Answer:
Explanation:
The amplitude of resultant wave as the result of overlap of two waves depends upon the phase difference between the two. If the waves meet crest to trough , the phase difference is 180 degree or they are in opposite phase . Hence they will destroy each other . The amplitude of resultant wave can be obtained by subtracting the amplitudes of two waves. They will interfere destructively.
Amplitude of resultant gives waves = 4.6 - 2 = 2.6 cm.
Two magnets are held apart. Once released, the south pole of one magnet moves toward the north pole of another magnet until the magnets collide. How does the graph reflect the changes in energy that occur?
(1 point)
Kinetic energy is at its peak when the magnets are first released, then it decreases steadily. Energy stored in the magnetic field becomes zero.
The kinetic energy of the system is derived from the thermal energy created by increased velocity. Energy stored in the magnetic field does not change.
Kinetic energy and velocity are at zero when the magnets are held apart, and both increase rapidly when they are released and move together. Energy stored in the magnetic field decreases.
Graph for the two magnets held apart, kinetic energy is highest when the magnets first released, then it decreases steadily. Energy stored in the magnetic field becomes zero.
What is magnetic field?The magnetic field is the field in the space and around the magnet in which the magnetic field can be filled.
Magnetic force is the force of attraction or repulsion between two poles of the two magnets. The magnetic force is also appearing between two electrically charged bodies.
Two magnets held apart. Once released, the south pole of one magnet moves toward the north pole of another magnet until the magnets collide.
The graph reflection of kinetic energy of magnet -
When the two magnets are held apart, then the these magnets are at rest and do not possess any kinetic energy.When, the magnets released, then they started to move each other due to the magnetic force of attraction of opposite poles. Therefore, the kinetic energy between two magnets started to increase with the highest speed.Now, as they started to move towards each other, this speed started to reduced and become zero when they meat each other. Here at this point the energy stored in the magnetic field becomes zero.Therefore, graph for the two magnets held apart, kinetic energy is highest when the magnets first released, then it decreases steadily. Energy stored in the magnetic field becomes zero.
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A train crosses a bridge that is 1300 m long in 1 minute and 5 seconds.
What is the speed of the train in m/s?
Answer:
I'm pretty sure it's 20m/s because 1300m divided by 65 seconds is 20 so I think it's 20m/s
Explanation:
PLEASE HELP, NO ONE IS HELPING MEEEE :(
While taking the stairs it takes you 10 seconds to reach the top. The next time you take the same stairs, it takes you 5 seconds to reach the top stair. During which of these trips up the stairs did you use more power to climb?
Answer:
probably the trip where it took u 5 seconds
1. Which point(s) represent the maximum kinetic energy?
2. Which point(s) represent a zero kinetic energy?
3. Which point(s) represent the maximum potential energy?
4. Which point represents the maximum displacement on the right side?
5. If the distance from P to R takes 1 second, What is the distance from ap to Q?
1. R
2. P and Q
3. P and Q
4. Q
5. 2 seconds
Wait have a diagram to explain better. It's attached above.
The data table shows the sound levels of common noise sources.
A 2 column table with 13 rows. Column 1 is labeled sound in decibels with entries 140, 130, 120, 110, 100, 90, 80, 70, 60, 50, 40, 30, 20. Column 2 is labeled noise source with entries jet engine at 25 meters, jet aircraft at 100 meters, rock and roll concert, pneumatic chipper, woodworking machines, chainsaw, heavy truck traffic, business office, conversational speech, library, bedroom, secluded woods, whisper.
Which profession has the greatest risk of sound damage to the ear?
woodworker
librarian
teacher
truck driver
Answer: woodworker
Explanation: just took it
Based on the data table, the profession with the greatest risk of sound damage to the ear is likely to be a woodworker. The correct option is A.
What is a sound wave?Sound waves are a type of longitudinal wave that travels through a medium, such as air or water, and is caused by the vibration of particles in the medium. When an object vibrates, it creates a disturbance in the surrounding particles, which in turn creates a wave of pressure changes that propagates through the medium. These pressure waves can be detected by our ears and perceived as sound.
The characteristics of sound waves include frequency, wavelength, amplitude, and velocity. Frequency refers to the number of cycles of the wave that occur per second and is measured in Hertz (Hz). Wavelength refers to the distance between two consecutive points in a wave that are in phase with each other. Amplitude refers to the maximum displacement of the particles from their equilibrium position and is related to the loudness of the sound. Velocity refers to the speed at which the wave travels through the medium and is dependent on the properties of the medium, such as its density and stiffness.
Sound waves are used in many applications, including communication, music, medical imaging, and sonar.
Here in the question,
Woodworking machines produce a sound level of 90 decibels, which is considered to be hazardous to hearing with prolonged exposure. Librarians, teachers, and truck drivers are not listed as noise sources in the table and their risk of sound damage would depend on their specific work environment and exposure to noise.
Therefore, According to the data table, the profession with the highest risk of ear damage is likely to be woodworker.
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Which two options describe physical properties of matter?
A. Whether a substance floats or sinks in water
B. Whether a substance tarnishes
C. The ability of a substance to combine with other substances
D. The temperature at which a substance boils
E. Whether a substance can be burned
Answer:
A. (Buoyancy) and D. (Temperature)
Explanation:
I took itttttttttttttttt
The physical properties of matter are A and D.
What are the properties of matter?
Those who have mass and occupy space are called matter.those are residences together with mass, weight, quantity, and density. Density calculations can be mentioned in a while in chapter 3, however for now just remember the fact that density is a physical property. physical houses that do not depend on the amount of substance present are called extensive residences.
Among the following the properties of matter are:-
A. Whether a substance floats or sinks in water.
D. The temperature at which a substance boils.
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What role does math play in physics?
Answer:
To provide mathematical models for describing physical reality.
1.
A 50 kilogram person carries a 20 newton can to the top of a
3.0 meter high ladder and then drops it to the floor.
Calculate the potential energy of the can when it is
at the top of the ladder.
a.
[801)
b. Determine the kinetic energy of the can when it is
1.0 meter above the floor.
Answer:
Potential Energy = 147Joules
KE = 490Joules
Explanation:
1) Potential Energy = mgh
Mass m = 50kg
g = 9.8m/s^2
height h = 3.0m
Potential = 50*9.8*3
Potential Energy = 147Joules
2) KE = 1/mv^2
Get the velocity
v² = u²+2gh
v² = 0²+2(9.8)(1.0)
v² = 19.6
v = √19.6
v = 4.43m/s
KE = 1/2 * 50 *4.43²
KE = 25 * 19.6
KE = 490Joules
Hence the kinetic energy is 490Joules
(a) The potential energy of the can when it is at the top of the ladder is 1470 J.
(b) The kinetic energy of the can when it is 1.0 meter above the floor is 488.41 J.
Given data:
The mass of the person is, m = 50 kg.
The weight carried by the person is, W = 20 N.
The vertical height of ladder is, h = 3.0 m.
(a)
The energy possessed by an object by virtue of its position is called potential energy. The expression for the potential energy is given as,
[tex]PE = mgh[/tex]
here, g is the gravitational acceleration.
Solving as,
[tex]PE = 50 \times 9.8 \times 3.0\\\\PE = 1470 \;\rm J[/tex]
Thus, the potential energy of the can when it is at the top of the ladder is 1470 J.
(b)
And the kinetic energy is the energy of object by virtue of motion. And its expression is,
[tex]KE = \dfrac{1}{2} mv^{2}[/tex]
Here, v is the velocity of can.
Now, at 1 m height, its velocity is calculated as,
[tex]v^{2}=u^{2}+2gh\\\\v^{2}=0^{2}+2 \times 9.8 \times 1.0\\\\v = \sqrt{2 \times 9.8 \times 1} \\\\v=4.42 \;\rm m/s[/tex]
So, the kinetic energy is calculated as,
[tex]KE = \dfrac{1}{2} \times 50 \times (4.42)^{2}\\\\KE = 488.41 \;\rm J[/tex]
Thus, we can conclude that the kinetic energy of the can when it is 1.0 meter above the floor is 488.41 J.
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A flat screen TV uses 120 Watts. How much energy is used up if it is left on for 15 minutes? Question 25 options: 4 J 15 J 0.67 J 108,000 J
Answer:
Option d (108,000 J) is the correct answer.
Explanation:
The given values are:
Power,
P = 120 Watts
Time,
t = 15 min.
i.e.,
= 900 sec
As we know,
⇒ [tex]P=\frac{W}{t}[/tex]
So,
⇒ [tex]W=P\times t[/tex]
On substituting the given values, we get
⇒ [tex]=120\times 900[/tex]
⇒ [tex]=108,000 \ J[/tex]
02.4) Calculate the charge and give the unit when
a current of 0.15 A flows around the circuit for
20 seconds.
[3 marks)
02.5) Calculate how much energy is transferred from the
battery in 20 seconds. Use your answer from 02.4.
[2 marks]
Answer:
please find attached pdf
Explanation:
A 1.5-mole sample of an ideal gas is gently cooled at constant temperature 320 K. It contracts
from initial volume 19 L to final volume V2. A total of 1.2 kJ of heat is removed from the gas during the contraction process. What is V2? Let the ideal-gas constant R = 8.314 J/(mol .K).
Answer:
V₂ = 14.07 L
Explanation:
As this gas is cooled at constant temperature of 320 K, this means that we are on an isothermal process, and according to the 1st law of thermodynamics:
Q = W (1)
And as the temperature is constant, we can use the following expression to calculate the Work done:
W = nRT ln(V₁/V₂) (2)
However, as Q = W, we can replace heat into the above expression and then solve for V₂:
Q = nRT ln(V₁/V₂)
Replacing we have:
1200 = (1.5 * 8.314 * 320) ln(19/V₂)
1200 = 39907.2 ln(19/V₂)
ln(19/V₂) = 1200/3990.72
ln(19/V₂) = 0.3007
19/V₂ = e^(0.3007)
V₂ = 19 / e^(0.3007)
V₂ = 14.07 LHope this helps
A 50Kg girl jumps off a 5-meter-high diving board. What is her kinetic energy right before she hits the water?
Answer:
2450 J
Explanation:
Given that,
A 50Kg girl jumps off a 5-meter-high diving board.
We need to find the kinetic energy of the girl before she hits the water. At this point the kinetic energy becomes equal to the potential energy such that,
[tex]K=mgh\\\\K=50\times 9.8\times 5\\\\K=2450\ J[/tex]
So, her kinetic energy right before she hits the water is equal to 2450 J.
plzzzzzz helppp out with thiss
Answer:
sorry, I do not know :(
Explanation:
Do not be angry!!!
how is electromagnets magnetic field is controlled by a switch
Answer:
They affect by switch by the conductors
Explanation:
sana makatulong
A puppy is running with a speed of 11.2 m/s towards it owner when it
gets distracted by a squirrel and stops running. If it halted its run in 2 s,
what is the puppy's acceleration?
Answer:
-5.6m/s²
Explanation:
Given parameters:
Initial speed = 11.2m/s
Time of running = 2s
Unknown:
Acceleration of the puppy = ?
Solution:
Acceleration is the rate of change of velocity with time.
So;
Acceleration = [tex]\frac{Final speed - initial speed }{time}[/tex]
final speed = 0m/s
Acceleration = [tex]\frac{0 - 11.2}{2}[/tex] = -5.6m/s²
Please answer for this in class 12 physics
Answer:
w1:w2 = 16:1
Explanation:
As we know that ration of amplitude is equal to
[tex]\frac{a_1}{a_2} = \sqrt{\frac{w_1}{w_2} }[/tex]
here w1 and w2 are the widths of the slit.
[tex]\frac{I _{min}}{I_{max}} = \frac{(a_1-a_2)^2}{(a_1+a_2)^2} \\\frac{9}{25} = \frac{(1-\frac{a_2}{a_1} )^2}{(1+\frac{a_2}{a_1} )^2} \\\frac{3}{5} = \frac{(1-\frac{a_2}{a_1} )}{(1+\frac{a_2}{a_1} )}\\8 \frac{a_2}{a_1} = 2\\\frac{a_1}{a_2} = 4[/tex]
Again
[tex]\frac{a_1}{a_2} = \sqrt{\frac{w_1}{w_2} }[/tex]
[tex]4 = \sqrt{\frac{w_1}{w_2} }\\\frac{w_1}{w_2} = 16[/tex]
w1:w2 = 16:1
A 30 kg is placed on a skateboard and pushed across the room with a velocity of 4 m/s. the pusher applies more force, increase the velocity to 10 m/s. How much work was done to move the box ?
Answer:
Dawg
Explanation:
I WILL GIVE BRAINLIEST!!!
Answer:
7.27 m/s
Explanation:
40/5.5 = 7.27m/s
Which object has a weight of about 22.5 Newtons
A pic is given above
no trolling or a report is getting thrown right at u
Answer:
Rock
Explanation:
Right on edg 2021 and 2020000000:P
Un parașutist are, împreună cu parașuta, o masă de 110 kg. Atunci când parașuta este deschisă, el are o mișcare rectilinie și uniformă. b) Calculează forța de rezistență a aerului în situația descrisă.
Answer:
The calculation and explanation is given below:
Explanation:
a) Here the forces represent that there are parachutist weight and the parachute G also the force of air resistance.
b) As the displacement would be made in HRM so the weight and Air resistance force would be equivalent in the opposite way
G = mg
= 110 × 10
= 1100N
Fr = 1100N
Can someone explain to me what omega(ω) represents and what theta(θ) represents when it comes to angular motion?
Answer:
the twenty-fourth, and last, letter of the Greek alphabet (Ω, ω), transliterated as ‘o’ or ‘ō.’.
Explanation:
Calculate the momentum for the 5 kg bowling ball moving at 6 m/s.
Answer:
Given
mass (m) =5kg
velocity (v) =6m/s
momentum (p) =?
Form
p=mv
5kgx6m/s
p=30kg.m/s
momentum =30kg.m/s
ignore the crossword. please help <3
Answer:
2 kinetic
3 thermal energy
4 radiation
5 conduction
6 convection
7 heat
natural magnet is known as _________
Answer:
a lodestone
Explanation:
a lodestone is a naturally magnetized piece of the mineral magnetite.
PLEASE IM TIMED! GIVE BRAINLIEST OF U ANSWER THESE 2 QUESTION!!
Answer:
thermaltrueExplanation:
hope this helps!
thermal,true the explanation is because the other guy said so
Available natural source of energy in the Philippines?
A collision where the objects stick together after impact is called a/an _______.
The answer is:
An/a inelastic collision
Hope This Helps! Have A GREATTT DAY!!!a small bird stands on the surface of earth. which of the following is true of the gravitational force that the BIRD exerts on the earth?
A. the bird doesnt exert gravitational force on the earth
B. the bird has a smaller magnitude than the gravitational force that earth exerts on the bird.
C. the bird has a larger magnitude than the gravitational force that the earth exerts on the bird
D. it has the same magnitude as the gravitational force the earth exerts on the bird.
I'm between B and D
Answer:
I believe that B is the right one.
name 6 countries where soccer is called football
Answer:
Brazil, France, Spain ,Puerto rico,Venezuela, Yemen
Explanation:
A force of 31 N south is used to accelerate an object uniformly from rest to 8 m/s in 22 s. What is the mass of the object?
this question is centered around newtons second law f=ma
First you need to find the acceleration
[tex] acceleration = \frac{8 - 0}{22} [/tex]
that gives you 0.36 recurring(on both numbers) m/s²
mass= force ÷ acceleration
[tex] mass = \frac{31}{0.36recurring} [/tex]
mass= 85.25 kg
if you want to check
f=ma
85.25 × 0.36 recurring (remember its on both numbers not just 6) = 31 N
Answer:
Explanation:
Givens
F = 31 N
vi = 0
vf = 8 m/s
t = 22 seconds
m = ?
Formula
F = m ( vf - vi)/t
Solution
31 = m (8 - 0) / 22 Multiply both sides by 22
31 * 22 = 8 * m
8m = 682 Divide by 8
m = 682 / 8
m = 85.25