Answer:
c
Explanation:
i just did this study island and the answer was wrong
. A cylinder of mass M and radius R is released from rest at the top of an inclined plane. The cylinder rolls without slipping down the incline. The rotational inertia of the cylinder is MR2/2.
Derive an expression for the angular momentum of the cylinder about its center of mass when it has rolled a vertical distance h. Express your answer in terms of M, R, h, and physical constants, as appropriate.
For a cylinder of mass M and radius R is released from rest at the top of an inclined plane, the expression is mathematically given as
L=MR * √{gh/3}
What is the expression for the angular momentum of the cylinder about its center of mass when it has rolled a vertical distance h.?Generally, the equation for the angular velocity is mathematically given as
w=V/R
Therefore
[tex]w=\frac{\sqrt{ugh/3}}{R}[/tex]
In conclusion, at instance of IW, the angular velocity
[tex]L=MR^2/2 * 2\sqrt{gh/3}/R[/tex]
L=MR * √{gh/3}
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Hi, Can anyone help me? I don't understand.
A car horn has a frequency of 448 Hz when the car is stationary. If the car approaches a stationary recorder at a speed of 19.0 m/s, what frequency does the device record if the temperature is 20°C? What frequency does the device record after the car passes by?
**SHOW CALCULATIONS, PLEASE!
The frequency recorded by the device after the car passes by at the given speed is 474.27 Hz.
Observed frequency recorded by the deviceThe frequency recorded by the device is determined by using the following formula for doppler effect.
[tex]f_o = f_s(\frac{v + v_0}{v- v_s} )[/tex]
where;
v is speed of sound at 20°C = 343 m/s[tex]f_o = 448(\frac{343 + 0}{343-19} )\\\\f_0 = 474.27 \ Hz[/tex]
Thus, the frequency recorded by the device after the car passes by at the given speed is 474.27 Hz.
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Which of the following concussion BEST describes the data Kevin collected?
A. Sound travels slower in the denser medium
B. Sound travels faster in the denser medium
C. Velocity of the sound wave does not change in the different media
D. Velocity of the sound wave does not change in the different media but in the frequency
What is the formula for principle of moments ?
Answer:
The Principle of Moments states that when a body is balanced, the total clockwise moment about a point equals the total anticlockwise moment about the same point. Moment =force F x perpendicular distance from the pivot d.
004 (part 1 of 3) 10.0 points
Two moles of helium gas initially at 410 K
and 0.47 atm are compressed isothermally to
1.34 atm.
Find the final volume of the gas. Assume
that helium behaves as an ideal gas. The
universal gas constant is 8.31451 J/K · mol.
005 (part 2 of 3) 10.0 points
Find the work done by the gas.
Answer in units of kJ.
006 (part 3 of 3) 10.0 points
Find the thermal energy transferred.
Answer in units of kJ.
The final volume of the gas, work done, and the thermal energy transferred is mathematically given as
vf=0,0623m^2
W=-4.03KJ
Q=-4.03KJ
What are the final volume of the gas, work done, and the thermal energy transferred?
Generally, the equation for the ideal gas is mathematically given as
Pv=nRT
Therefore
vf=nRT/P
vf=2*8.314330/1*1.01*10^3
vf=0,0623m^2
In conclusion
vi=nRT/Pi
vi=0.1175m^3
w=pdv
w=2*8.314*330in()0.0623/0.117
W=-4.03KJ
Where
Q=W
Q=-4.03KJ
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A lightning bolt transfers 6.0 coulombs of charge from a cloud to the ground. In 2.0*10^-3 second. What is the average current during this event.
Answer:
sup cuh, i just want the point lol
Explanation: sorry not sorry reases
A group constructed two pendulums of different masses and measured their periods multiple times. Their analysis indicated their two samples were distinguishable. What can you infer from these findings
What I can infer from these findings is that
The period of a pendulum is equal to 2pi'sqrt(e) The period of a pendulum is proportional to its length.This is further explained below
What are pendulums?Generally, A pendulum is simply defined as a body that is held from a point and swings under the effect of gravity.
In conclusion, The length of the pendulum varies, but the time period remains constant due to gravity's acceleration at different locations on Earth.
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CQ
A group constructed two pendulums of different lengths and measured their periods multiple times. Their analysis indicated their two samples were indistinguishable. What can you infer from these findings? The two lengths might have been too similar The period of a pendulum is equal to 2pi'sqrt(e) The period of a pendulum is proportional to its length. The two lengths might have been too different.
If the battery has 1000 joules stored in it, how long will the light be illuminated, assuming the voltage is constant
Answer:
20 mins
Explanation:
How can larger telescopes
give astronomers a more precise picture of the distances to the nearest stars?
Answer:
Explanation:
"Larger telescopes" generally means larger apertures. This is the part of the telescope which collects the light. The more light collected, the more clear the picture becomes
What would most likely happen if the decomposers were removed from the food web?
A.There would be more energy to pass around.
B.The consumers would have more food to eat.
C.There would be less competition for animals that rely on plants for food.
D.The decaying matter would not be returned back into the environment.
Which of the statements is true regarding the physical properties of hydrocarbons?
1.All hydrocarbons are liquids.
2.All hydrocarbons are gases.
3.Smaller hydrocarbons have higher boiling points and melting points.
4.Larger hydrocarbons have higher boiling points and melting points.
Answer:
4 is correct
Explanation:
The more carbons in a hydrocarbon there are the higher the melting point will become.
the resistance of a fixed coil measures 55 ohms at 25 degrees Celsius and 65 ohms at 75 degrees Celsius find the temperature coefficient of the conductor at zero degree celsius
Answer:
To change degrees Celsius in degrees Fahrenheit, the formula is:
F = 1.8C +32F=1.8C+32
So,C = 1.8C +32C=1.8C+32
C = -40C=−40
T=-40+273.15=233.15\ KT=−40+273.15=233.15 K
0.09/^oC
Which of the
following
denotes the
wavelength of
the wave on
the image?
A. A and C
B. Band E
C. F only
D. D and G
if you looked at the frequency spectrums of two friends saying the word dog, would they look the same or different?
Answer:
different
Explanation:
everybody have there own way of saying it.
A box with a total surface area of 1.2 m2 and a wall thickness of 4 cm is made of an insulating material. A 10 W electric heater inside the box maintains the inside temperature at 15 oC above the outside temperature. What is the thermal conductivity of the insulating material in units of kcal/(s oC m)
For a box with a total surface area of 1.2 m2, the thermal conductivity of the insulating material is mathematically given as
k=5.29*19^{-6} kcal/(s oC m)
What is the thermal conductivity of the insulating material?Generally, the equation for the is mathematically given as
P=Ka dT/L
Therefore
k=10*4*10^{-2}/1.2*1.5
k=5.29*19^{-6} kcal/(s oC m)
In conclusion, the thermal conductivity
k=5.29*19^{-6} kcal/(s oC m)
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Cognitive psychology deals with ____.
a: neutral transmissions
b: behavior influence
c: thoughts
Answer:
B
Explanation:
Because the main focus of cognitive psychology is on the metal processes that affect behavior
an object is placed 20cm from a converging lens. If the real image is formed 80cm from the object, what is the focal length of the lens?
Explanation:
Here,
object distance(u)=20cm
image distance(v)=80cm-20cm=60cm
focal length(f)=?
we know ,
(1/f)=(1/v)+(1/u)
1/f = 1/60 + 1/20
1/f = (1+3)/60
60 =4f
f=15cm
This image to the left is a simple circuit. What part of the circuit is considered the “source”?
a. the battery
b. the wire
c. one of the lightbulbs
d. the switch
Answer:
The battery it consider as one of the circuits elements.
Describe the motion of the object in the graph below. *
(A) The object is at rest
(B) The object is accelerating
(C) The object is moving at a constant speed
the object moving at constant velocity so the answer is c
if i have 5.6 liters of gas in a piston at a pressure of 1.5 pa and compress the gas until it’s volume is 4.8 L what will the new pressure inside the piston be?
An electric generator converts kinetic energy into which kind of energy? stored mechanical potential electrical
Answer:
The generator, in turn, converts the mechanical (kinetic) energy of the rotor to electrical energy. Different types of turbines include steam turbines, combustion (gas) turbines, hydroelectric turbines, and wind turbines.
Answer:
electrical energy ;))
Explanation:
The fundamental measuring unit of Electromagnetism is?
Ampere (electric current)
Volt (electric potential)
Coulomb (electric charge)
The fundamental measuring unit of electromagnetism is Ampere (electric current.Option 1 is correct.
What is electromegnetism ?The physical interplay of electric charges, magnetic moments, and the electromagnetic field is known as electromagnetism.
The electromagnetic field can be static, moving slowly, or forming waves. Electromagnetic waves are commonly referred to as light and are subject to optics laws.
The fundamental measuring unit of electromagnetism is Ampere (electric current.Option 1 is correct.
Hence option 1 is correct.
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Astronomers know that dark matter is present in galactic halos because the speeds of orbiting stars _________ far from the center of the galaxy.
Astronomers know that dark matter is present in galactic halos because the speeds of orbiting stars is constant far from the center of the galaxy.
What is the speed of orbiting stars from center of the galaxy?The speed of stars is in the range of 1 kpc to 16 kpc from the galactic centre.
These stars move approximately on circular orbits about the galactic centre along with small peculiar velocities.
For most of the stars, the velocities range between 200 km/s to 250 km/s.
The speed of the stars orbiting stars remains constant far from the center of the galaxy.
Thus, Astronomers know that dark matter is present in galactic halos because the speeds of orbiting stars is constant far from the center of the galaxy.
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How do you calculate distance traveled from a speed/time acceleration graph?
Answer:
by multiplying speed with time
Explanation:
Suppose a star has the same apparent brightness as Alpha Centauri A ( 2.7×10−8watt/m2 ) but is located at a distance of 300 light-years. What is its luminosity?
For a star that has the same apparent brightness as Alpha Centauri A ( 2.7×10−8watt/m2 is mathematically given as
L=2.7*10^30w
What is its luminosity?Generally, the equation for the luminosity is mathematically given as
L=4*\pi^2*b
Therefore
L=4*\pi^2*b
L=4* \pi *(2.83*10^{18})*2.7*10^{-8}
L=2.7*10^30
In conclusion, the luminosity
L=2.7*10^30w
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Is the moment of inertia of a body is unique? Give reason to your answer.
Answer:
The moment of inertia about a "fixed" axis is unique.
The moment of inertia of a square is different for an axis that passes perpendicular to the center of the square as opposed to an axis that lies in the plane of the square.
Torque = I * alpha shows that angular acceleration depends on I but not on the angle thru which I rotates α = ω / t
How many galaxies similar in size to the milky way would you expect to find, on average, in cubes of that same size? in order to simplify the problem, assume that the total number of galaxies of each type has not changed between then and now.
We would discover 64 galaxies the size of the Milky Way in a cube that now holds one galaxy the size of the Milky Way.
What is a galaxy?A galaxy is a massive clump of gas, dust, and billions of stars and their solar systems bound together by gravity.
The first galaxies were discovered in the 17th century by Charles Messier, who had no idea what they were at the time.
Messier, a proficient comet viewer, noticed many more fuzzy objects in the sky that he knew were not comets.
We would discover 64 galaxies the size of the Milky Way in a cube that now holds one galaxy the size of the Milky Way.
Hence there are 64 galaxies similar in size to the milky way.
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2. An electric motor transfers 2003 in 10.0 s. If it then transfers the same amount of energy in 8.0 s, has its
power increased or decreased?
Answer:
decreased
Explanation:
because it transfered from 10.0s
to 8.0s
How does nuclear fusion affect the life cycle of a star?.
Answer:
As the main sequence star glows, hydrogen in its core is converted into helium by nuclear fusion. When the hydrogen supply in the core begins to run out, and the star is no longer generating heat by nuclear fusion, the core becomes unstable and contracts
Explanation:
A charge of 8.4 × 10–4 C moves at an angle of 35° to a magnetic field that has a field strength of 6.7 × 10–3 T.
If the magnetic force is 3.5 × 10–2 N, how fast is the charge moving?
9.1 × 10–5 m/s
1.3 × 10–4 m/s
7.6 × 103 m/s
1.1 × 104 m/s
Answer:
the correct answer is D
Explanation: