The convex lens is a lens that converges rays of light that convey parallel to its principal axis (i.e. converges the incident rays towards the principal axis) which is relatively thick across the middle and thin at the lower and upper edges. The edges are curved outward rather than inward.
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
pls help me i will name brainliest
Answer:
a for the first one b for the second
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
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
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:
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.
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
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.
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
A disc whose moment of inertia is 1kgm² is rotating at 100 rad/sec. This disc is pressed against a similar disc that is able to rotate freely but is initially at rest. The two disc together and rotate as a unit. Determine the final angular velocity of the system.
it may help you have a great day
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.
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.
:)
The wave take 0.12 to reach the satellite. Calculate the height of the orbit of the communications satellite
Answer:
x = 3.6 10⁷ m
Explanation:
The speed of an electromagnetic wave is constant, in a vacuum its value is c = 3 10⁸ m / s, this speed decreases when entering a material medium,
v = c / n
where n is the refractive index, but in this case the refractive index of air is n = 1.00002. The refractive index of a vacuum is n = 1, so we can assume that the change in velocity is negligible.
For the calculation we can use the relations of the uniform motion
v = x / t
x = v t
let's calculate
x = 3 10⁸ 0.12
x = 3.6 10⁷ m
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
My Fitness Goals: (List your specific and general goals)
Example:
Specific Goals:
Improving muscular strength and endurance.
General Goals:
Developing a more positive attitude about myself.
answer this please
What is the fluid theory of electricity?
Answer:
Fluid theories of electricity are outdated theories that postulated one or more electrical fluids which were thought to be responsible for many electrical phenomena in the history of electromagnetism.
I hope it's helpful!
Please helpp!!!!!!!!!!!!!!!!!!!!!!
Answer:
A. Conservation of energy.
Explanation:
Kirchhoff's loop rule is an example of conservation of energy.
_______ is a feeling of admiration for someone or something elicited by their abilities, qualities, or achievements.
love
empathy
infatuation
respect
Answer:
Respect is a feeling of admiration for someone or something elicited by their abilities, qualities or achievements.
Explanation:
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.
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
Which of these is not a scalar quantity?
Answer:
options?!?
Explanation:
give us some options
14) What is the velocity of a wave 5.35 x 10 cm long with a frequency of 16kHz
Answer:
wavelength= 5.35×10cm=0.535m
f= 16000hz
v= wavelength × f= 0.535×16000=8560m/sec
Which graph shows a vehicle traveling at a constant speed?
(look at the attached photo)
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:
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:
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
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:
https://brainly.com/question/1640558
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A radioactive isotope has a half-life of 20 hours. How long will it take for 3/4 of the source to decay?
Answer:
40 hours
Explanation:
in 20 hours, 1/2 will decay
in 40 hours, 1/4 will decay
therefore, 40 hours
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
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:
