1) Newton first law of motion: state“If a body is at rest it reamain at rest and if it is in a motion it continu its motion unless a net external force acting on it”
This law also called law of inertia
2) Newton second law of motion: states that ‟acceleration to the force acting on the body and inversky proportional to the mass of the body”
3) Newton's third law of motion: It is not possible to exert a force abody with out the body exerting a forces in the opposite direction.
These forces are called action and reaction forces
hope it's helpful ❤❤❤❤❤❤
THANK YOU.
a ball of mass 1kg is being suspended 10m above the ground & is then dropped. what is the balls kinetic energy just before it hits that ground ?
a. 10 J
b. 98 J
c. 50 J
d. 0 J
Answer:
E = 98 J
Explanation:
Given that,
The mass of a ball, m = 1 kg
It is being suspended 10m above the ground & is then dropped.
We need to find the ball's kinetic energy just before it hits that ground. The conservation of energy holds here. It means, the kinetic energy just before it hits that ground is equal to its potential energy i.e.
[tex]E=mgh\\\\E=1\times 10\times 9.8\\\\E=98\ J[/tex]
so, the required energy is 98 J. Hence, the correct option is (b) "98 J".
A delivery truck driver’s round trip route from the warehouse takes her 3 km East, then 1 k North, then 3 km West, and finally 1 km South. Which of the following statements cannot be true?
a. The displacement of the trip is zero
b. The distance of the round trip is 8 km
c. After driving 3 km East, the magnitude of displacement and distance are equal
d. The total displacement and distance are the same after the trip
Answer:
D I think hope this helps you
What type of system would allow light to enter and exit, but would keep any
additional atoms out?
Answer: it’s closed
Explanation: a pex
When two things are the same temperature:
А
Heat transfer between the two things stops
B
Their molecules stop moving
They have the same number of molecules
D
Their molecules move at the same average speed
Answer:
When two objects are in thermal equilibrium they are said to have the same temperature. During the process of reaching thermal equilibrium, heat, which is a form of energy, is transferred between the objects.
For any object in motion, distance is always _________ displacement
Answer:
for any object in motion , distance is always greater than displacement
For any object in motion, distance is always greater or equal to the displacement but it can never be less than the displacement because displacement is the shortest distance measured between the initial and the final position.
What is displacement?An object's position changes if it moves in relation to a reference frame, such as when a passenger moves to the back of an airplane or a professor moves to the right in relation to a whiteboard.
Displacement describes this shift in location.
Distance is always higher or equal to displacement for any item in motion, but it can never be less because displacement is the shortest distance between the beginning and end positions.
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If you had a accident and could no longer speak what part of your brain might of been damaged?
Answer:
Thus, damage to the right side of the brain may cause movement problems or weakness on the body's left side. For most people, the left half of the brain is responsible for verbal and logical functions including language (listening, reading, speaking, and writing), thought and memory involving words.Explanation:
Carry on learning
Brainliest and a bunch of points- plz help! Also add explanation
Answer:
i believe it's the first one
Explanation:
i'm not entirely sure but i hope this helps :) have a nice day !!
A 5kg box rests on a table. a 3 kg box rests on top of the 5 kg box. what is the normal force from the table?
a. 19.6 n
b. 29.4 n
c. 49 n
d. 78.4 n
==> The total mass resting on the table is (5 kg + 3 kg) = 8 kg.
==> The total weight of that mass is (8 kg) x (9.8 m/s) = 78.4 newtons
==> The boxes are stacked. So the table doesn't know if the weight on it is coming from one box, 2 boxes, 3 boxes, or 100 boxes in a stack. The table only knows that there is a downward force of 78.4 newtons on it.
==> The table stands in a Physics classroom, and it soaks up everything it hears there. It knows that every action produces an equal and opposite reaction, and that forces always occur in pairs.
Ever since the day it was only a pile of lumber out behind the hardware store in the rain, the table has known that in order to maintain the good reputation of tables all over the world, it must resist the weight of anything placed upon it with an identical upward force. This is the normal thing for all good tables to do, up to the ultimate structural limit of their materials and construction, and it is known as the "normal force".
So the table in your question provides a normal force of 78.4 newtons. (d)
All changes
5. What is the major difference between the Bohr model and the currently accepted atomic
model?
O Bohr assumed that electrons could be found within an electron cloud.
O Bohr assumed that electrons move in fixed orbits.
Bohr assumed that the nucleus was positive.
Bohr assumed that electrons have very little mass.
A 3.9 kg crate is accelerated from 7.0 m/s to 9.5 m/s. What is the amount of work needed to accelerate the crate to the nearest tenth of a joule?
tony walks at an average speed of 70 m/min from his home to his school.If the distance between his home and the school is 2100 , how much time does it take for tony to walk to school
It takes 30 minutes for Tony to get to school.
2100 divided by 70 is 30, which would represent the amount of minutes.
Also he is walking very fast to be getting 70 in a minute.
Hope this helps and have a nice day.
-R3TR0 Z3R0
two students stand 4.0 meters apart and shake a jump rope, creating a standing wave with 5 antidotes. what is the wavelength of the standing wave?
1.6m
0.8m
4.0m
5.0m
Answer:
i think it is 5.0 m but im not sure sorry if im wrong
im in 7th grade
Explanation:
A see-saw is balanced on a pivot with two children on it. One child is sitting 1.5 m to the left of the pivot and has a mass of 50 kg. Another
child of mass 30 kg is sitting on the right hand side of the pivot. What distance away from the pivot is the child on the right of the pivot?
a) 30 cm
b) 1.5 m
c) 2.5 m
d) Impossible to say without knowing the length of the see-saw
If an object is not turning, the total clockwise moment, compared to the total anti-clockwise moment about any pivot, must be what?
a) Clockwise moment is twice as large as anti-clockwise moment
b) Clockwise moment is three times as large as anti-clockwise moment
c) Clockwise moment is half as large as anti-clockwise moment
d) Clockwise moment is exactly equal in magnitude to the anti-clockwise
moment
Answer:
Explanation:
Remark
This is a second class lever. It is much more efficient than the fishing pole problem. All distances are measured from the pivot in these kinds of questions.
Givens
d1 = 1.5
d2 = ?
m1 = 50 kg
m2 = 30 kg
The lighter child will have to sit further away from the pivot to make the two conditions equal.
Formula
d1*m1 = d2*m2
1.5*50 = d2 * 30
75 = 30 * d2
75/30 = d2
d2 = 2.5
Remark
Notice that the distance is longer for the lighter child. The fact that these are masses and not forces does not matter, but you should take note of it. There is a difference between masses and forces. See the fishing pole problem.
Answer to the multiple Choice question. No motion on this kind of problem means equal moments. The answer is D
Problem 2
1) The wheels are further apart making B more stable. The wider the distance the wheels are apart, the harder it would be to tip the concrete mixer over
2) The center of gravity is lower. The higher the force is the more chance you have of exerting an external force to tip the mixer over.
According to Mendel's law of segregation, what takes place during meiosis?A.Pairs of alleles cross over on chromosomes, exchanging one for anotherb.Pairs of alleles separate in meiosis, and each gamete receives one allele of a pairc.Part of an allele is separated, or broken off, from its chromosomed.One chromosome is suppressed, and the other chromosome of the pair determines the traits of the offspring
Answer:
b. Pairs of alleles separate in meiosis, and each gamete receives one allele of a pair.
Explanation:
Gregor Mendel, who is referred to as the FATHER OF GENETICS because of his contribution to the principles of inheritance, proposed in one of his laws called LAW OF SEGREGATION that the alleles of a gene will separate into gametes in such a way that only one of the two alleles that make up a gene will be in each gamete.
This division/separation of alleles during gamete formation is called MEIOSIS. Note that, allele is one member of a gene. Hence, according to Mendel, in meiosis, pairs of alleles separate and each gamete receives one allele of a pair.
Describe how sound signals can be transmitted from a radio station and received on a radio at your home. Create a labeled diagram that shows this process
Answer:
The person above is right.
Explanation:
You just need to type in sound signals transmitted from a radio station and received on a radio at your home to find a diagram https://flypaper.soundfly.com/wp-content/uploads/2019/03/am.gif
TRUE or FALSE: Feeling "weightless" can be the result of accelerating downwards towards Earth.
A. TRUE
B. FALSE
Newton's Second Law says that the force applied to an object is equal to the mass of the object times its acceleration. In other words, F=ma. Use a rearranged version, a=F/m in order to calculate the acceleration of a 5 kg skateboard when you give it a push of 20 N. PLEASE HELP FAST!!
Here the force is 20 N and mass is 5 kg
acc= Force/mass
acc=20/5= 4m/s²
Grade 6-7
1. A diver who climbs up to the 30 meter high dive
board gains 12000J of GPE. What is her mass?
2. A football kicked 11.5 meters in the air gains
63.25J of GPE. What is the mass of the football?
3. Explain, using calculations, why a pole vaulter
who competes on another planet wouldn't have
the same GPE as on Earth.
Answer:
1. m = 40 kg
2. m = 0.55 kg
3. Because of the different values of acceleration due to gravity, g, on the planet and the earth.
Explanation:
1. GPE = 12000 J
h = 30 meters
g = 10 m/[tex]s^{2}[/tex]
But,
GPE = mgh
where: m is the mass, g is the acceleration due to gravity, and h is the height.
12000 = m x 10 x 30
12000 = 300 m
m = [tex]\frac{12000}{300}[/tex]
= 40 kg
The mass of the diver is 40 kg.
2. GPE = 63.25 J
h = 11.5 meters
g = 10 m/[tex]s^{2}[/tex]
GPE = mgh
63.25 = m x 10 x 11.5
63.25 = 115 m
m = [tex]\frac{63.25}{115}[/tex]
= 0.55 kg
The mass of the ball is 0.55 kg.
3. The pole vaulter's GPE on the earth would not be the same as that on another planet due to the variation in the value of the acceleration due to gravity on the two planets, even if he cover the same height.
Given that: m = 60 kg, h = 25 m, determine the GPE on the earth that has g = 10 m/[tex]s^{2}[/tex], and another planet with g = 6.5 m/
Thus, on the earth;
GPE = mgh
= 60 x 10 x 25
= 15000
GPE = 15000 J
On the planet;
GPE = mgh
= 60 x 6.5 x 25
= 9750
GPE = 9750 J
The specific heat capacity of copper is 390 J/Kg AC. What does this
mean?
Answer:
It means that 400 J of heat is the required amount to raise or lower thh temperature of a 1kg piece of copper
Explanation:
390 J/Kg °C specific heat capacity of copper means, 390 J of energy is required to raise the temperature of 1 kg of copper by 1 °C
From the given information,
The specific heat capacity of copper is 390 J/Kg °C. To determine what this means, we will define the term specific heat capacity.
The specific heat capacity of a substance is the amount of energy required to raise the temperature of 1 kg of the substance by 1 °C.
Therefore, 390 J/Kg °C specific heat capacity of copper means, 390 J of energy is required to raise the temperature of 1 kg of copper by 1 °C.
Hence, 390 J/Kg °C specific heat capacity of copper means, 390 J of energy is required to raise the temperature of 1 kg of copper by 1 °C.
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What is the momentum of a 1, 500 kg car traveling at 3m/s?
67,500 kgm/s
67.5 kgm/s
4.5 kgm/s
4,500 kgm/s
========================================
Work Shown:
To find the momentum, we multiply the mass and the velocity.
m = mass = 1500 kg
v = velocity = 3 m/s
p = momentum
p = m*v
p = (1500 kg)*(3 m/s)
p = (1500*3) kg m/s
p = 4500 kg m/s
The momentum of an object is the product of its mass and velocity. Thus momentum of the car with 1500 kg and velocity of 3 m/s is 4500 kg m/s.
What is momentum?Momentum is a physical quantity that measure the ability to keep the force which make an object moves faster. Momentum like force is a vector quantity and is characterized with magnitude and direction.
Momentum is the product of velocity and its mass. Hence as the mass or velocity increases, momentum also increases. Increase in momentum makes the object moves faster.
Given mass of car = 1500 Kg
velocity = 3 m/s
momentum = velocity × mass
= 1500 Kg × 3 m/s
= 4500 Kg m/s.
Therefore, the momentum of the car is 4500 kg m/s.
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What is power?
1. Power is the distance an object is moved.
2. Power is the speed that an object is moved at.
3. Power is the amount of work done in a certain period of time.
4. Power is the distance an object is moved and how quickly it is moved.
Answer:
3
Explanation:
Im not that sure but I think its close... [srr]
Answer:
3. Power is the amount of work done in a certain period of time.
Explanation:
Engineers at the Space Centre must determine the net force needed for a rockets engine to achieve an acceleration of 70 m/s2. Assume the rocket is in outer space with no gravitational or other forces acting on it. If the mass of the rocket is 45 000 kg, what force is required to be produced by the rocket engines?
Answer:
3,150,000N
Explanation:
According to Newton's second law;
F = mass * acceleration
Given
Mass = 45000kg
acceleration = 70m/s^2
Substitute
F = 45000 * 70
F = 3,150,000N
Hence the force required to be produced by the rocket engines is 3,150,000N
Answer:
3,150,000 Newtons
Explanation:
F=M*A
F=45,000kg times (*) 70 m/s squared
F=3,150,000N (newtons)
What kind of injuries may affect a person's stability?
plz help me
Explanation:
a brain injury, a concussion, spinal cord injury, and a repetitive strain injury
Find the acceleration of an object when the force is 850 N and the mass is 85 kg.
A. 0 m/s2
B. 7.3 x 104 m/s2
C. 0.1 m/s2
D.10 m/s2
The can-chiller decreases the temperature of the liquid in the can by 15 °C.
The mass of liquid is 0.33 kg.
The specific heat capacity of the liquid is 4200 J / kg °C.
Calculate the energy transferred from the liquid as it cools.
Answer:
Energy transferred, Q = 20790 J
Explanation:
Given that,
The change in temperature of the liquid, [tex]\Delta T = 15^{\circ} C[/tex]
The mass of liquid, m = 0.33 kg
The specific heat capacity of the liquid is 4200 J/kg°C.
We need to find the energy transferred from the liquid as it cools. The energy transferred is given by :
[tex]Q=mc\Delta T\\\\Q=0.33\times 4200 \times 15\\\\Q=20790\ J[/tex]
So, 20790 J of energy is transferred from the liquid as it cools.
help me please Am I correct???
Answer:
They both experienced the same force as they weigh the same amount
Newtonian physics
Explanation:
What is the name of this muscle?
Answer:
shoulder
it is at the shoulder region
Explanation:
shoulder
What causes one plate to sink under another
1 Mass
2 Shape
3 Density
What moon phase will occur next in the lunar cycle?
Answer: gibbous moon
Explanation:
weehoo giggy sliggy
Answer:
waxing crescent
Explanation:
True or False: There is the same amount of water on earth today as there was when earth was formed.
Answer:
Yes the water amounts are the same.
Explanation: