Answer:
Freefall is a special case of motion with constant acceleration because acceleration due to gravity is always constant and downward. This is true even when an object is thrown upward or has zero velocity.
When a ball is thrown up in the air, its velocity is initially upward. Since gravity pulls the object toward the earth with a constant acceleration g, the magnitude of velocity decreases as the ball approaches maximum height. At the highest point in its route, the ball has zero velocity, and the magnitude of velocity increases again as the ball falls back toward the earth.
Answer:
Acceleration from gravity is always constant and downward, but the direction and magnitude of velocity change. At the highest point in its trajectory, the ball has zero velocity, and the magnitude of velocity increases again as the ball falls back toward the earth
Explanation:
how does a culture
of a community influence the life style of people.
plz answer with a nice explanation
I will give u like and follow u and also give u branist ok plz help
What will be the change in "velocity" of a 991 kg car if a force of 31,770 N is applied to it for 0.4 seconds?
Answer: [tex]12.82\ m/s[/tex]
Explanation:
Given
Mass of car [tex]m=991\ kg[/tex]
Force applied [tex]F=31,770\ N[/tex]
time period [tex]t=0.4\ s[/tex]
Acceleration associated with car
[tex]\Rightarrow a=\dfrac{F}{m}\\\\\Rightarrow a=\dfrac{31770}{991}\\\\\Rightarrow a=32.05\ m/s^2[/tex]
Acceleration is the change in velocity w.r.t time
[tex]\Rightarrow a=\dfrac{\Delta v}{\Delta t}\\\\\Rightarrow 32.05=\dfrac{\Delta v}{0.4}\\\\\Rightarrow \Delta v=12.82\ m/s[/tex]
thus, the change in velocity is [tex]12.82\ m/s[/tex]
A couple is sitting side-by-side. By what factor should the distance between them be changed by if the attractive force is to be halved?
Answer:
the distance should be changed by a factor of √2
Explanation:
The attractive force between the couples can be given by Newton's Law of Gravitation:
[tex]F =\frac{Gm_1m_2}{r^2}[/tex]
where,
F = Attractive Force
G = Universal Gravitational Constant
m₁ = mass of the first person
m₂ = mass of the second person
r = distance between them
Now, if we want to halve the force without changing masses, hen:
[tex]F' = \frac{1}{2} F = \frac{1}{2} \frac{Gm_1m_2}{r^2}\\\\F' = \frac{1}{2} F = \frac{Gm_1m_2}{(\sqrt{2}r)^2}[/tex]
Hence, it is clear that the distance should be changed by a factor of √2
What is SI unit of energy?
Answer:
the SI unir of enery is joule
In a chemical reaction, the substances that interact are called the reactants.
A. True
B. False
Answer:
true
Explanation:
In a chemical reaction, the atoms and molecules that interact with each other are called reactants. In a chemical reaction, the atoms and molecules produced by the reaction are called products. In a chemical reaction, only the atoms present in the reactants can end up in the products.
pls somebody help there is a blank space between this and the question its screenshotted just look down
Answer:
This relationship is from Newtons Second Law of Motion
Newton's second law shows that there is a direct relationship between force and acceleration. The greater the force that is applied to an object of a given mass, the more the object will accelerate.
Its expressed as
F=ma
what is meant by one watt power?
Answer:
one watt power is defined as power produced when one joule of work is done in one second.
hope it helps
stay safe healthy and happy
Protective equipment and protective measures help keep all types of workers safe on the job.
true or false?
When a traffic light turns from red to green, it takes much more force and time for a large truck to get going than it does a small, compact car. This is an example of which law of motion?
Answer:
First Law of Motion.
Explanation:
Inertia can be defined as the tendency of an object or a body to continue in its state of motion or remain at rest unless acted upon by an external force.
In physics, Sir Isaac Newton's First Law of Motion is known as Law of Inertia and it states that, an object or a physical body in motion will continue in its state of motion at continuous velocity (the same speed and direction) or, if at rest, will remain at rest unless acted upon by an external force.
The inertia of a physical object such as a truck is greatly dependent or influenced by its mass; the higher the quantity of matter in a truck, the greater will be its tendency to continuously remain at rest.
Hence, it would take much more force and time for a large truck to get going when the traffic light turns green than it does for a small, compact car. This is an example of the first law of motion.
How much potassium nitrate, KNO3, would completely dissolve in 100g of water at 40℃?
A. 28 grams
B. 108 grams
C. 45 grams
D. 65 grams
How much potassium nitrate, KNO3, would completely dissolve in 100g of water at 40℃?
A. 28 grams
B. 108 grams
C. 45 grams
D. 65 grams
Pls help, I'll mark brainiest I really need a good grade, so pls answer correctly
Is water still part of the cycle when it is underground? Explain.
Answer:
hi
Explanation:
A 15.0 kg box is hung from the ceiling by one rope. What is the tension on the rope?
Tension = Mass * Gravity
Tension = 15 * 9.81 = 147.15
A 2.0 kg pellet is placed in the barrel of a toy gun and is propelled by a spring of force constant 50 N/m. The spring is compressed 2m and then released. Calculate the maximum velocity of the pellet when shot horizontally. *
Answer:
10 m/s
Explanation:
Applying,
Kentic energy of the pelllet = Spring elestic energy
1/2(mv²) = 1/2ke²
mv² = ke²...................... Equation 1
Where m = mass of the pellet, v = velocity of the pellet, k = force constant of the spring, e = extension of the spring
make v the subject of the equation
v = √(ke²/m)................. Equation 2
From the question,
Given: k = 50 N/m, e = 2 m, m = 2.0 kg
Substitute these values into equation 2
v = √(50×2²/2)
v = √(50×2)
v = √(100)
v = 10 m/s
A un cuerpo de 4kg que está en reposo sobre la superficie de la tierra, se aplica durante 8seg una fuerza de 60N dirigida verticalmente hacia arriba. Calcule la altura máxima que alcanza el cuerpo.
Answer:
[tex] y_{t} = 253.94 m [/tex]
Explanation:
Para resolver este problema debemos contemplar dos tramos.
En el primer tramo, la fuerza aplicada impulsa al cuerpo a subir una altura dada debido a la aceleración que genera esa fuerza.
[tex] \Sigma F = ma [/tex]
[tex] F - P = ma [/tex]
[tex] F - mg = ma [/tex]
En donde:
F: es la fuerza aplicada = 60 N
P: es el peso del cuerpo = mg
m: es la masa del cuerpo = 4 kg
g: es la aceleración debido a la gravedad = 9.81 m/s²
a: es la aceleración
Entonces, la aceleración generada por la fuerza aplicada es:
[tex] a = \frac{F - mg}{m} = \frac{60 N - 4kg*9.81 m/s^{2}}{4 kg} = 5.19 m/s^{2} [/tex]
Ahora, debemos calcular la altura recorrida mientras el cuerpo está acelerado hacia arriba:
[tex] y_{{1}} = y_{0} + v_{0}t + \frac{1}{2}at^{2} [/tex]
En donde:
[tex] y_{1}[/tex]: es la altura final del tramo 1 =? [tex] y_{0}[/tex]: es la altura inicial = 0
[tex] v_{0}[/tex]: es la velocidad inicial = 0 (parte del reposo)
t: es el tiempo = 8 s
[tex] y_{1} = 0 + 0 + \frac{1}{2}5.19 m/s^{2}*(8 s)^{2} = 166.08 m [/tex]
Por lo tanto, mientras el cuerpo está acelerado (durante los 8 s) recorre 166.08 metros.
Ahora, en el segundo tramo el cuerpo sigue subiendo hasta alcanzar una altura máxima para luego comenzar a descender. Podemos usar la siguiente ecuación para calcular la altura recorrida.
[tex] v_{f}^{2} = v_{0}^{2} - 2gy_{2} [/tex]
En donde:
[tex] v_{f}[/tex]: es la velocidad final = 0 (en la altura máxima)
[tex] v_{0}[/tex]: es la velocidad inicial
Primero debemos encontrar la velocidad inicial en el segundo tramo, que es igual a la velocidad final del primer tramo:
[tex] v_{f} = \sqrt{v_{0} + 2ay_{1}} = \sqrt{0 + 2*5.19 m/s^{2}*166.08 m} = 41.52 m/s [/tex]
Entonces, la altura recorrida en el segundo tramo es:
[tex] y_{2} = \frac{v_{0}^{2} - v_{f}^{2}}{2g} = \frac{(41.52 m/s)^{2} - 0}{2*9.81 m/s^{2}} = 87.86 m [/tex]
Finalmente, la altura máxima es:
[tex]y_{t} = y_{1} + y_{2} = 166.08 m + 87.86 m = 253.94 m[/tex]
Espero que te sea de utilidad!
easy:- what are the instruments used in measuring temperature
Answer:
Instrumentos Para Medir La Temperatura
Termómetro de máxima y mínima:
Termómetro metálico:
Pirómetro:
Termohidrógrafo:
What distance did the boulder with a force of 24 Newtons travel if 240 joules of work was done on it?
d = 10 m
Explanation:
Work = force × distance
or
distance = work/force
= (240 J)/(24 N)
= 10 m
Your friend wants to join the school track team, and has asked for your help to determine how fast she can run. What kind of information would you need to collect to help your friend???
Answer:
you calculate a specific type of run for example 100m and it takes 20 seconds to finish and calculate the time it takes them to finish
hope this helps
have a good day :)
Explanation:
You need th information about the time period she ran and the distance she covered in that time period to analyze her speed.
What is speed?The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object. The unit of speed is a meter/second.
The generally considered unit for speed is a meter per second.
Your friend wants to join the school track team and has asked for your help to determine how fast she can run the data of her time and the length of the distance she covered in that period of time because the only way to know how fast she runs is to analyze her speed by using the distance and the time.
Thus , you need information about the time period she ran and the distance she covered in that time period to analyze her speed.
Learn more about speed from here, refer to the link;
brainly.com/question/7359669
#SPJ5
ASAP Question 3 of 10
In the diagram shown below, the blue light ray represents a ray of light
incident on a boundary between media. The diagram represents:
D
O A. indention
B. diffraction
C. reflection.
O D. refraction
Answer:
the answer is refraction, btw could u
say which grades question this is
Calculate the electrical energy use of the microwave in 120 V circuit has 7.5 A current flow, if it used for 0.05 hours
Answer:
162 KJ
Explanation:
The electrical energy can be calculated using the formula
E = V×I×t
Where, V= voltage = 120 V
I is current in ampere = 7.5 A and t is time in seconds
1 hour = 3600 sec
Therefore, 0.05 hour = 3600×0.05 = 180 sec
Substitute the values in above equation find electrical power
E = 120×7.5×180
= 162000 J
= 162 KJ
Therefore, the electrical energy use of the microwave = 162 KJ
A -0.06C charge that moves downward is in a uniform electric field with the strength of 200 N/C. What is the magnitude and direction of the force on the charge
Answer:
think it's b
Explanation:
cuz
Does anyone know what these three are? I need help!
Answer:
1. A
2. C
3. A
Explanation:
I'm so sorry if I am wrong
what is atom.......... ?
Answer: the basic unit of a chemical element.
Explanation:
An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.
hope this helps
Improving your cardiovascular endurance, such as aerobic activity, can get your heart pumping, make you sweaty, and quicken your breathing. When you give your heart this kind of workout on a regular basis, your heart will get even better at its main job - delivering ____________ to all parts of your body.
Answer:
The correct answer is - oxygen.
Explanation:
Cardiovascular endurance is the ability to do physical activity or exercise without affecting or being tired for a longer time period. Aerobic exercise or activity can help to increase cardiovascular endurance.
Improving the cardiovascular system helps in delivering oxygen as per the demands with the help of the heart that pumps the oxygen-rich blood to different organs of an individual and lungs by inhaling enough oxygen.
Which statement correctly describes magnetic field lines?
Answer: I believe the correct answer would be they join north pole to south pole. The direction of these lines always goes from the direction of north to south pole. These lines forms loops in order to favor the way which requires or has less resistance. Hope this helps.
Why do power plants worry about the resistance of the wires?
( PHYSICAL SCIENCE )
Answer:
Resistors restrict current flow through a circuit.
(The electrons don't easily get from one side to the other)
High voltage is actually needed for to send power over long distances because if you use high current, a lot of the power is lost to the resistance in the wires.
Explanation:
hope it helps <3
The information shows the masses after the compounds are balanced.
2MgO + 2Cl2 → 2MgCl2 + O2
85g + 156g → 188g + ?
If the following materials are used during the reaction of magnesium, oxygen, and chlorine, what mass oxygen would we expect to see after the reaction and why?
A. 53g of O2, because all mass must be conserved.
B. 241g of O2, because all mass must be conserved.
C. 42.5g of O2, because all mass must be conserved, it would be half of the compound MgO in the products.
D. 106g of O2, because all mass must be conserved, it would be double the compound MgO in the products.
Pls answer correctly I really need a good grade on this.
Answer:
The information shows the masses after the compounds are balanced.
2MgO + 2Cl2 → 2MgCl2 + O2
85g + 156g → 188g + 53g
53gas total mass in reactant is equal to product.
A.
53g of O2, because all mass must be conserved.
How many hydrogen atoms can bond with this oxygen atom?
Oxygen atom
Question 2 options:
1
6
4
2
Answer:
2
Explanation:
15 points for each answer also I will report silly-bop answers!
One group of students did an experiment to study the movement of ocean water. The steps of the experiment are listed below.
Fill a rectangular baking glass dish with water.
Place a lighted lamp near the left edge of the dish.
Place a plastic bag with ice in the water near the right edge of the dish.
Put a few drops of ink in the water.
Observe the ink flow from the side where the lamp is placed towards the side where the ice bag is placed.
What does the students' experiment most likely demonstrate?
A. Surface-water sinks when heated.
B. Surface water moves from colder to warmer regions.
C. Surface water moves from warmer to colder regions.
D. Surface water moves irrespective of water temperature.
Answer:
Its D
Explanation:
The lamp and the ice bag were at the same place.
Sounds like the experiment was intended to show on a small scale ocean currents from the poles to the equator and back to the poles. The bag of ice would simulate the cold at the poles while the lamp would simulate the heat provided by the sun near the equator. With that in mind, let's look at the possible flaws and see what is likely.
Not enough ink was added
Electromagnetic waves are transverse waves. They consist of traveling electric and magnetic fields which oscillate periodically. What angle does the electric field make with the magnetic field in an electromagnetic wave?
A.) 30
B.) 45
C.) 60
D.) 90
Answer:
The answer is D.) 90
Explanation:
the electromagnetic wave is a transverse wave. the electric field makes an angle of 90° with the magnetic field. both these fields, in turn, make an angle of 90° with the direction of movement of the wave.