Ohm's Law is a formula used to calculate the relationship between voltage, current and resistance in an electrical circuit.
Equation :
To students of electronics, Ohm's Law (E = IR) is as fundamentally important as Einstein's Relativity equation (E = mc²) is to physicists.
E = I x R
When spelled out, it means voltage = current x resistance, or volts = amps x ohms, or V = A x Ω.
NOTE : Because resistance cannot be measured in an active circuit, Ohm's Law is particularly helpful when determining resistance. The aforementioned application of Ohm's Law allows a technician to calculate R without having to turn the circuit off to measure resistance.
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which degree is best for science student?
Answer:
Computer Science or Science technology
Explanation:
It all depends on what aspect of science you're looking into such as biology, zoology, marine biology, etc. But since this world is evolving more and more around technology, your best bet is to get into something computer science or science technology.
When you see a quantity like 20 m/s N, how do you know that it's a vector quantity and not a scalar quantity?
We know that 20 m/s N is a vector quantity because N in the expression signifies the direction
What is a vector quantity?This is a which have both magnitude and direction. Example include:
VelocityDisplacementForceAccelerationMomentWeightHow to determine whether 20 m/s N is a vector quantity20 m/s indicates just the speed i.e magnitude20 m/s N indicates the speed i.e magnitude why the N indicates the direction.Thus, we can conclude that 20 m/s N is a vector quantity because it has both magnitude and direction.
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Which action can humans take to reduce wave erosion?
build drainage systems
build houses near coastlines
build breakwaters in the ocean
reduce vegetation along coastlines
The action that humans can take to reduce wave erosion is to build breakwaters in the ocean.
What is erosion?The term erosion has to do with the washing away of top soil either by water or by wind. The control of erosion is a very important soil conservation effort.
Hence, the action that humans can take to reduce wave erosion is to build breakwaters in the ocean.
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Answer: (C) build breakwaters in the ocean
Explanation: Got it on edge
A car initially traveling at 15.0 m/s accelerates at a constant rate of 4.50 m/s2 over a distance of 45.0 m. How long does it take the car to cover this distance? Show all work leading to the answer including the data, equation, substitution and the final answer with units for full credit.
Answer:
2.24 seconds
Explanation:
xf = xo + vo t + 1/2 at^2
45 = 0 + 15 t + 1/2 (4.5) t^2
2.25 t^2 + 15t - 45 = 0 Quadratic formula shows t = 2.24 seconds
The car takes approximately 2.25 seconds to cover a distance of 45.0 meters under the given conditions of constant acceleration.
Given data:
Initial velocity (u) = 15.0 m/s
Acceleration (a) = 4.50 m/s²
Distance (s) = 45.0 m
We can use the kinematic equation to solve for time (t) when the car covers a certain distance under constant acceleration:
S = ut + 1/2at²
Where:
s = distance
u = initial velocity
a = acceleration
t = time
Plugging in the given values:
45.0 = 15.0t + 1/2 m/s²t²
2.25t² +15t - 45 = 0
t = 2.25sec and -8.92sec
Since time cannot be negative in this context, we discard the negative solution.
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When two or more capacitors are connected in series across a potential difference.
Explanation:
1. the potential difference across the combination is the algebraic sum of yhe potential differences across the individual capacitors
2. the equivent capacitance of the combination is less than the capacitance of any of the capacitors..
VR is always greater than MA. why?
Answer:
The mechanical advantage (M.A) of a real machine is always less than its velocity ratio(V.R) because mechanical advantage decreases due to the friction and weight of moving parts of the machine whereas the velocity ratio remains constant.
Gerry is looking at salt under a powerful microscope and notices a crystalline structure. What can be known about the salt sample that Gerry is looking at?
The atoms have spread out from each other.
The atoms are sliding past each other.
The atoms have no particular pattern.
The atoms are vibrating in place.
i know it is c
here is the answer
draw suitable diagrams where necessary
1. describe an experiment for the measurement of specific heat capacity of a liquid by principle of mixtures
The experiment is described below in the explanation.
What is specific heat?The specific heat is the amount of heat required to change the temperature by 1°C. It is denoted by C.
Heat lost or gained is represented as
Q = m C ΔT
In a calorimeter, a liquid is filled into the the cup with a temperature. A rod with high temperature is inserted into that liquid.
We use principle of mixture by putting a heated rod in a liquid and then measuring the rise of temperature of liquid.
So, heat is lost by rod and gained by liquid and colorimeter.
Thus, experiment is described.
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two point charges of magnitude 4.0 μc and -4.0 μc are situated along the x-axis at x1 = 2.0 m and x2 = -2.0 m, respectively. what is the electric potential at the origin of the xy-coordinate system?
The electric potential at the origin of the xy coordinate system is negative infinity
What is the electric field due to the 4.0 μC charge?The electric field due to the 4.0 μC charge is E = kq/r² where
k = electric constant = 9.0 × 10 Nm²/C², q = 4.0 μC = 4.0 × 10 C and r = distance of charge from origin = x₁ - 0 = 2.0 m - 0 m = 2.0 mWhat is the electric field due to the -4.0 μC charge?The electric field due to the -4.0 μC charge is E = kq'/r² where
k = electric constant = 9.0 × 10 Nm²/C², q' = -4.0 μC = -4.0 × 10 C and r = distance of charge from origin = 0 - x₂ = 0 - (-2.0 m) = 0 m + 2.0 m = 2.0 mSince both electric fields are equal in magnitude and directed along the negative x-axis, the net electric field at the origin is
E" = E + E'
= -2E
= -2kq/r²
What is the electric potential at the origin?So, the electric potential at the origin is V = -∫₂⁰E".dr
= -∫₂⁰-2kq/r².dr
Since E and dr = dx are parallel and r = x, we have
= -∫₂⁰-2kqdxcos0/x²
= 2kq∫₂⁰dx/x²
= 2kq[-1/x]₂⁰
= -2kq[1/x]₂⁰
= -2kq[1/0 - 1/2]
= -2kq[∞ - 1/2]
= -2kq[∞]
= -∞
So, the electric potential at the origin of the xy coordinate system is negative infinity
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which of the following would increase
Answer:
1 and 3
Explanation:
1 and 3
Increasing coils increases strength
COOLING the wire would increase current flow and strength of magnet
Adding an iron core will definitely increase the strength of the electromagnet
(1) Increasing the number of coils (✔)
a ball is thrown upward from the ground with an initial velocity of 50m/s. what is the total time spent by the ball in the air (g=10m/s2)
Answer:
[tex]\fbox {5 seconds}[/tex]
Explanation:
The formula which is used here :
[tex]\fbox {v = u + at}[/tex]
[tex]\longrightarrow \textsf {v : final velocity}[/tex]
[tex]\longrightarrow \textsf {u : initial velocity}[/tex]
[tex]\longrightarrow \textsf {a : acceleration}[/tex]
[tex]\longrightarrow \textsf {t : time taken}[/tex]
Solving :
v = u + at
0 = 50 + (-10)t
10t = 50
t = 5 seconds
what is the magnification of a mirror that
Answer:
1.1111111
Explanation:
The formula for magnification (M) as already given is:
M= V/U
Where V is anything that has to do with image . such as image height or image distance And U is anything that has to do with object such as object height or object distance .
Image height (V) = 2m
Object height(U) = 1.8m
M = V/U
M= 2/1.8
M= 1.111111
Perform the following mathematical operation and report answer to the correct number of significant figures 143.6 divided by 21.2
The answer to the correct number of significant figures is 6.774.
What is quotient?When a number(big) divided smaller number, the answer obtained greater than zero is called a quotient.
Divide 143.6 ÷ 21.2
143.6/21.2 = 1436/212
=6.77358
The quotient is rounded to three significant figures after decimal
143.6 ÷ 21.2 = 6.774
Thus, the answer to the correct number of significant figures is 6.774
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compared to other spiral galaxies, the milky way is ____.
The Milky Way, a member of the "Local Group," is different than other galaxies in the universe. First, it is brighter than most galaxies that we have been able to see. Second, the Milky Way is a barred spiral galaxy; unlike typical spiral galaxies, barred spiral galaxies have flat discs in their centers.
Answer:
The Milky Way Galaxy, is a spiral galaxy, meaning that there are multiple arms spiraling in toward the middle of the galaxy. Are there any other galaxies in the universe shaped like the Milky Way Galaxy?
hello i need help with this!!
Answer:
Yes
Explanation:
If lamp A burnt out there would still be a wire above it that connects lamp B and C to the power source
Cancer and diabetes are two common hereditary diseases.
It is a true statement that cancer and diabetes are two common hereditary diseases.
What are hereditary diseases?The term hereditary diseases are those diseases that occur in parents and could also be found in their offspring. For many of these hereditary diseases, the mechanism of inheritance is unclear.
However, it is a true statement that cancer and diabetes are two common hereditary diseases.
Missing parts:
Cancer and diabetes are two common hereditary diseases. A. True B. False.
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Question 16 of 25
Which of the following best describes an alternating current?
A. A circuit that has both series and parallel components
B. Charge that moves in a single direction
C. Charge that jiggles back and forth very quickly
D. A circuit that has only series or only parallel components
SUBMIT
Answer:
it is c
Explanation: i just did it
A 1.0-g string that is 0.64 m long is fixed at both ends and is under tension. This string produces a 100-Hz tone when it vibrates in the third harmonic. The speed of sound in air is 344 m/s. The tension in the string is closest to
The tension in the given string of 1.0 g and length of 0.64 m is closest to 2.84 N
Tension in the string
The tension in the string at nth harmonic is calculated as follows;
[tex]f_n = \frac{n}{2l} \sqrt{\frac{T}{\mu} }[/tex]
where;
n th harmonic = 3L is length of the string = 0.64 mμ is mass per unit length = (1 x 10⁻³ kg)/(0.64 m) = 0.00156 kg/mf is frequency = 100 HzT is tension in the string = ?[tex]f_n = \frac{n}{2l} \sqrt{\frac{T}{\mu} }\\\\\frac{f_n(2l)}{n} = \sqrt{\frac{T}{\mu} }\\\\\frac{f_n^2(4l^2)}{n^2} = \frac{T}{\mu} \\\\T = \mu (\frac{f_n^2(4l^2)}{n^2})\\\\T = 0.00156(\frac{100^2 \times 4\times 0.64^2}{3^2} )\\\\T = 2.84 \ N[/tex]
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A 1-kg block starts sliding up a 30o inclined plane with an initial velocity of 4.00 m/s. How far will the block travel before coming to rest, if the surface is rough and the coefficient of kinetic friction between the block and the ramp is 0.2.
The block will travel 2.038 m before stopping. Newton's third equation of motion is applied in the given problem.
What is the friction force?It is a type of opposition force acting on the surface of the body that tries to oppose the motion of the body. its unit is Newton (N).
it is defined as the product of the coefficient of friction and normal reaction.
On resolving the given force and acceleration. Mathematically in the different components and balancing the equation gets.Components in the x-direction.
From Newton's third equation of motion;
v²=u²+2as
0 =u²+2(-a)s
u²=2as
u²=2×(2×μg)s
4.00 m/sec = √2×(2 ×0.2 ×9.81 s
16 = 7.848 s
s = 2.038 m
Hence, the block will travel 2.038 m before stopping.
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a 5200w electric oven
Answer:
104 kWh
Explanation:
To calculate the kWh you multiply power with the amount of hours.
So for this we take 5200 W × 20 = 104 000 Wh
Then change Wh to kWh so that makes 104 kWh
Which of the following is an example of an electromagnetic wave?
Sound
Ocean waves
Seismic waves
Red light
Answer:
red light light is an electromagnetic wave thats whyy
hope it helped
Explanation:
I finished all my other questions but i don't know how to do this one. could someone help me? I added a lot of points because I know this is pretty complicated.
Explanation:
hope it will help you understand, if you have any questions just let me know.
One exciting fairground ride acts like a giant catapult. The capsule which the ‘rider’ is strapped in is fired high into the sky by rubber straps. Explain the energy changes taking place on the ride.
Answer:
- elastic energy of rubber straps → KE of capsule
- KE → GPE as capsule
Explanation:
HELP PLEASE!!! In the diagram, q1 = -6.39*10^-9 C and q2 = +3.22*10^-9 C. What is the electric field at point P? Include a + or - sign to indicate the direction. 91 92 P 0.150 m ** 0.250 m (Hint: The distance from q1 to P is NOT 0.150 m.) (Remember, E points away from + charges, and toward charges.) (Unit = N/C) HELP PLEASE!!
Answer:
E = K Q / R^2
E1 = K Q1 / R1^2 = K * (-6.39 E-9) / .4^2 = -K 39.9 E-9
E2 = K Q2 / R2^2 = K * 3.22 E-9 / .25^2 = K 51.5 E-9
Field will point to right of P since E2 (positive) stronger
E = K (E2 - E1) = 9.0 E9 * (51.5 - 39.9) E-9 = 104 N/C
The electric field at point P is 104.6 N/C.
What is meant by electric field ?Every place in space where a charge exists in any form has an electric attribute that can be defined as the electric field.
Here,
q₁ = -6.39 x 10⁻⁹C
q₂ = 3.22 x 10⁻⁹C
Distance from q₁ to P, d₁ = 0.4 m
Distance from q₂ to P, d₂ = 0.25 m
Electric field at P due to q₁, E₁ = k x -6.39 x 10⁻⁹/(0.4)²
E₁ = -39.9 x 10⁻⁹k N/C
Electric field at P due to q₂, E₂ = k x 3.22 x 10⁻⁹/(0.25)²
E₂ =51.52 x 10⁻⁹k N/C
Therefore, total electric field at P,
E = E₂ - E₁
E = (51.52 - 39.9) x 10⁻⁹k
E = 104.6 N/C
Hence,
The electric field at point P is 104.6 N/C.
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A racing car has a mass of 1910 kg. The acceleration of gravity is 9. 8 m/s 2. What is its kinetic energy if it has a speed of 109 km/h? answer in units of j.
Assuming a current is flowing, what increases the strength of the magnetic field of a coiled electrical wire?.
Answer:The amount of current flowing
Explanation:this derives from amperes law of maxwell’s equations. It’s easiest to see in differential form. The curl of the magnetic field is proportional to the current plus the change (time derivative) in electric field
5. Calculate the area if the force is 368N and the pressure is 28Pa..
The area would be 13.1429 Meter².
Answer:
[tex]\boxed {Area = 13.14 m^{2}}[/tex]
Explanation:
Formula applied :
[tex]\boxed {Area = \frac{Pressure}{Force}}[/tex]
Given :
Force = 368 NPressure = 28 PaSolving :
Area = 368/28Area = 92/7Area = 13.14 m² (approx.)write a beta decay equation for the
transmutation of a radioactive isotope of Rutherfordium, which has 104 protons
and 183 neutrons.
PLS HELP ASAP!!!!
The beta decay equation for the transmutation of a radioactive isotope of Rutherfordium has been explained above will be,[tex]\rm Re_{104}^{287} + \beta_0^{-1} \rightarrow Re_{104}^{286}[/tex]
What is the rate of decay?The reduction in the number of radionuclides per unit time is the rate of decay.
The beta decay equation for the transmutation of a radioactive isotope of Rutherfordium has 104 protons and 183 neutrons.
Atomic weight = 104+183 = 287
Atomic number = 104
The beta decay equation is;
[tex]\rm Re_{104}^{287} + \beta_0^{-1} \rightarrow Re_{104}^{286}[/tex]
Hence the beta decay equation for the transmutation of a radioactive isotope of Rutherfordium has been explained above.
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When the humerus moves in the glenoid fossa, the moving joint surfaces are:
When the humerus moves in the glenoid fossa, the moving joint surfaces are convex on concave.
What is Glenoid fossa?This is a bone depression in which the head of the humerus fits into to aid movement and support.
The moving joint surfaces are convex on concave in structure when humerus moves in the glenoid fossa.
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What is the main difference between a longitudinal wave and a transverse wave? a longitudinal wave always travels faster than a transverse wave. a longitudinal wave does not need a medium to travel through. a transverse wave is made of particles that move perpendicular to the motion of the wave. a transverse wave always carries more energy so that it can travel through empty space.
In a longitudinal wave, the propagation of energy is in the direction of the motion, while in a transverse wave the propagation of energy is perpendicular to the direction of motion.
What is longitudinal wave and Transverse wave?Longitudinal wave is a wave which moves in the direction from where it was started. It has a compression (increased intensity) of the medium particles and a rarefaction ( reduced intensity).
Transverse wave is wave that travels perpendicular or at right angles to the direction from where it was started.
The main differences between longitudinal wave and Transverse wave are:
Transverse wave, the medium moves vertically up and down while in the longitudinal wave, the medium moves left to right.Transverse wave has a crest and a trough while the longitudinal waves have a compression and rarefaction.Transverse waves don't have a pressure variation , longitudinal waves have a pressure variation.Transverse waves can only be propagated in solids and on the surfaces of liquids, Longitudinal waves can be propagated in solids, liquids and gases.Transverse waves don't change in density throughout the medium, longitudinal waves have a change in density throughout the medium.Therefore,
The propagation of energy is in the direction of the motion, while in a transverse wave the propagation of energy is perpendicular to the direction of motion.
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