Answer:
f = 215.27 Hz
Explanation:
We have,
An open-pipe resonator has a length of 2.39 m.
It is required to find the frequency of its third harmonic if the speed of sound is 343 m/s.
For third harmonic, its length is equal to, [tex]l=\dfrac{3\lambda}{2}[/tex]
So,
[tex]\dfrac{3v}{2f}=2.39[/tex]
f is frequency in its third harmonics
[tex]f=\dfrac{3v}{2\times 2.39}\\\\f=\dfrac{3\times 343}{2\times 2.39}\\\\f=215.27\ Hz[/tex]
So, the frequency of its third harmonic is 215.27 Hz.
A critical period begins and ends abruptly
Answer:
yes
Explanation:
A critical period?
A.begins and ends abruptly
B.begins and ends gradually
C.is unaffected by stimuli
D.is unlikely to impact development
correct answer (A.begins and ends abruptly )
Answer:
yes it is true
Explanation:
i took a test and that is true
If the frequency of sound wave is doubled, the wavelength:
Answer:
decreases
Explanation:
halves and the speed remains unchanged.
an aeroplane taking off from a field has a run of 500m. What is the acceleration and take off velocity if it leaves the ground 10 s after the start
Answer: 50m/s
Explanation: S = D/T which means speed equals distance divided by time.
so 500m divided by 10 : 50m/s
Hope this helps for many people.
explain why thermal energy is always transferred whenever work is done
Answer:
Heat
Explanation:
All materials have go some sort of heat.
Answer:Since the friction force is non-conservative as potential energy. All the work done by the friction forces results in a transfer of energy into thermal energy of the box floor system.
Explanation:
Convert 84 ounces to milliliters
Answer: 2494.18 millilitres
Explanation:
There is 1 ounce per 29.5735 mL
Take 84 ounces and multiply by the 29.5735.
2484.18 mL
Answer: 2,484,18
Explanation:
Where is the safest spot in the house during a tornado, hail storm, and earthquake? Include separate answers.
Answer:
Explanation:
in a room with no windows that way it doesnt shatter. Usually a closet... or if you have a basement.sorry but that applies to all them
Explanation:
for the tornadoes
● go to the basement on the lowest floor.
● for heavy protection get under something heavy for example a heavy table.
hail storm
●go and run for a safe place closer _ by like for example garage,under a shed or service station awning.
● do not leave the vehicle until stops hailing.
earthquake
●The best move is getting under a strong table
or a desk
● hold on the shelter if not hold on your neck and head with both arms and hands.
the speed of a tortoise and a hare are 1m/s and 3m/s. the mass of hare is 5kg and the tortoise is 20kg. which has greater momentum? WITH MATHEMATICAL EXPLANATION PLZ!!
Answer: tortoise
Explanation:
Given the following :
Speed of tortoise = 1m/s
Speed of hare = 3m/s
Mass of hare = 5kg
Mass of tortoise = 20kg
Momentum = product of Mass and velocity
Momentum of hare = mass of hare × Velocity of hare
Momentum of hare = 5kg × 3m/s = 15kgm/s
Momentum of tortoise = mass of tortoise × Velocity of tortoise
Momentum of tortoise = 20kg × 1m/s = 20kgm/s
Therefore, tortoise has a greater momentum than hare.
Answer:
The equations are both written in slope-intercept form, so I can see that the slope of one equation is 2 and the other is 8. If the slopes of lines are different, they will always intersect at a point.
Explanation:
Which sentence states Newton’s third law?
A.
If two objects collide, each object exerts a force in the same direction as the other.
B.
If two objects collide, each object exerts a force equal to and in the opposite direction of the other.
C.
A collision between a moving object and a stationary object is elastic.
D.
A collision between a moving object and a stationary object is inelastic.
E.
If two objects collide, the moving object exerts a greater force than the stationary object.
Answer:
A. If two objects collide, each object exerts a force in the same direction as the other.
Explanation:
a pebble is dropping from a building that is 125m high. THe pebble is initially at rest. approximately how long does it take for the pebble to reach the ground.
Here's the formula you want to use to solve this:
Distance = (1/2) · (acceleration) · (time²)
We know the distance to the ground and the acceleration of gravity, so let's pluggum in:
. . . . . 125 m = (1/2) (9.8 m/s²) (time²)
Divide each side by (4.9 m/s²):
. . . . . (125 m) / (4.9 m/s²) = time²
. . . . . 25.51 s² = time²
Square-root each side:
5.05 seconds = time
5. Ultraviolet rays are potentially harmful to us primarily due to their
A. intensity
B. high frequency.
C. long wavelength.
D. amplitude.
Answer:
A
Explanation:
Ultraviolet light occurs after white light;
Do you know why gamma rays are harmful because of their high frequency and short wavelength leading to high intensity.
Though the frequency is higher than that of white light, its because of its intensity.
Ultraviolet rays comes handy from depletion of the earth's ozone layer
Hence harmful Ultraviolet rays from the sun attacks the skin Leading to Sun burn and other things.
Answer:
High frequency is the answer
Explanation:
Took pf test is was 100% correct
when only ________ acts on an object's mechanical energy is conserved
A.) Gravity
B.) Friction
C.) Air resistance
D.) Momentum
please help asap
when only Momentum acts on an object's mechanical
energy is conserved.
Answer: gravity
Explanation:
1 2 3 4 5 6 7 8 9 10
TIME REMAINING
01:57:39
A ball has a mass of 0.25 kg and is moving to the right at 1.0 m/s. It hits a ball of mass 0.15 kg that is initially at rest. After the collision, the 0.15 kg ball moves off to the right with a velocity of 0.75 m/s.
What is the final velocity of the 0.25 kg ball?
0.42 m/s to the right
0.42 m/s to the left
0.55 m/s to the right
0.55 m/s to the left
Answer:
C. 0.55 m/s towards the rightExplanation:
Using the conservation of law of momentum which states that the sum of momentum of bodies before collision is equal to the sum of the bodies after collision.
Momentum = Mass (M) * Velocity(V)
BEFORE COLLISION
Momentum of 0.25kg body moving at 1.0m/s = 0.25*1 = 0.25kgm/s
Momentum of 0.15kg body moving at 0.0m/s(body at rest) = 0kgm/s
AFTER COLLISION
Momentum of 0.25kg body moving at x m/s = 0.25* x= 0.25x kgm/s
x is the final velocity of the 0.25kg ball
Momentum of 0.15kg body moving at 0.75m/s(body at rest) =
0.15 * 0.75kgm/s = 0.1125 kgm/s
Using the law of conservation of momentum;
0.25+0 = 0.25x + 0.1125
0.25x = 0.25-0.1125
0.25x = 0.1375
x = 0.1375/0.25
x = 0.55m/s
Since the 0.15 kg ball moves off to the right after collision, the 0.25 kg ball will move at 0.55 m/s towards the right
If a body goes from 10 m/s to 50 m/s in 8 seconds, what is it's acceleration?
Answer:
5 m/s²
Explanation:
Initial velocity- 10 m/s
Final velocity- 50 m/s
time= 8 Seconds
formula:
a= v-u/t
a= 50 - 10 /8
a= 40/8
a= 5m/s²
Answer: 5m/s²
Which phrase provides the best context clue for the meaning of the word tabulate?
Answer:
round and count
Explanation:
means arrange, order, organize, etc
Answer:^what he meant was record and count
Explanation:
What is the potential energy of a 3 kg rock sitting at the top of a 21 meter high cliff?
Answer:
618.03 J
Explanation:
Potential energy can be calculate using the following formula.
PE=m*g*h
where m is the mass, g is the acceleration due to gravity and h is the height.
In this situation, we have a 3 kilogram rock on a 21 meter high cliff. Therefore, the mass is 3 kg and the height is 21 m.
On Earth, the acceleration due to gravity is 9.81 m/s^2.
m=3 kg
h=21 m
g=9.81 m/s^2
Substitute these values into the formula.
PE=3*9.81*21
Multiply all the numbers together
PE=63*9.81
PE=618.03
The potential energy is 618.03 kg m^2/s^2, or 618.03 Joules
Match the labels: 1. forces 2.magnetic fields 3.electric fields 4.gravitational fields
which of the following instrument would you prefer to measure the length of table
1 vernier calliper
2screw gage
3 microscope
4meter rod
Answer:
4. meter rod
Explanation:
The length of an object is dimension that expresses how long the object is. It is measured in meters as the SI unit.
From the given question, to determine the length of a given table, the appropriate instrument that should be used is a meter rod. This would make it possible to measure in meters and know the exact dimension of the object with respect to how long it is.
A meter rod has a length of 1 m (100 cm), and can be easily used for the purpose.
you use 40 N of force to push a box of books 3.2 m along the floor how much work is being done
Answer:
128Nm
Explanation:
w=d*F
w=3.2m*40N
w=128Nm
plz mark brianliest if its correct....
Answer:
[tex] \boxed{Work \: done = 128 \: N-m} [/tex]
Explanation:
Force = 40 N
Displacement = 3.2 m
Work Done = Force × Displacement
= 40 × 3.2
= 128 N-m
If a wave were to hit a flexible, moveable surface what will it do?
what ever force the wave hit it at (on the x-axis) would create another wave from the force of the first wave. though the wave would be smaller because of other forces
metal object is earthed by connecting it to ......
Answer:
ii) Insulating materials that gain electrons when rubbed become negatively charged. c) An electric current is a flow of charge. d) An isolated metal object that is initially uncharged will gain charge if it is brought into contact with a charged object. e) A metal object is earthed by connecting it to the ground.
Explanation:
hope this helps you :)
According to the law of reflection, the angle at which light strikes a surface is
the angle at which light is reflected.
a. the same as
c. less than
b. slightly larger than
d. much larger than
Answer:
Option a
Explanation:
The light that strikes this surface is referred to as the incident ray, and the light reflected is referred to as the reflected ray - as one might have guessed. Respectively, the angle with which the incident ray struck the surface is known as the " incident angle, " while the angle with which the reflected ray reflects off this surface is known as the " angle of reflection. "
_______________________________________________________
By the law of reflection, you would say that the incident angle is equal to the angle of reflection. Thus, the answer is option a.
Hope that helps!
What is the potential energy for and object with mass of 15 Kg and 20 m above the ground?
Answer:
3000J
Explanation:
The gravitational energy for any object is given by E=mgh
where m is mass, g is gravitational field strength anf h is height above ground
How does an aerofoil create lift and why does the air above the wing flow faster than below.
Answer: hey!
youre answer is
In order to meet up at the trailing edge, the molecules going over the top of the wing must travel faster than the molecules moving under the wing. Because the upper flow is faster, then, from Bernoulli's equation, the pressure is lower. The difference in pressure across the airfoil produces the lift.
Airplane wings are shaped to make air move faster over the top of the wing. When air moves faster, the pressure of the air decreases. So the pressure on the top of the wing is less than the pressure on the bottom of the wing. The difference in pressure creates a force on the wing that lifts the wing up into the air.
Bernoulli's Principle, states that pressure decreases when air moves faster. Air moves faster over the top of a wing, which results in an area of lower pressure. Meanwhile, the bottom of the wing experiences higher pressure. Camber increases the difference in air pressure between the top and bottom surfaces.
Explanation:
pls put brainliest
hope this helps
Which equations represent the relationship between wavelength and frequency for a sound wave?
Explanation:
The relationship of the speed of sound, its frequency, and wavelength is the same as for all waves: vw = fλ, where vw is the speed of sound, f is its frequency, and λ is its wavelength.
The
it takes to recognize a
and your body responding to it.
Blank 1:
Blank 2:
What is the work done by a force equivalent to the weight of 100kg that moves an object 200km in 7.0min?
Please guys can somebody helps me :(
The work done by a force equivalent to the weight of 100 kg that moves an object 200 km in 7.0 min would be 196000 kJ.
What is work done?The total amount of energy transferred when a force is applied to move an object through some distance
The work done is the multiplication of applied force with displacement.
Work Done = Force × Displacement
As given in the problem we have to calculate the work done by a force equivalent to the weight of 100 kg that moves an object 200 km in 7.0 min.
The weight of the 100 kg = 100 × 9.8
= 980 N
The work done = 980 × 200 × 1000
= 196000000
= 196000 kJ
Thus, the work done by a force equivalent to the weight of 100 kg that moves an object 200 km in 7.0 min would be 196000 kJ.
To learn more about the work done here, refer to the link given below ;
brainly.com/question/13662169
#SPJ2
is the thermal energy transferred in a refrigerator primarily by conduction,convection or radiation? explain your answer
Answer: Convection
Explanation: convection is the most present process in the refrigeration equipment you may deal with. It occurs mainly in the fluids
Okno okrętu podwodnego ma powierzchnię 0,3 m2 i znajduje się na głębokości, na której ciśnienie wywierane przez słup wody wynosi 500 kPa. Dokończ zdanie. Wartość siły parcia wody na okno wynosi.
Answer:
The value of the water pressure force on the window is 150,000 N.
Wartość siły nacisku wody na okno wynosi 150000 N.
Explanation:
English Translation
The submarine window has an area of 0.3 m2 and is located at a depth at which the pressure exerted by the water column is 500 kPa. Finish the sentence. The value of the water pressure force on the window is.
Solution.
Pressure exerted by a force on a surface area perpendicular to the line of action of that force is given by the formula
P = (F/A)
where F = applied force, in this case, water pressure force on the window = ?
A = Area upon which the force is acting = Area of the window = 0.3 m²
P = 500 kPa = 500,000 Pa
500,000 = (F/0.3)
F = 500,000 × 0.3 = 150,000 N
In Polish/Po Polsku
Ciśnienie wywierane przez siłę na pole powierzchni prostopadłe do linii działania tej siły jest określone wzorem
P = (F / A)
gdzie F = przyłożona siła, w tym przypadku siła nacisku wody na okno =?
A = Obszar, na który działa siła = Powierzchnia okna = 0,3 m²
P = 500 kPa = 500000 Pa
500,000 = (F/0.3)
F = 500,000 × 0.3 = 150,000 N
Hope this Helps!!!
Mam nadzieję że to pomoże!!!
What is Yusef most likely finding?
Explanation:
yusef adds all of the values in his data set and then divide by the number of values in the set. the actual density of iron is 7.874 g/ml .
A crate is being pushed at a constant speed across the floor. The gravitational force on the crate is 80N, and the applied force is 50N. What are the other force(s) acting on the crate?
Answer:
Friction force.
Explanation:
Force is defined as a pull or push acting on an object that changes the speed or direction of the motion.
When a crate is is being pushed at a constant speed across the floor along with gravitational force and the applied force, there will be a force of friction applied by the floor on the opposite direction of applied force.
Friction always opposes the applied force and resist the changes in the motion of the object.
Hence, the correct option is Friction force.