Answer:
wavelength= 5.35×10cm=0.535m
f= 16000hz
v= wavelength × f= 0.535×16000=8560m/sec
The brightest, hottest, and most massive stars are the brilliant blue stars designated as spectral class O. If a class O star with a mass of 3.38 ´ 1031 kg has a kinetic energy of 1.30 ´ 1042 J, what is its speed?
Answer:
2.77 * 10^5 m/s
Explanation:
Let us recall that kinetic energy is given by 1/2 mv^2
Where;
m = mass of the body
v = velocity of the body
In this case,
m = 3.38 * 10^31 kg
KE= 1.30 * 10^42 J
KE = 1/2 mv^2
v = √2KE/m
v = √2 * 1.30 * 10^42/3.38 * 10^31
v = √7.69 * 10^10
v = 2.77 * 10^5 m/s
What do you understand if the frequency of a sound is 70 Hz?
Answer:
see below
Explanation:
frequency of a wave is the number of complete waves produced per second
so 70 Hz
means, that 70 complete waves are produced in one second,
hope this helps
A rectangular block of copper metal weighs 1896 g. The dimensions of the block are 8.4 cm by 5.5 cm by 4.6 cm. From this data, what is the density of copper? (hint: find the volume of a block first)
Answer:
8.9 g/cm^3
Explanation:
density = mass/volume
volume = length * width * height
volume = (8.4 cm)(5.5 cm)(4.6 cm)
volume = 212.52 cm^3
mass = 1896 g
density = (1896 g)/(212.52 cm^3)
density = 8.9 g/cm^3
A human cannonball act uses springy bungee cords instead of gunpowder to launch a person through a long cylindrical tube into the air. If a cannon is capable of launching a 55 kg test dummy 11 m into the air when launched straight up, how much energy is stored in the bungee cords? *
A. 539J
B. 605 J
C. 2965J
D. 5929 J
Answer:
Energy stored, E = 5929 J
Explanation:
Given that,
The mass of a test dummy, m = 55 kg
It is launched 11 m into the air.
We need to find the energy stored in the bungee cords. It can be calculated as follows :
[tex]E=mgh\\\\E=55\times 9.8\times 11\\\\E=5929\ J[/tex]
So, 5929 J of energy is stored in the bungee cords.
SOMEONE HELP ME PLEASE
Free is the movement of an object towards earth solely because of gravity.
What is freefall? Free fall is when objects falling near earth’s surface accelerate downward at rate of 9.8 m/s2.
Give an example of an object in free fall
Which of the following properties of a wave cannot be changed by reducing wave velocity?
A. Period
B. Frequency
C. Wavelength
D. Amplitude
Answer:
B
Explanation:
Trust me
Wavelength is the only one that CAN be.
A, B, or D can't be.
If the wavelength of a wave in a particular medium is tripled, what will happen to the frequency of the wave?(1 point)
It will become one third of its original value.
It will depend on the speed of the wave.
It will become triple its original value.
It will remain constant.
Answer:
It will become one third of its original value
Explanation:
Your are on a boat on a lake with no current. The lake is full of sharks that will eat you if you put your hands too close to the water, and your paddle has been eaten by those sharks. However, you do have a big bucket of grapefruit in the boat. How will you get to shore? Your answer must reference Newton's third law.
Answer:
i would use the grapefruit and throw it into the water 1 by 1 one leaving sometime in between to see the sharks reaction to it. If they get attracted to it i would throw 1 in then use the bucket to push foward as fast as i can with all of my strength so i can get an equal and opposite reaction from the water to push me foward, i would keep this up for as long as i can. The size of the bucket and the amount of grapefruit were never specified so i would use this for my benefit to say its enough to get to shore
Explanation:
If magnet A can hold 3 steel paperclips and magnet B can hold 5 steel paperclips, which one is stronger
A: magnet A
B: magnet B
• C: they are equally strong
D: magnets wouldn't attract steel
paper clips
Answer:
magnet b
Explanation:
because it has a stronger current so it attracts more paper clips
a chef is testing out a new iron cookware. He knows that iron specific heat of 445 j/kg Celsius. he heats a 2kg iron pan on a stove for 5 minutes and finds that the temperature of the iron skillet has increased by 150 degrees Celsius. calculate the amount of heat energy absorbed by the pan.
Answer:
[tex]\boxed {\boxed {\sf 133,500 \ Joules}}[/tex]
Explanation:
Since we are given the specific heat, mass, and change in temperature, we should use this formula for heat energy.
[tex]q=mc \Delta T[/tex]
The mass is 2 kilograms. Iron's specific heat is 445 Joules per kilogram degree Celsius. The temperature increases by 150 degrees Celsius.
[tex]m= 2 \ kg \\c= 445 \ J/kg \textdegree C\\\Delta T= 150 \textdegree C[/tex]
Substitute the values into the formula.
[tex]q= (2 \ kg)( 445 \ J/kg \textdegree C)(150 \textdegree C)[/tex]
Multiply the first two numbers. The kilograms will cancel.
[tex]q= 890 \ J/\textdegree C (150 \textdegree C)[/tex]
Multiply again. This time the degrees Celsius cancel.
[tex]q= 133, 500 \ J[/tex]
The pan absorbs 133,500 Joules of heat energy.
A man works on a striaght road from his home to market 2.5km away dwith a speed of 5km/h.Finding the market closed, he instantly truns and walk back home with a speed of 7.5km/h. The average speed of the man over the interval of time 0.40min.Is equal to?
Answer:
5.625km/h
Explanation:
We are given that
Distance between home and market, d=2.5 km
Speed, v1=5km/h
Speed, v2=7.5 km/h
We have to find the average speed of the man over the interval of time 0 to 40min.
Time,[tex]t=\frac{distance}{speed}[/tex]
Using the formula
[tex]t_1=\frac{2.5}{5}=0.5 h=0.5\times 60=30 min[/tex]
1 hour =60 min
[tex]t_2=\frac{2.5}{7.5}=\frac{1}{3}hour=\frac{60}{3}=20min[/tex]
Distance traveled by man in 10 min with speed 7.5 km/h=[tex]\frac{2.5}{20}\times 10=2.5/2km[/tex]
Therefore,
Total distance covered=2.5+2.5/2=3.75 km
Time=40 min=40/60=2/3 hour
Average speed=[tex]\frac{total\;distance}{total\;time}[/tex]
Average speed=[tex]\frac{3.75}{2/3}=5.625km/h[/tex]
5. A student is investigating the relationship between pressure,
temperature, and entropy. A student manages to obtain a sample of ice,
water, and water vapor that all coexist at the same temperature called
the triple point. Which will have the greatest entropy at the triple point?
Answer:
The water vapor will have the greatest entropy at the triple point
Explanation:
At the triple point of water, which has the properties of 0.0075°C temperature and 6.11657 mbar pressure, solid ice, liquid water and water vapor exist together in a location
According to Professor Stephen Lower on LibreTexts website entropy is a measure the extent to which thermal energy is shared and spread in a system
The change in entropy, ΔS = ΔH/T
The heat change in [tex]\Delta H_{melting}[/tex] = 6.01 kJ/mol
The heat change in vaporization, [tex]\Delta H_{vaporization}[/tex] = 45.05 kJ/mol
The heat change in sublimation, [tex]\Delta H_{sublimation}[/tex] = 51.06 kJ/mol
Therefore, the entropy of the water vapor [tex]S_{water \ vapor}}[/tex] > The entropy of liquid water, [tex]S_{Liquid \ water}[/tex] > The entropy of the solid ice, [tex]S_{Solid \, ice}[/tex]
The portion with the highest entropy at the triple point is the water vapor
The water vapor will have the greatest entropy at the triple point
A student used a PhET simulation to investigate factors that affect the strength of electromagnets. Which of the following is the best explanation of the position of the of the compass needle in the investigation?
a. The needle is aligned with the coil.
b. The needle is aligned with the electrical field from the battery.
c. The needle is aligned with the magnetic field from the coil.
d. None of the above
Answer: C. The needle is aligned with the magnetic field from the coil.
The best explanation for the position of the compass needle in the investigation is "The needle is aligned with the magnetic field from the coil." The correct option is C.
What is a magnetic field?A magnetic field is a region in space where a magnetic force can be detected. It is created by moving charges, such as electrons in a current or the motion of the Earth's molten core. The strength and direction of the magnetic field depend on the properties of the magnetic source and can be visualized using magnetic field lines. The magnetic field plays a fundamental role in electromagnetism and has important practical applications in a wide range of devices, from electric motors and generators to MRI machines and particle accelerators.
Here in the Question,
The strength of an electromagnet depends on the strength of the magnetic field produced by the current flowing through the coil. As the current flows through the coil, it generates a magnetic field around it, which causes the compass needle to align with the field lines. The direction of the magnetic field around the coil depends on the direction of the current flowing through it, and the compass needle aligns itself with the magnetic field lines produced by the coil.
Option (a) The needle is aligned with the coil is not a correct explanation because the compass needle is not aligned with the physical coil itself but with the magnetic field generated by the coil.
Option (b) The needle is aligned with the electrical field from the battery is not a correct explanation because the electrical field produced by the battery does not affect the position of the compass needle. The electrical field is used to create a current in the coil, which produces a magnetic field that the compass needle aligns with.
Option (d) None of the above is not a correct explanation because the compass needle is indeed aligned with the magnetic field produced by the coil.
Therefore, the best explanation for the position of the compass needle is that it is aligned with the magnetic field from the coil.
To learn more about Faraday's law click:
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if a truck is accelerating at 39 MSS and it crashes into a tree within 45,000 in a force what was the mass of the truck?
Answer:
Mass of the truck is [tex]1154[/tex] Kg
Explanation:
As we know that
Force is the product of mass and acceleration.
F = m * a
Here acceleration, a [tex]= 39[/tex] m/s^2
Force, F [tex]= 45000[/tex] Newton
Mass = [tex]\frac{F}{a}[/tex]
Mass
[tex]= \frac{45000}{39} \\= 1154[/tex] Kg
Magnetism is a type of. A)energy B)electricity
B.Electrcity
Explanation:
invlove attraction and repulsion between charges particles
Explanation:
maybe both
hope it helps
why are gases less dense than solids
Answer:
Molecules are more spread apart in gasses than in solids.
Explanation:
In gasses, molecules are free to move around in their given space, allowing them to spread more.
Gases are less dense than solids because their volume is comparatively more than solids.
WILL GIVE BRAINLIST a HELP PLEASE
pleaseeee
Answer:
Concave mirror
Explanation:
Because as we move the object far away from the mirror, the image gets inverted.
Answer:
Concave mirror
Explanation:
What is the impact force on a 0.5 kg object if it falls 3 meters and hits a carpeted floor at 8 m/s, stopping in 0.10 seconds?
the I'm pact force of 0.5 is lol u guys go and study why r u asking answers
Define one metre length.
Answer:
The metre is currently defined as the length of the path travelled by light in a vacuum in 1299 792 458 of a second
A 3.8-mole sample of an ideal gas is gently heated at a constant temperature of 340 K. The gas expands to 2.3 times its initial volume. What is the change in the internal energy of the gas? Let the ideal-gas constant R=8.314 (mol x K)
Answer:
0J
Explanation:
0J just took the test
pls help me i will name brainliest
Answer:
a for the first one b for the second
PLS ANSWER FAST WILL GIVE BRAINLY!!!
what is an electron shell
Answer:
In chemistry and atomic physics, an electron shell may be thought of as an orbit followed by electrons around an atom's nucleus. The closest shell to the nucleus is called the "1 shell", followed by the "2 shell", then the "3 shell", and so on farther and farther from the nucleus.
Explanation:
Answer:
An electron shell is the outside part of an atom around the atomic nucleus. It is a group of atomic orbitals with the same value of the principal quantum number n
Explanation:
1. Electrons spinning around the nucleus of an atom cause the atom to
a. be a tiny magnet.
b. have north and south poles.
c. have a magnetic field.
d. all of the above
Answer:
Answer:answer is C
is the magnetic field
Which quantity is a vector?
А
acceleration
B.
distance
С
speed
D
mass
Answer:
b
Explanation:
Vector, in physics, a quantity that has both magnitude and direction.
Which graph shows a vehicle traveling at a constant speed?
(look at the attached photo)
A bus of mass 3,500 kg that is moving at a speed of 18 m/s and
a car of mass 1,300 kg that is moving at a speed of 20 m/s.
What's the total linear momentum of the bus and the car?
According to the given statement The total linear momentum of the bus and the car 890000 Kg • m/s.
What is a momentum in physics?Momentum be defined as the intensity of a body's motion. As momentum depends on both velocity and the orientation of the skin's motion, it is quantified by "mass velocity". Since speed is a vector and mass is a scalar, momentum is the product. Momentum propels you through from the finish line after helping you get beyond the initial difficulty of being unable to begin. Gaining momentum will enable you to go closer to your objectives by fostering optimistic thinking and energy.
How does momentum start?In Newtonian mechanics, an object's mass and velocity are combined to form momentum, more precisely linear energy or translational momentum. It has both a magnitude and direction, making it a vector quantity.
Briefing:P₁ = 3,500 kg
P₂ = 18 m/s
m₁ = 1,300 kg
V₁ = 20 m/s.
P₁ + P₂ = m₁V₁ + m₂V₂
3500(18) + 1300(20)
=63000 + 26000
=890000 Kg • m/s
To know more about Momentum visit:
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WILL GIVE YOU BRAINLIST IF YOU ANSWER
Arctic foxes have adapted to the tundra cycles by turning white in the wintertime. Which other tundra animal has adapted the same way?
musk oxen
willow ptarmigan
black flies become white flies
grey wolf
Answer:
thanks
Explanation:
willow ptarmigan
An object is in uniform circular motion and is moving at a speed of 2.3 m/s. How does the speed of the object change if the centripetal force and
the radius stay the same, but the mass quadruples?
(A) Its speed is cut in half, because centripetal force is based on the square root of velocity.
(B) Its speed is cut in half, because centripetal force is based on velocity squared.
(C) Its speed is doubled, because centripetal force is based on the square root of velocity.
(D) Its speed is doubled, because centripetal force is based on velocity squared.
Answer:B
Explanation:
Answer:
The answer is B
Explanation:
write down the expressions for the heat produced per second in a resistor in terms of potential difference and current
Answer:
the correct answer is :
heat produced = I^2RT
what is the diffrence between a solar system and a galaxy
Answer:
Our Solar System consists of our star, the Sun, and its orbiting planets (including Earth), along with numerous moons, asteroids, comet material, rocks, and dust. Our Sun is just one star among the hundreds of billions of stars in our Milky Way Galaxy. The universe is all of the galaxies – billions of them!
Answer:
Our Solar system has a our sun and many other planets that you are familar with such as mars, jupiter, venus. A galaxy is broad term meaning it any gravitionaly bound system with stars, planets, dust, dark matter, etc.
Explanation:
Pretty much a solar sytem consits of "our" planets like jupiter, mars, earth, etc. A Galxy is just a part of space that is not spefic to us.
:)
