Answer:
The answer is 1.
Explanation:
A 40 kg girl is pushing a 40 kg boy in a 20 kg toy wagon. The wagon is moving at a constant speed of 2.0 m/s. Calculate the combined kinetic energy of the boyWhat is the acceleration of a 50 kg object pushed with a force of 500 newtons?
Answer:
Combined kinetic energy =120 joules
Acceleration= [tex]10 m/s^2[/tex]
Explanation:
Given that the mass of the girl= 40 kg.
The mass of the boy= 40 kg.
The mass of the wagon = 20 kg.
The combined velocity of the boy and the wagon, v= 2.0 m/s.
The kinetic energy of any object having mass m and moving with the speed of v m/s, is
K.E.= [tex]\frac 1 2 mv^2[/tex].
Here, the combined mass of the boy and the wagon = 40 + 20 = 60 kg.
So, the combined kinetic energy of the boy and the wagon
[tex]=\frac 12 60 \times 2^2= 120[/tex] J
When a force is applied on the object having the mass m, then
F=ma,
where a is the acceleration produced in the object.
Here, F=500 newtons and m= 50 kg.
so, [tex]500=50\times a[/tex]
[tex]\Rightarrow a = 500/50=10 m/s^2[/tex].
Hence, the combined energy is 120 joules and the acceleration is 10 [tex]m/s^2[/tex].
can someone please answer these in the next 20 minutes. ill give you a brainiest. thanks! :)
Answer:
1. 2380m
2. 13.6m
3. 132 Hz
What is the developmental period during which a person will experience the most amount of physical change?
A. middle childhood
B. adolescence
C. early adulthood
D. late adulthood
Please select the best answer from the choices provided.
B
ОООО
C
Answer:
adolescence:)
Explanation:
Adolescence is the developmental period during which a person will experience the most amount of physical change. So, the correct option is B.
What is meant by periods of development ?The periods of development of a person is defined as the period of time or the stages of life during which the person grows up from an infant to an adult.
Here,
The developmental period of humans includes the different stages of their life such as infancy, early childhood, middle childhood, adolescence, early adulthood, middle adulthood and old age.
Adolescence is an important developmental period of a person that results in the more amount of physical changes in their body.
The physical changes that are occurring inside and out of the body during the period of adolescence is known as puberty. This happens due to the release and variations of some hormones in our body.
The physical changes that happens to our body during adolescence includes the change in body structure and shape, formation of facial hair and pubic hair, change in voice, etc.
During puberty stage, a hormone called testosterone or male hormone is released in boys.
A hormone called estrogen is released during puberty in girls.
These hormonal actions causes the various physical changes in the body.
Hence,
Adolescence is the developmental period during which a person will experience the most amount of physical change.
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An object is traveling with a constant velocity of 5 m/s. How far will it have gone after 7 s?
Answer:
35 miles
Explanation:
5 times 7
Which shows the correct angle of reflection given the incident ray shown?
[tex]\mathfrak{\huge{\pink{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the Concept of the Rays of light.
Since we know that, The light ray on a shiny surface makes a angle with the normal, hence The Angle of incidence is equal to angle of reflection made with Normal Axis in the middle.
Thus Option c.) is correct.
C.) is the Answer.
The angle of reflection given the incident ray from the given diagrams is option C.
What is the refraction of light?When a light ray strikes the shining surfaces, the part of the light gets refracted. The bouncing back of the light is called reflection. When the light strikes the surface is called an incident ray.
When the light ray incident on the surface, the light returns back to the same medium is called reflection. The laws of reflection are, the angle of incidence is equal to the angle of reflection, and the incident ray, reflected ray, and normal takes place in the same plane. The speed of light remains the same in the process of reflection.
The reflected light ray changes the path of direction in the same medium. When a light ray enters from one medium to another, the speed of light gets decreases.
Thus, the ideal solution is option C.
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A 200kg car is coasting to the right and slowing down due to a friction force of 200N.
By Newton's second law, the net force on the car is
∑ F = m a
where m is the mass of the car and a is magnitude of the acceleration.
The car is slowing down, so the net force opposes the direction in which the car is moving. Vertically, the car is in equilibrium, the net force is entirely due to friction. Taking the direction opposite the car's motion to be negative, we have
- 200 N = (200 kg) (-a)
a = (200 kg) / (200 N)
a = 1 m/s²
If you're also supposed to find the coefficient of kinetic friction, use the fact that the car the vertical forces cancel out, namely
n + (-w) = 0
where n is the magnitude of the normal force and w is the car's weight. The friction force f is proportional to the normal force n by a factor of µ, the coefficient of kinetic friction, such that f = µ n. Then
f / µ = w
(200 N) / µ = (200 kg) (9.80 m/s²)
µ = (200 N) / ((200 kg) (9.80 m/s²))
µ ≈ 0.102
Plzzz help me I will mark you brainiest
Answer:
The force is Centripetal force
Mars has two moons. What does the orbital speed of these moons depend on?
Answer:
their masses and their distances from Mars
Explanation:
Hope this helped
Also can u pls mark me brainliest
Tanya randhawa is standing on top of a train that is traveling at 7 km/sec. The train hits a cow and comes to a complete stop. There is no gravity or friction in Tanyas world. According to newton's first law what happens to tanya
Answer:
Since there is no gravity or friction in Tanya's world, according to Newton's first law she will keep moving at a constant speed.
Explanation:
Newton's First Law, or also called the Law of Inertia, postulates that every body that is not subjected to any interaction (free or isolated body) remains at rest or moves with constant speed. In other words, it is not possible for a body to change its initial state (whether of rest or motion) unless one or more forces intervene.
In this law then the net force (Σ F) applied on a body is equal to zero and explains that to modify the state of motion of a body it is necessary to act on it.
Tanya randhawa is standing on top of a train traveling at 7 km / sec and the train collides with a cow and comes to a complete stop. Since there is no gravity or friction in Tanya's world, according to Newton's first law she will keep moving at a constant speed.
Guys if you see this please help me
A girl throws a pebble into a deep well at 4.0 m/s (downward). It hits the
water in 2.0 s.
a. How far below the ground is the water's surface?
b. What is the pebble's average velocity?
2.0 A are flowing through an electric motor. How long will it take for 40 Coulombs to flow through the motor?
Answer:
Answer: Magnitude = [____]; unit = [____].
Explanation:
Heat moves from hot to cold either through air or liquid
Answer:
both
Explanation:
because when it is hot in summer 5hat is the air and the sund u can warm things up and then it get hot
explain why wind and wave power could not be relied on to provide a country's entire electricity supply .
Answer:
because if the plant that produced that type of energy broke down you would need another type of energy to replace it.
Explanation:
Reflection is when waves bounce back and Rarefactions are when waves change speed in a new medium.
true or false
Answer:
False
Explanation:
If I am not mistaken reflection is when light bounces off of a surface such as snow,water,glass ect. and refraction is when,the fact or phenomenon of light, radio waves, etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density?
A man weighing 490 N on earth weighs only 81.7 N on the moon. His mass on the moon is ____ kg. (Use g=9.8 m/s²)
Answer:
mass= 50kg
since the mass is constant everywhere
Is acceleration occurring in this statement?
A car moves at a constant speed and makes a left turn.
Answer:
no because the car is in the rest so this not a acceleration
Did you mention the correct independent variable – the substance’s properties (such as solubility, conductivity, and state of matter)?
yes
no
somewhat
Did you mention the correct dependent variable – the type of bond, ionic or covalent?
yes
no
somewhat
Answer:
1. Somewhat 2.Yes
Explanation:
Answer:
C,a
Explanation:
Water boils at 100°C and turns into steam. Which similarities or differences are there between water in these two states? (1 point)
The particles will have more space between them and will be moving at higher speeds as steam.
The particles will have more space between them as steam, but they will be moving at the same speed in both states.
The particles will have more space between them as a liquid, but they will be moving at the same speed in both states.
The particles will have more space between them as a liquid, but they will be moving faster as steam.
Answer:
My answer was A not sure if its correct as i am still doing the rest of the questions.
Explanation:
The particles will have more space between them and will be moving at higher speeds as steam compare to water.
What is latent heat ?The quantity of heat (in joules or calories) per mole or unit mass of the substance undergoing a change in state is the typical way to represent latent heat.
The latent heat involved in melting solids or freezing liquids is referred to as the "heat of fusion," while the latent heat involved in vaporizing solids or liquids or condensing vapor is referred to as the "heat of vaporization."
When water boils at 100°C and turns into steam, water vaporizes into steam by absorbing heat of vaporization. This heat energy remains in the steam as kinetic energy and makes their movement fast.
So, The molecules will have more space between them and will be moving at higher speeds as steam compare to water.
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What is the main difference between protons and neutrons
A protons have a much smaller mass than neutrons
B protons have a much larger value than neutrons
C protons have an electrical charge but neutrons have no charge
D protons make up the nucleus but neutrons orbit around the nucleus
Answer:
C: Protons have an electrical carge but neutrons have no charge.
Explanation:
Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged.
The picture shows an aerialist walking on a tightrope and holding a balancing bar.
An action-reaction pair of forces exists between-
A. the aerialist's arms and legs
B. the rope and the balancing bar
C. the aerialist's feet and the rope
D. the aerialist's body and shoes.
An action reaction pair of forces exists between : ( A ) The aerialist arms and legs
Action-reaction pair of forcesAction-reaction pair of force comprises of the force that acts on the object as a action force and the force experiened by the object due to newton third law of motion as the reaction force. Therefore in the diagram an action reaction pair of forces can be experienced between the aerialist arms and legs
Hence we can conclude that An action reaction pair of forces exists between : ( A ) The aerialist arms and legs.
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Motion happens whenever
Answer:
one object exerts a force on a second object
Explanation:
i just took this
Difference between lens formula and mirror firmula?
A 21.2-kg object is being pulled in one direction by a force of 68.8 N while a force of 26.5 N pulls in the opposite direction. What is the acceleration of the object
The net force is in the direction of the larger force. If we take that direction to be positive, then the net force has a magnitude of
68.8 N - 26.5 N = 42.3 N
Use Newton's second law to solve for the acceleration:
F = m a
42.3 N = (21.2 kg) a
a = (42.3 N) / (21.2 kg)
a ≈ 2.00 m/s²
(you might also try 1.99 or 2.01 in case that doesn't get accepted)
Ummmm ya girl needs help
hydrogen: 4
nitrogen: 4
oxygen: 12
this should be correct
What are the different forms of treatments available for somatoform disorders?
Answer:
Treatment options include medications, particularly tricyclic antidepressants and SSRIs,21,22 and psychotherapy. Nonpharmacologic treatment strategies (e.g., massage, acupuncture) may also be beneficial. patients initially presented with symptomatic pain due to a shoulder injury.
Somatoform disorders can be treated by psychotherapy and through medications.
What are somatoform disorders?Somatoform disorders are a group of psychiatric disorders whereby patients have a wide variety of clinically significant but unexplained physical symptoms.
The treatment options for somatoform disorders include:
PsychotherapyMedications Yoga and meditationAcupunctureTherefore, somatoform disorders can be treated by psychotherapy and through medications.
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1) if you could eliminate one item from your diet to improve your heath, what would it be?
2) if you could add one item to your diet to improve your heath, what would it be?
Answer:
Rice
Explanation:
Because I can't control eating lots of rice
Answer:
1. I would eliminate chocolate. I normally eat healthy but when chocolate's around, I can't resist it though, it has a naturally bad affect on my health. Chocolate makes me nauseas but I still eat it because the taste is unbearable.
2. I would add fish. I hear that it's a good protein, and I don't eat chicken or meat or fish at all because of the texture, vegan or vegetarian? Eh, no. But, I would add fish because many people say it has great health benefits.
Once a person passes the age of 65, he or she should stop exercising.
Please select the best answer from the choices provided.
ОТ
OF
Answer: False
People age 65 and older still need exercise. Although the intensity of each workout won't be as high compared to younger ages. Everyone needs exercise to keep their heart healthy, to lower the bad cholesterol, etc.
Answer:
no
Explanation:
very false
PLEASE HELP. I'LL GIVE BRAINLIEST TO CORRECT ANSWER.
There are several ways to model a compound. One type of model is shown.
4 C's are connected in a line by 3 black lines. The C on the left has 3 H's attached to it each by a black line. The next C has 1 H attached by a black line and 1 O attached by 2 black lines. The next C has 2 H's attached to it by 1 black line each. The last C has 2 H's attached to it by 1 black line each and 1 O attached by a single black line. That O has an H attached to it by 1 black line.
What is the chemical formula for the molecule represented by the model?
CHO
C4H9O2
C4H8O
C3H8O2
Answer:
C
Explanation:
Edge2020
Define potential difference in a uniform electric field?
Explanation:
For example, a uniform electric field E is produced by placing a potential difference (or voltage) ΔV across two parallel metal plates, labeled A and B. ... The relationship between ΔV and E is revealed by calculating the work done by the force in moving a charge from point A to point B.