A laser produces 20.0 mW of red light. In 1 hour, the laser emits 2.29 X 10^20 photons. What is the wavelength of the laser?
A high school physics student is sitting in a seat reading this question. The magnitude of the force with which the seat is pushing up on the student to support him is closest to what?
Answer:
Force due to seat must be equal to the Weight of the student
Explanation:
As we know that the student is sitting on the seat at rest
So here we can say that at this position the student must be at equilibrium position
so we can write force equation for this position of student
vertically downward the net force is due to his/ her weight which is given as
[tex]W = mg[/tex]
now this weight of the student is counter balanced by the the normal force due to seat which is in opposite direction
Now for equilibrium position of the object we will have
[tex]F_n = mg[/tex]
so the seat will push the student upwards by force which is equal to the weight.
To calculate the wavelength of a wave, take the wave speed and divide by the frequency of the wave. true or false
The electromagnetic waves that have the lowest frequency is called
The electromagnet in a galavanometer.
a. increases the voltage in a circuit.
b. moves a pointer along a numbered scale in response to a current.
c. induces an electric current.
d. increases the current in a circuit.
An airplane is heading due south at a speed of 600 km h. If a wind begins blowing from the
southwest at a speed of 100 km h (average), calculate: (a) the velocity (magnitude and direction) of the plane relative to the ground ...?
To calculate the velocity of the plane relative to the ground, add up the x and y components of the plane's velocity and the wind velocity. Find the magnitude and direction of the resultant velocity using the Pythagorean theorem and trigonometry.
Explanation:To calculate the velocity of the plane relative to the ground, we need to consider the vector sum of the plane's velocity and the wind velocity. We can break down the velocity vectors into their x and y components. The plane's velocity is due south, so its x component is 0 km/h and its y component is -600 km/h. The wind velocity is blowing from the southwest, which can be represented as 45 degrees south of west. Its x component is -100*cos(45) km/h and its y component is -100*sin(45) km/h. Now we can add up the x and y components to find the resultant velocity vector. The x component is 0 + (-100*cos(45)) km/h and the y component is -600 + (-100*sin(45)) km/h. Finally, we can find the magnitude and direction of the resultant velocity vector using the Pythagorean theorem and trigonometry. The magnitude is sqrt(x^2 + y^2) km/h and the direction can be found using the arctan(y/x) function.
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Which of these is a source of voltage?
a. a battery
b. a generator
c. an electrical outlet
d. all of these are voltage sources.
does centripetal force change in uniform circular motion?
The centripetal force in uniform circular motion remains constant as long as the object's mass and velocity don't change, since centripetal force is calculated as the mass times centripetal acceleration (Fc = mac).
In uniform circular motion, the centripetal force must remain constant to maintain the motion. The second law of motion given by Newton states that net force is mass times acceleration: net F = ma. We have centripetal acceleration (a = ac) for uniform circular motion, and consequently, Fc, the magnitude of centripetal force is Fc = mac. This equation implies that as long as the mass of the object and its velocity (which together determine ac) remain constant, the centripetal force will also remain constant. It is this force that maintains the object in a circular path, acting towards the center of curvature and altering the direction of the object without changing its speed.
It's important to note that centripetal force is not a particular type of force; rather, it could be provided by any force or combination of forces that act towards the center of the object's circular path, like gravitational force, tension, friction, or any other appropriate force that can cause the required centripetal acceleration for uniform circular motion.
he graph below shows the velocity f(t) of a runner during a certain time interval:
graph of line going through ordered pairs 0, 4 and 4, 8. Graph of another line going through ordered pairs 4, 8 and 8, 0. Label on the x axis is time in second and label on the y axis is velocity in meter per second
Which of the following describes the intercepts on the graph?
The initial velocity of the runner was 4 m/s, and the runner stopped after 8 seconds.
The initial velocity of the runner was 8 m/s, and the runner stopped after 4 seconds.
The initial acceleration of the runner was 4 m/s2,
Answer is "the
initial velocity of the runner was 4 m/s, and the runner stopped after 8
seconds".
This is a velocity - time graph.
At t = 0 s, the graph
has a velocity as 4 m/s. This means,
the runner has an initial velocity as 4 m/s.
At t = 4 s, the runner
has reached his maximum velocity as 8 m/s and acceleration is 1 m/s².
After t = 4 s, the velocity has decreased with the
time means it is a negative acceleration.
At t = 8 s, the velocity of the runner has reached to zero means runner
has stopped after 8 seconds.
A blank is any disturbance that carries energy from one place to another through matter and space.
A wave
A wave is any form of a disturbance that carries energy from one place to another through a matter and space
Explanation;Waves carry energy from one point, the source to another point or place. The transmission of a wave may occur through the space or through a material medium. Electromagnetic waves are those waves whose transmissions occurs through the space, they do not require material medium for transmission,for example, radio waves, while mechanical waves are those that require material medium for transmission, for example sound waves.The energy of wave depends on the frequency of the wave and the wavelength of that particular wave.Explanation:
A wave is a disturbance that carries energy from one place to another through matter and space.
When we through a stone or a pebble in calm water, then the particles of water moves up and down and this process continues for some time. This implies that there is a disturbance produced in water.
The wave can be described using second-order linear partial differential equation. It is termed as wave equation.
There are many types of waves like the transverse wave and the longitudinal waves.
Which of the following is the best definition of an isotope?
A. elements of the same kind with different numbers of neutrons
B. elements of the same kind that have lost electrons
C. elements of the same kind that have different electrical charges
...?
Answer:
A. elements of the same kind with different numbers of neutrons
Explanation:
As we know that an atom is represented by
[tex]_z^AX[/tex]
here we know that
z = atomic number
A = atomic number + number of neutrons
now if the number of neutrons in an atom is different but having same number atomic number then the combination of such group of atoms is known as isotopes.
So here we have
[tex]_z^{A_1}X, _z^{A_2}X[/tex]
so above is the example of isotopes
If a loaded truck that can accelerate at 2 m/s2 loses its load and has one-third of its original mass, what acceleration can it attain if the same driving force acts on it?
Answer:
a₂ = 6 m/s²
Explanation:
Conceptual Analysis
We apply Newton's second law:
F=m*a Formula (1)
m: mass in kilograms (kg)
a: acceleration (m/s²)
F: force in Newtons (N)
Known Data
a₁ = 2 m/s²
m₁= m
m₂= (1/3)m
Problem development
We apply formula (1) for the two conditions given:
F₁ = m₁*a₁ = m*2
F₂ = m₂*a₂= (1/3)m*a₂
F₁ = F₂
m*2 = (1/3)m*a₂ We divide by m on both sides of the equation
2 = (1/3)*a₂
6 = a₂
a₂ = 6 m/s²
In which situation would you see a partial lunar eclipse ?
A.the entire moon passes through earth shadow
B.the moon passes between earth and the sun
C.a portion of the moon passes through earths shadow
D.the moon lies completely outside of earths shadow
Answer: The correct answer is Option C.
Explanation:
Lunar eclipse is defined as the condition which arises when moon passes behind Earth to its shadow.
Partial lunar eclipse arises when a portion of moon passes through Earth to its shadow and total lunar eclipse arises when moon passes directly behind Earth's shadow.
Hence, the correct answer is Option C.
ATP molecules store cellular energy. When phosphate groups are removed and molecules of ADP are formed, energy is released. This energy can be used to perform
...?
The energy released from ATP molecules breaking down into ADP is used for various cellular functions like muscle contraction, transportation of substances, synthesis of biological molecules, and maintaining body temperature.
Explanation:When ATP molecules break down into ADP (adenosine diphosphate), the process releases energy. This energy finds use in various cellular functions, including muscle contraction, active transport of substances across cell membranes, synthesis of biological molecules, and maintaining body temperature. Essentially, an ATP molecule releases energy when it loses a phosphate group, and this energy powers biological processes requiring energy inside a cell.
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ATP molecules store energy that is released when converted to ADP and is used to perform cellular work. This energy is essential for processes such as muscle contraction and active transport in cells. The correct answer is D. cellular work.
ATP molecules play a crucial role in storing and providing energy for cellular work.
When ATP is broken down into ADP and an inorganic phosphate, energy is released and can be used for various cellular processes. This energy release is critical for activities like muscle contraction, active transport in cell membranes, and chemical reactions within the cell.For example, in muscle cells, the energy from ATP is used to move contractile proteins that enable muscle contraction. In cellular transport, ATP is vital for the function of the sodium-potassium pump, which maintains the cell's electrochemical gradient by actively transporting ions against their gradients.Correct answer is D. cellular work.
complete question:
ATP molecules store cellular energy. When phosphate groups are removed and molecules of ADP are formed energy is released. This energy can be used to perform?
A. osmosis
B. electron transport
C. diffusion
D. cellular work
A girl delivering newspapers covers her route by traveling 2.00 blocks west, 3.00 blocks north, and then 7.00 blocks east.
(a) What is her resultant displacement?
____blocks at ____° north of east
(b) What is the total distance she travels?
____blocks ...?
Jack tries to place magnets on the door of his refrigerator. He observes that the magnets don’t stick. He guesses that the door of the refrigerator is made of a nonmagnetic substance. What stage of scientific investigation does his guess represent?
Answer:
Constructing a Hypothesis
Explanation:
Jack already made his observation (magnet doesnt stick). After that Jack then guesses that the fridge was made of nonmagnetic substance. Now he must construct a hypotesis.
Explain the difference between the degree measure of an arc and its arc length ...?
what force is needed to give a 0.25-kg arrow an acceleration of 196 m/s^2A. 0.25 NB. 49 NC. 748 ND. 196 N
F = 49N
I Took The Test!
It is important to maintain septic systems in order to
The distance "d" you bike varies directly with the amount of time "t" you bike. Suppose you bike 13.2 miles in 1.25 hours. What is an equation that relates "d" and "t"? What is the graph of the equation? ...?
The equation relating distance "d" and time "t" is d = 10.56t. This equation represents a direct variation between distance and time, where 10.56 is the constant of variation. The graph of this equation is a straight line passing through points (0,0) and (1.25, 13.2).
Explanation:The distance "d" you bike varying directly with the amount of time "t" you bike suggests a linear relationship. This can be represented as d = kt, where "k" is the constant of variation, representing the rate you bike per hour. From the provided information, we know that if you bike for 1.25 hours, you travel 13.2 miles. That means k = d/t = 13.2 / 1.25 , which equals 10.56. So the equation relating "d" and "t" is d = 10.56t.
To graph this equation, you would plot time on the x-axis and distance on the y-axis. Begin by plotting a point at (0,0). Then plot a second point at (1.25, 13.2) as given. Draw a line through these points. The slope of this line is 10.56, which verifies our equation. This:
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The height, h, of a falling object t seconds after it is dropped from a platform 300 feet above the ground is modeled by the function h(t)=300-16t^2 Which expression could be used to determine the average rate at which the object falls during the first 3 seconds of its fall?
A.) h(3) – h(0)
B.) h(3/3)-h(0/3)
C.) h(3)/3
D.) (h(3)-h(0))/3
The average rate at which the object falls during the first 3 seconds of its fall is [tex]\frac{h(3) - h(0)}{3}[/tex].
Model of the object's motionThe function of the object's motion is given as h(t) = 300 - 16t².
Velocity of the object after 3 secondsThe velocity at which the object falls during the first 3 seconds of its fall is calculated as follows;
[tex]v = \frac{dh(t)}{dt} = -32t[/tex]
Average rateThe average rate of the motion is calculated as follows;
[tex]v = \frac{h(3) - h(0)}{3}[/tex]
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Answer:
D
Explanation:
The stars and planets are made of _______.
A. dark energy
B. dark matter
C. baryonic material
The ice in his drink has a mass of 6 g and a volume of 20 cm3. what is the density of the ice?
If a 60-watt bulb is used to light a room, how much current is flowing through the bulb given that the voltage is 120 volts?
The current flowing through a 60-watt bulb with a voltage supply of 120 volts is calculated using the equation I = P/V, which yields a result of 0.5 amperes.
To calculate the current flowing through a 60-watt bulb given a voltage of 120 volts, we can use Ohm's Law and the power equation. The power equation is P = IV, where P is power in watts, I is current in amperes, and V is voltage in volts.
First, we need to rearrange the equation to solve for the current I. Doing so, we get I = P/V. By substituting the given values, we have I = 60 W / 120 V. Therefore, I = 0.5 A.
The result shows that a current of 0.5 amperes (0.5 A) is flowing through the 60-watt bulb when it is connected to a 120-volt power supply.
If a constant force acts on two objects of different masses, which object will accelerate more?
a. the larger object
c. both objects will respond in the same way
b. the smaller object
d. the larger object will speed up, but the smaller object will slow down
Answer:
b. the smaller object
Explanation:
According to Newton's second law, when a force is applied to an object, it accelerates. This acceleration is proportional to the intensity of the applied force and is inversely proportional to the mass that moves. Therefore, the lower the mass, the greater the acceleration.
You plan a car trip for which you want to average 90 km/h. You cover the first half of the distance at an average speed of only 48 km/h. What must your average speed be in the second half of the trip to meet your goal?
Final answer:
The average speed for the second half of the trip needs to be 90 km/h.
Explanation:
To find the average speed you need to consider the total distance and total time.
In this case, let's assume the total distance is d kilometers. So, the first half of the distance is d/2 kilometers.
The first half is covered at an average speed of 48 km/h, which means it takes (d/2) / 48 hours to cover the first half.
To meet the goal of averaging 90 km/h for the entire trip, the average speed for the second half needs to be enough to cover the remaining distance (d/2) with the remaining time (d/2) / 90 hours.
Therefore, the average speed for the second half of the trip needs to be 90 km/h.
an object is in circular motion. how will the object behave if the centripetal force is removed?
a . it would move in a line away from the circle
B. it would move in a line toward the circles center
C. it would move in a curbed , circular path
B. it would move in a line tangent to the circular path
The correct answer is
B. it would move in a line tangent to the circular path
In fact, the centripetal force is the only force that keeps the object in a circular trajectory, pulling the object towards the centre of the circle. When this force is removed, there are no other forces acting on the object, therefore for the law of inertia, the object will continue to move at constant velocity, therefore in the same direction (tangent to the circular path) at constant speed.
The electron configuration of an element is 1s22s22p63s23p64s1. Why is this a REPRESENTATIVE element?
Answer:
D) The highest s-orbital or p-orbital is partially filled.
Explanation:
The element with electronic configuration The electronic configuration of an element is 1s22s22p63s23p64s1 has a partially filled s-orbital. This is typical of a representative element. In a representative element the highest s-orbital or p-orbital is partially filled.
Crystals can have _____ bonds between their atoms.
ionic
covalent
metallic
all types of
All types of
Crystals can have all types of bonds between their atoms.
Explanation;Crystals are solid materials which contains atoms, molecules or ions that are arranged in a complex structure forming a crystal lattice.Crystals may have all types of bonds, these includes; ionic bonds, formed as a result of transfer between a metallic bond and a non-metal atom, Covalent bond, formed as a result of sharing electrons between non metal atoms, hydrogen bonds, metallic bonds Van der Waals bonds, etc.What does the physics equation EF=0 mean?
Equation ΣF=0 refers total force applied on the body is zero. The forces acting on a body are referred to as balanced forces when the sum of all the forces acting on the body equals zero.
What is force?The definition of force in physics is: The push or pull on a massed object changes its velocity.
An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.
Equation ΣF=0 refers total force applied on the body is zero.
The forces acting on a body are referred to as balanced forces when the sum of all the forces acting on the body equals zero.
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Your question is incomplete. But most probably, the question was:
What does the physics equation ΣF=0 mean?