Answers
Answer:
Explanation:
Key Points
The four kinematic equations involve five kinematic variables:
Each equation contains only four of the five variables and has a different one missing.
It is important to choose the equation that contains the three known variables and one unknown variable for each specific situation.
Answer:
A:
The displacement is 0 meters because it just moved back to its original position.
The distance traveled(in meters) is just the speed times the time, which is 18 m/s * 3600 s = 64800 meters.
B:
In this case, the displacement and the distance traveled are the same because the object didn't change direction.
The distance traveled(in meters) and the displacement is just the speed times the time, which is 16 m/s * 15 s = 240 meters.
C:
In this case, the displacement and the distance traveled are the same because the object didn't change direction.
We can use the equation (Final Velocity)^2 = (Initial Velocity)^2 + 2*Acceleration*Distance.
Now we can plug the known values: (5)^2 = (20)^2 + 2*(-4)*d, and now we solve for d: 25 = 400 + -8d -> -375 = -8d -> d = 46.875 meters.
D:
Again, in this case, the displacement and the distance traveled are the same because the object didn't change direction.
We can use the equation Distance = (Initial Velocity) * (Time) + 1/2 * (Acceleration) * (Time)^2.
Plugging in the values we know, we get d = 0*20 + 1/2*3.7*20^2 -> d = 740 meters.
E:
Again, in this case, the displacement and the distance traveled are the same because the object didn't change direction.
We can use the equation Distance = (Initial Velocity) * (Time) + 1/2 * (Acceleration) * (Time)^2.
Plugging in the values we know, we get d = 12*26 + 1/2*1.5*26^2 -> d = 819 meters.
If you have further questions please don't hesitate to ask.
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Related Questions
how will you place the coin inside the glass without touching it?
Answers
hmmmmmmmmmmmmmmmmmmmmm
A sprinter running a 100 m race starts at rest, accelerates at constant acceleration of magnitude A for 2 seconds, then runs at a constant speed until the end. Find the position (relative to the start) and speed of the runner at the end of the 2 seconds, in terms of A.
Answers
Answer:
The distance ran by the runner in the 2 seconds is 2·A
The speed of the runner at the end of the 2 seconds is 2·A
Explanation:
The given information are;
The distance the sprinter is running = 100 m
The initial constant acceleration of the sprinter, a = A
The duration of the initial acceleration, t = 2 s
The initial speed of the printer, u = 0 (The sprinter starts from rest)
The rate with which the sprinter then runs with to the end = Constant speed
Therefor, we have, from the equation of motion;
s = u × t + 1/2 × a × t²
Where;
s = The distance ran by the sprinter
∴ at t = 2 seconds, we have;
s = 0 × 2 + 1/2 × A × 2² = 1/2 × A × 4 = 2·A
The distance ran by the runner in the 2 seconds = 2·A
The speed, v, of the runner at the end of the 2 seconds is given as follows;
v = u + a × t
When t = 2 seconds, we have;
v = 0 + A × 2 = 2·A
The speed of the runner at the end of the 2 seconds = 2·A.
what is accelaration
Answers
Answer:
it like too gain speed like a car
A car is traveling with an initial velocity of 15 m/s when the driver decides to go faster by accelerating at 5 m/s squared for 10 seconds. How far did the car travel during this time?
Answers
Answer:
x = 400 [m]
Explanation:
To solve this problem we must use the following kinematics equations, first, we find the final speed, and then we proceed to find the distance traveled.
[tex]v_{f}=v_{i} +(a*t)\\[/tex]
where:
Vf = final velocity [m/s]
Vi = initial velocity = 15 [m/s]
a = acceleration = 5 [m/s^2]
t = time = 10 [s]
Note: the positive sign in the Equation indicates that the car is accelerating, i.e. its speed is increasing.
Now replacing
Vf = 15 + (5*10)
Vf = 65 [m/s]
Now using the second equation:
[tex]v_{f} ^{2}= v_{i} ^{2}+(2*a*x)[/tex]
where:
x = distance traveled [m]
x = (65^2 - 15^2)/ (2*5)
x = 400 [m]
A car is traveling on a level road at a constant rate of speed. What additional force is necessary to bring the car into equilibrium? zero. greater than the normal force times the coefficient of static friction. the normal force times the coefficient of kinetic friction. equal to the normal force times the coefficient of static friction.
Answers
Answer: Zero.
Explanation:
By the first Newton's law, we know that:
every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.
Now, we know that the car is moving with constant speed, then there is no net force acting on the car, which means that the car is already in equilibrium.
Then if we add one force to the situation, the car will not be anymore in equilibrium.
The correct option is zero.
What is the density of a 36 g object with a volume of 15 cm3? (Density: D = )
0.42 g/cm3
0.54 g/cm3
2.4 g/cm3
5.4 g/cm
Answers
Answer:
The answer is 2.4 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 36 g
volume = 15 cm³
We have
[tex]density = \frac{36}{15} = \frac{12}{5} \\ [/tex]
We have the final answer as
2.4 g/cm³Hope this helps you
What is the displacement when t =2s to 3s
Answers
Answer:
t=5s
Explanation:
t=2 + t= 3s = t= 5s
A wave traveling at 100 m/s has a frequency of 200Hz. What is the wavelength of this wave?
Answers
100/200= .5
The wavelength is .5
The most popular throw in ultimate frisbee is the what?
Answers
Answer:
The hammer.
Explanation:
The most practiced throw in Ultimate. A hammer is an overhead throw held with the forehand grip
Answer:
HAMMER.
Explanation:
Ah, the hammer. The most practiced throw in Ultimate. A hammer is an overhead throw held with the forehand grip
A car is traveling 24.8 m/s and speeds up to 26.8 m/s in 4.3 seconds. What is the car's average acceleration during this time?
Answers
≈ 0.47 m/s²
Explanation:Hi there !
Acceleration formula
a = (v₂ - v₁)/t
a = (26.8m/s - 24.8m/s)/4.3s
= (2m/s)/4.3s
≈ 0.47 m/s²
Good luck !
1.
What is a force? What changes can be produced by a force?(AS)
Answers
Answer:
the pull or push which changes or tends to change the position of an object from rest to motion or motion to rest is called force.
Changes of force that can be produced:
Force can change the shape of a body.Force can change the position of a body.Force can stop the moving body.Force can change the speed of a moving body.Force can change the direction of a moving body.explain the types of motion
Answers
Answer:
there are three type of notion
The sound of frequency greater than 20,000 Hz is called ....
20,000 112 से अधिक आवृति की ध्वनि
कहा जाता है।
Positive electrode is called
घनात्मक इलेक्ट्रोड को
कहते हैं।
d.
Answers
Answer:
ultra sound... follow me
12. The resistivity of a given wire of cross-sectional
area 0.7mm 4.9 x 10raised to the power of -4ohm mm. Calculate the
resistance of a 2ohm length of the wire
Answers
R = resistivity × (l/A), A = πr^2= πd^2/4
2 =( 4.9 × 10^ -4) * (l/π0.7^2/4)
make l the subject and calculate.
i assumed we are looking for the length if the wire.
What is the acceleration of the car from 0 to 2 s ? - What is the magnitude of the net force exerted on the car from 0 - 2s ? - What is the acceleration of the car from 2 s to 4s - What is the magnitude of the force exerted in stopping the car ? What is the instantaneous velocity at 1 ?
Answers
Answer:
a) a = 0 m / s²
, b) a = 0 ==> F = 0
, c) a = - 2 m / s²
,d) v = 4 m/s
Explanation:
a) It is asked to find the acceleration in the interval from 0 to 2s, from the graph we see that in this interval the velocity is constant with a value of 4 me / s, therefore the average eceleration is
a = (V₂ - V₁) / t
a = (4 -4) / 2
a = 0 m / s²
b) Newton's second law establishes a relationship between force and acceleration
F = m a
as acceleration is zero
a = 0 ==> F = 0
c) the acceleration in interval 2 a4 S
a = (0 - 4) / (4-2) = -4 / 2
a = - 2 m / s²
The negative sign iniquity the acceleration is slowing the movement
d) the force is
F = m a
F = 2 m
e) from the graph we can read the speed of the vehicle for time
v = 4 m / s
Can two vectors of an unequal magnitude add up to give a vector with a magnitude of zero?
Answers
hello what is quantum physics
Answers
Answer:
It is a fundamental theory in physics that provides a description of the physical properties of nature at the scale of atoms and subatomic particles.
(BRAINLIEST AND 13 POINTS) Which two variables have an effect on the momentum of an object?
a. mass and position b. mass and velocity c. position and velocity
Answers
Answer:
B mass and velocity......................
As formula of momentum is mass multiplied by velocity
What is the pressure exerted by a column of water 80 cm high ?
Answers
Answer:
[tex]P=7,840\ Pa[/tex]
Explanation:
Pressure Exerted by a Column of Liquid
The pressure P exerted by a column of liquid of height h and density ρ is given by the hydrostatic pressure equation:
P = ρgh
Where ρ is the density of the liquid, g is the acceleration of gravity g=9.8m/s^2, and h is the height of the column of liquid.
The data provided is as follows:
[tex]\rho=1000\ Kg/m^3[/tex]
[tex]g=9.8m/s^2[/tex]
[tex]h=80\ cm = 0.8\ m[/tex]
The pressure is:
[tex]P = 1000\ Kg/m^3\cdot 9.8\ m/s^2 \cdot 0.8\ m[/tex]
[tex]\boxed{P=7,840\ Pa}[/tex]
Pete rides his horse 64 km in 4 hours.
What is his average speed in kilometers
per hour?
Given:
D=64 km
T=4 hour
Answers
Answer:
His average speed is
[tex] \frac{64km}{4h} = {16kmh}^{ - 1} [/tex]
A 2.50-mL sample of ammonia gas (NH3) is heated from 325 kelvin to 425 kelvin. What is the new volume of the sample?
Answers
Answer:
The new volume of the [tex] NH_{3}[/tex] sample is 3.27mL.
Explanation:
Given the following data;
Original Volume, V1 = 2.50-mL
Original Temperature, T1 = 325K
New Temperature, T2 = 425K
To find new volume V2, we would use Charles' law.
Charles states that when the pressure of an ideal gas is kept constant, the volume of the gas is directly proportional to the absolute temperature of the gas.
Mathematically, Charles is given by;
[tex] VT = K[/tex]
[tex] \frac{V1}{T1} = \frac{V2}{T2}[/tex]
Making V2 as the subject formula, we have;
[tex] V_{2}= \frac{V1}{T1} * T_{2}[/tex]
[tex] V_{2}= \frac{2.50}{325} * 425[/tex]
[tex] V_{2}= 0.0077 * 425[/tex]
V2 = 3.27mL
Therefore, new volume of the [tex] NH_{3}[/tex] sample is 3.27mL.
A car is driving at a velocity of 24 m/s. If its brakes can supply an acceleration of -5.0 m/s2, how much time will be required to bring the car to a stop?
10.2 s
-29 s
0 s
4.8 s
Answers
Which sentence describes the direction in which heat flows between any two objects?
A.
Heat flows from the object with less internal energy to the object with more internal energy.
B.
Heat flows from the object with a higher specific heat to the object with a lower specific heat.
C.
Heat flows from the object with a lower specific heat to the object with a higher specific heat.
D.
Heat flows from the object at a higher temperature to the object at a lower temperature.
Answers
Answer: D just took the test
Explanation:
Answer:
D
Explanation:
Which of the following examples shows that a chemical reaction has occurred?
O A solid is formed when heat is removed from a sample of water.
A rock breaks into smaller pieces when it is struck with a hammer.
O A cup of water turns pink when a few drops of red food coloring are added.
Bubbles form when baking soda is added to vinegar and mixed.
Answers
Formation of bubbles when baking soda and vinegar are mixed is an example showing a chemical reaction has occurred as these two substances on mixing form sodium acetate.
What are chemical reactions?
Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and reactions are accompanied by an energy change as new substances are formed.
Learn more about chemical reactions,here:
https://brainly.com/question/14929452
#SPJ2
When does air become turbulent around a thrown ball?
A. On the smooth side of a ball
B. On the rough side of a ball
C. On the right side of a ball
Answers
Answer: B (on the rough side)
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Air will become turbulent around a thrown ball on the rough side of the ball because it will cause the air waves to be irregular. Option B is the right answer.
When an object is moving in air, it moves smoothly if the shape is streamlined and the body of the object is smooth.
An object will experience turbulence when the air waves are violent and are irregular.
Therefore, air will become turbulent around a thrown ball on the rough side of the ball because it will cause the air waves to be irregular.
The correct answer is option B.
Learn more about turbulence here: https://brainly.com/question/4853035
2. _____ - changes in appearances of the Moon as viewed from Earth, due to the relative positions of the Moon, Earth, and the Sun.
A. Maria
B. Moon phase
C. Solar eclipse
D. Lunar eclipse
Answers
Answer:
Moon Phase
Explanation:
The part of a longitudinal wave where the particles are spread apart is called a______?
Here are the choose of answers: A- Top Wave has the highest pitch because it has the highest amplitude.
B - Bottom Wave has the highest pitch because it has the lowest frequency.
C- Bottom Wave has the highest pitch because it has the highest frequency.
D- Both waves have the same pitch because they both have the same frequency
Answers
These are the parts of a wave that are further apart and the ones that are close together are called compressions.
I don’t think it is any of the choices stated above!
A materials density is the same , no matter how large or small the sample is or what it’s shape is as long as it is solid uniform piece of the material explain how this is possible and give an example
Answers
Answer:
See the explanation below
Explanation:
Density is defined as the relationship between mass and volume, i.e. the following equation can be used:
density = m/v
where:
density [kg/m^3]
m = mass [kg]
v = volume [m^3]
If we change the volume of a body by reducing its size, its mass will also decrease proportionally with a density as seen in the equation.
m = density*v
To understand this concept more clearly, let's use the following example:
We know that the density of water is equal to 1000 [kg/m^3], that is, 1 cubic meter of water contains 1000 kilograms of water, using the equation.
1000 = m /1
m = 1000*1 = 1000 [kg]
Now if we have 500 kilograms of water, that would pass with the volume so that the density remains constant.
1000 = 500/v
v = 500/1000
v = 0.5 [m^3]
We can see that the volume of water has halved. Since the mass of water was reduced by half. That is, the relationship between mass and volume is proportional to the density of the material or substance.
From the moment a 40 m/s fastball touches the catcher’s mitt until it is completely stopped takes 0.012 s. Calculate the average acceleration of the ball as it is being caught.
Answers
Answer:
3333.33 m/s²
Explanation:
From the question given above, the following data were obtained:
Total Velocity (v) = 40 m/s
Total Time (t) = 0.012 s.
Average acceleration (a) =..?
Average acceleration can be defined as follow:
Average acceleration (a) = Total velocity (v) / total time (t)
a = v / t
With the above formula, we can obtain the average acceleration of the ball as shown below:
Total Velocity (v) = 40 m/s
Total Time (t) = 0.012 s.
Average acceleration (a) =..?
a = v / t
a = 40 / 0.012
a = 3333.33 m/s²
Therefore, the average acceleration of the ball is 3333.33 m/s².
Which of the following statement is not true regarding liquid pressure?
liquid pressure increases as the height of liquid column increases.
liquid pressure increases with increase in density of the liquid
liquid pressure at same depth is same
liquid pressure is not affected by acceleration due to gravity