You stand on a merry-go-round which is spinning at f = 0:25 revolutions per second. You are R = 200 cm from the center. (a) Find the angular speed ! At which it is spinning. (b) Find the centripetal acceleration, ac with which it is spinning. (c) What is the minimum coefficient of static friction is between your shoes and the floor that will keep you from slipping off?
Answer:
(a) ω = 1.57 rad/s
(b) ac = 4.92 m/s²
(c) μs = 0.5
Explanation:
(a)
The angular speed of the merry go-round can be found as follows:
ω = 2πf
where,
ω = angular speed = ?
f = frequency = 0.25 rev/s
Therefore,
ω = (2π)(0.25 rev/s)
ω = 1.57 rad/s
(b)
The centripetal acceleration can be found as:
ac = v²/R
but,
v = Rω
Therefore,
ac = (Rω)²/R
ac = Rω²
therefore,
ac = (2 m)(1.57 rad/s)²
ac = 4.92 m/s²
(c)
In order to avoid slipping the centripetal force must not exceed the frictional force between shoes and floor:
Centripetal Force = Frictional Force
m*ac = μs*R = μs*W
m*ac = μs*mg
ac = μs*g
μs = ac/g
μs = (4.92 m/s²)/(9.8 m/s²)
μs = 0.5
A sound signal traveling underwater has a frequency of 230 hertz. The speed of sound underwater is 1.45 × 103 meters/second. What is the wavelength of the sound signal?
Wavelength = (wave speed) / (frequency)
= (1,450 m/s) / (230 / sec)
= 6.30 meters (rounded)
Hope this helped friend! :)
Answer the wave length is 263
Explanation
Given a force of 100 N and an acceleration of 5 m/s2, what is the mass
Answer:
20 kg
Explanation:
Mass equals force divided by acceleration, so divide 100 N by 5 m/s2 and you get your mass: 20 kg
Answer: m= 20 kg
Explanation: Use the formula
F = m a
to solve this.
100 N = m (5 m/s²)
100 N / (5 m/s²) = m
20 kg = m
(N is also kgm/s², so when you divide by m/s², you are left with kg.)
An object accelerates 12.0 m/s² when a force of 6.0 newtons is applied to it.
What is the mass of the object
Answer:
0.5 kgExplanation:
The mass of the object can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{6}{12} = \frac{1}{2} \\ [/tex]
We have the final answer as
0.5 kgHope this helps you
m = f/a
6 / 12 = 0.5
answer - 0.5
HELP!!
You walk 130 m E and then turn and walk another 43m [E 28 degree S] what is the total displacement?
Answer:
Total displacement 155 m
Explanation:
From the question, the formula to apply will be that of cosine rule where:
[tex]c=\sqrt{a^2+b^2-2ab*cosC}[/tex]
where
a= 43 m , b=130m and c =? , <C=28° + 90° =118°
Substituting values in the equation as;
[tex]c=\sqrt{43^2+130^2-2*43*130*cos118}[/tex]
[tex]c=\sqrt{1849+16900-11180*-0.46947} \\\\c=\sqrt{1849+16900+5249} \\\\c=\sqrt{23998} \\\\\\c=155m[/tex]
What is a bond between a positive and a negative ion charge?
Answer:
Ionic Bond
Explanation:
Answer:
An ionic bond
What does rain look like?
Answer:
is about something failing down
it is a water
Explanation:
it falls after the clouds are full from either evaporation or transportation in the water cycle but do not drink it, it is very dirty and bad for you
Helpp pls, with explanation
Answer:
B .
Explanation:
Elastic potential energy stored in a spring is given by;
E=1/2*k*{Δl}² where
k= spring constant
Δl = change is length of spring
if k is different the energy stored in the system is different. This is true also in the case where Δl is different.
For a parallel system, springs help each other to carry the weight. The stiffness doubles up to mean ;
k parallel =2k
and
Δl parallel = 1/2 Δl
so;
E in one spring = 1/2*k*{Δl}²----------{a}
Using {a} this in the parallel system;
E parallel = 1/2 * 2k * {1/2Δl}²
= 1/2 * 2* k* 1/4 *{Δl}²
= 1/2 E in one spring
Answer : Ep / 2
A car travels at 10 m/s for 10 seconds. What distance does the car travel in this time?
Answer:
100 m
Explanation:
if the car travels at 10 m/s for 10 seconds it would travel 100 m during that time.
10*10 = 100
HUUUUURRRRRYYYYY
Latent heat of fusion refers to which changes of state?
liquid to solid or solid to gas
solid to gas or gas to liquid
solid to liquid or liquid to solid
gas to liquid or liquid to gas
Answer:
solid to gas or gas to liquid
Explanation:
welcome
Answer:
solid to gas or gas to liquid
Explanation:
Edge
9.Two people are pushing a broken down car. One pushes 2 m/s east, the other a
1.5 m/s east. Do they have the same or different velocity? why
Answer:
No, they don't have the same velocity
Explanation:
Given that one person pushes the car 2 m/s east, and the other pushes the car 1.5 m/s east.
As velocity is a vector quantity, so, to have equal velocity, both magnitude as well as the direction must be equal.
For the first person:
Magnitute of the velocity = 2 m/s.
The direction of the velocity: Towards east.
For the second person:
Magnitute of the velocity = 1.5 m/s.
The direction of the velocity: Towards east.
As both the person have the same direction but the different magnitude of the velocity, so, they don't have the same velocity.
Mushroom rocks are:
Group of answer choices
A formed by grains of sand blown across the rocks' surfaces.
B rocks with many mushrooms growing around them.
C formed by wind and water erosion.
D All of the above.
Answer and I will give brainiest!!!! How much force is needed to accelerate an object of mass 90 kg at a rate of 1.2 m/s2? 0.013 N 75 N 108 N 1080 N
Answer: the answer is 108 N
Just took the test and got 108 N correct
A 100N effort force is applied to a machine and lifts a 400N object. What is the MA of the machine?
Answer: dum dum
Explanat
calculate the depth of ocean if ultrasonic pulses produced are received after 9 seconds. ( speed of sound in water = 1498m/s )
Answer:
13482m÷2
Explanation:
1498m÷s×9=13482m÷s
The depth of the ocean if the ultrasonic pulses produced are received after 9 seconds will be equal to, 6741 m.
What is Sound?Sound is a mechanical disruption from an equilibrium position that travels through an elastic medium of material.
It is also possible to define sound solely subjectively, as that which is regarded by the ear, but this definition lacks clarity and is overly constrictive because it is useful to talk about sounds that are manufactured by devices other than the human ear, such as dog whistles and sonar machinery, which cannot do hear by human ear.
The features of sound waves must be examined first in any study of sound. Transverse and longitudinal waves are indeed the two fundamental forms of waves, and they vary by the direction in which they move.
As per the given information in the question,
Let the depth is d.
Total distance the pulse has to travel = 2d
Time taken, t = 9 sec
Speed of sound, V = 1498 m/s
Velocity = Distance/time taken
V = 2d/9
d = 1498 × 4.5
d = 6741 m.
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An automobile rounds a curve of radius 50.0 m on a flat road.
The centripetal acceleration to keep the car on the curve is
3.92 m/s2. What is the speed necessary to keep the car on the
curve?
Answer:
14m/s
Explanation:
Given parameters:
Radius of the curve = 50m
Centripetal acceleration = 3.92m/s²
Unknown:
Speed needed to keep the car on the curve = ?
Solution:
The centripetal acceleration is the inwardly directly acceleration needed to keep a body along a curved path.
It is given as;
a = [tex]\frac{v^{2} }{r}[/tex]
a is the centripetal acceleration
v is the speed
r is the radius
Now insert the parameters and find v;
v² = ar
v² = 3.92 x 50 = 196
v = √196 = 14m/s
The speed that is necessary for keeping the car on the curve is 14 m/s.
Given that,
An automobile rounds a curve of radius 50.0 m on a flat road. The centripetal acceleration to keep the car on the curve is 3.92 m/s^2.Based on the above information, the calculation is as follows:
We know that
[tex]a = v^2 \div r[/tex]
Here a denotes the centripetal acceleration.
v denotes the speed.
And, r denotes the radius.
So,
[tex]v^2 = ar\\\\= \sqrt(3.92 \times 50)\\\\= \sqrt{196}[/tex]
= 14 m/s
Therefore we can conclude that the speed that is necessary for keeping the car on the curve is 14 m/s.
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what type of nuclear energy is used for a nuclear reactor power plant
Answer:
Nuclear fission creates heat!!
Explanation:
Reactors use uranium for nuclear fuel. The uranium is processed into small ceramic pellets and stacked together into sealed metal tubes called fuel rods. Typically more than 200 of these rods are bundled together to form a fuel assembly!
P.S. You can search this up!
- Hope this helped you!! :D
A 6.0 kg object is pushed with a force of 12 N. If the mass of the object is cut in half to 3.0 kg, what happens to the acceleration if the force remains constant?
Answer:
aceleration doubles
Explanation:
From Newton's secon law, one has
F=m*a
where F is the force, m the mass and a the aceleration.
In general, if m becomes m/2, in order to have the same force,
the acceleration must be doubled:
[tex]F=m*a=\frac{m}{2} (2*a)[/tex]
In our particular case,
[tex]12=6*a=\frac{6}{2} (2*a)\\12=3(2*a)[/tex]
PLEASE PLEASE PLEASE HELP FAST!!!!!!!!!!!!!!!
Answer:
I have examined the different parts of blub and I assume the answer is (D)T and U
Hope this helps you
An object is dropped into a beaker containing liquid the object drops to the bottom of the beaker therefore
An object is dropped into a beaker containing liquid the object drops to the bottom of the beaker therefore the density of the object is greater than that of liquid inside the beaker.
What is density?The density of a substance indicates how dense it is in a given area. Mass per unit volume is the definition of a material's density. In essence, density is a measurement of how closely stuff is packed. It is a particular physical characteristic of a specific thing.
The Greek scientist Archimedes made the discovery of the density principle. The letter D can also be used to signify density instead of the symbol ρ .
According to Archimedes principle, if an object is dropped into a beaker containing liquid the object drops to the bottom of the beaker, the density of the object is greater than that of the liquid inside the beaker.
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An object is moving across a surface, but it does not gain or lose speed. Which best describes the object’s force?
The net force is positive.
The net force is zero.
The positive force is greater than the negative force.
The negative force is greater than the positive force.
Answer:
An object is moving across a surface, but it does not gain or lose speed, the object's net force is zero.
Explanation: The net force means the vector sum of all the forces acting on an object
Answer:
well its not C
Explanation:
What is the difference in KE between a 52.5 kg person running 3.50 m/s and a 0.0200 kg bullet flying 450 m/s?
(Unit = J)
Answer:
Ek = 1705.28 [J]
Explanation:
In order to solve this problem, we must remember that kinetic energy can be calculated by means of the following equation.
[tex]E_{k}=\frac{1}{2} *m*v^{2}[/tex]
where:
m = mass [kg]
v = velocity [m/s]
Ek = kinetic energy [J] (Units of Joules)
For the person running
[tex]E_{k} =\frac{1}{2}*52.2*(3.5)^{2} \\ E_{k} =319.72[J][/tex]
For the bullet
[tex]E_{k} =\frac{1}{2} *m*v^{2}[/tex]
[tex]E_{k} =\frac{1}{2} *0.02*(450)^{2} \\E_{k}=2025 [J][/tex]
The difference in Kinetic energy is equal to:
Ek = 2025 - 319.72
Ek = 1705.28 [J]
Answer: 1703.44
Explanation: trust
A toyota prius can go from 0 m/s to 30 m/s in 15 s. What is
its acceleration?
Select one:
2 m/s2
15 m/s2
30 m/s2
450 m/s2
Answer:
2m/s2
Explanation:
using v=u+at
a=(v-u)/t
=(30-0)/15
=2
Suman climb a 5 metre high ladder in 10 second calculate his power the mass of his body is 50 kg
Answer:
245W
Explanation:
Given parameters:
Mass of his body = 50kg
Height of climb = 5m
Time = 10s
Unknown:
Power = ?
Solution:
Power is defined as the rate at which work is done;
Mathematically,
Power = [tex]\frac{work done}{time}[/tex]
Work done = mgh
m is the mass
g is the acceleration due to gravity
h is the height
Work done = 50 x 9.8 x 5 = 2450J
Power = [tex]\frac{2450}{10}[/tex] = 245W
help I’ll cash app you $5 if you get it right!
Answer: B and E
Explanation:
White light can be separated into SIX main colors (although colors are continuously blended). List these SIX colors from MOST energetic to least energetic.
Answer:
Violet, blue, green, yellow, orange, red
Explanation:
I just took the astronomy quiz, I got it right
Two pieces of evidence for plate tectonics?
Explanation:
fossil and glaciers is the to pieces of evidence
what is the average speed in 4 seconds going 8 meters
Answer:
Explanation:
speed is define as rate of change of distance or displacement
v=s/t
s=8 m
t=4s
v=8/4
v=2 m/s
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Answer:
i hate thissssssss schoooool
Explanation:
What is the kinetic energy of a 150 gram object moving at a velocity of 100 m/s?
Answer:
750 J
Explanation:
lets convert mass into kg first , 150 /1000 = 0.15 kg
kinetic energy = [tex]\frac{mv^{2} }{2}[/tex] = [tex]\frac{0.15*100^{2} }{2} = 750 J[/tex]
The kinetic energy will be 750 J for an object mass of 150 grams and the object moving at a velocity of 100 m/s.
What is Kinetic Energy?A moving item or particle might have power of a certain type called kinetic energy. When work, which entails the transfer of energy, is done on an object by applying a net force, that object acquires kinetic energy. The kinetic energy of a moving object or particle is a function of its mass and velocity of motion. Vibration, rotation around an axis, translation (or moving along a path from one place to another), or any combination of these might be considered motion.
According to the question, the given values are :
Mass, m = 150 gram or,
m = 150 /1000 = 0.15 kg and,
Velocity, v = 100 m/s.
As we know that the kinetic Energy = 1/2 mv²
K.E = 1/2 (0.15)(100)²
K.E = 1/2 (1500)
K.E = 750 J.
Hence, the kinetic energy will be 750 J.
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