A circuit has a resistance of 2.5 Ω and is powered by a 12.0 V battery. The current in the circuit, to the nearest tenth
Answer:
The electric current in the circuit is 4.8 A.
Explanation
What is electric current?The number of charge passing through unit cross-sectional area of a conductor in one second, is called electric current. It is denoted by (i) and it is measured in Ampere.
Given data is:
Resistance (R)= 2.5 ΩPotential difference of battery (V)= 12 V
By using formula, [tex]V =i.R[/tex]⇒ [tex]i =\frac{V}{R}[/tex]
On putting values,
[tex]i = \frac{12}{2.5}[/tex]
[tex]i = \frac{120}{25} = 4.8A[/tex]
Hence the current in the circuit is 4.8 A
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Who was the first woman to go to space?
Judy Garland
Sally Ride
Valentina Tereshkova
Neil Armstrong
Yuri Gagarin
A 75.0 kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 4.60m. What is the work done on the man done by gravitational force?
Final answer:
The work done on a 75.0 kg man by gravitational force, as he is moved by an escalator to a vertical height of 4.60 m, is -3393 joules.
Explanation:
The question asks for the work done on a 75.0 kg man by gravitational force while he is being moved by an escalator to a vertical height of 4.60 m. The work done by gravity is calculated using the formula W = mgh, where W is the work, m is the mass, g is the acceleration due to gravity (9.8 m/s2), and h is the vertical height. Since the direction of gravitational force is downward, while the displacement due to the escalator is upward, the work done by the gravitational force will be negative.
To find the work done, we substitute the man's mass (75.0 kg) and the height (4.60 m) into the formula, then multiply by the gravitational constant:
W = (75.0 kg)(9.8 m/s²)(4.60 m)
W = 75.0 kg × 9.8 m/s² × (-4.60 m)
W = -3393 J
Therefore, the work done on the man by the gravitational force is -3393 joules.
An example of a high energy electromagnetic wave is
a radio wave
a red light wave
an x-ray
an infrared wave
------------------------------------------
Give an example of an energy transformation.
------------------------------------------
When heat is transferred to a substance explain why the temperature goes up
Galileo was the first scientist to do which of the following?
Answer
Correct answer is define and measure the speed
Explanation
Galileo was the first scientist who define speed and give the formula of speed as distance over time
discover radioactivity
This option is also not correct because Radioactivity was discovered by Henri Becquerel in 1852.
invent the reflecting telescope
this option is not correct because reflecting telescope was discovered by Sir Isaac Newton in 1668
propose the heliocentric theory:
This option is also not correct because Nicolaus Copernicus proposed the
heliocentric theory in 1543
Which method will provide the most emotional support in a new exercise program?
Describe three ways you could cause an acceleration of a moving car
The three ways you could cause the acceleration of a moving car are by pressing the acceleration pedal, applying the break, pushing the car, or by applying external force.
What is acceleration?Acceleration is the rate at which an object's velocity with respect to time changes. In vector quantities, accelerations exist (in that they have magnitude and direction). The direction of the net force applied to the item determines the object's acceleration. According to the materials used to make the object, the magnitude of the net balance of all external forces acting on it is inversely proportional to its mass, but the magnitude of the net resulting force is directly proportional to the net force.
Acceleration: the rate at which the speed and direction of a moving object vary over time. When something moves faster or slower, it is considered to be accelerating. Motion on a circle accelerates even while the speed is constant because the direction is always changing.
Therefore, the three ways you could cause the acceleration of a moving car are by pressing the acceleration pedal, applying the break, pushing the car, or by applying external force.
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What force makes a marble roll across level ground eventually come to a stop?
Calculate the force of friction for a 5kg aluminum block being pulled with constant velocity (uniform motion) across a horizontal steel plank. ...?
The force of friction between the 5kg aluminum block and the steel plank is 8N, calculated using the formula for friction (Friction = µN), with the coefficient of friction stated as 0.20 and the normal force as 40N.
Explanation:In the given problem, the 5kg aluminum block is sliding on a horizontal steel plank with a constant velocity, which means it is in a state of equilibrium. In such a case, the force due to friction equals the external force applied on the block. From the information provided, the gravitational force and the normal force acting on the block are each 40N, implying that there is no net vertical force acting on the block.
The force of friction can be calculated using the formula: Friction = µN where µ is the coefficient of friction and N is the normal force. Given that µ is 0.20 (from the data provided) and N is 40N (the gravitational force acting on the block), we calculate the force of friction as follows: Friction = 0.20 x 40N = 8N
So, the force of friction acting on the 5kg aluminum block as it moves across a horizontal steel plank is 8N.
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If an object weighs 39.2 n on earth, what is its mass
sketch the I-V graph of a subtance that obeys ohm's law. ...?
Is my answer correct?
question
Scott was watching the electrician install a new light fixture. Scott noticed that when he was finished, he carefully wrapped some wires with plastic caps and black plastic tape. Select the best explanation of why the electrician would wrap electrical wires with plastic products.
answer I chose
The electrical wires are made of metal, which conducts electricity. In order to make the wiring safe, he would wrap the exposed wire with plastic materials, which are good insulators. This keeps the flow of electricity contained to the light fixture and wiring.
Answer:
Yes, the answer is correct.
Explanation:
Plastic is a good insulator of electricity and it prevents electric current from flowing into any living being that may come into contact with that wiring. Hence, the plastic tape and caps prevent any such contact with the live wiring making the entire system safe to be around.
It is the same distance from second base to first base, and from second base to third base. The angle formed by first base, second base, and home plate has the same measure as the angle formed by third base, second base, and home plate. What can you conclude about the distance from first base to home plate, and from home plate to third base? Explain. ...?
The answer is
Converting this into a geometry problem requires us to name the points. Let give the home plate a symbol A, first base will be B, second base will be C, and the third base will be D. Now, we can present a geometrical proof:
STATEMENTS | REASONS
(1) BC = CD | Given
m(2) AC = AC | Reflexive Property
(3) triangle ACD = triangle ACB | SAS Congruence
(4) AD = AB | CPCTC
when CPCTC means Congruent Parts of Congruent Triangles are Congruent.
Therefore, the distance from first base to home plate, and from home plate to third plate are equal.
If energy decreases in one part of a system, what will happen?
a. energy will be created in the system.
b. energy will be destroyed in the system.
c. energy will increase in another part of the same system.
d. energy will decrease in another part of the same system.
If energy decreases in one part of a system, energy will increase in another part of the same system. Therefore, option C is correct.
What is energy ?Energy can be transmitted from an object to do work and is thought of as a quantitative feature. Thus, we might characterize energy as the capacity to engage in any kind of physical action. As a result, the simplest way to describe energy is as the capacity for work.
When a system is heated or has work done on it by its environment, the internal energy of the system is constantly raised. Let's examine two situations that lead to an increase in a system's internal energy.
The process can continue if the free energy drops. The reaction can't continue if the free energy rises. If the system's free energy falls, a reaction is encouraged.
Thus, option C is correct.
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At a stoplight, a truck traveling at 15 m/s passes a car as it starts from rest. The truck travels at constant velocity and the car accelerates at 3 m/s^2. How much time does the car take to catch up to the truck?
A train crosses a platform 100 m long in 60 sec at a speed of 45 kmph. Find the time taken by the train to cross an electric pole.
How do you handle this type of question and also how do you find the length of the train? A train crosses a platform 100 m long in 60 sec at a speed of 45 kmph. Find the time taken by the train to cross an electric pole.
How do you handle this type of question and also how do you find the length of the train?
The train is 650 m long and takes 52 seconds to cross an electric pole at a speed of 45 kmph.
To find the time taken by the train to cross an electric pole, we need to calculate the length of the train. The train crosses a platform 100 m long in 60 sec at a speed of 45 kmph.
First, we convert the speed from kmph to m/s by multiplying with 5/18, giving us:
[tex]45\times\frac{5}{18}[/tex]
The distance covered when the train crosses the platform is the length of the train plus the length of the platform.
The distance = Speed * Time
= 12.5 m/s * 60 s = 750 m
Since the platform is 100 m long, the length of the train is 750 m - 100 m = 650 m.
Now, to cross an electric pole, the train only needs to cover its own length, as the pole will be considered a point with no length. Therefore, the time taken to cross the electric pole is:
Time = Length of the train / Speed
Time = [tex]\frac{650}{12.5}= 52 seconds.[/tex]
So, the train takes 52 seconds to cross an electric pole.
Select all that apply.
Which of the following energy sources are in some way derived from the Sun?
geothermal
nuclear
wave
biomass
Answer:
Wave and Biomass :)
Explanation:
What happens to a fuse to stop the flow of charges through it?
You've just solved a problem and the answer is the mass of an electron, me=9.11×10−31kilograms. How would you enter this number into the answer box?
Enter your answer in kilograms using three significant figures. Note that the units are provided for you to the right of the answer box.
The mass of an electron, me, 9.11 × 10⁻³¹ kilograms shows there are 3 important numbers in them, namely numbers 9, 1, and 1
Further explanationSignificant numbers are obtained from measurement results of exact numbers and the last number estimated
This is called significant numbers
the scientific notation can be described as:
a, ... x 10ⁿ
a, ... called a significant number
10ⁿ is called a big order
Rules for significant numbers in general:
1. All non-zero numbers are significant numbers 2. a zero which is located between two non-zero numbers including a significant number 3. all zeros are located in the final row written behind the decimal point of the include significant number4. zero decimal point is the not significant numberFrom the numbers known in the question amounting to 9.11 × 10⁻³¹ kilograms shows there are 3 important numbers in them,(symbol a, before a big order ,called a significant number) namely numbers 9, 1, and 1
Learn moresignificant figures
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significant figures in the following number: 5.67 x 106
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the number of significant figures is 0.025
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0.080 significant figures
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the fewest number of significant figures
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Keywords : significant number, the scientific notation, decimal point, a big order
The mass of an electron up to three significant digits is written as [tex]\boxed{9.11 \times {{10}^{ - 31}}\,{\text{kg}}}[/tex].
Further Explanation:
The significant numbers in a measured quantity are the numbers that have their role in representation of the measured quantity in terms of the resolution of the quantity.
The scientific notation for any measured quantity is expressed as:
[tex]A = a... \times {10^n}[/tex]
Here, [tex]a[/tex] are the combined significant digits in the quantity.
The number of digits present in [tex]a[/tex] represents the number of significant digits in the representation of the quantity.
The following is the list of rules to be considered for the significant numbers.
a) Each and every non-zero number is a significant number.
b) A zero present between two significant numbers is also a significant number.
c) The zeros written after the decimal point are significant numbers.
d) Only zero before a decimal is not a significant number.
Therefore, the mass of an electron up to three significant digits is written as [tex]\boxed{9.11 \times {{10}^{ - 31}}\,{\text{kg}}}[/tex] and the three significant digits in the number are [tex]9,1\& 1[/tex].
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Answer Details:
Grade: High School
Chapter: Significant Figures
Subject: Physics
Keywords: Significant figures, answer box, rules, non-zero, scientific notation, resolution, measured quantity, physical quantity, mass of electron.
Predict the change that must occur in the electron configuration, if each of the following atoms is to achieve a noble gas configuration.
I need help with nitrogen. I know it gains 3 electrons. so that would make it a ____ ion?
Nitrogen attains the noble gas structure by gaining three electrons.
Stability of atoms has been associated with an atom having two or eight electrons in its outermost shell. This generally referred to as the octet rule. The octet rule is the basis for predicting the stability of atoms.
Nitrogen has an electron configuration of 1s2 2s2 2p3 in the ground state. However, when it accepts three electrons to form the stable nitride ion N^3-, its electron configuration becomes 1s2 2s2 2p6.
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A 5.00-kg ball, moving to the right at a velocity of +2.00 m/s on a frictionless table, collides head-on with a stationary 7.50kg ball. find the final velocities of the ball if the collision is elastic
Using the law of conservation of momentum and energy for an elastic collision, the final velocity of the 5.00-kg ball is -0.79 m/s (moving to the left), and the 7.50kg ball is 1.06 m/s (moving to the right).
Explanation:The problem essentially describes an elastic collision between two masses. Elastic collisions are those where the total kinetic energy of the system is conserved. Two important laws come into play here: The Law of Conservation of Momentum and the Law of the Conservation of Energy. The formulas associated with these laws are: m1*u1 + m2*u2 = m1*v1 + m2*v2 (momentum conservation) and 1/2m1*u1² + 1/2m2*u2² = 1/2m1*v1² + 1/2m2*v2² (energy conservation).
Given: m1 (mass of first ball) = 5kg, u1 (initial velocity of first ball) = 2m/s, m2 (mass of second ball)= 7.5kg, and u2 (initial velocity of second ball) = 0, we can solve for v1 and v2 (the final velocities of the two balls).
By doing the math, we find that v1 (final velocity of the first ball)= -0.79 m/s and v2 (final velocity of the second ball)= 1.06 m/s. Hence, after the collision, the 5.00kg ball will move to the left with a speed of 0.79 m/s, and the 7.50kg ball will move to its right with a speed of 1.06 m/s.
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The final velocities of the balls after the elastic collision can be determined by applying the principles of Conservation of Momentum and Conservation of Kinetic Energy. Formulas can then be combined to solve for the final velocities, v1f and v2f.
Explanation:A 5.00-kg ball, moving to the right at a velocity of +2.00 m/s on a frictionless table, collides head-on with a stationary 7.50kg ball. We are tasked with finding the final velocities of the balls following an elastic collision.
The following two principles will guide us: Conservation of Momentum and Conservation of Kinetic Energy. First, we apply the equation of Conservation of Momentum:
Initial momentum = Final momentum
(m1*v1i + m2*v2i) = (m1v1f + m2v2f).
For the first ball m1=5kg, v1i=2m/s and for the second ball m2=7.5kg, v2i=0.
The Conservation of Energy in an elastic collision can be represented by the equation:
Kinetic energy initial = Kinetic energy final
(0.5*m1*v1i^2 + 0.5*m2*v2i^2) = (0.5*m1*v1f^2 + 0.5*m2*v2f^2).
Combining the two equations can determine v1f and v2f. For an extended step-by-step solution, refer to a physics textbook or online resources offering detailed calculations for elastic collisions.
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Fish conservation zones extend as much as_____ from a nations’ coast.
100miles
200miles
300miles
Answer:
200 miles
Explanation:
Fish conservation zones extend as much as 200 miles from a nations' coast.
Coastal States exercising control over fisheries in the zone are naturally concerned that fishing vessels in their zones are merely passing through or are complying with applicable fishery regulations. This is to ensure that such vessels in transit do not engage in illegal fishing or otherwise violate fish conservation laws.
What is the acceleration of this object? The object's mass is 60 kg.
You move a 25 N object 5 meters. How much work did you do ?
The work done moving a 25 N object 5 meters is calculated by multiplying the force by the distance (25N x 5m), resulting in 125 Joules.
Explanation:In physics, the concept of work is defined as force applied times the distance the object is moved. In the case of your question, where you are moving a 25 N object a distance of 5 meters, the work done can be calculated using the formula Work = Force x Distance. So, here, the work done would be 25 N x 5 m = 125 N.m or 125 Joules.
Remember, in this context, the unit of work is expressed in Joules (J), which is equivalent to a Newton-meter (N.m).
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Describe Earth's three global wind belts
Final answer:
Earth's global wind belts, consisting of the Trade Winds, Westerlies, and Polar Easterlies, are formed by the unequal heating of the atmosphere and the Earth's rotation.
Explanation:
Earth's three global wind belts are crucial components of the planet's climate system and are largely responsible for the distribution of precipitation across different regions. The global wind belts are:
Trade Winds: These winds are found nearest to the equator and are characterized by their persistent direction towards the west in both hemispheres.Westerlies: Located in the mid-latitudes between 30° and 60° N and S, these winds predominantly flow towards the east.Polar Easterlies: Found in the polar regions close to the north and south poles, these winds flow outwards from the polar high-pressure areas towards lower latitudes.These wind belts are created due to the unequal heating of the Earth's atmosphere, with more solar radiation striking the equator than the poles, combined with the Earth's rotation which gives rise to the Coriolis effect. This results in a system of atmospheric circulation cells, which generate the prevalent wind patterns.
How far will a car travel, thatis moving at 20.00 m/s for 15.00 seconds?
In which direction does a magnetic force act on an electron that is moving in the positive x-direction in a magnetic field pointing in the positive z-direction?
A) any direction in the xy-plane
B) the negative y-direction
c) the negative x-direction
D) the positive y-direction
a particle with charge q is at rest when a magnetic field is suddenly turned on. The field
points in the z-direction. What is the direction of the net force acting on the charged particle?
a) In the z-direction.
b) There is no force on the particle.
c) In the y direction
d) In the x direction
Final answer:
The magnetic force acts in the negative y-direction for an electron moving in the positive x-direction in a field in the positive z-direction. A charge at rest experiences no force in a magnetic field. So the correct option is B for the first question and the correct option is b for the second question.
Explanation:
The direction of the magnetic force on an electron moving in the positive x-direction in a magnetic field pointing in the positive z-direction, according to the right-hand rule and considering the negative charge of an electron, would be in the negative y-direction. This can be visualized by pointing the palm of your right hand in the direction of the electron's velocity (positive x-direction), the fingers in the direction of the magnetic field (positive z-direction), and then flipping the direction because the charge is negative, giving us the force in the negative y-direction.
As for a static charge in a magnetic field, no magnetic force is exerted on a particle with charge q that is at rest when a magnetic field is turned on. A magnetic force only acts on moving charges, therefore the particle will experience no force.
On the basis of electronegativity, which of these pairs of elements is most likely to form monatomic ions?
K and Rb
Ba and Ca
Na and K
Cl and Na
What would happen if there was no condensation stage in the water cycle?
Which situations describe an elastic collision?
a. two glass marbles bounce off each other.
b. rodrick flops onto his sofa and sinks into the cushion.
c. a tossed water balloon flattens when it lands on the grass.
d. a bowling ball knocks over five pins.
Answer;
A. two glass marbles bounce off each other.
Explanation;
Elastic collisions are collisions in which both momentum and kinetic energy are conserved. The total system kinetic energy before the collision equals the total system kinetic energy after the collision. If total kinetic energy is not conserved, then the collision is referred to as an inelastic collision.
An elastic collision occurs when the two objects "bounce" apart when they collide. Two rubber balls are a good example. In an elastic collision, both momentum and kinetic energy are conserved. Almost no energy is lost to sound, heat, or deformation.
Final answer:
The situation that describes an elastic collision among the options given is two glass marbles bouncing off each other, as it aligns with the conservation of kinetic energy, which is characteristic of an elastic collision. Therefore, the correct option is a.
Explanation:
The question asks which situations describe an elastic collision. An elastic collision is characterized by the total kinetic energy of the objects involved being conserved post-collision. Among the given scenarios, two glass marbles bouncing off each other i.e. option a best exemplifies an elastic collision.
This is because, in theory, when two glass marbles collide, they do not lose any of their internal kinetic energy during the event, which is a hallmark of elastic collisions. This concept aligns with experiments that demonstrate the conservation of momentum and kinetic energy in collisions of hard objects with negligible energy loss through sound, heat, or deformation.
Other options, such as Rodrick flopping onto his sofa, a tossed water balloon flattening when it lands, and a bowling ball knocking over pins, describe scenarios where energy is not conserved in the same manner, indicating inelastic collisions. These cases involve significant energy transformation or absorption, such as into sound, heat, or deformation, which does not align with the properties of elastic collisions.