The magnitude of the angular acceleration of the magnetic disk is determined as 35 rad/s².
Angular acceleration of the disk
The angular acceleration of the disk is determined from the principle of conservation of angular momentum as follows;
τ = Iα
where;
α is angular acceleration
I is moment of inertia of the disk
I = 0.5MR²
I = 0.5 x 0.2 x 2²
I = 0.4 kgm²
τ = Iα
α = τ/I
α = (14)/(0.4)
α = 35 rad/s²
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A ball thrown vertically upwards from ground
level hits the ground after 4 s. Calculate the
maximum height it reached during its journey.
(SC/GCE)
parabolic motion
[tex]\tt t_{max}=\dfrac{2u~sin~\alpha }{g}[/tex]
[tex]\tt h_{max}=\dfrac{u^2sin^2\alpha }{2g}[/tex]
vertically upwards ⇒ α = 90°⇒sin 90° = 1
[tex]\tt 4=\dfrac{2u}{10}\rightarrow u=20~m/s[/tex]
[tex]\tt h_{max}=\dfrac{20^2}{2.10}=\boxed{\bold{20~m}}[/tex]
When discussing Newton’s laws of motion, which terms do people most likely use when talking about Newton’s third law of motion?
“force” and “acceleration”
“inertia” and “force”
“action” and “reaction”
“mass” and “inertia”
Answer:
action and reaction
Explanation:
becase it state that"to every action there is always an equal and opposite reaction"
The F-35B Lightning II is a short-takeoff and vertical landing fighter jet. If it does a vertical takeoff to 20.00-m height above the ground and then follows a flight path angled at 26o with respect to the ground for 25 km, what is the final displacement in meters
The final displacement of the F-35B Lightning fighter jet is determined as 24,991.2 m.
Displacement of the flight
The displacement of the flight is calculated from triangle method of vector addition as follows;
Let the vertical take off = first length of triangleLet the flight path at 26⁰ = second length of triangleLet the displacement = third side of triangleAngle between the first two sides = 90 - 26⁰ = 64⁰
r² = a² + b² - 2abcosR
r² = 20² + 25000² - (2 x 20 x 25000) x cos(64)
r² = 624,562,028.9
r = 24,991.2 m
Thus, the final displacement of the F-35B Lightning fighter jet is determined as 24,991.2 m.
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a 4kg box is resting on top of a shelf that is 2m high, what is the boxs gravitational potential relative to the floor
Answer:
80 J
Explanation:
PE = mgh
PE = (4 kg)(9.8 m/s^2)(2 m)
PE = 78.4 J and with sig figs, it would be 80 J
Nina and ryan each ran at a constant speed for a 100-meter race. Each runner’s distance for the same section of the race is displayed on the left. Who had a head start, and how big was the head start?.
"Nina and Ryan each ran at a constant speed for a 100-meter race. Each runner’s distance for the same section of the race is displayed on the left." In the event of things, Ryan had a headstart of 10min. This is further explained below.
What is headstart?Generally, headstart is simply defined as a head start is a benefit received or awarded from the outset.
In conclusion, "When racing 100 meters, both Nina and Ryan maintained a steady pace. On the left is a chart showing the distance covered by each runner during the same segment of the race." Whatever the case may be, Ryan was given a 10-minute head start.
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Answer: Ryan had a head start of 10 meters.
Explanation: Trust me
What stands in for a "creator" in scientists view of the universe?
*
1 point
The laws of physics
The "Big Bang"
String Theory
Humans create the universe
In scientists view of the universe The creator is replace by: (B). The "Big Bang"
Meaning of Big Bang
The Big bang is a theory propagated by scientist and astronomers to replace the creator.
The Big Bang is said to be a reason for the universe and all the planets in it. Scientist say the universe started as just a single point with very high temperature and density, and then here comes the big bang.
In conclusion, In scientists view of the universe The creator is replace by: The "Big Bang"
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Calculate the energy used by a radio of power 30W in 1 minute.
Answer:
1800 j or 1.8 kj
Explanation:
Energy used = power (measured in watts) multiplied by time (measured by seconds)
1 minute is 60 seconds
30 multiplied by 60 is 1800
Answer:
1800 joule
Explanation:
Power (P) = 30W
Time (T) = 1 min =60 sec
P =(W/T)
30 = W / 60
W = 1800 joule
We know that Energy Is equivalent to Work done. So Energy used is 1800 joule.
Why is work measured in
Newton-Meters (NM)?
A. Newton invented work.
B. The equation for work consists of one factor.
C. The equation for work consists of two factors.
D. Newton discovered work.
Answer:
C) the equation consists of two factors:
work = force * distance
W = F · S
Why is it not possible to achieve a higher resolution in the light microscope?.
Explanation:
Because resolution of the light microscope cannot be small than the half of the wavelength of the visible light
25. IF THE ROADWAY IS WET AND THE CAR STARTS TO SKID, YOU SHOULD: A. Slow down by pumping the brakes quickly and firmly B. Slow down by shifting to a lower gear C. Slowly ease your foot off the gas pedal
If the roadway is wet and the cars starts to skid, one should slow down by shifting to lower gear. The correct option is B.
What are gears?A gear is component used to transmit motion. They are used in cars, trucks, machines, bicycles, etc.
For a car to avoid skidding on the wet roads, one must drive the car slowly. This can be done by shifting the gear to the lower one. This will help car to keep balance when brakes are applied on wet roads.
Thus, the correct option is B.
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How to convert work done in joules into kilojoules?
1 Kilojoule [kJ] = 737.562 149 277 27 Foot pound force [ftlbf]
Answer:
divide by 1000
Explanation:
eg 1kJ is equal to 1000J
if water completely boils in 7 minutes, how long does it take to evaporate
Answer: 20 minutes
Explanation: omm its 20 minutes
How does the amount of energy needed to melt 1 kg of ice at 0°C compare to the
amount of energy needed to change 1 kg of water to steam at 100°C? Base your
answer on the heat of fusion of water and the heat of vaporization of water.
(A) It takes about two-thirds as much energy to boil the water as to melt the ice.
(B) It takes the same amount of energy to boil the water and melt the ice.
(C) It takes about two-thirds as much energy to melt the ice as to boil the water.
(D) It takes more than six times as much energy to boil the water as to melt the
ice.
(A) It takes about two-thirds as much energy to boil the water as to melt the ice.
What are the advantages of using digital signals over analog signals?
Digital signals are advantageous over analog signals because they are easily reproducible and convey information with little interference.
What are analog and digital signal?
Analogs signals are signal which are continuous whereas digital signals are signal which are not continuous but are separated by time.
Use of digital signals are most common because they have certain advantages over analog signals.
Some advantages of digital signals over analog signals include:
Digital signals can convey information with less noise and interference.Digital circuits can be easily reproducedTherefore, Digital signals are advantageous over analog signals because they are easily reproducible and convey information with little interference.
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Water is added to a measuring cylinder containing 100 cm3 of liquid paraffin. (the density of paraffin is 0.80 g/ cm3 and that of the water is 1.0 g / cm3 .) as the water is added, the level of the paraffin rises to 150 cm3 . the paraffin and water do not mix. what finally is the total mass of liquid in the measuring cylinder?
The total of the liquid in the measuring cylinder given the data from the question is 130 g
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
How to determine the mass of paraffin Density of paraffin = 0.80 g/cm³Volume of paraffin = 100 cm³Mass of paraffin =?Mass = Density × Volume
Mass of paraffin = 0.8 × 100
Mass of paraffin = 80 g
How to determine the mass of water Density of water = 1 g/cm³Volume of paraffin = 100 cm³Volume of paraffin + water = 150 cm³Volume of water = 150 – 100 = 50 cm³Mass of water =?Mass = Density × Volume
Mass of water = 1 × 50
Mass of water = 50 g
How to determine the mass of the mixture Mass of water = 50 gMass of paraffin = 80 gMass of mixture =?Mass of mixture = Mass of paraffin + Mass of water
Mass of mixture = 80 + 50
Mass of mixture = 130 g
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1. Predict whether the energy required to remove an electron from magnesium and potassium would be more or less than that required to remove an electron from sodium. Explain your prediction in terms of the forces and interactions involved in this process. \
FILL OUT THE TABLE PLEASE WITH A GOOD ANSWER FOR BRAINLIEST!
In both cases less energy is required
But comparetively Mg require more energy than K
Let's see the electron configuration of Both
[Mg]=1s²2s²2p⁶3s²=[Ne]3s²[K]=1s²2s²2p⁶3s²3p⁶4s¹=[Ar]4s¹K has only one valence electron so very less ionization enthalpy so less energy required
Mg has 2 so more IE hence more energy required
-1 A 4m long wire of cross-sectional area 2.5 X 10 m² has a resistance of 5. The conductivity of the wire is (a) 2.5 X 10' m (b) 4.0 X 10' m (c) 2.5 X 10'' m¹ -1 -1 (d) 4.0 X 10''m'
Answer:
3.2 [tex]10^{-2} ohm^{-1} m^{-1}[/tex]
Explanation:
Resistance=5 ohm
Length=4m
Cross sectional area=2.5 x 10
Conductivity = 1/ resistivity
=[tex]\frac{length}{resistance x cross sectional area}[/tex]
Conductivity=4 /5 x 2.5 x 10
Conductivity=4/125
Conductivity=3.2x[tex]10^{-2}[/tex][tex]ohm^{-1} m^{-1}[/tex]
How do stairs reduce the
amount of effort needed to
get work done?
A. They require a large force over a long
distance.
B. They require a small force over a long
distance.
C. They require a large force over a short
time.
The force on the wire is directed?
Answer: A
Explanation:
In case of a Crash the pilot of the plane jumped from it and opened his parachute after falling through 40m
Answer: 20m
Explanation: because half 40 is 20
Answer:
20m
Explanation: because half 40 is 20
describe one example of how a person's religious faith associated with a world religion can be seen in an incident from their life.
Answer:
The Crusades, the many periods of persecution of Jews, religious conflicts between Catholics and Protestants in sixteenth- and seventeenth-century Europe, the execution of hundreds of Christians in seventeenth-century Japan, the Mormon expulsion from Missouri and Illinois in the 1840s, the Branch Davidian conflagration
Which labels belong in the regions marked X, Y, and Z?
OX: Smaller nuclei form
Y: Thermal energy is produced
Z: A larger nucleus forms
OX: Large amounts of energy are released
Y: One or more neutrons is released
Z: Smaller nuclei form
OX: One or more neutrons is released
Y: A larger nucleus forms
Z: Large amounts of energy are released
OX: A larger nucleus forms
Y: Large amounts of energy are released
Z: Smaller nuclei form
The following depict the letters X, Y and Z
X: A larger nucleus formsY: Large amounts of energy are releasedZ: Smaller nuclei formWhat is fusion and fission?Fusion refers to a situation in which two light nuclei come together to form a heavier nucleus. Fission refers to the disintegration of a nucleus by the bombardment of a particle.
The portions that show the letters marked X, Y and Z are;
X: A larger nucleus formsY: Large amounts of energy are releasedZ: Smaller nuclei formMissing parts:
Roberto makes a graphic organizer to compare fusion nuclear reactions and fission nuclear reactions. A venn diagram with 2 intersecting circles The circle on the left is labeled fusion. The circle on the right is labeled fission. There is a Z in the fission circle. There is an Y in the intersecting area. There is an X in the fusion circle. Which labels belong in the regions marked X, Y, and Z?
OX: Smaller nuclei form
Y: Thermal energy is produced
Z: A larger nucleus forms
OX: Large amounts of energy are released
Y: One or more neutrons is released
Z: Smaller nuclei form
OX: One or more neutrons is released
Y: A larger nucleus forms
Z: Large amounts of energy are released
OX: A larger nucleus forms
Y: Large amounts of energy are released
Z: Smaller nuclei form
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Answer: D
Explanation: I just took the exam review in edge 2022 and got it right
An object whose mass is 0.092 kg is initially at rest and then attains a speed of 75.0 m/s in 0.028 s. What average net force acted on the object during this time interval?
Answer:
F = 246.4 N
Explanation:
Concepts:Newton's Laws Of MotionFirst Law: (Law of Inertia)
Inertia refers to the tendency of an object to resist any change in its state of motion. Inertia is a measure of the objects mass.Second Law:
refers to an object's motion when a net force does not equal zero. Acceleration is directly proportional to the net force and inversely proportional to the object's mass.Third Law: (Action - Reaction)
Whenever one object exerts a force on a second object, the second objects exert an equal but opposite force on the first.Weight:
Force of gravity is the weight of an object and is measured in Newtons.Friction:
Frictional forces always oppose motion. The frictional forces ([tex]F_f[/tex]) is proportional to the coefficient of friction (Ц) and to the normal force [tex](F_n) F_f=uF_n[/tex].The normal force is a contact force which acts perpendicular to the common surface of contact.Now onto the steps:
----------------------------------
F = mΔV ÷ t
F = 0.093 x 75 ÷ 0.028
F = 246.4 N
Therefore, the average net force acted on the object during this time interval is 246.6 Newtons.
PLS HELP: How do you think the mass media present mental disorders? Do you think the portrayals are accurate or inaccurate? Why?
The mass media present mental disorders by the daily soap programs and movies.
What is mass media?Mass media is the means of communication that reach large numbers of people in a few seconds through optical fiber transmission cables connection, such as television, newspapers, magazines, and radio.
Studies show that both entertainment and news media provide dramatic and distorted images of mental disorders. It can lead to more dangerous personality to develop in people including fear, rejection, derision and ridicule. The criminal activity has received heavy coverage in the mass media.
Thus, the mass media present mental disorders by the daily soap programs and movies.
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Which word is described by this statement? This is the top of the volcano where sulfur-filled gasses and lava come out.
Answer:
I believe it is crater.
A 84-kg man stands on a bathroom scale inside an elevator. the scale measures in units of newtons. (a) the elevator accelerates upward from rest at a rate of 1.20 m/s2 for 1.50 s. what does the scale read during this 1.50 s interval
Answer:
94 kg
Explanation:
The mass registered by the scale is based on the assumption that the force applied is due entirely to gravity. If the force is greater, then the indicated mass will be greater.
__
how many g'sAs a fraction of the acceleration of gravity, the elevator's acceleration is ...
(1.2 m/s²)/(9.8 m/s²) ≈ 6/49
net forceThe force required to produce a given acceleration is found by the formula ...
F = ma . . . . . . . force on mass m to produce acceleration 'a'
When the man is stationary on the scale, the upward force it supplies is balanced by the downward force on the man due to gravity. The force and the mass are proportional, and the constant of proportionality (the acceleration due to gravity) is used to calibrate the scale. More force is thus translated to a higher mass reading.
Since the man's net acceleration is upward at the rate of 6/49×g, the total force applied by the scale is (1 +6/49) = 55/49 times as great as when the man is stationary. This greater force gets translated to a greater mass reading.
The force is equivalent to what would be required to support a stationary man with a mass of ...
(84 kg)(55/49) = 94 2/7 kg
The scale would read about 94 kg during the upward acceleration period.
A cue ball of inertia m is given a speed v before it collides elastically with a full rack of 15 stationary balls in a game of pool. Each of the 16 balls has an inertia m.
The final speed of the 15 stationary balls in a game of pool is determined as the ratio of inertia of the cue ball to total mass of the 15 balls.
Final speed of the 15 balls
The final speed of the 15 balls can be determined by applying the principle of conservation of linear momentum as shown below;
J = ΔP
where;
J is inertia ΔP is change in momentumm1u1 + m0u0 = m1v1 + m0v0
where;
m1 is mass of the cue ballm0 is mass of the 15 ballsu is initial velocityv is final velocitym1u1 - 0 = m1v1 + 15mv0
m1u1 - m1v1 = 15mv0 - 0
recall, m1u1 - m1v1 = ΔP = J
-m = 15m0v0
v0 = -m/15m0
where;
v0 is the final speed of the 15 balls15m0 is the total mass of the 15 ballsm is the inertia of the cue ballThus, the final speed of the 15 stationary balls in a game of pool is determined as the ratio of inertia of the cue ball to total mass of the 15 balls.
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A light pointer is stuck to the rubber sheet so that it pivots about a point P near the
rim of the glass, as shown (enlarged) below.
This arrangement acts as a simple thermometer.
State two disadvantages of such a thermometer.
why is it difficult to move the heavier object than the lighter object on any surface
Answer:
it's is because the heavier the object is the more it will be pulled down by gravity n the lighter the object the lesser the gravity will pull it down
Answer:
why is it difficult to move the heavier object than the lighter object on any surface
Two astronauts are taking a spacewalk outside the International Space Station. The first astronaut has a mass of 85.2 kg. The second has a mass of 65.4 kg. Initially, both astronauts have zero velocity relative to each other. Then, the astronauts push against each other, giving the first astronaut a final velocity of 1.2 m/s to the left. If the momentum of the system is conserved, what is the final velocity of the second person?
A. 1.3 m/s to the left
B. 1.6 m/s to the right
C. 1.6 m/s to the left
D. 1.3 m/s to the right
The final velocity of the second person after the collision is determined as 1.6 m/s to the right.
Final velocity of the second person
The final velocity of the second person is determined by applying the principle of conservation of linear momentum.
m1u1 + m2u2 = m1v1 + m2v2
85.2(0) + 65.4(0) = 85.2(-1.2) + 65.4(v2)
0 = -102.24 + 65.4v2
65.4v2 = 102.24
v2 = 1.56 m/s to the right
Thus, the final velocity of the second person after the collision is determined as 1.6 m/s to the right.
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