on the multimeter. The power supply is failing and has to be replaced if it's too high or too low.
Hence, the multimeter setting should you use is between 11-12 volts.
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If you had to choose a theory that best represents your own view of development, would you choose a single theory or would you select components of several different theories? what aspect of your chosen theory (or theories) make it more attractive than others
I would select components of several different theories and the aspect which will be more attractive will be the one which has similarities and accurate.
What is a Theory?This is defined as a proposed explanation for a particular phenomenon or occurrence.
Components of several different theories will bring different dimensions and factors to the occurrence which will help in its thorough analysis.
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If you had a 14 m long timeline, where would the extinction of the dinosaurs be?
Captionless Image
About 1 m from the end where the universe formed.
About in the middle.
About 3/4 of the way from where the origin of the universe was to the end representing now.
Less than one meter from the end representing now.
If you had a 14 m long timeline, the dinosaurs would be less than one meter from the end.
What is extinction of species?
The extinction of species or organisms is the process by which some environmental factors cause a decline in the number of species through death.
Dinosaurs are some of the examples of species that are in extinct.
Since dinosaurs are in extinction, If you had a 14 m long timeline, the dinosaurs would be less than one meter from the end.
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Rearrange the equation = KE
-1
2
- my? to solve for v. Show your work.
Answer:
See below
Explanation:
KE = 1/2 m v^2 multiply both sides by 2
2 (KE) = mv^2 divide both sides by m
2(KE) / m = v^2 sqrt both sides
√ [(2KE)/m ] = v
HELP!
how did Mario Molina contribute to science?
i need like a mini paragraph:(
Mario Molina helped to bring about the 1987 Montreal Protocol on substances that result in depletion of the Ozone Layer.
What is ozone layer?The topmost layer of the atmosphere which protect the harmful UV rays from the Sun to reach the Earth surface.
Mario Molina has the great contribution in science field. He tried hard and succeeded in passing an international agreement to eliminate CFCs also called as Chloro Fluoro Carbons and other ozone-depleting chemicals.
These CFCs were used in jet planes which depleted the ozone layer and a hole was observed over Antarctica.
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Which property of sound waves decreases as the square of the distance from the source increases? A. Pitch
B. Intensity C. Wavelength D. Speed
Intensity is the property of sound waves that decreases as the square of the distance from the source increases. Option B is correct.
What is a sound wave?A sound wave is produced when a medium begins to vibrate. When an entity vibrates, a pressure wave is formed, which causes sound.
As the square of the distance from the source increases, the intensity of sound waves decreases.
Sound intensity relationship
[tex]\rm {I} = \frac{1}{r^2}[/tex]
[tex]\rm \frac{I_2}{I_1} =\frac{r_1^2}{r_1^2}[/tex]
Hence, option B is correct.
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G= 10m/s
A 50kg student jumps out of a window onto a pile of mattresses.
(a) Ignoring air resistance, what is her increase in speed each second?
B) What is her change of momentum each second?
The increase in velocity of the student per second is 10 m/s^2 and her change in momentum each second is 500 kgm/s^2.
What is the change in velocity per second for any object falling freely under gravity?The change in velocity of a moving object is known as acceleration.
For any object falling freely under gravity, the change in velocity per second or acceleration due to gravity is a constant and is equal to 10 metres per square second (10 m/s^2).
The change in momentum of a body is given as follows:
Momentum = mass × velocity Change in momentum = mv - muChange in momentum = m(v - u)acceleration = v - uwhere m is mass, v is final velocity and u is final velocity.
Mass of the student = 50 Kg
Change in momentum each second = 50 kg × 10 m/s^2 = 500 kgm/s^2
Therefore, the increase in velocity of the student per second is 10 m/s^2 and her change in momentum each second is 500 kgm/s^2.
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A satellite with a mass of 120 kg fires its rocket thrusters, which give an impulse of 7440 kg-m/s. What was the total change in the velocity of the satellite — that is, what was the total AV?
A. 17 m/s
B. 88 m/s
C. 45 m/s
D. 62 m/s
From the calculation and the momentum of the body, the velocity is 62 m/s
What is momentum?The term momentum refers to the product of mass and velocity. Now recall that the rate of change of momentum is equal to the impressed force.
Hence;
7440 kg-m/s = 120 kg * v
v= 7440 kg-m/s/120 kg
v = 62 m/s
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Pls answer, i need help :(
Answer: B
Explanation: AN increase in heat out
Which option is an example of an object that has potential energy followed by an object that has kinetic energy?
A ball held over a person's head | a ball rolling on the floor is an example of an object that has potential energy followed by an object that has kinetic energy.
What is Kinetic energy?This is the type of energy possessed by a body by virtue of its motion or movement.
The rolling ball therefore has kinetic energy while a ball being held over a person's head has potential energy which is the energy possessed by a body by virtue of its position.
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when two bodies of diffrent temprature in contact, heat will
Answer:
When two bodies at different temperatures are placed in thermal contact with each other, heat flows from the body at a higher temperature until they both reach the same temperature.
Explanation:
Which form of energy is converted to electrical energy in a voltaic cell?.
Answer:
chemical energy is converted to electrical energy in a voltaic cell.