Answer:
c
Explanation:
Is a man kicking ball potential or kinetic?
A child is sitting on the outer edge of a merry-go-round that is 18 m in diameter. If the merry-go-round makes 4.9 rev/min, what is the velocity of the child in m/s?
a.
9.2 m/s
b.
4.6 m/s
c.
0.74 m/s
d.
1.75 m/s
Answer:
b. 4.6 m/sExplanation:
the formula for calculating the linear velocity is expressed as;
v = wr
w is the angular velocity
r is the radius
r = d/2 = 18/2
r = 9 m
Given that 1rev/min = 0.10472rad/s
4.9 rev/min = x
x = 4.9 * 0.10472
x = 0.513128 rad/s
Substitute into the given formula;
v = 9 * 0.513128
V = 4.61m/s
Hence the velocity of the child in m/s is 4.6m/s
A rock of mass 0.340 kg is spun horizontally at the end of a wire that has a diameter of 1.00 mm. If the wire gets stretched by 2.00 mm when the rock moves at a speed of 19.0 m/s, what is the Young's modulus of the wire?
Answer:
Y = 78.13 x 10⁹ Pa = 78.13 GPa
Explanation:
First we will find the centripetal force acting on the wire as follows:
F = mv²/r
where,
F = Force = ?
m = mass of rock = 0.34 kg
v = speed = 19 m/s
r = length of wire
Therefore,
F = (0.34)(19)²/r
F = 122.74/r
now, we find cross-sectional area of wire:
A = πd²/4
where,
A = Area = ?
d = diameter of wire = 1 mm = 0.001 m
Therefore,
A = π(0.001)²/4
A = 7.85 x 10⁻⁷ m²
Now, we calculate the stress on wire:
Stress = F/A
Stress = (122.74/r)/(7.85 x 10⁻⁷)
Stress = 1.56 x 10⁸/r
Now, we calculate strain:
Strain = Δr/r
where,
Δr = stretch in length = 2 mm = 0.002 m
Therefore,
Strain = 0.002/r
now, for Young's modulus (Y):
Y = Stress/Strain
Y = (1.56 x 10⁸/r)/(0.002/r)
Y = 78.13 x 10⁹ Pa = 78.13 GPa
Calculate the height from which a body is released from rest if its velocity just before hitting the ground is 30 meter per seconds?
Explanation:
u = 0m/s
v = 30m/s
a = g = 10m/s²
s = H = ?
using the formula,
v² = u² + 2as
30² = 0² + 2(10)(H)
900 = 20H
H = 900/20
H = 45m
Answer:
the answer is
45m - height
What is the index of refraction of a material for which the wavelength of light is 0.671 times its value in a vacuum
Explanation:
We need to find the index of refraction of a material for which the wavelength of light is 0.671 times its value in a vacuum.
The wavelength in any medium is given by :
[tex]\lambda_m=\dfrac{\lambda}{n}[/tex]
Where, [tex]\lambda[/tex] is wavelength in vacuum and n is refractive index of the medium.
[tex]n=\dfrac{\lambda}{\lambda_m}\\\\n=\dfrac{\lambda}{0.671\lambda}\\\\=\dfrac{1}{0.671}\\\\=1.49[/tex]
So, the medium can be PMMA (acrylic, plexiglas, lucite, perspex) which have a refractive index of 1.49.
The index of refraction of the material for which the wavelength of light is 0.671 times, the value of it in a vacuum is 1.49.
What is the index of refraction of a material?The index of refraction of a material is the ratio of wavelength of the wave in vacuum to the wavelength of the wave in the given medium.
The index of refraction is inversely proportional to the wavelength. It can be find out using the following formula.
[tex]n=\dfrac{\lambda}{\lambda_m}[/tex]
Here, (λ) is the wavelength in vacuum and (λm) is the wavelength in a medium.
The index of refraction of a material for which the wavelength of light is 0.671 times its value in a vacuum (0.671×λ).
Plug in the values in the above formula,
[tex]n=\dfrac{\lambda}{0.671\times\lambda}\\n=1.49[/tex]
Thus, the index of refraction of the material for which the wavelength of light is 0.671 times, the value of it in a vacuum is 1.49.
Learn more about the index of refraction here;
https://brainly.com/question/10729741
A cannonball is launched horizontally with an initial speed of 48.0m/s. Determine
all unknowns.
m/s
initial speed:
initial horizontal speed:
initial vertical speed:
A/s
m/s
A
• initial speed: 48.0 m/s
The cannonball is shot horizontally, so
• initial horizontal speed: 48.0 m/s
• initial vertical speed: 0
Some nitrogen at 80.0 psi gauge pressure occupies 13.0 ft^3. Find its volume, in ft^3, at 50.0 psi gauge pressure.
Answer:
20.8 ft³
Explanation:
The following data were obtained from the question:
Initial pressure (P1) = 80 psi
Initial volume (V1) = 13 ft³
Final pressure (P2) = 50 psi
Final volume (V2) =?
The new volume of the gas can be obtained by using the Boyle's law equation as shown below:
P1V1 = P2V2
80 × 13 = 50 × V2
1040 = 50 × V2
Divide both side by 50
V2 = 1040 / 50
V2 = 20.8 ft³
Thus, the volume of the gas at a pressure of 50 psi is 20.8 ft³
A student walks 4 block east, 7 blocks west, 1 blocks east then 2 blocks west in an hour her average speed is____ block/hour
Answer:
2 m/s
Explanation:
The total time = 1 hour
The vertical displacement = 1 - 1
Vertical displacement = 0
Horizontal displacement = 4 - 2
Horizontal displacement = 2
Total displacement = sqrt (2^2 - 0^2)
Displacement - 2
Average velocity is displacement/time
= 2x1
= 2 m/s
The average velocity is 2 metres per second.
Question #2
Like liquids, are gases made of particles?
Yes
No
Maybe
Answer:
Yes
Explanation:
Answer:
YesExplanation:
Remember that all solids, liquids, and gases are made up of atoms, molecules, and / or ions. ( Also remember that the answer "maybe" most likely won't be the answer in most quizzes. )
Which answers your question, gases are made up of particles.
Hope this helps! <3
Is a light bulb that is on potential or kinetic?
Answer:
pretty sure its kinetic
Explanation:
Answer:
Kinetic
Explanation:
The stored chemical potential energy of a battery converts to electrical kinetic energy to transport electricity to a light bulb, which radiates thermal kinetic energy.
A car traveling at point k the car travels south for 8.0 km it then travels west for 5.0 km next it travels for 4,0 what is the total displacement of the car
What is this?
Explanation:
Average formula is...?
Answer:
total sum of all numbers/ number of items in the set
Explanation:
A stone sphere of radius 7.00 m rests in a flat field. Relative to the ground, what is the gravitational potential energy of a 90.0-kg person sitting on the very top of the sphere?
a. 7.76 x 104 J
b. 1.23 x 104 J
c. 3.88 x 104 J
Answer:
(B) 1.23 x 10⁴ J
Explanation:
Given;
radius of the sphere, r = 7.0 m
diameter of the sphere, d = 2r = 14.0 m
mass of the person sitting on the sphere, m = 90.0 kg
The gravitational potential energy of the person is given by;
P.E = mgh
where;
g is acceleration due to gravity = 9.8 m/s²
h is the height above the ground level = d = 14.0 m
P.E = mgh
P.E = (90)(9.8)(14)
P.E = 12348 J
P.E = 1.2348 x 10⁴ J
Therefore, the gravitational potential energy of the person is 1.2348 x 10⁴ J
The mass of Jupiter is 0.001 solar mass. The orbital period of Jupiter is 11.9 Earth years.
What is the distance between Jupiter and the Sun?
5.2 AU
41 AU
52 AU
410 AU
Answer:
The distance between Jupiter and the Sun is 5.2 AU.
The answer would be A: 5.2 Au away from the sun (AU is the unit that is the same length as the distance between Earth and the Sun)
WILL MARK BRAINLIEST -- The Earth’s velocity is shown by a red vector. Which best describes the Earth’s velocity?
a. It is constant in magnitude and direction
b. It is constant in magnitude but not constant in direction
c. It is not constant in magnitude but is constant in direction
d. It is not constant in magnitude or direction
big ideas
key questions and terms notes
Answer:
what i and confused
Explanation:
Answer:
nerd
Explanation:
I H4+3 U
The chemists'_
is another name for the periodic table.
Answer here
Answer: Calendar
Explanation: I'm pretty sure it is calendar.
how many significant figures are in 46 m?
Why is science important for society? (2 points)
a
It helps make decisions based on scientific reasoning.
b
It proves that all questions can be answered using science.
c
It emphasizes the importance of human choice in decision making.
d
It shows that all social problems can be solved using scientific knowledge.
Answer:
i think its d
Explanation:
i took this quiz and got 100 percent
A mass M is attached to a spring with spring constant k. When this system is set in motion with amplitude A, it has a period T. What is the period if the mass is doubled to 2M
Answer:
T' = o.707T
Explanation:
[tex]T = 1/2\pi \sqrt{k/m} \\\\m'=2m then\\T' = 1/2\pi \sqrt{k/m'}\\ = 1/2\pi \sqrt{k/2m}\\T' = \frac{(1/2\pi \sqrt{k/m}\\)}{1.4} T' = \frac{T}{1.4}\\T' = 0.707T[/tex]
Scientists from NASA discovered a Nebula with doubled the mass as the Nebula from which our Solar System formed. Explain the similarities and differences between the Solar System that will form from that Nebula and our Solar System. (Note: your response must include a discussion of gravity.)
Answer:
it forms another one
Explanation:
our solar system was formed by a nebula so that nebula is supposed to form another one
what are some possible results of constructive forces on earth's surface
Answer:
what are the choices
Explanation:
Answer:
Landforms are a result of a combination of constructive and destructive forces. Collection and analysis of data indicates that constructive forces include crustal deformation, faulting, volcanic eruption and deposition of sediment, while destructive forces include weathering and erosion.
Explanation:
Scientists monitoring and predicting future volcanic eruptions can givr people living near Mt/ St. Helens prior warning so that they can take action. What additional measures could help reduce the negative impacts of a future eruption?
Answer:
first thing first they really have to concern about this,
and second one is people should leave those hazardous places
Answer:
-Emergency evacuation roadways could be designed.
-An Evacuation plan could be organized.
-Warning Sirens could be designed.
Explanation:
Those 3 are the answer.
Is a bow and arrow by themselves potential or kinetic?
Answer:
Potential energy
Explanation:
When the string is released, the potential energy is converted to kinetic energy in the movement of the arrow. The string pushes the arrow out and is the driving force behind the motion.
What is the critical angle for light traveling from crown glass (n = 1.52) into water (n = 1.33)?
42 degrees
48 degrees
57 degrees
61 degrees
Answer:
61 degrees, I just did the test.
Explanation:
Answer: 61 degrees
Explanation:
I just did the question and got it right
Suppose we wish to use a 8.0 m iron bar to lift a heavy object by using it as a lever. If we place the pivot point at a distance of 1.0 m from the end of the bar that is in contact with the load and we can exert a downward force of 562 N on the other end of the bar, find the maximum load that this person is able to lift (pry) using this arrangement (neglect the mass of the bar in this problem).
Answer:
W = 3934 N , m = 401.43 kg
Explanation:
This problem can be solved using the rotational equilibrium relation, where we place the reference system at the pivot point and assume that the counterclockwise turns are positive.
∑τ = 0
F 7 - W 1 = 0
W = F 7/1
W = 562 7
W = 3934 N
W = mg
m = W / g
m = 3934 / 9.8
m = 401.43 kg
2. What are the three phases of water?
solid, liquid, gas
conduction, convection, radiation
high, medium, low
positive, negative, neutral
Answer:
solid, liquid, gas
Explanation:
The three phases of water are the three states of matter water can be found in, and that is:
solid (as in ice)
liquid (as in water)
gas (as in water vapor)
Red light of wavelength 633 nmnm from a helium-neon laser passes through a slit 0.400 mmmm wide. The diffraction pattern is observed on a screen 2.90 mm away. Define the width of a bright fringe as the distance between the minima on either side.
Required:
a. What is the width of the central bright fringe?
b. What is the width of the first bright fringe on either side of the central one?
Answer:
a
[tex]y_1 = 0.004589 \ m[/tex]
b
[tex]y_2 =0.009179 \ m[/tex]
Explanation:
From the question we are told that
The wavelength of the red light is [tex]\lambda _r = 633 \ nm = 633 *10^{-9} \ m[/tex]
The width of the slit is [tex]d = 0.40 mm = 0.40 *10^{-3} \ m[/tex]
The distance of the screen from the point of diffraction is [tex]D = 2.9 \ m[/tex]
Generally the width of the central bright fringe is mathematically represented as
[tex]y_1 = \frac{\lambda * D}{d}[/tex]
=> [tex]y_1 = \frac{633 *10^{-9} * 2.90 }{0.40 *10^{-3}}[/tex]
=> [tex]y_1 = 0.004589 \ m[/tex]
Generally the width of the first bright fringe on either side of the central one is mathematically represented as
[tex]y_2 = 2 * y_1[/tex]
=> [tex]y_2 = 2 * 0.004589[/tex]
=> [tex]y_2 =0.009179 \ m[/tex]
A laser (electromagnetic wave) has the maximum electric field strength of 1.0x1011 V/m. What is the force the laser applies on a mirror (totally reflective) of 5.0 mm2 area? A. 2.76 x105N B. 1.21 x106N C. 1.94 x106N D.4.43 x105 N E. 7.82 x104N
Answer:
The correct option is D
Explanation:
From the question we are told that
The maximum electric field strength is [tex]E = 1.0 *10^{11} \ V/m[/tex]
The area is [tex]A = 5.0 \ mm^2 = 5.0 *10^{-6} \ m^2[/tex]
Generally the force the laser applies is mathematically represented as
[tex]F = \epsilon_o * E ^2 * A[/tex]
Here [tex]\epsilon_o = 8.85*10^{-12} C/(V \cdot m)[/tex]
[tex]F = 8.85*10^{-12} * (1.0 *10^{11}) ^2 * 5.00*10^{-6 }[/tex]
=> [tex]F = 4.43 *10^{5} \ N[/tex]
PLEASE HELP!
A Cadillac Escalade car and a Mini Cooper car are both making a sharp right turn. The Escalade is four times more massive than the Mini Cooper. If both cars make the turn with the same constant speed, how do the centripetal forces acting on the two cars compare? Hint: use the Fc equation to consider how increasing the mass will affect the force.
The centripetal force cannot be determined without more information.
The centripetal force on the Mini Cooper is four times greater than that of the Cadillac Escalade.
The centripetal force on the Cadillac Escalade is four times greater than that of the Mini Cooper.
The centripetal force is the same for both cars.