Answer:
its B
Explanation:
It's B & A at the same time because A. a roller coaster uses brakes to slow down and stop. B is the most reasonable answer. Because all roller coasters go up and over a second time over the hill, but they also slow down. But go with B.
TELL ME IF I´M RITE
11 12 13 14 15 16 17 18 19 20
TIME REMAINING
01:40:56
Who described atoms as small spheres that could not be divided into anything smaller?
Bohr
Dalton
Rutherford
Thomson
Answer:
jhon Dalton described it
Explanation:
hope it works out for you
if please mark brainiest
John Dalton described atoms as small spheres that could not be divided into anything smaller.
Who was John Dalton?John Dalton is the scientist who described atoms as small spheres that could not be divided into anything smaller. He proposed his atomic theory in 1803, which included the postulate that all matter is composed of tiny, indivisible particles called atoms. D
Dalton's theory also stated that atoms of different elements are unique in their mass and chemical properties and combine in simple whole-number ratios to form compounds. Dalton's model of the atom was a solid, indivisible sphere that was the smallest possible unit of an element.
While this model has been refined and updated with new discoveries, Dalton's contributions laid the foundation for the modern understanding of atomic structure and chemical reactions.
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what is the difference between reproducibility and repeatability
Answer:
Repeatability is how much variability in the measurement system is caused by the measurement device. Reproducibility is how much variability in the measurement system is caused by differences between operators.
Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. Each step is of uniform height . The mass of each object is a multiple of the base mass : object 1 has mass 3.10 , object 2 has mass 1.46 , and object 3 has mass . When the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. If the objects are then relocated as shown, what is the new total potential energy of the system? Each answer requires the numerical coefficient to an algebraic expression. Each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. Enter only the numerical coefficient. (Example: If the answer is 1.23 ,
The definition of gravitational potential energy would gravitate allows to find the answers for the energy of each object on the highest rung of the ladder are:
a) expression for gravitational potential energy is [tex]U_p = m g \ \Delta y[/tex]
b) Energy value
* Body 1 U_p = 82 J
* Body 2 U_p = 38.6 J
* Body 3 18.5 J
The gravitational potential energy is a configuration energy that represents the amount of work that the system can do for a given configuration, its expression is
[tex]U_p = m g \ \Delta y[/tex]
Where [tex]U_p[/tex] is the gravitational potential energy, m the mass of the body and Δy the difference in height.
In this case it indicates that the minimum height is at the bottom and is equal to zero, the steps of a ladder have a height of approximately y = 15 cm = 0.15 m
They indicate the mass of the bodies are m₁ = 3.10 kg, the mass of the body 2 m₂ = 1.46 kg , the mass of the third object is not observed, suppose it is m₃ = 0.7 kg.
They indicate that the body is placed on the last step, suppose it is a standard 18-step ladder, therefore the total height is
y = # _ steps y_each step
y = 18 0.15
y = 2.70 m
the gravitational potential energy to the capacity of the body is
body 1
[tex]U_p[/tex] = m₁ g Δy₁
U_p = 3.10 9.8 (2.70 -0)
U_p = 82 J
body 2
U_p = 1.46 9.8 ( 2.7-0)
U_p = 38.6 J
body 3
U_pUp = 0.70 9.8 (2.7-0)
U_p = 18.5 J
In conclusion, using the definition of gravitational potential energy, we can find the answers for the energy of each object on the highest rung of the ladder are;
a) expression for gravitational potential energy is [tex]U_p = m g \ \Delta y[/tex]
b) Energy value
* Body 1 U_p = 82.0 J
* Body 2 U_p = 38.6 J
* Body 3 U_p = 18.5 J
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The brakes are slammed on a speeding truck and it skids to a stop. If the truck were heavily loaded so it had twice the total mass, the skidding distance would be...
A) the same
B) one and one-half times as far
C) twice as far
D) four times as far
Explain your answer
Answer:
twice more but I have to make it 20 characters so h8 how u doing I hear yelling outside my room and exstasional dread in my head
If the mass of the truck is doubled, the force of friction is doubled, and the skidding distance is doubled.
Hence, the correct option is C.
The skidding distance is proportional to the mass of the truck. If the truck is heavily loaded so it has twice the total mass, the skidding distance will be twice as far.
This is because the force of friction is proportional to the normal force, which is in turn proportional to the mass of the truck. The greater the mass of the truck, the greater the force of friction, and the longer the skidding distance.
In equation form, the skidding distance is given by:
s = μ * d / f
where:
s is the skidding distance
μ is the coefficient of friction
d is the distance traveled before the truck stops
f is the force of friction
The force of friction is given by:
f = μ * mg
where:
m is the mass of the truck
g is the acceleration due to gravity
Therefore, If the mass of the truck is doubled, the force of friction is doubled, and the skidding distance is doubled.
Hence, the correct option is C.
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An unknown element shiny in color, malleable, conducts electricity, and is in group 2 on the periodic table is a non-metal.
True
False
what is the meaning of vitality
What is the volume of a metal that has a density of 6.2g/cm3 and a mass of 13.8 grams?
Answer:
the answer would be 2.23
Explanation:
that is also a rounded up decimal! to find your answer, divide the mass (13.8) by the density (6.2) to find your volume :)
3. The brakes of a certain car can produce an acceleration of 6 m/s.
a. How long does it take the car to come to a stop from a velocity of 30 m/s?
Answer:
5s
Explanation:
initial distance: 0 m
distance: ? (we don't know)
initial velocity: 0 m/s
velocity: 30 m/s
acceleration: 6 [tex]m/s^{2}[/tex]
time: ? (we are looking for)
v = v0 + at
plug the numbers in:
30 = 0 + 6(t)
= 30 = 6t
= t = 5
5s
if an inelastic collision takes place, during the collision, what is conserved?
Answer:
An inelastic collision is a collision in which there is a loss of kinetic energy. While momentum of the system is conserved in an inelastic collision, kinetic energy is not.
Explanation:
If you were able to cut this bar
of gold over and over until
you have the smallest particle
of gold possible, what would
that particle be?
А
a molecule of gold
B
an atom of gold
Answer:
if you cut a bar of gold over and over it would result to an atom.
because an atom is the smallest particle of an element that can exist.
I hope this helps
Calculate the velocity of a car traveling 0.75ters in 2.5 seconds using
meters/second (m/s)
Answer:
Distance covered:0.75
Time take:2.5
Velocity = distance/time
V=0.75/2.5
V= 0.3m/s
Hope this helpes
in the gravitational field strength formula, g=Gm/r^2, whats the formula for finding m?
Answer:
Explanation:
just isolate the m
m= g.r²/G
What can we say when one force
is greater than another force?
A. There is no net force.
B. There is no change in motion.
C. There is a change in motion.
D. The forces are in equilibrium.
When one force is greater than another force, we can say that there is a change in motion. The correct answer is option C: "There is a change in motion."
According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. When one force is greater than another force, the net force acting on the object is not zero. If the net force acting on an object is not zero, it will cause the object to accelerate in the direction of the larger force. This acceleration leads to a change in motion. The object may speed up, slow down, change direction, or a combination of these.
Option A, "There is no net force," is incorrect because if one force is greater than another, there is a net force acting on the object.
Option B, "There is no change in motion," is incorrect because, as explained above, a greater force leads to a change in motion.
Option D, "The forces are in equilibrium," is incorrect because if one force is greater than another, the forces are not balanced, and the object is not in equilibrium.
Therefore, the correct statement is that there is a change in motion when one force is greater than another force.
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if a velocity time graph is hortizontal then velocity is
Answer: If a velocity time graph is horizontal then the velocity is constant and there is no acceleration.
A car travels 500 miles east in 10 hours. What is the velocity of the car?
Show Your Work.
Do Not Forget Your Correct Units.
Answer:
50m/s
Explanation:
500/10 to find the velocity always divide
the distance bt the time
Oh a sqiurrel’s hidden nuts, for every 5 that get found, there are 3 that to not get found. A squirrel hid 40 nuts all together. How many of the nuts do not get found?
Answer:
66 2/3
Explanation:
15. What is velocity, and how is it useful for describing an object's motion?
Velocity describes motion by indicating how fastan object moves and in what direction. Speed is a magnitude of velocity, which indicates only how fast an object moves. Speed shows how much distance is traversed in a given interval of time: In a general case of motion,.
The table describes the properties of four compounds.
Which compounds are most likely ionic?
compounds A and B
compounds B and C
compounds C and D
compounds D and A
The characteristics of the ionic bonds allows to find the results for the question about which compound are ionic is:
d) Compounds D and A.
Chemical compounds are formed by atoms linked by electrostatic forces, where one of the elements gave up some electrons and the other element acquired these electrons, the two atoms being in an ionic state, consequently the bond is strong and has several characteristics:
High melting point. It dissolves in polar solvent (water). In general they are hard and brittle solids (NaCl). In solution they are conductors of electricity.
In these characteristics, let's analyze the compounds in the table.
With the property of high melting point the compounds A and D can be ionic. According to the dissolution property all could be ionic. According to the conduction property of electricity, compounds A and D can be ionic
Let's review the different alternatives:
a) False. Compound A and B has a low melting point.
b) False. The B and C compounds have low melting points.
c) False. Compound C has a low melting point.
d) True. The two compounds meet all the characteristics of ionic compounds.
In conclusion with the characteristics of the ionic bonds we can find the results for the question about which compound are ionic is:
d) Compounds D and A are ionics.
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A girl standing 600m away from a cliff bangs two pieces of wood together and hears an echo 3.5 seconds later. Determine the speed of sound in that place
Speed = 342.86 m/s
EXPLANATION
s = v × t/2
600 m = v × 3.5 s/2
600 m × 2 = v × 3.5 s
1200 m = v × 3.5 s
v = 1200 m/3.5 s
v = 342.86 m/s
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The speed of sound in that place 342.86 m/s
What is speed of sound?
The speed of sound is defined as the distance through which a sound wave’s point, such as a compression or a rarefaction, travels per unit of time.
given
distance of cliff= 600 m
time = 3.5 seconds
speed of sound = ?
distance = speed * time
distance travelled by the sound to come back to the place where the girl was standing will be = 600 * 2 m
speed = distance / time
speed = 600 * 2 m / 3.5 seconds
speed = 1200 / 3.5 = 342.86 m/s
The speed of sound in that place 342.86 m/s
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What is the relationship between the distance from the Sun and the orbital period?
P^3=a^2
P^2=Gm
P^2=a^3
T^2=P^3
Answer:
Kepler's third law - shows the relationship between the period of an objects orbit and the average distance that it is from the thing it orbits. This can be used (in its general form) for anything naturally orbiting around any other thing.
Formula: P2=ka3 where:
P = period of the orbit, measured in units of time
a = average distance of the object, measured in units of distance
k = constant, which has various values depending upon what the situation is, who P and a are measured.
This is the general form of the formula, so obviously you need at least two of the quantities to find the third. "k" is the trickiest thing since it depends upon the objects that are involved and how you measure "P" and "a". Since "P" can be measured in any unit of time (seconds, days, years, etc), and "a" can be measured in any unit of distance (meters, km, AU), the value of "k" can be quite diverse from one system to another.
There is a simplified version of this law: P2 = a3 where:
The object must be orbiting the Sun
P = period of the orbit in years
a = average distance of the object from the Sun in AU
This version is much more simple, since it has "k" = 1, so it is ignored when those units of measure are used.
Which of the following statements about using knives is FALSE?
Carry knives point down.
When cutting, the knife blade should be parallel to your nails on your guiding hand.
When cutting, lay thumb and forefinger flat on the food your are cutting to hold it firmly in place.
Always cut away from the body.
Answer:
When cutting, lay the thumb and forefinger flat on the food you are cutting to hold it firmly in position
Explanation:
Because it may cut you so avoid it
what precautions should you take when working with electronic equipment?
Answer:
Be sure to unplug the power source of all electrical equipment before working on it. Always pull from the plug, not the cord. Always wear proper non conductive clothing – insulated gloves, non conductive protective apparel and shoes with insulated soles. Avoid loose clothing or ties.
A car drives 215 km west and then 85 km south. Find the distance and displacement of the car.
Answer:
Distance= 300 km
Displacement= 130
Explanation:
When you find distance you have to add
When you find displacemnet you subtract
If a car drives 215 kilometers west and then 85 kilometers south, then the distance and displacement of the car would be 300 kilometers and kilometers respectively.
What is displacement?Displacement is a vector quantity. This indicates that it has both a direction and a magnitude and that it is visually represented as an arrow that points from the starting position to the ending position.
As given in the problem, if a car drives 215 kilometers west and then 85 kilometers south, then we have to find the distance and displacement of the car,
The distance traveled by car = 215 kilometers + 85 kilometers
= 300 kilometers
The displacement covered by the car = √(215² + 85²)
= 231.2 Kilometers
Thus, the distance traveled by car would be 300 Kilometers and the displacement would be 231.2 Kilometers in the southwest direction.
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NEED HELP!!! 13 POINTS!!!!!!
According to Newton’s first law of physics, which explains what happens to a baseball when it is hit with a bat?
OPTIONS:
A.
The course of the ball cannot be changed as long as it remains in motion.
B.
The ball lacks force or momentum but gets momentum when it hits an unbalanced force.
C.
The ball is an unbalanced force and can only have its course altered by a stationary object.
D.
The ball is traveling at a steady speed until it hits an unbalanced force and changes direction.
PLEASE NO LINKS
Answer:
Your answer will be D.
The ball is traveling at a steady speed until it hits an unbalanced force and changes direction.
Explanation:
The ball is traveling at a steady speed until it hits an unbalanced force and changes direction. The correct option is D.
Thus, An unbalanced external force acts upon an item, Newton's first law of motion, often known as the law of inertia, asserts that an object at rest will remain at rest and an object in motion will continue to move in the same direction and at the same pace.
When a baseball is struck with a bat, it is originally at rest or moving steadily forward.
The ball experiences an imbalanced force when it is struck by the bat, altering its direction and speed. The bat's application of external force is what causes this shift in motion.
Thus, The ball is traveling at a steady speed until it hits an unbalanced force and changes direction. The correct option is D.
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If the distance around a circular track is 2.0km and if runners run 3 laps, what is the distance travelled?
a) 2 km
b) 0km
c) 3 km
d) 6 km
Answer:
d=6km
Explanation:
because multiply 2x3 is six
In the district soccer championship finals, Elizabeth kicks a 6 N soccer ball with a force of 80.0 N to the right.
There is friction between the ball and the ground (mu=0.20) as well as 23 N of air resistance.
(i) Draw the FBD for the ball; include both types of forces and magnitudes.
(ii) What is the net force acting on the ball? Show work
(iii) What is the acceleration of the ball? Show work
1. Define weight
2. How is the weight of an object related to its mass?
3. If an object has a mass of 50 kg, what is its weight?
Answer:
weight is the product of mass andgravitational acceleration expressed in newtons.w=mgw=mg ....w=50kg X 9.8m/s...w=490Nto digitize sound, a process called _____ is used to measure the amplitude of a sound wave thousands of times per second.
Answer: Sound recording and production
Explanation: Digital audio is also the name for the entire technology of sound recording and reproduction using audio signals that have been encoded in digital form.
guys help I'm doing a music test today
Chuyển đổng đều là gì
Answer:
Uniform motion is defined as the motion, wherein the velocity of the body travelling in a straight line remains the same.
Chuyển động đều là chuyển động mà vận tốc có độ lớn không thay đổi theo thời gian. Chuyển động không đều là chuyển động mà vận tốc có độ lớn thay đổi theo thời gian.