Answer:
3 m/s^2
Explanation:
Simply F = ma
15 = 5 a
a = 3 m/s^2
How many Watts of power does a model rocket engine have if it does 66 J of work on a model rocket in 0.9 seconds?
Power developed by a model rocket engine will be 73.3 watts. Power is the ratio of the work done or the enrgy to the time period.
What is the power output?The rate of the work done is called the power output. It is denoted by P.Its unit of a watt.
The given data in the problem is;
E is the energy = 66 J
P is the power output =?
t is the time period = 0.9 sec
The power output is given as;
[tex]\rm P = \frac{E}{t} \\\\ \rm P = \frac{66}{0.9} \\\\ \rm P = 73.3 \ watt[/tex]
Hence power developed by a model rocket engine will be 73.3 watts.
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#SPJ1
What holds the moon in place, orbiting around earth?
Answer:
Gravity
Explanation:
An inductor produces a back emf in a dc series rl circuit when a switch connecting the battery to the circuit is closed. We can explain this by.
Hi there!
Let's say that a series RL circuit is constructed, with the switch left open.
When the switch is closed, a current will start flowing in the circuit. The INCREASING current will go through the loops of the inductor, producing an INCREASING magnetic field and consequentially a magnetic flux through the inductor. (Use hand rules).
However, the inductor does NOT want to experience this increasing magnetic flux, so an emf in the OPPOSITE direction of the current will be produced to counteract the increasing flux. (The flux would also be in the opposite direction).
This is expressed with the equation:
[tex]\epsilon = -L \frac{di}{dt}[/tex]
ε = Back emf (V)
L = Inductance (H)
i = Current (A)
t = time (s)
With the negative sign, we can see that if the current of the circuit is INCREASING, the emf produced would be in the opposite direction.
Copper (II) chloride reacts with magnesium nitride
Answer:
I don't know
Explanation:
because I'm not smart
Find the ( mass m ) when system is equilibrium help me pleasee this choice is
1. 4 kg
2. 6.25 kg
3. 10 kg
4. 12.5 kg
5. 25 kg
please show solution
Answer:
5. 25 [kg].
Explanation:
1) the final ratio is:
m_20kg *g=m*g/cos37°; ⇒ m= m_20kg / cos37°;
2) answer is:
m=20/0.8=25 [kg].
1) anything that has mass and takes up space is called
A. Tissues
B. Mass
C. Matter
D. Atomic number
E. Weight
2) mechanical energy is
A. Found in machinery only
B. Usually measured at the atomic level
C. The sum of the chemical and thermal energy of an object
D. The sum of the kinetic and potential energy of an object
( please answer it guys i really bad at my physics TnT))
[tex]\qquad \qquad \huge \pink {\sf{☁Answer☁}} \\ \\ [/tex]
Anything that has mass and takes up space is :-[tex]\pink{\boxed{\sf{↪Option.c↩}}}[/tex]
→Matter✓
mechanical energy is[tex]\pink{\boxed{\sf{↪Option.d↩}}}[/tex]
→The sum of the kinetic and potential energy of an object✓
___________________☃️[tex]\sf{\:мѕнαcкεя\: ♪...}[/tex]
Fluorescence occurs when an object absorbs ____________________ and immediately releases the energy as visible light.
Answer:
The answer should be light or other electromagnetic radiation
Explanation:
Such as x-rays or other things like that.
-Hope This Helps!
-Justin:)
Please help me with the blanks
Answer:
wavelength and frequency
Explanation:
wavelength is the distance between waves while frequency is the number of times in which the wave occurs.
The diagram shows the water levels inside the containers.
A)91 cm
B) 34 cm ( the water levels)
•) The density of water is 1000 kg/m²
ii) Calculate the pressure that the water causes at the base of container A.
Answer:
8927.1 Pa
Explanation:
pressure = height x density of liquid x g
= (91/100) x 1000 x 9.81
= 8927.1 Pa
1. 50 W and 100 W lamps are designed for the same voltage. Which lamp has the higher filament resistance and why?
2. At a voltage of 4 V, 300 mA flows through the bulb. What is the work done by the electric current in 5 min?
3. The label on the lamp says 100 W, 220 V. Calculate the resistance of the lamp?
4. What is the work done by the motor of a floor polisher in 25 min with a voltage of 220 V, a current rating of 1,25 A and a motor efficiency of 80%?
help
Answer:
Look below.
Explanation:
1.) The resistance of a light bulb filament is effected by both length and cross-sectional area. Thicker wires have less resistance. A 120-Watt bulb has a greater current and a smaller resistance. Thus, a 120-Watt bulb must have a thicker filament than a 60-Watt bulb (assuming the lengths of the filaments are identical). We also think of lightbulbs in terms of their power ratings in watts. Let us compare a 25-W bulb with a 60-W bulb. Since both operate on the same voltage, the 60-W bulb must draw more current to have a greater power rating. Thus the 60-W bulb’s resistance must be lower than that of a 25-W bulb. If we increase voltage, we also increase power. For example, when a 25-W bulb that is designed to operate on 120 V is connected to 240 V, it briefly glows very brightly and then burns out. Precisely how are voltage, current, and resistance related to electric power?
2.) Energy transferred = 120 × 2 = 240 J. This equation can be rearranged to V = E ÷ Q. So voltage is energy transferred divided by charge.
3.) Power= Voltage × Current
4.) W=Pt
PLEASE SOMEONE HELP!! what is the answer? WILL MARK BRAINLIEST!!
Answer:
A.
Explanation:
The answer should be A.
i apologize if it is incorrect-
I hope it helps! Have a great day!
Anygays-
Which condition is necessary for a lunar eclipse to occur?.
For a lunar eclipse to occur, the Sun, Earth, and Moon must be roughly aligned in a line. Otherwise, the Earth cannot cast a shadow on the Moon's surface and an eclipse cannot take place. When the Sun, Earth, and Moon come together in a straight line, a total lunar eclipse takes
Which planet, other than earth, has visible water ice on it?.
1. Dylan claims that the vase would achieve a higher height if it were launched at a 45-degree angle. Is
Dylan correct?
A. Dylan is correct because a 45-degree launch angle results in the largest vertical range.
B. Dylan is correct because larger launch angles result in a smaller vertical range.
C. Dylan is incorrect because a 90-degree and 45-degree larr
tin the same vertical
range.
D. Dylan is incorrect because a 90-degree launch angle resuh
vertical range
Adaptations are unique traits developed by organisms to help them survive, thrive, and reproduce in their particular environment. Adaptations may be structural or behavioral. Which of the following is an example of a behavioral adaptation?
A) shallow roots of cacti
B) long neck of a giraffe
C) migration of birds
D) webbed feet of ducks
Answer:
its c - the migration of birds
Explanation:
i did it on study island
Which terms describe the different movements of earth? check all that apply. rotation revolution tilted orbit lunar cycle elliptical orbit
Revolution and rotation are the terms that describe the different movements of the earth.
What is the earth?Our home planet is Earth. Earth and its moon, according to scientists, originated about the same period as the rest of the solar system.
That would have been around 4.5 billion years ago, according to scientists. Earth is the solar system's fifth-largest planet.
The rotation and revolution of the earth are two different movements. The movement of the earth on its axis is known as rotation.
Revolution is the movement of the earth around the sun in a fixed route or orbit. The earth's axis, which is an imaginary line, forms a 6612° angle with its orbital plane.
Hence revolution and rotation are the terms that describe the different movements of the earth.
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A flywheel is rotating with an angular velocity of 1.4 rad/s and is acted on by an acceleration of 0.6 rad/s².
a) What angular velocity will it have attained after three complete turns?
b) How long will it take to do those three turns?
(a) The final angular velocity of the flywheel after 3 complete revolutions is 4.96 rad/s.
(b) The time taken for the flywheel to make 3 complete revolutions is 5.93 s.
Final angular velocityThe final angular velocity of the flywheel after 3 complete revolutions is determined by applying third kinematic equation as shown below;
θ = 2π (rad/rev) x (3 rev) = 18.85 rad
ωf² = ωi² + 2αθ
ωf² = (1.4)² + 2(0.6)(18.85)
ωf² = 24.58
ωf = √24.58
ωf = 4.96 rad/s
Time of motionThe time taken for the flywheel to make 3 complete revolutions is calculated as follows;
ωf = ωi + αt
t = (ωf - ωi)/α
t = (4.96 - 1.4)/0.6
t = 5.93 s
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Which of these invertebrates have asymmetric bodies?
Answer:
Sponges
Explanation:
It would be either sponges or flatworms.
I apologize if it is incorrect-
I hope it helps! Have a great day!
Anygays-
Since many wavelengths of light are measured in nanometers, it's useful to know that planck's constant (h) multiplied with the speed of
light (c) is equal to 1240 eVnm.
This is useful, as E = hf, or otherwise written as E= .
With this information in mind, solve the following:
A photon has 1.6 eV of energy. What is the wavelength of this photon?
O a
410 nm
Ob
775 nm
Ос
1984 nm
Od
306 nm
Answer:
E = h f and since f = c / λ we have E = h c / λ
Thus λ = h c / E
Also, 1 ev = 1.6E-19 C
λ = 6.63E-34 * 3.0E8 / (1.6 * 1.6E-19)
λ = 6.63 * 3.0 / (1.6 * 1.6) * E-7
λ = 7.77E-7 = 777 nanometers
(B) is correct
How much work can a 1000-watt motor do in 5.0 seconds?
A. 4.0 × 101 J
B. 2.0 × 102 J
C. 5.0 × 103 J
D. 2.5 × 104 J
Answer:
C
Explanation:
watt = j/sec and work = j
so multiply watt * sec to get work
1000 j/sec * 5 sec = 5000 j = 5 x 10^3
A spaceship moves at a constant velocity of 0.400c relative to an Earth observer. The pilot of the spaceship is holding a rod, which he measures to be 1.00 m long. The rod is held perpendicular to the direction of motion of the spaceship. How long is the rod according to the Earth observer
Since the rod is held perpendicular to the direction of motion of the spaceship, the rod is 1.00 m long to an Earth observer.
To answer the question, we use the principle of length contraction in relativity.
What is Length contraction?The principle of length contraction states that the length of an object would only contraction when it is in the direction of motion.
So, since the 1.00 m long rod is in the spaceship is held perpendicular to the direction of motion of the spaceship, there is no length contraction and thus, an observer on the Earth measures the same length of 1.00 m.
So, Since the rod is held perpendicular to the direction of motion of the spaceship, the rod is 1.00 m long to an Earth observer.
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What do you mean by electromagnetic induction?
What do you mean by electromagnetic induction ?
Well Explained Answer : -Discovery : -
A British scientist Michael Faraday and an American scientist Joseph Henry discovered the phenomenon of electromagnetic induction in 1831 independently.
Definition / Meaning : -
The production of electricity from magnetism is called electromagnetic induction.
Or ,
Electromagnetic induction is the phenomenon of the production of an induced current in a coil placed in a region where the magnet field changes with time
For Example : -
(i) If a bar magnet is moved in and out of coil of wire , even then an electric current is produced. This is an example of electromagnetic induction.
(ii) Another example , when a straight wire is moved up and down rapidly between the two poles of a horseshoe magnet , then an electric current is produced in the wire. This is also an example of electromagnetic induction .
#[tex] \rm{ \bold{Keep \: Learning}}[/tex]Electromagnetic induction denotes to producing electricity using magnetic field or magnetism.
This is the process or phenomenon of production of induced induced current in a region where magnetism changes with respect to the time.
It was discovered by great scientist Michael Faraday.
The batteries of some flashlights can be charged by turning a handle. Which energy transformation is happening in this process
The energy transformation that is happening in this process is mechanical energy to chemical energy.
Energy ConversionAccording to conservation of energy, energy can not be distroyed and cannot be created, but can only be transformed from one form to another.
The batteries of some flashlights can be charged by turning a handle. The energy transformation that is happening in this process is mechanical energy to chemical energy. The chemical energy will transform to electrical energy which will eventually transform to light energy.
The turning of the handle is mechanical and the energy in battery is chemical.
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If we say that a galaxy has a lookback time of 1 billion years, we mean that _________.
Answer:
its light traveled through space for 1 billion years to reach us
Explanation:
Which sound frequency could a human detect? 1 hertz 10 hertz 50 hertz 50,000 hertz.
Answer:
Good human ears can detect sound from about 50 Hz to about 20,000Hz (20 kHz); this can be called the audible range of frequencies.
so c.50 hertz
Explanation:
Hope it helps :)
Answer:
50 hertz
Explanation:
This is right
a roller coaster of mass 2000kg is rolling down a track with an instantaneous speed of 10m/s
The given is:Mass – 2000 kg
The given is:Mass – 2000 kgInstantaneous speed – 10 meter per second
Step: 1Step: 1K.E= 1/2mv^2
Where, K.E – Kinetic energy in joules:
m – Mass in kg
v – Velocity or speed in meter per second
Step: 2From the give,
m = 2000 kg
v = 10 m/s
Equation (1) becomes,
K.E= 1/2 (2000) (10)^2
= (0.5)(2000)(100)
= 100000
K.E = 100,000 Joules
The kinetic energy is 100,000 Joules, if a roller coaster of mass 2000 kg is rolling down a track with an instantaneous speed 10 m/s.
Please Help Physics!
1. Sound travels through a guitar string at 600 m/s, making a sound wave in the air with a speed of 333 m/s. In 1–2 sentences, explain how the wavelength and frequency of the wave in the string compare to the wavelength and frequency of the wave in the air.
The wavelength and frequency of the sound in the string is greater than the wavelength and frequency of the sound in the air.
Wavelength and freqeuncy of the soundThe wavelength and frequency of the sound is determined using the following formulas.
v = fλ
f = v/λ
λ = v/f
where;
f is the frequency of the soundλ is the wavelengthWavelength and frequency of the sound in the stringf = 600/λ
λ = 600/f
Wavelength and frequency of the sound in airf = 333/λ
λ = 333/f
Thus, the wavelength and frequency of the sound in the string is greater than the wavelength and frequency of the sound in the air.
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Explain How can an endergonic reaction not be endothermic?
Answer:
Answer below in pic
I hope my answer helps you.
Answer:
I totally agree with what the person above me said.It is correct
What was the first car fitted with an alternator, rather than a direct current dynamo?.
Answer:
The first vehicles fitted with an alternator was vehicles during WWll.
Chrysler Corporation fitted an alternator on the Valiant 1960 as standard equipment
Explanation:
Answer:
The first car fitted with an alternator, rather than a direct current dynamo was the 1960 Plymouth Valiant.
You serve a volleyball with a mass of 2.1kg the ball leaves your hand with a speed of 30 m/s. What is the kinetic energy of the ball?
Answer:
945 joules
Explanation:
the formula for kenetic energy is:
0.5 × m × v^2
where m is in (kg) ane (v) is in meter per second.
so we can just use the formula;
0.5 × 2.1 × 30^2
so the answer is 945 joules
