Answer:
10.2 metres
Explanation:
Given that a ball is projected at an initial speed of 20.0 meter per second making an angle of 45.0 with horizontal. What is the maximum height it will reach?
Solution
To get the maximum height, let us use the formula
V^2 = U^2 sin^2ø - 2gH
At maximum height V = 0
U^2 sin^2ø = 2gH
Substitute all the parameters into the formula
20^2 ( sin 45 )^2 = 2 × 9.8 × H
400 × 0.5 = 19.6 H
Make H the subject of formula
H = 200 / 19.6
H = 10.204 metres.
Therefore, the maximum height reached by the projected ball is 10.2 metres.
Question 9 of 10
How many carbon (C) atoms are in a molecule of CH20?
A. 3
B. 1
C. 2
D. 4
(answer-1)
Answer:
I believe the correct answer is B.." 1 "
Explanation:
hope it helps! ;)
Un tren emite un sonido a 480hz determina la frecuencia que percibe el observador cuando el observador se aleja a 12m/s del tren que ha quedado en reposo velocidad del sonido en el aire 340m/s
Answer:
La frecuencia que percibe el observador es 463 Hz.
Explanation:
El efecto Doppler se define como el cambio de frecuencia aparente de una onda producida por el movimiento relativo de la fuente respecto a su observador. En otras palabras, este efecto es el cambio en la frecuencia percibida de cualquier movimiento ondulatorio cuando el emisor y el receptor, u observador, se desplazan uno respecto a otro.
La siguiente expresión se considera el caso general del efecto Doppler:
[tex]f'=f*\frac{v+-vR}{v-+vE}[/tex]
Donde:
f’, f: Frecuencia percibida por el receptor y frecuencia emitida por el emisor respectivamente. Su unidad de medida en el Sistema Internacional (S.I.) es el Hertz (Hz), que es la unidad inversa del segundo (1 Hz = 1 s-1) v: Velocidad de propagación de la onda en el medio. Es constante y depende de las características del medio. En este caso se considera que la velocidad del sonido en el aire es de 340 m/s vR, vE: Velocidad del receptor y del emisor respectivamente. Su unidad de medida en el S.I. es el m/s ±, ∓:Utilizaremos el signo +:
En el numerador si el receptor se acerca al emisor
En el denominador si el emisor se aleja del receptor
Utilizaremos el signo -:
En el numerador si el receptor se aleja del emisor
En el denominador si el emisor se acerca al receptor
En este caso:
f= 480 Hzv= 340 m/svR= 12 m/s (el receptor es el observador)vE=0 (el emisor es el tren, que se encuentra en reposo)Y como el receptor se aleja del emisor, la expresión del efecto Doppler queda determinada como:
[tex]f'=480 Hz*\frac{340 m/s-12 m/s}{340 m/s-+0 m/s}[/tex]
Resolviendo se obtiene:
[tex]f'=480 Hz*\frac{340 m/s-12 m/s}{340 m/s}[/tex]
[tex]f'=480 Hz*\frac{328 m/s}{340 m/s}[/tex]
f'= 463 Hz
La frecuencia que percibe el observador es 463 Hz.
which term describes the wave phenomenon in the image
Answer: (Next time put the Image but I know what u talkin bout)
wave changes its path from its initial direction so this phenomenon is known as Refraction of wave
Explanation:
When wave travels from one medium to other medium the due to change in the speed of the wave propagation it deviates from its initial path.
The deviation of the wave from its initial path is known as refraction of wave
Here we can see that wave incident on medium 1 with some angle with the boundary
Then it enters into other medium and then travels in other direction
So here wave changes its path from its initial direction so this phenomenon is known as Refraction of wave
A uniform electric field exists in a region between two oppositely charged plates. An electron is released from rest at the surface of the negatively charged plate and strikes the surface of the opposite plate, 2.0 cm away, in a time 1.5 x 10-8 s. The speed of the electron in millions m/sec as it strikes the second plate is: A. 13.3 B. 133 C. 2.67 D. 26.7 E. 534
Answer:
A. 13.3
Explanation:
First, we find the velocity of the electron in meters/sec, as follows:
[tex]v = \frac{d}{t}\\[/tex]
v = velocity of electron = ?
d = distance between plates = 2 cm = 0.02 m
t = time elapsed = 1.5 x 10⁻⁸ s
Therefore, using these values in the equation, we get:
[tex]v = \frac{0.02\ m}{1.5\ x\ 10^{-8}\ s}\\\\v = 1333333.33\ m/s[/tex]
Now, we convert this to million m/s:
[tex]v = (1333333.33\ m/s)\frac{1\ million\ m}{100000\ m}\\\\v =13.3\ million\ m/s[/tex]
Therefore, the correct answer is:
A. 13.3
Determine the momentum of a 13,000kg semi driving at 30 m/s
Answer:
390000
Explanation:
The momentum is huge. You wouldn't want this thing to hit you.
Momentum = m*v
m = 13000 kg
v = 30 m/s
Momentum = 13000 * 30
Momentum = 390000 kg m/s
Answer all of these questions and you will get the brain list
Answer:
1. Mechanical energy = 298.4 Joules.
2. Mechanical energy = 2140 Joules.
3. Mechanical energy = 0.2838 Joules.
Explanation:
Kinetic energy can be defined as an energy possessed by an object or body due to its motion.
Mathematically, kinetic energy is given by the formula;
[tex] K.E = \frac{1}{2}MV^{2}[/tex]
Where;
K.E represents kinetic energy measured in Joules.
M represents mass measured in kilograms.
V represents velocity measured in metres per seconds square.
Potential energy can be defined as an energy possessed by an object or body due to its position.
Mathematically, potential energy is given by the formula;
[tex] P.E = mgh[/tex]
Where,
P.E represents potential energy measured in Joules.
m represents the mass of an object.
g represents acceleration due to gravity measured in meters per seconds square.
h represents the height measured in meters.
Given the following data;
1. Kinetic energy = 182.2 J
Potential energy = 116.2 J
To find the mechanical energy;
Mechanical energy = kinetic energy + potential energy
Mechanical energy = 182.2 + 116.2
Mechanical energy = 298.4 Joules.
2. Mass = 40kg
Velocity = 3m/s
Height = 5m
We know that acceleration due to gravity is equal to 9.8m/s²
To find the mechanical energy;
We would determine the kinetic and potential energy respectively.
K.E = ½mv²
K.E = ½*40*3²
K.E = 20*9
K.E = 180 Joules.
P.E = mgh
P.E = 40*9.8*5
P.E = = 1960 Joules
Mechanical energy = K.E + P.E
Mechanical energy = 180 + 1960
Mechanical energy = 2140 Joules.
3. Mass = 0.002kg
Height = 3m
Velocity = 15m/s
To find the mechanical energy;
K.E = ½mv²
K.E = ½*0.002*15²
K.E = 0.001*225
K.E = 0.225 Joules.
P.E = mgh
P.E = 0.002*9.8*3
P.E = = 0.0588 Joules
Mechanical energy = K.E + P.E
Mechanical energy = 0.225 + 0.0588
Mechanical energy = 0.2838 Joules.
Please help Solve! I need help!
Question:
Jermaine runs exactly 2 laps around a 400-meter track. What is the displacement?
Multiple choice answers (I need help I don't understand I don't know what the answer is PLEASE HELP ME):
a. 200
b. 800
c. 400
d. 0
D
Explanation
Given,
Distance covered in 1 lap = 400m
= Distance covered in 2 laps = 400 × 2
=800m
If Jermaine runs 2 whole laps, she comes back to her starting point.
So the answer is 0m
compute the velocity of an object orbiting at height 2Re above the surface of earth
Answer:
The orbital speed can be found using v = SQRT(G*M/R). The R value (radius of orbit) is the earth's radius plus the height above the earth - in this case, 6.59 x 106 m.
The velocity of an object orbiting at height 2Re above the surface of earth be 14380 m/s.
What is velocity?The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.
The orbital velocity of an object orbiting around the Earth can be expressed as:
v = √(GM/R).
Where:
G = universal gravitational constant = 6.67408 × 10⁻¹¹N m² kg⁻².
M = mass of Earth = 5.97219 × 10²⁴ kilograms.
R = distance between the object and the center of Earth.
According to the question, the object orbiting at height 2[tex]R_e[/tex] above the surface of earth. So, distance between the object and the center of Earth is: R = radius of Earth + 2[tex]R_e[/tex]
= 3[tex]R_e[/tex]
= 3 × 6,371 km
= 1.9113 × 10⁶ m.
So, the velocity of the object : v = √(GM/R).
= √( 6.67408 × 10⁻¹¹× 5.97219 × 10²⁴/1.9113 × 10⁶ ) m/s
= 14380 m/s.
Hence, the velocity of the object be 14380 m/s.
Learn more about velocity here:
https://brainly.com/question/18084516
#SPJ2
a = F/m is an explanation of
in  Physics
Answer:
The equation a=F/m or the acceleration is equal to the net force of an object divided by that object's mass, is an equation derived and explained by Sir Issac Newton's second law of motion. Newton's second law of motion states that the force of an object is equal to the mass times the acceleration of that object.
When a lift is accelerating downward that a=g then the net force acting on the object is: (a)F=0N (b)F=mg (c)F=w-mg (d) F=w_ma
Answer:
the answers the correct one is A
F = 0
Explanation:
To find the net force we must apply Newton's second law
F -W = ma
where the upward direction is positive, they indicate that the acceleration is equal to = - g
F = W - m g
the weight of a body of W = mg
we substitute
F = mg - mg
F = 0
The check the answers the correct one is A
A circuit has two batteries and a resistor as shown. In the figure, the terminal voltage of the 12 V battery is closest to _____.
a. 15.6 V
b. 13.2 V
c. 8.4 V
d. 10.8 V
e. 9.6 V
Answer:
a 15.6voltz
i Hope this helps
A bat with a mass of 0.35 kg travels at a rate of 15 m/s. What is the animal's momentum?
Answer:
momentum= mass x velocity = 0.35x15= 5.25kgm/s
What causes "changing" motion?
Balanced forces
Unbalanced Forces
Steady Motion
The force
Answer:listen to class
Explanation:
-1
Answer:
Unbalanced Forces
Explanation:
According to the Newton's First law, it states that an object either remains at rest or continues to move at a constant velocity, unless it is acted upon by an external force. The answer is Unbalanced Forces
When a pendulum is at the center position, what is true of the kinetic and potential energy?
A.
Both potential energy and kinetic energy are at their minimum values.
B.
Both potential energy and kinetic energy are at their maximum values.
X c.
Potential energy is maximum and kinetic energy is minimum.
D.
Kinetic energy is maximum and potential energy is minimum.
Answer:
C is the answer to your question
Answer:
D.
Kinetic energy is maximum and potential energy is minimum.
Explanation:
What is a fact about incline planes?
True or False : 0°K=-273.15° C and 0°C (Celsius) = 273.150K
Answer:
TRUE
Explanation:
Some people today claim the Earth is flat. Produce an argument to prove that the
Earth is not flat.
Answer:
i mean i think it is. we have no real pics of the earth they are all fake. And the moon landing was fake. the usa flag was blowing but there is no wind in space . its all fake
Explanation:
reason why the clinical thermometer has a long cylindrical bulb and not spherical bulb
Answer: One of the factors of the rate of heat transfer is the amount of surface area contact of the thermometer and the object whose temperature is being measured. By using a cylindrical bulb, rather than a spherical bulb, the time to get an accurate temperature is reduced. hope this helps. Can u give me brainliest
Explanation:
Answer:
it is because by using a cylindrical bulb,rather than a spherical bulb,the time to get to an accurate temperature is reduced. If you place the bulb of a mercury thermometer made of glass in boiling water you can see that the column of the mecury falls before rising
How much thermal energy is absorbed when 145 g of water at 23ºC is heated until it boils and turns into vapour?
Answer:
the thermal energy absorbed is 46,893 J
Explanation:
Given;
mass of the water, m = 145 g = 0.145 kg
initial temperature of the water, t₁ = 23 ⁰C
final temperature of the water, t₂ = 100 ⁰C
specific heat capacity of water, c = 4,200 J/kg.⁰C
The thermal energy absorbed is calculated as;
H = mcΔt
H = 0.145 x 4,200 x (100 - 23)
H = 46,893J
Therefore, the thermal energy absorbed is 46,893J
Newton's first law states that objects do not change their velocity unless acted upon
by an outside force. When throwing a ball the ball initially accelerates from the force
provided by your arm and then begins to slow down.
What force(s) are responsible for the deceleration of the ball?
Answer:
Air resistance/Drag (this is the proper term for air resistance) or gravity or friction
It depends on the direction and if you throw it across a surface or if you throw it straight upwards.
I hope this helps!!
Answer:
Newton's first law: An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force.
Explanation:
Read the article Watering Livestock with Renewable Energy.
Why does it make sense for ranchers to use renewable energy to pump water?
Animals do not need water during the summer.
In most of the United States, there is not enough wind to run pumping systems.
Solar energy is strongest in the winter, when water is needed for animals and crops.
Wind and solar energy help save money and reduce air pollution.
Answer:
D. Wind and solar energy help save money and reduce air pollution.
Explanation:
Answer:
d
Explanation:
edge 2021
How does current flow in a standard DC circuit?
Changing direction at a regular frequency.
Directly to the resistor and back.
From the positive to the negative terminal.
From the negative to the positive termina
Answer:
A
Explanation:
Please answer this so you get the brainlist
Answer: Potential Energy
Explanation:
This picture is potential energy as the boulder is not quite moving yet, although due to the hill the boulder has the Potential to move when it is pushed down the hill.
Exercising at light, moderate, or vigorous level is referring to the
a
frequency
b
intensity
c
time
d
type
Answer is in the file below
tinyurl.com/wpazsebu
PLEASE HELP!!!!!!!!!!!!!
a. A light wave travels through glass (n=1.5) at an angle of 28°. What angle does it have when
it passes from the glass into water (n = 1.33)?
B. Draw a ray diagram to locate the image of the object below. Write one or two sentences to describe the type of image, it’s size relative to the object, and it’s position with respect to the lens.
C. An object is located 94.0 cm from a concave mirror. The focal length is 34.0 cm. What is the image distance? Is the image real or virtual??
D. An Object is located 65.0 cm from a concave lens. The image distance is -11.8 cm. What is the magnification?
E. For a person who is nearsighted, seeing objects that are far away is difficult. The light from these objects does not get focused far enough back in the eye. Write one or two sentences to identify the type of lens that can be used to correct nearsightedness and describe why it works.
PLEAAAASE HELP MEEE
Answer:
A. The angle with which the light passes from glass into water is approximately 31.97°
B. The image formed is, real, inverted, and smaller than the object
C. The image distance is 53.2[tex]\overline 6[/tex] cm
The image is real
D. The magnification is approximately 0.182
E. The type of lens required is a concave lens which corrects the focus of a powerful eye lens or a long eyeball
Explanation:
The given parameters for the light wave are;
The refractive index of the glass medium, n₁ = 1.5
The angle of incidence of the light, θ₁ = 28°
The refractive index of water, n₂ = 1.33
A. Let θ₂ represent the angle with which the light passes from glass into water
Snell's law is mathematically stated as follows;
n₁·sin(θ₁) = n₂·sin(θ₂)
According to Snell's law, we have;
1.5 × sin(28°) = 1.33 × sin(θ₂)
sin(θ) = (1.5 × sin(28°))/1.33 = 0.52947920615
∴ θ₂ = arcsin(0.52947920615) ≈ 31.97°
The angle with which the light passes from glass into water, θ₂ ≈ 31.97°
B. Please find attached the drawing of the image created with Microsoft Visio
From the drawing, we have that the image formed is real inverted smaller than the object and between the focus and radius of curvature
C. The location of the object from the mirror, u = 94.0 cm
The focal length of the mirror, f = +34.0 cm
The mirror formula for a concave mirror is given as follows;
[tex]\dfrac{1}{f} = \dfrac{1}{u} + \dfrac{1}{v}[/tex]
Therefore, we have;
[tex]\dfrac{1}{34.0} = \dfrac{1}{94.0} + \dfrac{1}{v}[/tex]
[tex]\dfrac{1}{v} = \dfrac{1}{34.0} - \dfrac{1}{94.0} = \dfrac{15}{799}[/tex]
[tex]\therefore \dfrac{v}{1} = v =\dfrac{799}{15} = 56.2\overline 6[/tex]
The image distance, v = 799/15 = 53.2[tex]\overline 6[/tex] cm
Therefore the image is in front of the mirror, which is a real image
The image is real
D. The given parameters of the object and lens are;
The distance of the object from the lens, u = 65.0 cm
The distance of the image formed from the lens, i = -18 cm
The magnification, M, is given as follows;
[tex]M = \dfrac{-v}{u}[/tex]
Therefore;
[tex]M = \dfrac{-(-11.8)}{65.0} = \dfrac{59}{325} \approx 0.18153846153[/tex]
The magnification, M ≈ 0.182
E. For a person who is near sighted, the light from objects from distant location are almost parallel and are brought to a focus in front of the retina and therefore, they appear blurred
The use of a concave lens is required to correct nearsightedness as it causes the light to appear come from a point before the focus such that the divergent rays of the object refracted through the concave lens comes to a focus at the.
A neighborhood in a small Texas town had to be evacuated because the
houses were sinking due to a problem in the aquifer. What is the most
likely cause of this problem?
‼️‼️‼️ PLS HELP ‼️‼️‼️
Explanation:
Groundwater pumping and land subsidence because when compressing,squeezing or accompanying of soils in some aquifer systems can chaperon or accompanying an drastic groundwater pumping and it's far by the solitary largest caise of subsidence . Execissve pumping of such aquifer systems has ensue in permanent subsidence and regarding to ground obertion . hope that I helped you and good luck
what are the four qualities required in a healty relationship?
Answer:
Honesty. ...
Compromise. ...
Individuality. ...
Good communication. ...
Anger control. ...
Fighting fair.
Answer:
Healthy Relationships
Mutual respect. Respect means that each person values who the other is and understands the other person's boundaries.
Trust. Partners should place trust in each other and give each other the benefit of the doubt.
Honesty. ...
Compromise. ...
Individuality. ...
Good communication. ...
Anger control. ...
Fighting fair.
Assignment: Can you identify various forces and instances in which electrostatic and magnetic forces occur
Answer:
Magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion. It is the basic force responsible for such effects as the action of electric motors and the attraction of magnets for iron. Electric forces exist among stationary electric charges; both electric and magnetic forces exist among moving electric charges. The magnetic force between two moving charges may be described as the effect exerted upon either charge by a magnetic field created by the other.
Hola!!!
what is meant by Multiverse???
.
.
.
.
.
.
.
anyone here??
Explanation:
group of multiple universes
these universes comprise everything that exists: the entirety of space, time, matter, energy, information, and the physical laws and constants that describe them.
HELP YALL!!
Which nucleus completes the following equation?
Answer:
B
Explanation:
Chlorine institute
16+1=17
CI has 17 in the bottom.
Answer:C
Explanation: