Answer:
The answer is 2.84 eV
Explanation:
An electron in a mercury atom drops from energy level f to energy level c by emitting a photon having an energy of 2.84eV.
What is mercury?Mercury is known to be a type of naturally-occurring chemical element that has been discovered in rock that is found in the earth's crust.
They can be found as a form of deposits of coal. On the periodic table, it symbol is "Hg" and it has about 80 atoms. It can be found as Elemental (metallic) mercury, Inorganic mercury compounds, etc.
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Calculate the wavelength of an electron mass 9.1*10^-31kg moving with a velocity of 2.0*10^6m/s (h=6.63*10^-34Js) (Hint: De Broglie's wavelength)
Answer:
Wavelength, [tex]\lambda=3.64\times 10^{-10}\ m[/tex]
Explanation:
We have,
Velocity an electron is [tex]2\times 10^6\ m/s[/tex]
Mass of an electron is [tex]9.1\times 10^{-31}\ kg[/tex]
It is required to find the wavelength of electron. The De-Broglie wavelength of an electron is given by :
[tex]\lambda=\dfrac{h}{mv}[/tex]
h is Planck's constant
[tex]\lambda=\dfrac{6.63\times 10^{-34}}{9.1\times 10^{-31}\times 2\times 10^6}\\\\\lambda=3.64\times 10^{-10}\ m[/tex]
So, the wavelength of an electron is [tex]3.64\times 10^{-10}\ m[/tex].
What is the momentum of a bowling ball with a mass of 8.9 and a speed of 6.0 m/s
Answer:
53 kg m/s
Explanation:
Momentum = mass × velocity
p = mv
p = (8.9 kg) (6.0 m/s)
p = 53.4 kg m/s
Rounded to 2 significant figures, the momentum is 53 kg m/s.
9. A ball is thrown straight up with an initial speed of 30 m/s. How long will it take to reach the top of its trajectory, and high will the ball go?
Answer:
1.) Time t = 3.1 seconds
2.) Height h = 46 metres
Explanation:
given that the initial velocity U = 30 m/s
At the top of the trajectory, the final velocity V = 0
Using first equation of motion
V = U - gt
g is negative 9.81m/^2 as the object is going against the gravity.
Substitute all the parameters into the formula
0 = 30 - 9.81t
9.81t = 30
Make t the subject of formula
t = 30/9.81
t = 3.058 seconds
t = 3.1 seconds approximately
Therefore, it will take 3.1 seconds to reach to reach the top of its trajectory.
2.) The height it will go can be calculated by using second equation of motion
h = ut - 1/2gt^2
Substitutes U, g and t into the formula
h = 30(3.1) - 1/2 × 9.8 × 3.1^2
h = 93 - 47.089
h = 45.911 m
It will go 46 metres approximately high.
If the billing cycle length for a credit card is one calendar month, which of the
following months will result in the greatest periodic interest rate?
O A. December
B. June
C. April
!!!2O D. September
Answer: A.) December
Explanation:
December has the highest number of days in the options given above, with 31 days compared to the others with 30 days within a calendar month. The billing cycle is used to refer to a time interval between the end and the next billing or statement date. In the scenario above, the billing cycle length is monthly, meaning the periodic interest will be paid over a 31 day span time before thre beginning of another cycle.
For example, if periodic interest is $1 per day, this amount totals ($1 × 31) in december compared to the ($1 × 30) Interest in the June, April and September billing cycle.
a bicycle coasts along a flat road. what form of energy does it best demonstrate
Answer:
Kinetic energy
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Which statement best explains acceleration?
O A.
It is the total distance covered over a period of time.
B.
It is a change in velocity over a period of time.
Oc.
It is a change in displacement over a period of time.
OD.
It is a change in direction over a period of time.
Answer:
It is a change in velocity over a period of time.
Explanation:
It is measured in metres/second2 using an accelerometer.For a reaction to occur what must happen to the energy in order to break the chemical bond
A ball rolls with a speed of 4.0 m/s across a level table that is 1.0 m above the floor. Upon reaching the edge of the table, it
follows a parabolic path to the floor. How many meters along the floor is the landing spot from the table?
Answer: 1.81m
Explanation:
Given the following:
Horizontal speed = 4m/s
Height of table = 1m
Taking the vertical component of the motion:
Using:
S = ut + 0.5 at^2
Where, S = height of table, a = acceleration due to gravity (9.8m/s^2), t = time and u = Initial Velocity in vertical direction = 0
1 = 0(t) + 0.5(9.8)t^2
1 = 4.9t^2
t^2 = 1 / 4.9
t^2 = 0.204081
t = sqrt(0.204081)
t = 0.452s
For Horizontal :
Gravitational acceleration is absent, therefore distance can be calculated using:
Distance = Velocity × time
Distance = 4m/s × 0.452s
Distance = 1.808 m
Distance = 1.81m
which type of circuit is shown?
A. closed series circuit
B. closed parallel circuit
C. open parallel circuit
D. open series circuit
Answer:
I think it's D. open series circuit .
Explanation:
hope it helps you!
8. How does the direction of friction compare to an object's direction of motion?
Answer: The direction of the force of friction is such that it opposes the direction of motion that an object would move if there were no frictional force acting on the object.
The direction of motion and direction of friction have to be in opposite directions for a object to be in motion.
What is motion?Motion is defined as a phenomenon which is described with respect to change in object's position with respect to time.It is given in terms of displacement,velocity,distance ,acceleration,speed.
Branch of physics which deals with motion of objects without any reference to it's cause is called kinematics while the branch which studies forces and their effects on motion is called as dynamics.
Motion applies to various systems like objects,bodies, matter particles ,radiation ,curvature.There are three laws of motion which are proposed by Newton.Classical mechanics is based on Newton's law of motion.Relativistic mechanics is based on modern kinematics.
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How does the value of the electrostatic force vary with the value (how many) of the charges?
Answer:
Electrostatic force is directly proportional to the amount of charge on each body under consideration.
Electrostatic force increases with increase in charge.
Electrostatic force decreases with decrease in charge.
Explanation:
Electrostatic force is the force between 2 charges which can be explained by the Coulomb's Law:
F= K (q₁)(q₂)/r²
Where
F= Electrostatic Force
K = Constant of Proportionality
(q₁) and (q₂) = Amount of charge on each body
r = Distance between two bodies carrying charge
If the value of (q₁) or (q₂) is increased considering the other factors remain constant, the value of F will also increase.
And vice versa.
How does the velocity change with time in uniform rectilinear motion of an object?
1/25 force of gravity in distance
Answer: 25
Explanation:
What is the mass of an object that has a weight of 80.0 N?
Explanation:
SUPONIENDO QUE LA ACELERACIÓN DE LA GRAVEDAD ES [tex]9.80 m/s^{2}[/tex]
USANDO LA SEGUNDA LEY DE NEWTON:
m = 80.0 N/[tex]9.80 m/s^{2}[/tex] = 8.16 kg
Answer:
8kg
Explanation:
using the formula Force(F)=mass(m)×acceleration(a),
since we are finding the mass of the object,we will make m the subject by dividing both sides by a.
you will now get m= f/a
the acceleration on Earth is usually 10m/s
m= 80/10
m= 8/1 which is also 8kg
All engines operate at less than 100 percent efficiency because they
A. absorb heat
B. conduct heat
C. burn gasoline
D. emit heat
Answer:
It is B or D, but I may be leaning a little more towards D.
Explanation:
Give a specific example of a vector quantity. Explain why this type of quantity would be used to describe this event.
Answer:
Vector Quantities Increase/Decrease in Temperature - The measurement of the medium's temperature is a scalar quantity; the measurement of the increase or decrease in the medium's temperature is a vector quantity. Velocity - The measurement of the rate at which an object changes position is a vector quantity.
Explanation:
Answer: velocity has a magnitude and a direction. This quantity is useful in every day lives in many ways. for example when you are driving in a car, its good to know the velocity in which the car is going.
Explanation: sorry its late
ANSWER QUICK 40 POINTSSSS
QUESTION 6
Why are the moon’s craters preserved?
A)The moon is windy.
B)There are tectonic plates shifting on the moon.
C)Water preserves them.
D)There are no longer live tectonics occurring on the moon.
QUESTION 7
Why do you see only one side of the moon from Earth?
A)The moon does not rotate.
B)The moon takes longer to rotate than to revolve around Earth.
C)The moon takes less time to rotate than to revolve around Earth.
D)The moon’s period of rotation and revolution are equal.
QUESTION 8
What is the best description of the side of the moon that faces Earth?
A)random
B)The same
C)goes through cycles
D)changes
QUESTION 9
In what position are the moon, the earth, and the sun during the first quarter moon?
A)The moon is between the sun and the earth.
B)Earth is between the sun and the moon.
C)The sun is between the earth and the moon.
D)The moon is to the side of the earth and the sun.
Answer:
For 6 its D
For 7 its A
For 8 its C
For 9 I think its B but Im not sure
When transferring electric charge, an object becomes negative when it
a) loses protons
b) gains electrons
OC) loses electrons
d) gains protons
e)
a and d are correct
Answer:
b) gains electrons
Explanation:
When transferring electric charge, an object becomes negative when it gains electrons
Write down the equation that links energy transferred, charge flow, and
potential difference.
Answer:
The description of the given scenario is described in the explanation segment below.
Explanation:
As a charge passes through some kind of potential gap, the electrical task is undertaken as well as energy will be transferred. The Potential difference seems to be an amount of work performed per unit charge and is denoted by "V" as well as a charge is denoted by "Q".The energy transferred could be determined by using the following equation or formula:
⇒ Energy transferred = charge × potential difference
The equation that links energy transferred, charge flow, and potential difference (voltage) is: [tex]E = qV[/tex]
In Science, when a potential difference (voltage) is applied on an object, it gains some potential energy, which is then converted to kinetic energy.
The kinetic energy possessed by the object is responsible for the movement of electrons from one point to another in an electric field.
Hence, the quantity of energy in an electric circuit is directly proportional to the charge and potential difference (voltage) applied on the object.
Mathematically, the energy transferred in an electric field is given by the formula:
[tex]E = qV[/tex]
Where:
E is the energy transferred.q is the charge.V is the potential difference.Read more: https://brainly.com/question/23153766
If you divide a speed in miles per minute by 60, you get the same speed
expressed in miles per
Answer here
Isabela is an astronomer studying stars A and B. Star A is farther away from Isabela and yet when Isabela observes the stars, the stars appear to have the same brightness. Which would be the best explanation for this? The stars have the same luminosity. Star A is more luminous than star B. Star B is more luminous than star A.
Answer: star A is more luminous
Explanation:
Answer:
B. Star A is more luminous than star B.
Explanation:
on edg
A golfer is teeing off on a 130.0 m long par 3 hole. The ball leaves with a velocity of 35.0 m/s at 35.0° to the horizontal. Assuming
that she hits the ball on a direct path to the hole, how far from the hole will the ball land (no bounces or rolls)?
Answer:
The ball will land 12.5m before that hole.
Explanation:
The motion of the golf ball can be considered as a projectile motion, where first its height is 0, then it keeps increasing to a maximum point, after which its height starts decreasing again and hits the ground (height becomes 0 again).
We need to calculate the Range (horizontal distance) of the ball which is given as:
[tex]R=\frac{v_i^2{\cdot}sin2\theta}{g}[/tex]
Where
v(i) = initial velocity = 35 m/s
θ = Initial angle = 35°
g = gravitational acceleration = 9.8 m/s
Substitute in the given formula to find Range:
[tex]R=\frac{(35)^2\cdot{sin}(2)(35)}{9.8}\\R=\frac{(1225)(0.94)}{9.8}\\R = 117.5~m[/tex]
Distance between the hole and position where ball lands = 130m - 117.5m = 12.5m
A negative slope on the velocity vs. time graph indicates that the object is not
accelerating
A. True
B. False
Answer: False, I think
Explanation:
Well it depends. Its hard to say without a function of the graph. Given a velocity graph, the first derivative is the acceleration.
Negative slope on a velocity graph means you are going in the negative direction. And over time, your velocity per unit of time is also decreasing. That means we are accelerating in the negative direction
1. A force that pushes forward on an object speeds the object up. A force that pushes backwards slows
the object down. What effect does a force that is perpendicular to the object's motion do?
Answer:
If pushing forward speeds it and pushing backward slows it down then force perpendicular to the object will keep it stationary and resist it's motion
Explanation:
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A girl is out jogging at 2.00 m/s and accelerates at 1.50 m/s^2 until she reaches a velocity of 5.00 m/s. How far does she get?
Answer:
7.00 m
Explanation:
Given:
v₀ = 2.00 m/s
v = 5.00 m/s
a = 1.50 m/s²
Find: Δx
v² = v₀² + 2aΔx
(5.00 m/s)² = (2.00 m/s)² + 2(1.50 m/s²)Δx
Δx = 7.00 m
A pot of water is boiled on a stove. Which of the following definitions of the system enables the most straightforward thermodynamic analysis of the process
A. The system is the pot and water.
B. The system is the stove, pot, and water.
C. The system is the building containing the stove.
D. The system is the entire Universe.
Answer:
A. The system is the pot and water.
Explanation:
Thermodynamics is an aspect in science which deals with the applications of heat energy. The useful applications of heat energy to perform work.
In the given question, the pot and water is the system which both absorbs heat energy from the stove. Thus, the system is a closed system since it shares heat energy with its surroundings.
The surrounding of the system extends from the boundary of the pot to the universe.
Electric circuit questions,,, plz help me
Calculate the wavelength of a nitrogen molecule moving at a speed of 523m/s.
Answer:
The de-Broglie wavelength of the nitrogen molecule is 0.0272 nm
Explanation:
The mass, m, of the nitrogen molecule, N₂ = 14.0076u = 28.0152 × 1.66 × 10⁻²⁷ kg
[tex]v_{rms}[/tex] of N₂ = 523 m/s
The de-Broglie wavelength is given as follows;
[tex]de-Broglie \, wavelength = \dfrac{h}{m\times v_{rms}}[/tex]
Where:
h = Planck's constant = 6.62607004 × 10⁻³⁴ m²·kg/s
Plugging in the values, we have;
[tex]de-Broglie \, wavelength = \dfrac{6.62607004 \times 10^{-34}}{28.0152 \times 1.66 \times 10^{-27}\times 523} = 2.72\times 10^{-11} \, m[/tex]
Hence, the de-Broglie wavelength of the nitrogen molecule = 0.0272 nm.
1. What is the inductance of a series RL circuit in which R= 1.0 K ohm if the current increases to one-third of
its final value in 30 micro s?
Answer: the answer is C its in the book
Explanation:
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Use scientific evidence to outline how the Big bang theory can be used to explain the origin of the universe and its age.
Answer:
The widely accepted theory for the origin and evolution of the universe is the Big Bang model, which states that the universe began as an incredibly hot, dense point roughly 13.7 billion years ago.