The velocity of the watermelon as it hits the ground is 14.715 m/s.
Given the data in the question;
Since the Watermelon was dropped from rest,
Initial velocity of the Watermelon;[tex]u = 0m/s[/tex]Time taken for the Watermelon to hit the ground; [tex]t = 1.5s[/tex]We know that, Acceleration due to gravity; [tex]g = 9.81 m/s^2[/tex]Now, we determine the velocity of the watermelon as it hits the ground which is the final velocity.
From the First Equation of Motion:
[tex]v = u + at[/tex]
Now, under gravity, acceleration ''a" will Acceleration due to gravity;[tex]g = 9.81m/s^2[/tex], "v" is the final velocity, "u" is the initial velocity and "t" is the time taken.
So, we substitute our values into the equation
[tex]v = 0m/s\ +\ ( 9.81m/s^2\ * 1.5s )\\\\v = ( 9.81m/s^2\ * 1.5s )\\\\v = 14.715 m/s[/tex]
Therefore, the velocity of the watermelon as it hits the ground is 14.715 m/s
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Fig. 2.1 is a head-on view of an airliner flying at constant speed in a circular horizontal path.
The centre of the circle is to the left of the diagram.
The weight of the airliner is 1.20 x 10^6 N and there is an aerodynamic lift force of
1.39 x 10^6N acting to the left by drawing a scale vector
Ps: ^ to the power of
[tex]1.39[/tex] × [tex]10^{6} N[/tex] acting [tex]30^{o}[/tex] to the left of the vertical.
Constant speed:We refer to an object as traveling at a constant speed when its speed is constant and neither rises nor falls, at a continuous rate.Lift:A force is applied to an object by a fluid flowing around it. The part of this force that is perpendicular to the direction of the incoming flow is called lift. In contrast, the drag force, or portion of the force parallel to the flow direction, is the opposite. Lift typically acts upward to counteract the pull of gravity, but it can also act at an angle to the flow in any direction.The force is referred to as an aerodynamic force if the fluid is air.It is known as a hydrodynamic force in water or any other liquid.Solution -The weight of the airliner is [tex]1.20[/tex] × [tex]10^{6} N[/tex] and there is an aerodynamic lift force of [tex]1.39[/tex] × [tex]10^{6} N[/tex] acting [tex]30^{o}[/tex] to the left of the vertical.
Therefore, the airliner follows this circular path while maintaining a steady speed.
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the amount of air that can be forcefully exhaled after a normal tidal volume exhalation is called the ________.
Answer:
Expiratory Reserve Volume
Explanation:
When a 10V battery is connected to a resistor, 2A of current flows in the resistor.What is the resistors value? Formulas: V=IR, I=V/R, R=V/INote no need to write the unit in your answer.help im dying
Answer:
V = 10
I = 2
R = ?
from,
R = V/I
R = 10/2 = 5 ohms.
P.S; don't die. :))
calculate the density of a 50 ml solution that is 5% water and 95% ethanol. show your calculation.
The density of the solution from the given compositions of water and ethanol is 799.55 kg/m³.
The given parameters;
Volume of the solution, v = 50 mlComposition of water, 5%Composition of ethanol, 95%Density of water, = 1000 kg/m³Density of ethanol, = 789 kg/m³The density of the solution from the given compositions of water and ethanol is obtained by finding the respective amount of water and ethanol composition is the solution.
The density of the solution is calculated as follows;
[tex]\rho = \frac{5(1000 \ kg/m^3) + 95(789 \ kg/m^3)}{100} \\\\\rho = 799.55 \ kg/m^3[/tex]
Thus, the density of the solution from the given compositions of water and ethanol is 799.55 kg/m³.
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The answer is 799.55 kg/m3.
Which describes a phase change? (Select all that apply.)
Energy is released or absorbed.
The process is reversible.
The process moves atoms into permanent places.
The compounds transform protons into neutrons.
Answer:
Energy is released or absorbed
The process is reversible
Phase change can be described as:
Energy is released or absorbed.The process is reversible.What is phase change?The physical process of changing a medium's state from one to another is known as a phase transition (or phase change) in the domains of chemistry, thermodynamics, and other related sciences.
The phrase is frequently used to describe transitions between the three fundamental states of matter—solid, liquid, and gas—and, in rare instances, plasma.
The physical characteristics of a phase of a thermodynamic system and the states of matter are constant. Certain properties of a given medium change during a phase transition as a result of a change in the environment, such as temperature or pressure. This change can be discontinuous.
Hence, Phase change can be described as:
Energy is released or absorbed and the process is reversible.
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imagine a shopping cart of mass m, moving at a velocity of v to the right, running into a second shopping cart, of mass 3m, which is at rest.
The impulse is the product of mass and velocity. Hence, the impulse delivered by the second shopping cart is 3mv/2
Given the Parameters :
Mass of cart 1 = m Initial Velocity and direction = v toward the right Final velocity = v/2 towards the left Mass of cart 2 = 3m Velocity = 0 m/s (At rest)Impulse delivered by the second cart on the first :
Impulse = Mass × velocity
Impulse = Mass of cart 2 × final velocity of cart 1
Impulse = 3m × v/2 = 3mv/2 Ns (towards the left)
Therefore ; the impulse delivered by the second shopping cart is 3mv/2 to the left.
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A 70 kg child escapes from a burning building by walking off a roof 30 m above a catching net. Assuming that resistance is a constant 90 N on the child during their fall, calculate the person's velocity just before hitting the net.
Newton's second law and kinematics allow to find the result for the velocity at the point of reaching the child's net is:
v = 23.7 m / s
Newton's second law states that the net force is proportional to the mass and acceleration of the body.
∑ F = m a
Where F is the force, m the mass and the acceleration of the body.
In the attachment we can see a free body diagram of the system, where the positive direction is up.
F -W = m a
Weight is
W = m g
[tex]a = \frac{F}{m} - g[/tex]
Let's calculate
[tex]a= \frac{30}{70} - 9.8[/tex]
a = -9.37 m / s²
Negative indicates downward direction.
Kinematics studies the movement of the body, let's look for speed.
v² = v₀² - 2 a (y-y₀)
Where v is the speed, v₀ is the initial speed, a tha acceleration ang (y-y₀) is the eight.
As the child is released, his initial velocity is zero, upon reaching the floor his height is zero and his initial height is I = 30 m.
[tex]v= \sqrt{2 a y_o}[/tex]
Let's calculate
v = [tex]\sqrt{2 \ 9.37 \ 30}[/tex]
v = 23.7 m / s
In conclusion using Newton's second law and kinematics we can find the velocity at the point where the child reaches the net is:
v = 23.7 m / s
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The velocity of the child before hitting the ground is 22.596 m/s.
The given parameters;
mass of the child, m = 70 kgheight of the roof, h = 30 mair resistance on the child, F = 90 NThe weight of the child acting downwards is calculated as follows;
W = mg
W = 70 x 9.8
W = 686 N
The net force on the child is calculated as follows;
∑Fₙ = 686 N - 90 N
∑Fₙ = 596 N
The acceleration of the child is calculated as follows;
F = ma
[tex]a = \frac{F}{m} \\\\a = \frac{596}{70} \\\\a = 8.51 \ m/s^2[/tex]
The velocity of the child before hitting the ground is calculated as;
v² = u² + 2as
v² = 0 + (2 x 8.51 x 30)
v² = 510.6
v = √510.6
v = 22.596 m/s
Thus, the velocity of the child before hitting the ground is 22.596 m/s.
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Which statement about the universality of gravity is untrue?
a
The gravitational force between two objects depends only on their masses.
b
The gravitational force between two objects increases if the mass of one object increases.
c
The gravitational force between two objects increases if the distance between the objects decreases.
d
Any two objects that have mass also have a force of gravity acting between them, no
Answer:
Explanation:
See attachment.
a NO - it depends on distance between the masses, also.
The gravitational force between two objects depends only on their masses.
b YES - see attachment
The gravitational force between two objects increases if the mass of one object increases.
c. No - it decrease
The gravitational force between two objects increases if the distance between the objects decreases.
d. It appears the answer is incomplete (stops at . . ., no . . ). Otherwise I say YES.
Any two objects that have mass also have a force of gravity acting between them, no
Students are given the following information about a 2.0 kg, motorized toy boat on water. what net force is exerted on the boat from 4S to 8S?
The motorized toy boat experiences a net force of 0 N between 4 s and 8 s.
The motorized toy boat moves at 8 m/s (u) at 4 s and at 8 m/s (v) at 8 s. We can calculate the acceleration (a) in that period using the following kinematic expression.
[tex]a = \frac{v-u}{\Delta t} = \frac{8m/s-8m/s}{8s-4s} = 0 m/s^{2}[/tex]
The object with a mass (m) of 2.0 kg experiences an acceleration of 0 m/s². We can calculate the net force (F) in that period using Newton's second law of motion.
[tex]F = m \times a = 2.0 kg \times 0 m/s^{2} = 0 N[/tex]
The motorized toy boat experiences a net force of 0 N between 4 s and 8 s.
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help2$2$28/?$3!32$?3)3
What is the mass of an object if it accelerates at 3 m/s? and has a force of
1 N?
Answer:
1 / 3 or 0.33
that is if you meant that the object accelerates at 3 m / s² not 3 m / s
for the unit of acceleration is m / s²
Explanation:
m = ?
a = 3
f = 1N
where;
m = mass ( kg )
a = acceleration ( m / s² )
f = force ( N )
from all the parameters we are given, we can use Newton's second law of motion to solve it
that is;
a = f / m
to make m the subject of the formula, we have to cross multiply to give us;
m( a ) = f
divide through by a to give us;
m ( a ) / a = f / a
therefore,
m = f / a
so, we substitute our values to give us;
m = 1 / 3
therefore. m = 1 / 3 or 0. 33
hope this helps
thank you!!!!
A car starts from rest and retains the acceleration of 4m/s² in 20 second . calculate its final velocity.
STEP BY STEP
Given : A car starts from rest and retains the acceleration of 4m/s² in 20 second. Calculate its final velocity.
Solution : As we know that a car starts from rest so it's initial velocity should be 0 m/s. Acceleration is 4 m/s² and time taken is 20 sec. So, we need to calculate it's final velocity which we can get it usi g the first equation of motion.
First Equation of Motion : v = u + at
Putting all the required values in the formula we will get v
v = 0 + 4(20) v = 0 + 80 v = 80Henceforth, final velocity is 80 m/sec.
Which of the following keeps the planets in their orbits in the solar system?
A. Friction
B. Gravity
C. Magnetism
D. Pressure
B is the correct answer
The (blank) energy of a baseball can break a window.
1- Kinetic
2- potential
Answer:
kinetic
Explanation:
since it's energy possessed by a moving body/object.
What is an object's acceleration that takes 550.0 meters to go from 6.0 m/s to
85.0 m/s?
from,
v² = u² + 2as
where s = distance
a = (v² - u²) /2s
a = (85² - 6²) /2*550
a = 6.53m/s²
Why is Energy not created nor destroyed?
(Need the answer ASAP!!)
Since both heat and work can be measured and quantified, this is the same as saying that any change in the energy of a system must result in a corresponding change in the energy of the surroundings outside the system. In other words, energy cannot be created or destroyed.
¿Por qué crees que es importante desarrollar actividad física habitualmente, así como practicar hábitos de higiene saludable?
La actividad física posee muchos beneficios para la salud. Algunos de estos beneficios son la reducción en el riesgo de padecer enfermedades, control del peso, fortalecimiento de huesos y músculos, etc.
La actividad física regular previene la aparición de enfermedades cardiovasculares al evitar la acumulación de colesterol en las arterias que transportan sangre a diferentes áreas del organismo.
La actividad física consume calorías, especialmente aquellas provenientes de los lípidos (grasas), con lo cual permite controlar el peso y reducir el riesgo de obesidad.
La actividad física también ayuda al fortalecimiento de los tejido oseo, con lo cual previniendo enfermedades relacionadas tales como la osteoporosis.
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If the mass of an object is 35grams and it takes 7 cm3 of space ,calculate the density
Biểu diễn những lực sau đây:
a. Trọng lực của một vật 300N ( tỉ xích 0.5cm ứng với 50N )
b. Lực kéo tác dụng vào điểm A của một vật có độ lớn 1500N theo phương nằm ngang, chiều từ trái sang phải ( 1cm ứng với 500N )
Answer:
Explanation: HIII
imagine you would interview a news Anchor about how they use graphs in presentation of Science in the news think of at least four questions you would ask then imagine how they would answer your question
Answer:
The conventional wisdom of the digital era is that journalists can now know their audiences in far more intimate detail than at any other time in the history of the profession. Previously, journalists based their audience knowledge primarily on their closest social circles. Now, new tools can help them solicit readers’ feedback, analyze and understand readers’ behavior, and open new channels for conversation. These new capabilities promise to shine a light on the abstract audience — making one’s readers present, quantified and real
pls need an answer asap
c] Electrons
Electron gets transferred
Drag the correct object from the left to the statement that goes with it at the right. Use each choice only once. ResetHelp generates energy deep in its core through the fusion of hydrogen into helium has a single moon that is surprisingly large compared to its planet. is orbited by at least two geologically active moons: Titan and Enceladus. has a large moon, Triton, that almost certainly once orbited the Sun independently. has a surface hot enough to melt lead as a result of an extremely strong greenhouse effect. has an axis tilt that gives it very extreme seasons. was studied up close in 2015 by the New Horizons spacecraft. has no surface liquid water today, but shows clear evidence of such water in the distant past. has a famous storm known as the Great Red Spot. is similar in size to Pluto and also considered a dwarf planet. has a greater difference in temperature between its day and night sides than any other world.
The solar system is bounded together by gravity, and is made up of the Sun eight planets and dwarf planets
The correct options are;
The Sun ⇒ generates energy deep in its core through the fusion of hydrogen and into heliumEarth ⇒ has a single moon that is surprisingly large compared to its planetSaturn ⇒ is orbited by at least two geologically active moons: Titan and EnceladusNeptune ⇒ has a large moon, Triton, that almost certainly once orbited the Sun independentlyVenus ⇒ has a surface hot enough to melt led as a result of extremely strong greenhouse effectUranus ⇒ has an axis tilt that gives it very extreme seasonsPluto ⇒ was studied up close in 2015 by the New Horizons spacecraft.Mars ⇒has no surface liquid water today, but shows clear evidence of such water in the distant pastJupiter ⇒ has a famous storm known as the Great Red SpotEris ⇒ is similar in size to Pluto and also considered a dwarf planetMercury ⇒ has a greater difference in temperature between its day and night sides than any other worldReasons:
The Sun generates energy by nuclear fusion in its cores
The size of the Moon more than a quarter of the Earth's size
Saturn moon Titan shows signs of volcanic activity
The moon Triton rotates in the opposite direction to the rotation of Neptune
Venus is the second closest planet to the Sun with a thick CO₂ atmosphere, resulting in a greenhouse effect that makes the planet 510°C hotter
Uranus has seasons that last for approximately 20 years
The New Horizons spacecraft took 9.5 years to reach Pluto after the mission was launched in 2006
Mars liquid water disappeared billions of years ago
The Great Red Spot storm has lasted for over 300 year
Eris, one of the largest dwarf planets and is further from the Sun than Pluto
The difference in temperature between the day and night sides of Mercury is 427°C - (-180°C) ≈ 607°C
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PLS HELP, 20 POINTS
Which statement accurately describes the motion of the object in the graph above?
A. It moved from 3 cm to 10 cm at a constant speed of 2 cm/s.
B. It moved from 0 cm to 6 cm at an average speed of 1 cm/s.
C. It moved from 0 cm to 10 cm at an average speed of 2 cm/s.
D. It moved from 3 cm to 6 cm at a constant speed of 3 cm/s.
Answer:
A. It moved from 3 cm to 10 cm at a constant speed of 2 cm/s.
Explanation:
Just took the quiz.
It moved from 3 cm to 6 cm at a constant speed of 3 cm/s. This statement accurately describes the motion of the object in the graph above
What is motion of object ?
An object is said to be in motion , if its position changes with respect to its surroundings and time.
A. Object's motion is from 3 cm to 10 cm at a constant speed of 2 cm/s
let us check
time = 7 sec
distance = 10 - 3 = 7 sec
speed = distance / time = 7/7 = 1 m/s
wrong option
B. Object's motion is from 0 cm to 6 cm at an average speed of 1 cm/s.
distance = 6 cm
time = 7.5 sec
speed = 6/7.5 = 0.8 m/s
wrong option
C. Object's motion is from 0 cm to 10 cm at an average speed of 2 cm/s.
distance = 10 cm
time = 9 sec
speed = 10 / 9 = 1.11 m/s
wrong option
D. Object's motion is from 3 cm to 6 cm at a constant speed of 3 cm/s.
distance = 6-3 = 3 cm
time = 7.5 - 6.5 = 1 sec
speed = 3 /1 = 3 m/s
correct option D. It moved from 3 cm to 6 cm at a constant speed of 3 cm/s.
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how are wavelength, frequency, and energy related for photons of light?
The wavelength and the frequency of the light are inversely proportional to each other, the multiplication of the wavelength and the frequency of the light is equal to the speed of the light.
What is Wavelength?It can be understood in terms of the distance between any two similar successive points across any wave for example wavelength can be calculated by measuring the distance between any two successive crests.
C = λν
As given in the problem we have to find out how are wavelength, frequency, and energy-related to photons of light,
The relationship between the wavelength and the frequency of light is inverse, and the product of the wavelength and the frequency equals the speed of light.
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has your doctor ever said that you should only do physical activity? yes or no
No,
Doctor not only advice for physical activity but also for social and mental activities
Answer:
No
Explanation:
Your doctor wouldn't said anyone to do only physical activities.Physical activities is not enough.You should be mentally fit as well as physicallyFor mental fitness you should do mental activitiesCalculate the following:
D = 35 m
T = 17 sec
V = ?
What are solar flares, and how do they impact Earth?
Answer:
Explanation:
Flares occur in active regions around sunspots, where intense magnetic fields penetrate the photosphere to link the corona to the solar interior. ... X-rays and UV radiation emitted by solar flares can affect Earth's ionosphere and disrupt long-range radio communications.
How much time would it take for the sound of Thunder to travel 2000 meters if sound travels a speed of 330 meters per sec.
Answer:
6.06 seconds i believe (rounded)
i just divided.
напряженность поля в некоторой точке 0,8 кН/кл определите величину силы,с которой поле будет в этой точке действовать на заряд 2,5мкКл
Answer:
напряженность поля в некоторой точке 0,8 кН/кл определите величину силы,с которой поле будет в этой точке действовать на заряд 2,5мкКл 00