Answer:
Smoke alarms detect fires by sensing small particles in the air using a couple of different kinds of technologies. Once they detect those particles above a certain threshold, they signal the alarm to sound so that you and your family can get to safety and call 911. Smoke alarms save lives.
Calculate the current in the above circuit.
Answer:
4 A
Explanation:
From the question given above, the following data were obtained:
Voltage (V) = 12 V
Resistance (R) = 3 Ω
Current (I) =?
From ohm's law,
Voltage (V) = Current (I) × Resistance (R)
V = IR
With the above formula, we can obtain the current flowing in the circuit as illustrated below:
Voltage (V) = 12 V
Resistance (R) = 3 Ω
Current (I) =?
V = IR
12 = I × 3
Divide both side by 3
I = 12/3
I = 4 A
Therefore, the current flowing in the circuit is 4 A.
explain how electric motors convert electrical energy to mechanical energy
Answer:
[tex]\rightarrow[/tex] Electric motors build energy through the interaction between magnetic fields.
Magnetic fields may be generated by passing a current through a wire. Winding that wire into a coil intensifies the sector. Wrapping the coil around an iron core can intensify it more. One is going to be of the coil are North, the other South. Reverse the flow of current through the coil. The magnetic poles can swap. Place 2 separate coils close to one another and organize them therefore one turns whereas the opposite is fastened. Then build arrangements for this within the moving coil to reverse even as the opposite poles are about to line up.
Hope it helps!<3
Bats have poor vision and use echo-location to find their way.The frequency produced by bats is 100kHz. If the speed of the sound is 345m/s , how deep is the cave if the bat makes peeping sounds that return to the bat after 0,15s??
The distance covered is 25.9 m.
How deep is the cave?We know that the speed of sound refers to the speed with which an sound moves in an object.
Given that;
speed of sound = 345m/s
Time taken = 0.15s
We know that;
v = 2d/t
v = speed of sound
d = distance
t = time taken
vt = 2d
d = vt/2
d = 345m/s * 0.15s/2
d = 25.9 m
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bob hits a baseball.what two systems are working together to make this happen
Answer:
Kinetic Energy and Mechanical energy
Explanation:
can anyone help me with this question please
Explanation:
V=u+at
where,
v=final speed
u=initial speed,(starting speed)
a=acceleration
t=time
v=u+at = 6=2+a*26=2+2a
2a=6-2
2a=4
a=4/2 = 2
a =2
2. to find time taken
v=u+at
25=5*2t
2t=25-5
2t=20
t=20/2
t=10sec
3. finding final speed
v=u+at
v=4+10*2
=4+20
v=24m/sec
5.v=u+at
=5+8*10
=5+80
V=85m/sev
6. v=u+at
8=u+4*2
8=u+8
U=8/8
u=1
these are your missing values
In a nuclear reactor, electricity is produced from
Answer:
Nuclear reactors are the heart of a nuclear power plant. They contain and control nuclear chain reactions that produce heat through a physical process called fission. That heat is used to make steam that spins a turbine to create electricity
~+lil more info!+~
What material is used to power a nuclear reactor?
uranium !
All commercial power reactors are based on nuclear fission. They generally use uranium and its product plutonium as nuclear fuel, though a thorium fuel cycle is also possible.
A child rides a bicycle in a circular path withí a radius of 3.0 m. The
tangential speed of the bicycle is 2.0 m/s. The combined mass of the bicycle and the child is 43 kg.
Answer:
57.3N
Explanation:
Given parameters:
radius of the path = 3m
tangential speed = 2m/s
mass of the bicycle and child = 43kg
Unknown:
centripetal force = ?
Solution:
The centripetal force is the inward force on a body round a circular path.
It is expressed as;
F = [tex]\frac{mv^{2} }{r}[/tex]
F is the centripetal force
m is the mass
v is the tangential speed
r is the radius
F = [tex]\frac{43 x 2^{2} }{3}[/tex] = 57.3N
) observer a, who is at rest in the laboratory, is studying a particle that is moving through the laboratory at a speed of v
The distance between the markers in the laboratory where the particle is produced and where it decays is 30.24m.
What is radioactive decay?
Radioactive decay, also known as nuclear decay, radioactivity, radioactive disintegration, or radioactive decay, is the process by which an unstable atomic nucleus loses energy through radiation. A substance that has unstable nuclei is regarded as radioactive. Alpha decay, beta decay, and gamma decay are three of the most frequent kinds of decay, and they all entail the emission of one or more particles. Beta decay is a result of the weak force, while the nuclear force and electromagnetism are in charge of the other two mechanisms. Electron capture, which occurs when an unstable nucleus seizes an inner electron from one of the electron shells, is the fourth prevalent kind of decay.
Explanation:
From the perspective of observer A, the particle had a lifetime of 112 ns and moved at a speed of 0.9c.
0.9c = 2.7e8 m/s
112 ns = 1.12e-7 s
Since we already know the time and speed from the viewpoint of observer A, we can use those to determine the distance from that viewpoint without the need for any modifications.
[tex]d=v*t=2.7e8*1.12e-7=30.24m[/tex]
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The magnetic moment of the Earth is approximately 8.00 ×10²²A.m² . Imagine that the planetary magnetic field were caused by the complete magnetization of a huge iron deposit. with density 7900 kg / m³, and approximately 8.50×10²⁸ atoms / m³, (a) How many unpaired electrons, each with a magnetic moment of 9.27 ×10⁻²⁴A.m² , would participate?
[tex]4.315 \times10^{45}[/tex] unpaired electrons,are required each with a magnetic moment of 9.27 ×10⁻²⁴A.m² , to participate .
Magnetic moment, additionally referred to as dipole moment, may be a live of the tendency of associate degree object to align with a field of force. torsion may be a vector amount. Objects tend to be placed in order that their torsion vectors square measure parallel to the lines of magnetism. The direction of the torsion points from the South Pole of the magnet to the North Pole. The field of force made by a magnet is directly proportional to its torsion."Magnetic moment is outlined because the magnetic strength and orientation of a magnet or alternative object that produces a field of force."It is given that magnetic moment of the Earth is approximately 8.00 ×10²²A.m² .
Number of unpaired is found by dividing the magnetic moment of the Earth to the given magnetic moment of 9.27 ×10⁻²⁴A.m²
[tex]n=\frac{8.00\times10^{22}}{9.27\times10^{-24}} \\\\n=8.63\times10^{45}[/tex]
Each iron atom has two unpaired electrons, so the number of iron atoms required is [tex]\frac{1}{2}\times 8.63\times10^{45}=4.315\times10^{45}[/tex] electrons.
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Two neutral objects, 1 and 2, are suspended by strings near one another. Object 2 is touched by a positively-charged insulated rod.
Immediately after the insulated rod is removed, Object 1 and Object 2 repel. What causes the two objects to repel?
Answer:
When 2 objects are in contact with one another and one of them receives a positive or a negative charge, then the objects will repel one another because they are similarly charged.
What is the displacement of the object from 12 seconds to 16 seconds ?
Answer:
Displacement is the distance between an object’s initial position and its final position and is usually measured or defined along a straight line. Since this is a calculation that measures distance, the standard unit is the meter (m).
Explanation:
A spring with a constant of 92N/m is compressed 2.8 cm. How much potential energy is stored in the spring?
PE= J
Answer:
0.036J
Explanation:
Given parameters:
Spring constant , K = 92N/m
Compression = 2.8cm = 0.028m
Unknown:
Potential energy = ?
Solution:
To solve this problem;
P.E =[tex]\frac{1}{2}[/tex] K e²
K is the spring constant
e is the compression
so;
P.E = [tex]\frac{1}{2}[/tex] x 92 x 0.028² = 0.036J
Mankind causes major disruptions within ecosystems
- true
-false
Answer:
true
Explanation:
common sense i am just guessing.
Answer: True
Explanation: For instance cutting trees for paper.
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A 1kg cart is accelerating at 2 m/s2 due to a constant force. If that same net force was applied to a cart with twice as much mass, what acceleration would it have?
Answer:1m/s2
Explanation:
M With particular experimental methods, it is possible to produce and observe in a long, thin rod both a transverse wave whose speed depends primarily on tension in the rod and a longitudinal wave whose speed is determined by Young's modulus and the density of the material according to the expression v = √(Y/rho) . The transverse wave can be modeled as a wave in a stretched string. A particular metal rod is 150cm long and has a radius of 0.200cm and a mass of 50.9 g . Young's modulus for the material is 6.80× 10¹⁰N/m² . What must the tension in the rod be if the ratio of the speed of longitudinal waves to the speed of transverse waves is 8.00 ?
The tension in the rod when the ratio of speed is 8 is 1.34 × 10⁴ N.
The longitudinal waves speed is determined using the density of the material and the Youngs modulus with the expression:
v = √(Y/rho)
A wave in a stretched string can be used to represent the transverse wave.
The length of the metal rod is 150 cm and the radius of the rod is cm.
The mass of the rod is 50.9 g.
Now, the Youngs modulus for the material is 6.80× 10¹⁰ N/m².
For the longitudinal wave
v(l) = (Y/ρ)^{1/2}
For the transverse wave :
v(T) = (Y/μ)^{3/2}
Now, we need
v(L) / v(T) = 8
And we know,
T = (μY) / (64ρ) where μ= m /L
And the density, ρ = mass / volume = (m) / (πr²L)
Therefore,
T = (πr²Y) / 64
T = (π)(2 × 10⁻³)² × (6.8 × 10¹⁰) / 64
T = 1.34 × 10⁴ N
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two particles, one with charge −3.77 μc and one with charge 6.91 μc, are 5.84 cm apart. what is the magnitude of the force that one particle exerts on the other?
The magnitude of the force that one particle exerts on the other = [tex]6.8644 \times 10^{13}[/tex] N
Charge of one particle,[tex]Q_1[/tex] = -3.77 μC
Charge of the other particle,[tex]Q_2[/tex] = 6.91 μC
The opposite signs of the charges implies the presence of force of attraction between the particles.
Given distance between particles, r = 5.84 cm = 0.0584 m
Coulomb's law states that the magnitude of the force exerted between two particles is directly proportional to the product of magnitude of charges of the particle and inversely proportional to the square of the distance between the particles.
From this we can infer the equation, [tex]F=\frac{kQ_1Q_2}{r^2}[/tex]
where F is the force between the particles and k =[tex]9\times 10^9 Nm^2C^{-2}[/tex] is the Coulomb's Constant.
So F = (9 x 10^9 x 3.77 x 6.91)/(0.0584 x 0.0584)
= [tex]6.8644 \times 10^{13}[/tex] N
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hi im in class and i need help!
Answer:
I think its D.
Explanation:
One long wire carries current 30.0 A to the left along the x axis. A second long wire carries current 50.0 A to the right along the line (y = 0.280m, z = 0). (c) What If? A uniform electric field is applied to allow this particle to pass through this region unelected. Calculate the required vector electric field.
The vector electric field is [tex]-1.73 \times 10^{4} {~}\hat{j} {~}N/C[/tex] .
A stream of charged particles, such as electrons or ions, flowing through an electrical conductor or a vacuum is known as an electric current.
One long wire carries a current I = 30.0 A to the left along the x-axis. I' = 50.0 A of current is being carried by a second lengthy wire to the right along the line (y = 0.280 m, z = 0).
Now,
The charge of a particle is q = - 2.00 μC which is moving with a velocity of [tex]v = 150\hat{i} {~}Mm/s[/tex].
At y = 0.1 m the total magnetic field is:
B = 1.16 × 10⁻⁴ T
Then the force on the particle is:
F =q(v × B)
[tex]F = (-2 \times 10^{-6} )[ ( 150 \times 10^{6})\hat{j} \times (1.16 \times 10^{-4})\hat{k} ][/tex]
F = 3.47 × 10⁻² N
A uniform electric field is applied.
Then the vector electric field will be:
F = qE
3.47 × 10⁻² = (-2 × 10⁻⁶ )E
[tex]E = -1.73 \times 10^{4}{~}\hat{j} {~}N/C[/tex]
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Write a hypothesis based on observations and scientific principles.
Answer:
An example of a hypothesis based on observation and scientific principles is:
Deaf children whose parents are deaf will acquire language faster than deaf children whose parents are not deaf.
A hypothesis is an informed prediction or a tentative statement about what you think that would occur in a scientific experiment as a result of experience from observations accepted by scientific rules and law.
A hypothesis is a testable statement obtained from the research question but questions cannot be tested directly, it is the proposed relationship between the variables that are tested.
An example of a hypothesis is:
Deaf children whose parents are deaf will acquire language faster than deaf children whose parents are not deaf.
This specifies the direction of the hypothesis because one group is faster than the other.
Explanation:
dynamical stability of giant planets: the critical adiabatic index in the presence of a solid core kundu, s.k., coughlin, e.r., youdin, a.n., armitage, p.j., 2021, mnras, submitted
The critical adiabatic index in the presence of a solid core dynamical stability of giant planets is called adiabatic index.
What is adiabatic index?In warm material science and thermodynamics, the intensity limit proportion, otherwise called the adiabatic record, the proportion of explicit warms, or Laplace's coefficient, is the proportion of the intensity limit at steady strain to warm limit at consistent volume. The Adiabatic Index adding machine processes the adiabatic list ( γ) otherwise called the intensity limit proportion or proportion of explicit warms. Accordingly, for normally happening diatomic gases at close to standard circumstances, the adiabatic file can be roughly viewed as around 7/5 or 1.4. The particular intensity proportion or adiabatic list is connected with the levels of opportunity () of a gas particle by the situation.
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Can you please answer qeastion
Answer:
the mantel
Explanation:
yeeeeaaaaaaa
Safety belts protect people in cars in the event of an accident because, according to Newton’s laws of motion, when an impact causes the car to suddenly change its motion -
A.the speed of the people always increases, since now they have not one but two forces acting on them.
B.the speed of the car always increases, giving it greater force since the mass will remain the same.
C.the car now has a greater overall mass - its own mass plus the mass of the object by which it has been struck.
D.the people in the car will continue to move in the same direction and at the same speed as before the impact.
Answer:
D :)
Explanation:
When an impact causes the car to suddenly change its motion, (D) the people in the car will continue to move in the same direction and at the same speed as before the impact.
What is Newton's first law of motion?
Newton's first law of motion states that Unless influenced by an imbalanced force, a body at rest stays at rest, and a body in motion keeps moving in a straight path at a constant pace. This law is commonly known as law of inertia and the resistance of a body to maintain its state of rest is called inertia of rest, same as, the resistance of a body to maintain its state of motion is called inertia of motion.
When a car is moving with certain speed, the car along with the people inside the car is in inertia of motion. In an event of accident, the car comes in rest in no time but the man in the car is still in inertia of motion. So, his body moves forward in the car which may cause injuries. To prevent such injuries, the people inside a car are advised to use safety belts.
So, correct answer is option (D).
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revise and repeat: run a similar experiment with seeds B and C. Do seeds B and C need light to germinate? Describe your findings.
(Earth Science.)
Answer:فربما الى اغبر وابقاء على كل من اراد من دون اي نية لا اريد له الزواج او غيره او لا ربرلرل
الفيفي قثصشسيبزروت
Explanation:١٤٢٣٦٧٧٨٩
This physics problem is kinda complicated to my small brains...
so uh how much work does it take to lift 250kg to 6 meters high
Answer:
[tex]\huge\boxed{\sf P.E. = 14700\ Joules}[/tex]
Explanation:
This work done is in the form of Potential Energy so we'll use the formula of Potential Energy.
Given Data:
Mass = m = 250 kg
Acceleration due to gravity = g = 9.8 m/s²
Height = h = 6 m
Required:
Work Done in the form of Potential Energy = P.E. = ?
Formula:
P.E. = mgh
Solution:
P.E. = (250)(9.8)(6)
P.E. = 14700 Joules
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807Review. A wire having a linear mass density of 1.00 g/cm is placed on a horizontal surface that has a coefficient of kinetic friction of 0.200. The wire carries a current of 1.50 A toward the east and slides horizontally to the north at constant velocity. What are (b) the direction of the smallest magnetic field that enables the wire to move in this fashion?
The direction of the smallest magnetic field that enables the wire to move in this fashion to East.
A magnetic force in the direction of north that is equal in strength to the friction force will be required.
Fm - f = 0
I L B = uk mg = 0.
(1.50 x 1 x B) - (0.20 x 0.1 x 9.8) = 0
B = 0.131 T
b) the magnetic force, Fm = IL x B. (cross product )
- > north F
What emf is induced across the ends of the wire?
The formula can be used to calculate the magnetic force for a moving charge particle;
∈= Bvlsinθ
Due to the parallel motion of the wire, the angle between the magnetic field and velocity is zero degrees.
B = 0.500 T
v = 1.50 m/s
l = 0.200 m
Therefore,
∈ = (0.500 T) (1.50 m/s) * (0.200 m) *sin 0
∈=0.15 * sin 0
∈= 0
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Which tem is the product of force and distance?
O power
O work
O net force
O acceleration
You warm your self besides a fire that you built on the beach...
Conduction
Convection
Or radiation
Answer:
Radiation
Explanation:
Radiation is the transfer of heat through waves. (Fire's hot air/waves warms you)
Not conduction because you have to come in direct contact with the fire in order to be considered conduction.
Not convection because those happen when heat causes a difference in densities, allowing substances to circulate.
2 Calculate the mass of a car that hits a wall, during an accident, with a force of 961 N and an acceleration of 31m/s2. (4D) (F = m * a) *
Answer: 31kg
Explanation:
(F=mxa)
Rearranged
M=f÷a
961÷31=31
Sound waves cause air to oscillate. What do light waves oscillate?
In a diffraction experiment, a laser beam incident on a single slit of width a = 0.02
mm produces a diffraction pattern on a screen 100 cm from the slit. The width of the
central maximum is 2.8 cm. What is the wavelength of the light?
The n-th place is 2×10 −4 m
The diffraction pattern's minima is
nDλ =(3−1) d
Dλ = d
2Dλ
d= x 3 −x
2Dλ = 3×10 −3
2×0.50×6000×10 −10
=2×10 −4 m
Why do diffraction patterns occur?Diffraction of light, as it is used to describe light, occurs more explicitly when a light wave passes by a corner or via an aperture or slit that is physically
Light is diffracted primarily as a function of wavelength (frequency), amplitude, and slit width. The incident waves must have a larger amplitude than the slit width for any diffraction to take place. Diffraction won't happen if the wave is less than the slit width.
The quantity of diffraction increases with the wave's wavelength. When the gap size is almost equal to the wavelength, the most 2×10 −4 m occurs.
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