Answer:
Here we will assume two things.
His acceleration is constant until he reaches his maximum velocity and then he stops accelerating.
When he leaves the blocks, his velocity is "zero", meaning that the initial velocity is zero.
Then:
For the acceleration of the sprinter we will have a constant, A:
a(t) = A.
for the velocity we need to integrate over time, we will get
v(t) = A*t + v0
Where v0 is a constant of integration, and this is the initial velocity, as we already said, this will be zero, so the velocity equation is:
v(t) = A*t
We know that at t = 7.17 seconds, his velocity is 12.28m/s
then:
v(7.17s) = 12.28m/s = A*7.17s
12.28m/s/7.17s = 1.71 m/s^2 = A.
The acceleration is: 1.71 m/s^2 for 0 < t < 7.17s
0 m/s^2 for 7.17s < t.
This is because that was his maximum velocity, then after that time he can not accelerate more.
I need help please; I'll mark you brainliest
Answer:
Its number 1.
Explanation:
Speed, being a scalar quantity, is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. ... Velocity is the rate at which the position changes. The average velocity is the displacement or position change (a vector quantity) per time ratio.
Answer:
It’s both I and II
Explanation:
Speed refers to how fast something goes by using the equation distance/time. So it only uses distance and time.
On the other hand velocity is basically speed, so it uses distance/time, but the only difference is velocity uses direction.
What is KBr (periodic table) def
Answer: Answered already
Explanation:
A net force of 12.0 N causes an object to increase its speed from 15.0 m/s to 18.0 m/s during a 2.0 second interval. What is the mass of the object?
Answer:
Mass of object = 8kg
Explanation:
Since a= change in v/ change in t, a= (18-16)/2= 1.5
And F=ma Force =12a= 1.5m=?You can now solve for your unknown value of mass.
A net force of 12.0 N causes an object to increase its speed from 15.0 m/s to 18.0 m/s during a 2.0 second interval. The mass of the given object 8 Kg.
What is force?
A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Since a = change in v/ change in t,
a = (18-16)/2
a = 1.5
Force, f = ma
mass, m = F/a
m = 12/1.5
m = 8 Kg.
A net force of 12.0 N causes an object to increase its speed from 15.0 m/s to 18.0 m/s during a 2.0 second interval. The mass of the given object 8 Kg.
To learn more about force refer to the link:
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Which two actions could you take to weaken an electromagnet?
A. Use a wooden core instead of a steel core.
B. Replace a 9 V battery with a 3 V battery.
O C. Decrease the length of the connecting wires in the circuit.
D. Increase the number of wraps of wire around the core.
E. Include an ammeter in the circuit.
Answer:
a and b
Explanation:
first one breaks it and second one directly makes it weaker
Answer:
A and B
Explanation:
took the test
6. A sled traveling at a speed of 3.0 m/s slows to a stop 4.0 m from the point where
its passenger rolled off. What is the magnitude of the horizontal net force that
slows the 110 N sled? (Assume ag = 10m/s2)
D
Answer:
-12.38 N
Explanation:
This question requires you to first find the acceleration then apply Newton's 2nd law of motion to find the force.
To find deceleration use the formula;
v²= u²+2ad ---where
v= final speed = 0 m/s
u= initial speed = 3.0 m/s
a= acceleration { in this case , deceleration} = ?
d= distance from the point where its passenger rolled off= 4.0 m
therefore ;
[tex]a=\frac{v^2-u^2}{2d}[/tex]
[tex]a=\frac{0^2-3^2}{2*4} =\frac{-9}{8} m/s^2[/tex]
Mass of the sled is calculated from its weight force.
Weight force = mg
mass of sled = weight force / g where g= 10 m/s²
mass of sled = 110/10 = 11kg
The magnitude of horizontal net force will be : F= ma where ;
m= mass of sled = 11 kg
a= deceleration = -9/8 m/s²
F = 11 * -9/8 = -12.38 N
Force is acting on the opposite direction of the initial motion of the sled.
The magnitude of the horizontal net force acting on the sled is 12.375 N.
Given data:
The initial speed of sled is, u = 3.0 m/s.
The final speed of sled is, v = 0 m/s.
The distance covered before stopping is, s = 4.0 m.
The weight of sled is, W = 110 N.
Using the Newton's second law, the net horizontal force acting on the sled is given as,
F = ma
here,
m is the mass of sled.
a is the acceleration of sled.
Mass is calculated from the weight as,
W = mg
110 = m (10)
m = 11 kg.
Now, using the second kinematic equation of motion to obtain the acceleration of sled as,
[tex]v^{2}=u^{2}+2(-a)s\\\\0^{2}=3^{2}+2(-a)4\\\\8a=9\\\\a=1.125 \;\rm m/s^{2}[/tex]
Then the magnitude of net horizontal force is,
[tex]F = ma\\\\F = 11 \times 1.125\\\\F = 12.375\;\rm N[/tex]
Thus, we can conclude that the magnitude of the horizontal net force is 12.375 N.
Learn more about the Newton's second law here:
https://brainly.com/question/19860811
What is the distance a shark can cover while swimming at a speed of 15.25 m/s for 18 seconds?
Answer:
274.5
Explanation:
Connie flew from Phoenix to flagstaff, a distance of 180 miles at a constant speed of 180 miles per hour. She then returned to the same airport at a stand speed of 90. Miles per hour. What was Connie average speed in miles/ hour
Answer:
120 miles/hour
Explanation:
The average speed is the ratio of total distance covered by an object or a body to the total time taken to cover the distance.
Mathematically,
Average speed = total distance covered/total time taken
In the case of Connie:
total distance = 180 + 180 = 360 miles
In order to calculate the time for each trip
speed = distance/time
time = distance/speed
From Phoenix to flagstaff:
time = 180/180 = 1 hour
From flagstaff back to Phoenix:
time = 180/90 = 2 hours
total time taken = 1 + 2 = 3 hours
Average speed = 360/3 = 120 miles/hour
Hence, the average speed is 120 miles per hour.
How massive is a frisbee if it accelerates at 12 m/s/s when a force of 6 newtons is applied to it?
Set-up: Set initial speed at 15 m/s. Set the height of the cannon to 0 meters. Be sure that air resistance is NOT checked.
B. 2. Our independent variable in this simulation will be the launch angle. Keeping the speed at 15 m/s, vary the launch angle as indicated in the table below. Drag the crosshairs marked with time and range to the spot where the object landed. Then drag the crosshairs to the top of the parabola to find max height. Fill in the table below with the values.
Answer:
tatti kha le
Explanation:
If mass1 of a student is 70 kg and mass of the Jupiter is 1.901 x 10^27 kg 1
and the distance between them is 6.98 x 10^7 m. Calculate for the Force
of Gravity in Newtons.
Answer:
lol girly same
Explanation:
what type of energy is mowing a lawn ? quick pleaseeeeeeeeeeeeeeeeeeeee
Answer:
Movement is mechanical energy. When someone drives a car or runs a gas powered lawn mower, the gasoline burns in the engine. The engine transforms the chemical energy of the burning gasoline into mechanical energy to move the car or mower.
From: Sciencetimego.com
Answer:
mechanical energy
Explanation:
Which of the following statements best describes an electromagnetic wave with a short wavelength?
A.)It has a low frequency and can travel in a vacuum (space)
B.)It has a high frequency and can travel in a vacuum (space
C.)It has a low frequency and can only travel in a medium
D.)It has a high frequency and can only travel in a medium
Electromagnetic wave has a high frequency and can travel in a vacuum or space.
It has a high frequency and can travel in a vacuum or space is the statement which best describes an electromagnetic wave having shorter wavelength because electromagnetic waves having shorter wavelength has high frequency and it can propagate through space means need no medium for propagation.
The transmission of electromagnetic waves does not require a medium and they are able to travel through vacuums or space. Ultraviolet light, X-rays, and gamma rays are the examples of electromagnetic waves so we can conclude that electromagnetic waves having shorter wavelength has high frequency and it can propagate through space.
Learn more: https://brainly.com/question/19354446
which are considered noble gases
Answer:Argon
Neon
Helium
Krypton
Xenon
What is the Nervous System made up of?
Answer:
Hope this helps you mate.
Explanation:
Nervous system consists of brain,spinal cord and nerves.
Write one use of magnetic force and frictional force
Answer:
1.Magnetic Force - Used in cranes to separate metal junk from junkyards.
2.Frictional Force- Helps us to walk.
If an ant can move at a speed of 1.2mm/s, calculate the time taken by
it to travel 1km.
Answer:
Work shown below!
Explanation:
[tex]Time=\frac{Distance}{Speed} =\frac{1km}{1.2mm/s}=\frac{1}{1.2}=0.8333333[/tex]
Why does the law of conservation of energy limits the efficiency of any machine.
Answer: Because machines cannot create new energy themselves, they merely change its direction, its form, the amount applied, or the distance it is applied over. Therefore, although it may seem like machines make things easier, in reality they just convert one form of energy into another, and cannot multiply energy or work.
Explanation:
Which factor does not affect the strength of an electromagnet?
O A. The number of coils of wire
O B. The material of the core
C. The placement of the ammeter in the circuit
O D. The number of batteries added to the circuit
C. The placement of the ammeter in the circuit
at the instant shown in the diagram, the car's centripetal acceleration is directed
Answer:
At the instant shown in the diagram, the car's centripetal acceleration is directed is discussed below in detail.
Explanation:
The direction of the centripetal acceleration is in a circular movement is forever towards the middle of the roundabout pathway. In the picture displayed, the East direction is approaching the center. So, the course of the car's centripetal acceleration is (H) toward the east.
2. A squirrel runs 15 m to the north and finds an acorn. The squirrel then turns back to the south
and runs 8 m, at that point he decides to change direction and runs 24 m to the east to bury his
acorn.
Answer:
24 m to the right/ to the east
if i want an thrilling job witch should i chose im stuck beetween,
1. horse rider
2. drawer
3. photographer
Answer:
horse rider
Explanation:
it will help in the future and its fun
A tall tree has more chance to break during the storm, why?
because the top part become weaker
Explanation:
Unfortunately, all trees have some potential to fail during heavy winds or other harsh elements, such as snow and ice. ... In these incidences, the tree trunk acts as a lever and the force applied to the roots and trunk increases with height and mass. Taller trees are more susceptible to windthrow.
"Windthrow" is a phenomenon that uproots a tree because the trunk acts as a lever applying force to the roots. ... Trees are more likely to uproot during strong winds especially if the tree is top-heavy which can also result in tearing, splitting and limb breakage
What is an element and comepounds
Answer:
Explanation:
Element: consists of only one kind of atom, can't be broken down into a simple type of matter by either physical or chemical means and can consist as either atoms or molecules
Compound: consists of atoms of two or more different elements bound together, can be broken down into simpler types of matter by chemical means BUT not by physical means, has properties that are different from its component elements and always contain the same ratio of its component atoms.
The diagram shows an electric generator containing an electromagnet when the generator is working, what is in the wire?
A. Electric current
B. Chemical energy
C. Permanent magnets
D. Small batteries
Answer:
its electric current
Explanation:
Help please 20 points ? ASAP
Answer:
21: Mass
22: Unbalanced Force
23: Friction
24: Balanced
Explanation:
30 POINTS PLS ANSWERRRR
For each of Newton’s three laws of motion, compare hitting a 500-g croquet ball with a mallet to hitting a 56-g tennis ball with the same mallet and the same amount of force.
Answer:The croquet ball velocity v will be 56/500 the tennis ball velocity V after the impulse.
The second law (force = mass*acceleration) says that the same force will accelerate the balls by the inverse of their mass. That is, the force will continuously change the momentum:
f = 500a = 56A
Therefore a = f/500 and A = f/56
and a/A = 56/500.
The croquet ball will accelerate less, for whatever time or distance you apply the force.
The third law: for every action, there is an equal and opposite reaction. So, if in fact you apply the same force to strike each ball, you will feel the same reaction. That’s probably easier to do for a quick strike (the impulse case above) than for a long, smooth acceleration over distance, because the balls have very different elastic response. The body can tell how equally you applied force!
Explanation:
What is the potential energy of a 2kg plant that is on a windowsill 1.3m high?
Answer:
P.E = 25.48 Joule
Explanation:
Here,
mass (m) = 2kg
height (h) = 1.3m
g = 9.8m/s^2
P.E = mgh
= (2) (9.8) (1.3)
P.E = 25.48 Joule
Thus, the potential energy of a 2kg plant that is on a windowsill 1.3m high is 25.48 Joule
-TheUnknownScientist
Which best explains why the shape of a liquid can change? (1 point) a The particles have just enough energy to move past each other. b The particles are charged. c The particles move at very high speeds at all times. d The particles are highly compressible.
Answer:
The particles have just enough energy to move past each other.
Answer:
A
Explanation:
Solid's particles cannot move past each other and are stuck in place. Liquid's particles are able to slightly move past each other. And gas's particles move freely.
Hope this helps!
What happens whenever energy is transformed from one form to another?
Answer:
Energy transformation is when energy changes from one form to another – like in a hydroelectric dam that transforms the kinetic energy of water into electrical energy. While energy can be transferred or transformed, the total amount of energy does not change – this is called energy conservation.
Explanation:
Hope This Helps!!
God Bless!!
~DuffyDuck~
What is a gene?
A.
A segment of a protein
B.
A segment of a DNA molecule
C.
A series of amino acids
D.
A series of DNA molecules
Answer:B. A segment of a DNA molecule
Explanation:
