Answer:♂️
Explanation:
A roller coaster is traveling at 13 m/s when it approaches a hill that is 400 m long. Heading down the hill, it accelerates at 4.0 m/s2. What is the final velocity of the roller coaster?
Answer:
The value is [tex]v = 47 \ m/s[/tex]
Explanation:
From the question we are told that
The initial speed of the roller coaster is [tex]u = 13 \ m/s[/tex]
The length of the hill is [tex]l = 400 \ m[/tex]
The acceleration of the roller coaster is [tex]a=4.0 \ m/s^2[/tex]
Generally the acceleration is mathematically represented as
[tex]a = \frac{ v - u}{ t_f - t_i }[/tex]
Here [tex]t_i[/tex] is the initial time which is equal to zero
[tex]v_f[/tex] is the final velocity which is mathematically represented as
[tex]v_f = \frac{d}{ t_f}[/tex]
So
[tex]a = \frac{ \frac{d}{d_f} - u }{ t_f - t_i}[/tex]
[tex]4 = \frac{\frac{400}{ t_f} - 13}{t_f - 0}[/tex]
[tex]4 = \frac{400 - 13t_f}{ t_f} * \frac{1}{t_f}[/tex]
[tex]4t_f ^2 +13f + 400 =[/tex]
Solving this using quadratic formula we obtain
[tex]t_f = 8.5 \ s[/tex]
[tex]t_f = -11.8 \ s[/tex]
Generally time cannot be negative so
[tex]t_f = 8.5 \ s[/tex]
Generally the final velocity is mathematically represented as
[tex]v = \frac{400}{8.5}[/tex]
[tex]v = 47 \ m/s[/tex]
Answer:58 m/s
Explanation:
That’s what it says
Señale la veracidad (V) o falsedad (F) de las siguientes proposiciones: I. Una partícula está en equilibrio cuando se encuentra en reposo. II. Una partícula se encuentra en equilibrio, el observador no registra fuerza alguna sobre la partícula. III. Un cuerpo que se mueve con rapidez constante se encuentra en equilibrio. FFV VFF FFF VVF
Answer:
(i) V, (ii) F, (iii) F
Explanation:
Se comprueba la veracidad de cada proposición:
(i) Una partícula está en equilibrio cuando se encuentra en reposo.
Respuesta: Según la Primera Ley de Newton, toda partícula está en equilibrio si está en reposo o desplazándose a velocidad constante. Por ende, la proposición es verdadera.
(ii) Una partícula se encuentra en equilibrio, el observador no registra fuerza alguna sobre la partícula.
Respuesta: Según la Primera Ley de Newton, toda partícula está en equilibrio si está en reposo o desplazándose a velocidad constante.
Además, la Segunda Ley de Newton establece que la fuerza neta sobre la partícula como resultado de fuerzas externas es igual a cero. Lo cual quiere decir que una partícula puede estar en equilibrio y estar sometidas a fuerzas externas. En conclusión, la proposición es falsa.
(iii) Un cuerpo que se mueve con rapidez constante se encuentra en equilibrio.
Respuesta: Según la Primera Ley de Newton, toda partícula está en equilibrio si está en reposo o desplazándose a velocidad constante.
La rapidez es la magnitud de la velocidad, para que la velocidad sea constante debe ser constante tanto en magnitud como en dirección. La afirmación no garantiza que la dirección de la partícula sea constante. Por ende, la proposición es falsa.
To dazzle his students, Mr. Turner collected volumes of ammonia gas and carbon dioxide gas. As the two colorless gases were combined in a closed two-liter bottle with a small amount of ammonium hydroxide, the chemistry students watched in amazement at the growth of white crystals inside the bottle. What happened inside the bottle as the gases were mixed? A) a physical change B) a chemical change C) the solution process D) a mixture was formed
Answer:
B) a chemical change .
Explanation:
There will be no chemical reaction when the gases ammonia and carbon dioxide are mixed together . But when there is presence of ammonium hydroxide , chemical reaction takes place between carbon dioxide and ammonium hydroxide resulting into the formation of ammonium carbonate as follows
2NH₄OH + CO₂ =( NH₄)₂CO₃ + H₂O.
The growth of white crystals inside the bottle indicates the presence of ammonium carbonate .
So it is a chemical change .
Which of the following characteristics did John Dalton include in his description of the atom?
A. In any element, all the atoms are the same
B. Atoms only exist on Earth
C. Atoms are smaller than quirks
D. All matter is made up of atoms
E. Elements in a compound are always in constant action
Please just type the letters.
Answer:
The answer is "In any element ,all the atoms are the same".
PLEASE HELP ! What postulate would justify the following statement? If D is between A and B, then Segment AD plus segment DB equals segment AB.. A. Angle Addition Postulate B. Intersecting Lines Postulate C. Points Postulate D. Segment Addition Postulate
Answer:
D. Segment Addition Postulate
Explanation:
I got it correct on the quiz.
Mary is bouncing her basketball down the court and wants to find out how much mechanical energy she has. What is the formula that she should use?
Answer:
Mary is practicing kinetic energy so she can use 1/2mv^2.
Mary is bouncing her basketball down the court and wants to find out how much mechanical energy she has, then she has to use the formula
Mechanical energy = 1/2mv² + mgh
What is mechanical energy?Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total potential energy stored energy in the system which is represented by total potential energy.
As total mechanical energy is the sum of all the kinetic as well as potential energy stored in the system.
ME = KE + PE
As Mary is bouncing the basketball this means it would have some kinetic energy because of the movement along with the potential energy which is due to the height of the bouncing basketball
The total kinetic energy of the basketball
KE = 1/2mv²
Similarly, the total potential energy of the basketball
PE = mgh
Thus, when Mary is bouncing her basketball down the court and has to use the formula to calculate how much mechanical energy she has.
1/2mv² + mgh = mechanical energy.
Learn more about mechanical energy from here
brainly.com/question/12319302
#SPJ5
state position nature and size of an image when an object placed at an distance equal to its focal length of rear view in vehicles
Answer:
The position nature and size of an image when an object placed at a distance equal to its focal length of rear view mirrors in vehicle will be
1) Position: Behind the mirror
2) Nature: Virtual
3) Size: Smaller than the object
Explanation:
Due to the nature and use of rear view mirrors, which are meant to enable the front facing driver visualize a wide area of the back portion of the vehicle, such that the images of the object will always remain smaller than the object, require a convex image
The image size, location, nature and orientation of an object placed in front of a convex mirror is diminished, behind the mirror of the upright, virtual, and upright
Therefore, the position nature and size of an image when an object placed at a distance equal to its focal length of rear view mirrors in vehicle will be
Position: Behind the mirror
Nature: Virtual
Size: Smaller than the object.
A 2-column table with 4 rows. The first column titled mineral has entries diamond, cubic zirconia, common glass, ruby. The second column titled density and grams per cubic centimeter has entries 3.50 to 3.55, 5.50 to 5.90, 2.40 to 2.80, 3.90 to 4.10. If a rock sample has a mass of 1.17 g and a volume of 0.33 cm3, what type of rock is it? If a rock sample has a mass of 2.7 g and a volume of 1.1 cm3, what type of rock is it? If a rock sample has a mass of 11.2 g and a volume of 1.9 cm3, what type of rock is it?
Explanation:
1. diamond
2.common glass
3. cubic zirconia
Answer:
1.diamond
2. common glass
3. cubic zirconia
Explanation:
just did it!!
Draw a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5 resistor,
an 8 resistor, and a 12 resistor, and a plug key, ammeter, all connected in series.
here is your answer hope it helps
Answer:
scjematic diagram of a circuit
What is the formula for finding the perimeter of a space?
Answer:
What shape is it? the formula is different depending on the shaping
Explanation:
Square P=4s
Rectangle P=2L+2W
Triangle a+b+c
Circle P=C=2πr=πd
and so on
The "Tragedy of the Commons" describes the conflict between a. Developing and developed nations. b. Individuals and society. c. Farmers and industrialized society. d. Canada and Mexico.
Rain drops fall on a tile surface at a density of 4638 drops/ft2. There are 17 tiles/ft2. How many drops fall on each tile? Answer in units of drops/tile
Answer: 272.82 drop/tile
Explanation:
Given that the Rain drops fall on a tile surface at a density of 4638 drops/ft2. There are 17 tiles/ft2. How many drops fall on each tile?
Tiles/ft^2 × drop/tiles = drop/ft^2
Tiles will cancel out. Leaving the answer to be drop/ ft^2
Substitutes all the magnitude of the above units.
17 × drop/tiles = 4638
Make drop/tiles the subject of formula
Drop/tiles = 4638/17
Drop/tiles = 272.82
Therefore, 272.82 drop/tile drops fall on each tile?
A man dropped a dime in a wishing well, he heard it 10 sec later Find velocity on impact
Answer:
Vf = 98 m/s
Explanation:
The dime is in a free fall motion under the influence of gravity. For the final velocity of the dime, we use 1st equation of motion here:
Vf = Vi + gt
where,
Vf = Final Velocity = ?
Vi = Initial Velocity = 0 m/s (Since, the initially the dime was at rest)
g = acceleration due to gravity = 9.8 m/s²
t = time taken = 10 s
Therefore, using these values, we get:
Vf = 0 m/s + (9.8 m/s²)(10 s)
Vf = 98 m/s
A hiker is at the bottom of a canyon facing the canyon wall closest to her. She is 790.5 meters from the wall and the sound of her voice travels at 329.2 m/s at that location. How long after she shouts will she hear her echo? Round to two decimals. (Be careful to consider why echoes happen)
Answer:
4.80 seconds
Explanation:
The velocity of sound is obtained from;
V= 2d/t
Where;
V= velocity of sound = 329.2 ms-1
d= distance from the wall = 790.5 m
t= time = the unknown
t= 2d/V
t= 2 × 790.5/ 329.2
t= 4.80 seconds
Part 3: List your favorite and least favorite scientific disciplines (e.G., biology, astronomy, physics) below. Identify each discipline, provide a definition of each discipline, and then cite the resource you consulted for each definition. Favorite Scientific Discipline: Definition:
Answer:
See explanation
Explanation:
Favourite scientific discipline; Chemistry
Definition: Chemistry is the study of the composition, properties and uses of matter as well as the principles governing the changes that matter undergoes.
Source: New School Chemistry by Osei Yaw Ababio (2013)
Least Favourite Scientific Discipline: Botany
Definition: Botany is the study of plants, it includes the study of the structure and properties of plants, as well as the biochemical processes that go on in plants. It also involves the study of plant classification, plant diseases and interactions of plants with their environment.
Source: Encyclopedia Britiannica.
A ball is dropped off a roof. The ball falls for 4 seconds. Just before the ball hits the ground what is its velocity?
Show work
Answer:
The velocity is 39.24 m/s
Explanation:
The time of fall t = 4 seconds
The initial velocity u = 0 m/s (since the ball is dropped, meaning it starts from rest)
Final velocity v = ?
Using
v = u + gt
where g is the acceleration due to gravity = 9.81 m/s^2
substituting, we'll have
v = 0 + (9.81 x 4)
v = 39.24 m/s
An object of mass 2 kg starts from rest and is allowed to slide down a
frictionless incline so that its height changes by 20 m. How fast is the object moving at the bottom of the incline?
a. 10m/s
b. 20m/s
c. 30m/s
d. 40m/s
Answer: B
Explanation:
Given that an object of mass 2 kg starts from rest and is allowed to slide down a frictionless incline so that its height changes by 20 m.
The parameters given from the question are:
Mass M = 2kg
Height h = 20m
Let g = 9.8m/s^2
At the bottom of the incline plane, the object will experience maximum kinetic energy.
From conservative of energy, maximum K.K.E = maximum P.E
Maximum P.E = mgh
Maximum P.E = 2 × 9.8 × 20 = 392 J
But
K.E = 1/2mv^2
Substitute the values of energy and mass into the formula
392 = 1/2 × 2 × V^2
V^2 = 392
V = sqrt( 392 )
V = 19.8 m/s
V = 20 m/s approximately
At a certain time a particle had a speed of 17 m/s in the positive x direction, and 3.0 s later its speed was 28 m/s in the opposite direction. What is the average acceleration of the particle during this 3.0 s interval
Answer:
i wanna say 11 forgive me if wrong.
Explanation:
What is the difference between virtual images produced by concave, plane and convex mirrors? What does the negative sign in the value of magnification produced by a mirror indicates about an image?
which of the following can be used to measure mass
Answer:
there are no options
Explanation:
4. What do you think about science?
Answer:
science can be either very simple or very complex. there are many different subjects and units in science, and there are many different types of science.
Answer:
I like science because the topics are very interesting and some of the projects you do are really fun and intriguing
Hope this helps! （づ￣3￣）づ╭❤～
Explanation:
How long would it take a hawk to stop if he was flying at 9m/s and decelerated at 3m/s2?
Answer:
3 seconds
Explanation:
From the question above,
we can apply the first equation of motion which is,
a = (v-u)/t.................... Equation 1
Where a = acceleration. v = final velocity, u = initial velocity, t = time.
make t the subject of the equation
t = (v-u)/a.............. Equation 2
Given: a = -3 m/s²(decelerating), u = 9 m/s, v = 0 m/s (to stop)
substitute these values into equation 2
t = (0-9)/-3
t = -9/-3
t = 3 seconds
how does an atom charge if all the electrons are removed
Answer: its does not have any charge but it still might have nuetrons.
Explanation:
Answer:
it will change to become a positively charged ion called a cation.
Explanation:
Ions are formed when an atom gains or loses electrons from its valence shell. This process causes an imbalance between the number of positively charged protons and negatively charged electrons, so the overall ion will carry a net positive or negative charge (I got this explanation from google)
The potential energy of a pear is 5.0 joules. The pear is 4 m high. What is the mass of the apple?
Answer:
rrteertewtagtewyewtyewtewy
Explanation:
As temperature increases, ________. Group of answer choices the resistance of a conductor remains the same the resistance of a conductor increases the resistance of a conductor decreases the voltage of the conductor decreases
Answer:
resistance of a conductor increases
Explanation:
The resistance of conductors is directly proportional to the temperature of the conductor. This implies that when the temperature of the conductor is increased, the resistance of the conductor increases likewise.
This is applied in the resistance thermometer. Resistance thermometers are useful for accurate temperature measurements at very high or very low temperatures.
The unit of force,newton is a derived unit.why?
Answer: Newton, the unit of force, is defined based on Newton's Second Law (F=ma), as the force required to give a mass of one kilogram an acceleration of 1 meter/second2. Thus, it is derived from these other units.
Explanation:
Answer:
The unit of force is a derived unit.
Why because it isn't part of the fundamental units which is MLT which stands for mass,length and time.....MLT are the units that brings out the derived units that's why it is called derived units because it is derived from fundamental units so Newton/force is not part of the fundamental unit and if we find the dimension of force you will see that it will be L^2T^-2.....which means it is derived from fundamental unit which makes it a derived unit....Thank you for the question
A NASA spacecraft measures the rate of at which atmospheric pressure on Mars decreases with altitude. The result at a certain altitude is: Convert to .
Answer:
[tex]= 4.21\times 10^{-10}J/cm^4[/tex]
Explanation:
According to the given situation, the computation is shown below:-
[tex]1kPa=10^3Pa[/tex]
So,
[tex]1Km = 10^5cm[/tex]
[tex]1kPa=0.01Pa/Cm[/tex]
[tex]1kPa=10^{-8}J/cm^4[/tex]
Now as per the question it is given that
r = 0.0421KPa/Km
= [tex]0.0421KPa/Km \times \frac{10^{-8}J/cm^4}{1KPa/Km}[/tex]
after solving the above equation we will get
= [tex]0.0421\times 10^{-8}J/cm^4[/tex]
or we can write the above equation in this manner, that is
[tex]= 4.21\times 10^{-10}J/cm^4[/tex]
Therefore we have solved the equation to reach the right answer.
Convert 2.5 feet into inches. (1 ft = 12 in)
Answer: 30 inches
Explanation: 12x2.5=30
Answer:
Explanation:
1 feet = 12 inch
2.5 feet = 2.5 × 12
= 30 inch
Hope this helps
plz mark as brainliest!!!!
When neither plate is dense enough to sink into the asthenosphere, the result is a _____ plate boundary.
Answer: Convergent collision
When neither plate is dense enough to sink into the asthenosphere, the result is a Convergent (Colliding) plate boundary
In asthenosphere, when plates move towards each other and collide, it is called Convergent Colliding.
When Oceanic lithosphere moves away from the rising thermal currents at divergent plate boundaries it get crust and cools at the boundaries..
As Oceanic lithosphere cools, the density of the rigid plate increases.
At some plate margins, Oceanic cooler plate became more dense and hot s compared to asthenosphere plate, the plate is sinking beneath the adjacent plate and back into the hotter, deeper regions. This is called subduction. Subduction occurs along convergent plate margins.
For more details, follow the link given below.
https://brainly.com/question/5022534.
If Julie applies 2.67 Newtons of force down onto the table, how
many pounds of force is she applying? Llbs (Write your
answer two significant figures)
Answer:
0.6 pound.
Explanation:
From the question given above:
Julie applies 2.67 Newton (N) of force down onto the table.
Hence, we can obtain the force in pound applied by Julie on the table as follow:
Recall:
1 N = 0.225 pound
Therefore,
2.67 N = 2.67 × 0.225
2.67 N = 0.6 pound
Therefore, the force in pound applied by Julie on the table is 0.6 pound