Answer:
The magnitude of the radial acceleration is 0.754 rad/s²
Explanation:
Given;
radius of the flywheel, r = 0.2 m
initial angular velocity of the flywheel, [tex]\omega_i = 0[/tex]
angular acceleration of the flywheel, a = 0.900 rad/s².
angular distance, θ = 120⁰
the angular distance in radian = [tex]\frac{120}{180} \pi = \frac{2 \pi}{3} \ rad[/tex]
Apply the following kinematic equation to determine the final angular velocity;
[tex]\omega _f^2 = \omega _i ^2 + 2\alpha \theta\\\\\omega _f^2 = 0 + 2(0.9)(\frac{2\pi}{3} )\\\\\omega _f^2 = 3.7699\\\\\omega _f = \sqrt{ 3.7699} \\\\ \omega _f = 1.942 \ rad/s[/tex]
The magnitude of the radial acceleration is calculated as;
[tex]\alpha _r = \omega ^2r\\\\\alpha _r = (1.942)^2 (0.2)\\\\\alpha _r =0.754 \ rad/s^2[/tex]
Therefore, the magnitude of the radial acceleration is 0.754 rad/s²
Wave A is being decreased in temperature, and Wave B is moving from a liquid to a gas
medium
6. Which statement can be made about both waves? (1 point)
They will speed up.
They will increase the density of their medium.
They will slow down.
They will decrease the density of their medium.
Answer:
They will speed up, and decrease in density.
Explanation:
This is because, when water is heated, the molecules will spread apart, and bounce off each other. It gives them more space, and they are less tight packed, so it can move around freely.
a block is suspended 5 m above the ground if the block has a mass of 20 kg how much potential energy is stored in the block (g= 9.8 PE= m*g*h
Answer:
P.E = 980 Joules
Explanation:
Given the following data;
Mass = 20 kg
Height = 5m
Acceleration due to gravity = 9.8 m/s²
To find the potential energy stored in the block;
Mathematically, potential energy is given by the formula;
[tex] P.E = mgh[/tex]
Where,
P.E represents potential energy measured in Joules.
m represents the mass of an object.
g represents acceleration due to gravity measured in meters per seconds square.
h represents the height measured in meters.
Substituting into the equation, we have;
[tex] P.E = 20 * 9.8 * 5 [/tex]
P.E = 980 Joules
Which statement is true about the part of the electromagnetic spectrum that human eyes can detect?
It contains ultraviolet, visible, and infrared light.
It is divided into nine ranges of wavelengths.
It is divided into seven ranges of wavelengths.
It contains only the colors of the rainbow and television waves.
Answer:
A. it contains ultraviolet, visible, and infrared light
Answer:
It is divided into seven ranges of wavelengths
Explanation:
i took the test
What is the purpose of a tuner in a radio?
Answer:
A tuner is a subsystem that receives radio frequency (RF) transmissions and converts the selected carrier frequency and its associated bandwidth into a fixed frequency that is suitable for further processing, usually because a lower frequency is used on the output.
hope it helps ya mate.
Answer:
The tuner selects only the signal of a specific frequency and rejects the rest.
Explanation:
pf
1. Which of the following statement is correct?
A. You should panic when earthquake hits.
B. You should run while the earthquake is going on,
C. You should not follow what the proper authorities will tell you.
D. You should prepare an emergency plan to cope with the disaster.
2. What should you do during an earthquake?
A. You should run out of the house.
B. You should duck, cover, and hold.
C. You should panic and stay only inside the house.
D. You should lock your door so that nobody can enter,
Answer:
1.
D. You should prepare an emergency plan to cope with the disaster.
2.
B. You should duck, cover, and hold.
Explanation:
Because Panic and stress are the main reasons that make the situation worse during natural disasters. Disasters are aggravated when people add chaos to the equation. It's important not to panic during an earthquake. You must maintain a rational state of mind so that you don't do something regretful out of fear.
A. You should panic when earthquake hits. ❌
B. You should run while the earthquake is going on. ❌
C. You should not follow what the proper authorities will tell you. ❌
[tex]\sf\purple{D.\:You \:should \:prepare\: an \:emergency \:plan\: to \:cope\: with\: the\: disaster. }[/tex]✅
........................................................................
2. What should you do during an earthquake?A. You should run out of the house. ❌
[tex]\sf\pink{B.\:You\: should \:duck,\: cover, \:and \:hold.}[/tex] ✅
C. You should panic and stay only inside the house. ❌
D. You should lock your door so that nobody can enter. ❌
........................................................................
[tex]\circ \: \: { \underline{ \boxed{ \sf{ \color{green}{Happy\:learning.}}}}}∘[/tex]
what is in the centre of gravity
Answer:
The centre of gravity (COG) of the human body is a hypothetical point around which the force of gravity appears to act. It is a point at which the combined mass of the body appears to be concentrated.
The centre of gravity (COG) of an object is the point at which weight is evenly dispersed and all sides are in balance. A human's centre of gravity can change as he takes on different positions, but in many other objects, it's a fixed location.
Blackbody radition is white give reasons.?
Answer:An object that absorbs ALL radiation falling on it, at all wavelengths, is called a blackbody. When a blackbody is at a uniform temperature, its emission has a characteristic frequency distribution that depends on the temperature. ... As its temperature increases further it becomes yellow, white, and ultimately blue-white
Explanation:
PLEASE HELP ASAP!!!!
Answer:
it's frequency
Explanation:
hope this helps :)
Answer:
its probably its frequency
Explanation:
-
What is the frequency of a 5 m wave traveling at the speed of 200 m/s
Explanation:
f=v/wavelength
=200/5
=40Hz
Every household has at least one refrigerator, many hotels have ice makers. you may have wondered how much heat energy a refrigerator / ice maker takes
from water to make ice. Compute the amount of energy an
ice maker extracts from 200g of water at 34°c to manufacture ice at 0°c.
Answer:
1.heading
2.photo
3.boldface text
4.caption
5.bulleted list
Explanation:
you welcome
what do you mean by wave
optics
Answer:
hope it helps.
stay safe healthy and happy.explain the reason why water wet glass why Mercury does not
Answer:
Mercury does not wet the glass because the cohesive force with the drops is stronger than the adhesive force between the drops and glass.
...https://www.toppr.com › ask › en-us › question › merc..
Explanation:
A wave is moving toward shore with a velocity of 15.0 m/s. If its frequency is 9.3 hertz, what is its wavelength?
Explanation:
[tex]V = f \lambda \\ 15.0 = 9.3 \lambda \\ \lambda = \frac{15}{9.3} \\ \lambda = 1.61 \: m[/tex]
Calculate the number of moles of water molecules in 12 dm' of water
vapour at STP.
Answer:
[tex]22.4 \: {dm}^{3} \: are \: occupied \: by \: 1 \: mole \\ 12 \: {dm}^{3} \: will \: be \: occupied \: by \: ( \frac{12}{22.4} ) \: moles \\ = 0.536 \: moles[/tex]
Number of moles of water molecules in 12 dm^3 of water =667 moles
What is mole ?A mole is defined as the amount of a substance that contain exactly 6.022 * 10 ^23 elementary entities of the given substance
1 dm ^3 = 1 L
12 dm^3 = 12 L
density of water = mass / volume
mass = 1000kg/m^3 * 0.012 m^3
mass = 12 kg = 12 * 10 ^ 3 g
moles = mass / molar mass
moles = 12 * 10 ^ (3 ) g / 18 g/mole
= 0.667 *10 ^ (3 )
= 667 moles
Number of moles of water molecules in 12 dm^3 of water =667 moles
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PLEASE HELP ME ASAP!!!!
Answer:
otinni oSame lage ta dili pud ko ka comment sa live Ni madamstin
Answer:
it can be used to locate underwater objects
A ball is dropped freely from the top of a ten-floor building in which each floor is measured to be 2 m. Then the velocity of the ball at which it would hit the ground is ?
Answer:
19.80 m/s
Explanation:
From the question given above, the following data were obtained:
Height of each floor = 2 m
Total Height (h) = 2 × 10 = 20 m
Initial velocity (u) = 0 m/s
Acceleration due to gravity (g) = 9.8 m/s²
Final velocity (v) =?
The velocity at which the ball will hit the ground can be obtained as follow:
v² = u² + 2gh
v² = 0² + (2 × 9.8 × 20)
v² = 0 + 392
v² = 392
Take the square root of both side
v = √392
v = 19.80 m/s
Thus, the ball will hit the ground with a velocity of 19.80 m/s
A neutral metal can is mounted on a foam stand. A positively
charged balloon is brought near. The can is touched on the
opposite side.
Answer:
Negative
Positive
Explanation:
When a positive charge balloon is brought near the neutral metal can, the positive charge in the ballon, delocalization and arrangement of like charges occurs. The positive charge then flow to the an end while the negative charges flows to the other end.
Thus, after being touched, the charge on the can is negative.
And, If not touched, the charge on the ballon remains positive.
After being touched, the charge on the can is negative and the charge on the balloon is positive.
What is charging by friction?When the two materials are rubbed each other, then the electric charged generated between them.
This charging of materials due to the rubbing or two materials against each other, is called the charging by friction.
This force of attraction or repulsion is identified by the sign of the particular charge. According to the property of interacting charges-
Like charges-For the like charges, when two charges same charges (positive-positive or negative -negative) interact to each other, then the charges repel each other.Unlike charges-For the unlike charges, when two charges interact to each other, then the charges attract each other.Here, the neutral metal can is mounted on a foam stand. A positively charged balloon is brought near. The can is touched on the opposite side.
The positive charge on the balloon, make it to lose the electron. By this, the balloon become positively charged.
The atom on the opposite side have an excess of electron. Thus, the can become negatively charged.
Hence, after being touched, the charge on the can is negative and the charge on the balloon is positive.
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The nuclear reactions inside a star, such as our
sun, convert hydrogen into helium by means of a
process
known as?
Answer:
fusion
Explanation:
The nuclear reactions inside convert hydrogen into helium by means of a process known as fusion. It is this nuclear reaction that gives a star its energy. Fusion takes place when the nuclei of hydrogen atoms with one proton each fuse together to form helium atoms with two protons.
How far an object moves from a reference point is known as
type your answer...
Answer:
distance
hope it helps
Explanation:
-
A force of 20 N acts on a smaller piston of a hydraulic press with an area of 10 dm2. How much force does the liquid act on a larger piston of 120 cm2?
Answer:
166.67 N
Explanation:
Applying Pascal's principle,
Presure in the smaller piston(P') = Pressure in the bigger piston(P)
But,
Pressure = Force/Area
Pressure in the smaller piston(P') = Force applied to the smaller piston(F')/Area of the smaller piston(A')
Pressure in the bigger piston(P) = Force applied to the bigger piston(F)/Area of the bigger piston(A)
F'/A' = F/A.................. Equation 1
Make F the subject of the equation
F = F'A/A'.............. Equation 2
From the question,
Given: F' = 20 N, A = 120 cm², A' = 10 dm² = (10×100) = 1000 cm²
Substitute these values into equation 2
F = 20(1000)/120
F = 166.67 N
Three swimmers who all swim at the same speed discuss how to cross a river in the shortest amount of time. Swimmer A will swim straight across the river at a right angle to the current. Swimmer B reasons that the current will carry A downstream, meaning that A will cover a greater distance to get across and therefore will take a longer time interval. B says he will aim at an upstream angle such that, allowing for the current, he will reach the other side directly across from where he starts, thus covering the shortest distance and arriving first. Swimmer C, reasoning that the time interval needed for B to cross will be longer than B expects because some of B’s effort will be spent battling the current, plans to aim at a downstream angle, so that the current assists rather than opposes him. This way he will be traveling at the highest speed and get across first. Which swimmer gets across first?
Answer:
Swimmer A
Explanation:
The time required for a swimmer to cross a river is equal to the width of the river which is divided by the magnitude of the component of the velocity which is parallel to the width of the river.
In the given context, all the three swimmers A, B and C swims in a different angle relative to the direction of the flow of river. The swimmer A swims straight at a direction perpendicular to the direction of current of the river across the width of the river, so A will have the largest velocity component which is parallel to the width of the river. So the time taken by swimmer A will be the least to cross the river.
May
SHOW YOUR WORK IN ALL QUESTIONS. Acceleration due to gravity: a = 9.81 m/s2
1.) (a) A ball is dropped from 4 meters above the ground. If it begins at rest, how long does it take
to hit the ground?
(b) A ball is thrown upward at 4 meters per second starting from ground level. How long does it
take for the ball to return to the ground?
(c) If a ball that is 4 meters above the ground is thrown horizontally at 4 meters per second,
how long will it take for the ball to hit the ground?
(d) In question (c) above, how far will the ball travel in the horizontal direction before it hits th
ground?
(e) Drop a ball from a height of 2 meters and, using a stopwatch, record the time it takes to
reach the ground. Repeat this two more times and record all the times in the table belov-
then find the average time. Be sure to release the ball from rest rather than throwing it
or down.
Test Number
Time (seconds)
Answer:
a) t = 0.90 s, b) t = 0.815 s, c) t = 0.90 s, d) x = 3.6 m, e) t = 0.639 s
Explanation:
all these exercises are about kinematics
a) The body is released from rest,
y = y₀ + v₀ t - ½ g t²
in this case when reaching the ground y = 0 and its initial velocity is vo = 0
0 = y₀ + 0 - ½ g t²
t² = 2 y₀ / g
t² = 2 4 /9.81
t² = 0.815
t = √0.815
t = 0.90 s
b) It is thrown upwards at v₀ = 4 m / s
y = y₀ + v₀ t - ½ g t²
in this case the initial and final height is the same
y = y₀ = 0
0 = v₀ t -1/2 g t²
t = 2 v₀ / g
t = 2 4 /9.81
t = 0.815 s
c) the ball is at y₀ = 4 m and its initial velocity is horizontal v₀ = 4 m / s
y = y₀ + v_{oy} t - ½ g t²
0 = y₀ + 0 - ½ g t²
t² = 2 i / g
t² = 2 4 / 9.81
t² = 0.815
t = 0.90 s
d) the horizontal distance traveled is
x = v₀ₓ t
x = 4 0.90
x = 3.6 m
e) We can calculate the time to fall from I = 2 m
y = y₀ + v_{oy} t - ½ g t²
0 = y₀ + 0 - ½ g t²
t² = 2 y₀i / g
t² = 2 2 /9.81
t² = 0.4077
t = 0.639 s
Therefore, when making measurements, you should find readings around this value.
Box A has a mass of 35.0kg and Box B has a mass of 20.0kg. What is the tension on Box A if the acceleration of the system is -2.67m/s2 clockwise?
A. 250.N
B. 686N
C. 436N
D. 392N
Answer:
B. 686N
Explanation:
well do not write this because of I made a big mistake in my calculations
The tension on Box A if the acceleration of the system is provided clockwise is 686N.
What is tension?The tension is the force of pulling in the linear objects.
Given is the system of two masses hung over a pulley with a string. Mass of block A, M(A) =35kg, M(B) = 20kg and the acceleration clockwise a =-2.67 m/s²
The tension in the string of each block = T =m(g-a)
Substitute the values, we get
T = 35 x (9.81-(-2.67)) +20(9.81 +2.67)
T =436.8 N + 249.6
T = 686.4 N
Thus, the tension in the the block A will be approximately 686N.
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I want the answer and that’s all
Answer:
Cuboid?
Explanation:
State the role of an electromotive force (EFF) in a current flow
Answer:
The emf source acts as a charge pump, moving negative charges from the positive terminal to the negative terminal to maintain the potential difference. This increases the potential energy of the charges and, therefore, the electric potential of the charges.
Explanation:
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A 1,700 kg car is accelerated at 2.8 m/s? What force was needed to produce this acceleration?
Answer:
[tex]4,760\:\mathrm{N}[/tex]
Explanation:
From Newton's 2nd Law, we have [tex]\Sigma F=ma[/tex]. Substituting given values, we get:
[tex]F=1700\cdot 2.8,F=\boxed{4,760\:\mathrm{N}}[/tex]
A 20" round duct is 275' in length. The duct is carrying 2,900 CFM at a friction loss of 0.12 inches WG per 100 feet.
What is the total friction loss through the duct?
.An object weighing 5kg is dropped from a height of 25m. Find the:
a.potential energy and its kinetic energy at the instant it is dropped.
b.potential energy and its kinetic energy at the time it is 15m high.
c.velocity when it is 15m high.
d.height when velocity is 12 m/s.
e.potential energy and its kinetic energy at the time it strikes the ground.
f.velocity with which it hits the ground.
Answer:
f
Explanation:
a. The potential energy and its kinetic energy at the instant it is dropped will be 1126.25 J and 0 J respectively.
b. The potential energy and its kinetic energy at the time it is 15m high will be 735.75 J and 390.25 J respectively.
c. The velocity when it is 15m high will be 156.1 m/sec.
d. The height when velocity is 12 m/s will be 15.62 m
e. The potential energy and its kinetic energy at the time it strikes the ground will be 0 J and 1126.25 J respectively
f. The velocity with which it hits the ground will be 21.22 m/sec.
What is kinetic energy?The energy of the body by the virtue of its motion is known as the kinetic energy of the body. It is defined as the product of half of mass and square of the velocity.
According to the law of conservation of energy, the total energy is defined as the sum of kinetic energy and potential energy.
Total energy = kinetic energy+potential energy
Also, the energy can not be created nor be destroyed can be transferred from one form to another form.
Kinetic energy is due to the position.While the kinetic energy is due to the velocity.
a)The potential energy and its kinetic energy at the instant it is dropped.
[tex]\rm PE_{drop}=mgh \\\\\ PE_{drop}=5 \times 9.81 \times 25 \\\\ PE_{drop}=1126.25 \ J[/tex]
[tex]\rm KE_{drop}=\frac{1}{2} mv^2 \\\\ v= 0 \\\\ KE_{drop}=0 \ J[/tex]
TE= 1126.25+0
TE= 1126.25+0
b. Potential energy and its kinetic energy at the time it is 15m high.
[tex]\rm PE_{15}=mgh \\\\ \rm PE_{15}= 5 \times 9.81 \times 15 \\\\ PE_{15}=735.75 \ J[/tex]
TE=KE+PE
1126.25=KE+735.75
KE=390.25
c) Velocity when it is 15m high
[tex]\rm KE=390.25\\\\ 390.25=\frac{1}{2} \times 5 \times v_{15}^2 \\\\ v_{15}=156.1\ m/sec[/tex]
d. Height when velocity is 12 m/s.
[tex]\rm KE = \frac{1}{2}mv^2 \\\\\ KE =\frac{1}{2} \times 5 \times (12)^2 \\\\ KE=360\ J[/tex]
TE=KE+PE
1126.25=360+PE
PE=766.25
PE=766.25
mgh=766.25
5 ×9.81 ×h=766.25
h=15.62 m
E. Potential energy and its Kinetic energy at the time it strikes the ground.
[tex]\rm PE_{ground}=0 \ J[/tex]
TE=KE+PE
TE=KE+0
TE=KE
TE= 1126.25
KE=1126.25 J
f. Velocity with which it hits the ground.
[tex]\rm KE_{ground}=1126.25 J \\\\ \frac{1}{2} mv^2=1126.25\\\\ v^2 = 450 \\\\ v= 21.22 \ m/sec[/tex]
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What is the Faraday's Law all about?
Answer:
It is a Basic law of electromagnism.
Explanation:
Hope this helps! Please make this Brainliest lol
PLEASE HELP ASAP!!!
Answer:
Its the third option is correct according to me.