A 4.8-kg suitcase is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the suitcase and the floor is 0.28.


a) If the elevator is moving upward at a constant speed of 1.6 m/s, find the kinetic frictional force acting on the suitcase.


b) If the elevator is accelerating upward at 1.6 m/s?, find the kinetic frictional force acting on the suitcase


c) If the elevator is accelerating downward at 1.6 m/s, find the kinetic frictional force acting on the suitcase.

The power output of  2.00 kg object is accelerated uniformly from rest to 3.00 m/s while moving 1.5 m across a level frictionless surface is 24.09 watts.

In science, power is the time required to do work or provide energy, expressed as work done W or energy transferred divided by the time interval t - or W/t. A fixed amount of work can be done for a long time with a low-powered engine, or for a short time with a high-powered engine. The unit of power is work (or energy) per unit of time. Such as foot pounds per minute, joules (or watts) per second, and ergs per second. Force can also be expressed as the product of the force required to move an object and the object's velocity in the direction of the force. If the magnitude of the force F is measured in pounds and the velocity ν is measured in feet per minute, then the power is equal to Fν foot pounds per minute.

Given,

Mass of object (m) = 2.00 kg

Distance covered (s) = 1.5 m

Velocity of object (v) = 3.00 m/s

For calculation of acceleration:

v² = u² + 2as

3² = 0 + 2 × a × 1.5

9 = 3a

a = 2 m/s²

For calculation of time:

s = ut + ¹/₂at²

1.5 = 0 × t + ¹/₂ × 2 × t²

1.5 = t²

t = 1.22 sec.

For calculation of gravitational force:

F = mg

F = 2 × 9.8

F = 19.6 N

For calculation of work done:

W = F × s

W = 19.6 × 1.5

W = 29.4 J

For calculation of power output:

P = W/t

P = 29.4/1.22

P = 24.09 watts

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If you represented earth's history by a line that is 2 m long then, the segment length in 400 million years will be 43.2 cm.

The entire history of the Earth is represented by a line 5 meters long.

The age of the Earth is 4.6 billion years.

That means a length of 5 meters or 500 cm (1m = 100cm, so 5m = 5× 100 = 500 cm) represents 4.6 billion years, i.e 4600million years. (As 1 billion years = 1000 million years)

We have to calculate the length of the segment for 400 million years.

In 4600 million years, the segment length is = 500 cm

In 1 million years, the segment length will be = 500 / 4600 = 0.108 cm

In 400 million years, the segment length will be = 0.11 × 400 =  0.108 × 400 = 43.2 cm

Therefore, the segment length in 400 million years will be 43.2 cm.

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Answer:

E max

=3.46×10

7

N/C

Explanation:

If the radius and charge are R and Q. We need to calculate the electric field due to the rod. Using formula of electric field. Where, Q = charge. z = distance. If z = 0, Then, The electric field is (b). If z = ∞, z>>R. So, R = 0. Then, the electric field is (c). In terms of R, We need to calculate the positive distance. If . Then, Taking only positive distance (d).

Friction is an opposition force acting on the surface of the body that tries to oppose the motion of the body. its unit is Newton (N) . The minimum coefficient of static friction is k= αtanβ.

It is a particular form of opposing force that is acting on the body's surface and seeks to stop the body from moving. its measure is in Newton (N). It is described mathematically as the result of the friction coefficient and normal reaction.

The equation becomes balanced once the specified force and acceleration have been resolved in each of the individual components.

X-directional components

On an incline, find the acceleration

Masina -F= ma

mgcosa =R

F=ur

Slippage must be prevented by a frictional force that is less than the maximum static friction force. We'll use constants like to represent the proportion between the opposite and adjacent sides of the ramp. At this point, ma equals the frictional force. Previously, a=gsin was found to exist. Equating both terms:

αmgsinβ = Kmgcosβ

K= α(sinβ/cosβ)

sinβ/cosβ= tanβ

k= αtanβ

Thus, the minimum coefficient of static friction is k= αtanβ.

A bowling ball rolls without slipping up a ramp that slopes upward at an angle β to the horizontal. Treat the ball as a uniform, solid sphere, ignoring the finger holes.a. What is the acceleration of the center of mass of the ball?b. What minimum coefficient of static friction is needed to prevent slipping?

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The coconut is subject to a downward force of 1.47 N from gravity. The gravitational pull of the tree causes a coconut to fall from it.

The gravitational pull is both an attracting and non-contact force. The coconut consequently falls from the tree. Given that palm trees may reach heights of up to 30 meters (98 feet) over, or the equivalent of an 8-story building, a coconut can fall at a rate of up to 85 kilometers per hour (53 mph). Accordingly, the force of the coconut as it lands on the ground is equal to a ton of weight.

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The magnitude of the average acceleration is [tex]4.2 m/s^{2}[/tex].

Acceleration is the rate of change of an object's velocity with respect to time. Acceleration is a vector quantity (as long as it has magnitude and direction). The direction of an object's acceleration is given by the direction of the net force acting on that object.

As described in Newton's second law, the magnitude of an object's acceleration is the combined effect of two sources.

-The mass of this object is inversely proportional to the mass of the    object.

-Depending on the material from which it is made.

Calculation :

Use the equation of linear motion:

[tex]v^{2} =( v_{0} )^{2} = 2a(x-x_{0} )[/tex]

Therefore

[tex]v = 0 m/s[/tex]          - final velocity is zero

[tex]v_{0} = 5.0 m/s[/tex]      - greater than initial Velocity

[tex]x - x_{0} = 3.0m[/tex]   - this is the displacement.

now, a is what you are looking for.

   [tex]0 = 5^{2} + 2a*3[/tex]

   [tex]-25 = 6a[/tex]

   [tex]a = \frac{-25}{6}[/tex]

   [tex]a = -4.2 m/s^{2}[/tex]

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The value of the resistor is 24Ω.

A resistor is a passive two-terminal electrical component used in circuits to implement electrical resistance. Resistors have a variety of purposes in electronic circuits, including lowering current flow, adjusting signal levels, dividing voltages, biassing active components, and terminating transmission lines.

We are given that,

Voltage = δv =8v

Current = i =6a

So that , the resistance can be calculated by the formula by,

R = Vi

R = 8v × 6a

R = 24 Ω

Therefore , the of resistor would be 24Ω.

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If the darts are thrown at the same speed then (b) Projectile that travels along trajectory B was projected earlier and (c) Second dart must be projected at angle, such that 0 + 0,8 = 90° is correct.

Initial speed of dart A = u'

Angle of dart A = θ'

Initial speed of dart B = u''

Angle of dart B = θ''

The initial speed of both the darts is same,

Thus, u' = u'' = u

The darts are projected from same point A but not at same time; they are thrown one by one. But they travel same horizontal distance and reach B at the same time.

Since the horizontal range of both darts are same,

= [ u²sin(2θ') / g ] =  [ u²sin(2θ'') / g ]

= sin(2θ') = sin(2θ'')

Now, θ' is not equal to θ'', through the figure we can assume that θ'' > θ'

Since both are acute angles,

= sinθ'' > sinθ'

Multiplying both sides by 2u/g, we get,

= [ 2u X sinθ'' / g ] > [ 2u X sinθ' / g ]

which means, trajectory T of both the darts is as:

= T'' > T'.

Thus, statement B and C are correct options.

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The complete question:

A man wishes to throw two darts one by one at the target at B with same speed so that they arrive at the same time. Mark the correct statements about the two projections. Trajectory B Trajectory A А. B (A) Projectile that travels along trajectory A was projected earlier (B) Projectile that travels along trajectory B was projected earlier. (C) Second dart must be projected at angle e, such that 0 + 0,8 = 90° (D) Second dart must be projected at angle , >, STA​

The forces that the book exerts on the earth because it describes the same interaction.

A book on a table exerts a downward force on the table, and the table exerts an upward reaction force on the book. The book remains stationary because the forces are equal and opposite. These forces are the earth's gravitational pull exerting a downward force and the pressure of the table against the book.

Because the force exerted by the table on the book is the same and opposite to the force exerted by the earth. Yes, action-reaction exists in this case. The book exerts a force on the table that acts on the book due to gravity. At the same time, the table exerts an equal and opposite force on the book. So the book is fixed on the table.

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A satellite travelling at 3600 km per hour in a stable circular orbit around the earth has a speed of 6320 m/s.

Utilizing mass (of the earth and satellite) and the separation between the satellite and the earth's core, one can calculate the gravitational pull (or force) between a satellite and the earth.

The gravitational equation is v = √GM/r, where

v = orbital velocity (m/s)

G = 6.67x10-11Nm2kg2 (gravitational constant)

M is the orbiting body's mass (kg)

orbital radius, r (m)

5.97 x 10^24 kg is the Earth's mass, or M.

r = height + Earth's radius equals (6370 + 3600) x 10^3 = 9970 x 10^3 = 9.97 x 10^6 m

v = (6.67 x 10-11) x (5.97 x 10^24) / (9.97 x 10^6) = 6320 m/s

Hence speed of satellite is 6320m/s

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10 to the power 6 grams is the mass of 235u that, when undergoing induced fission, would produce the same amount of thermal energy as 1 tonne of coal.

The process of nuclear fission involves the splitting of an atom's nucleus into two or more smaller nuclei. Even by the energetic standards of radioactive decay, the fission process releases a very high quantity of energy and frequently results in gamma photons. German chemist Otto Hahn and his assistant Fritz Strassmann made the discovery of nuclear fission of heavy elements with the help of Austrian-Swedish physicist Lise Meitner. Hahn recognized that there had been an atomic "burst."  Meitner and her nephew Otto Robert Frisch conceptualized it in January 1939. Frisch gave the procedure its name using the analogy of biological cell division. Nuclear fission is an extremely dense source of energy because the quantity of free energy present in nuclear fuel is millions of times more than the amount of free energy present in an equivalent mass of chemical fuel, such as gasoline. Nuclear waste is a problem because the byproducts of nuclear fission are, on average, far more radioactive than the heavy elements that are typically fissioned as fuel and stay so for long periods of time. Plutonium is created by neutron absorption that does not result in fission from 238 U, as well as small actinides from both 235 U and 238 U.

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As per Torricelli's Theorem velocity of efflux, i.e., the velocity with which the liquid flows out of a hole is equal to [tex]\sqrt{2gh[/tex]

Where h = the depth of the hole below the liquid surface.

According to Bernoulli's principle, "Within a horizontal flow of fluid, points of higher fluid speed will have less pressure than points of slower fluid speed."

The more depth the hole is, the more the velocity of the liquid that comes out of the hole. The velocity is maximum if the hole is at the bottom of the tank.

Pipe velocity is an area-averaged property independent of the pipe's cross-sectional flow distribution. It does not matter whether the flow is laminar or turbulent. Along the central axis, fluid may be traveling at twice the calculated pipe velocity.

The given question is incomplete, the related concepts has been described  here for reference.

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If a neutron moves with a speed of 0.99c, its total energy is 1.07nJ, the rest energy is 0.15nJ , and kinetic energy is 0.92nJ

Given speed of neutron (v) = 0.99c

Mass of neutron = 1.674*10-27 kg

Total energy  = Rest energy +Kinetic energy

Let the Rest energy be E = mc^2

E = 1.674*10-27 kg x (3x10^8)^2 = 0.15nJ

E = 939.32MeV

Total energy (Er) = γmc^2

where γ = 1/√1-(v/c)^2

Er =  E/√1-(v/c)^2 = 939.32/√1-(0.99/3x10^8)^2

Er = 939.32/√1-0.9801 = 939.32/0.1411 = 6657.12MeV = 1.07nJ

Kinetic energy ( KE) = Total energy(Er) - rest energy(E)

KE = 1.07 - 0.15 =0.92nJ

Hence the rest energy of neutron is 0.15nJ while the total energy is 1.07nJ and kinetic energy is 0.92nJ

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Answer: The answer is 120 Newton.

A concave mirror having a focal length of magnitude 5.0 cm forms an image 4.0 cm behind the mirror. Thing that is present in front of the mirror is the object for this image.

A mirror with a curved reflecting surface is referred to as a curved mirror. The surface could be concave mirror or convex (bulging outward) (recessed inward). Although optical systems occasionally employ alternative shapes, most curved mirrors have surfaces that are formed like a portion of a spherical. Since spherical mirror systems, like spherical lenses, are subject to spherical aberration, the most prevalent non-spherical variant is found in optical instruments such as reflecting telescopes that must picture distant objects. Mirrors that distort images are used for amusement. Concave and convex sections on them provide purposefully distorted images. When the object is positioned at specific distances, they also offer images that are either magnified or greatly diminished (smaller). A curved mirror with a reflective surface that bulges in the direction of the light source is referred to as a convex mirror or diverging mirror. Convex mirrors do not focus light since they reflect it outward. Since the focal point (F) and the center of curvature (2F) are both fictitious positions "within" the mirror that cannot be reached, such mirrors always produce a virtual image.

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The sun's brightness is not increasing, nor has the separation between it and Earth. The greater heat must result from the atmosphere's greenhouse gases absorbing more infrared energy.

A greenhouse gas, often known as a greenhouse gas (GHG or GhG), is a gas that produces the greenhouse effect by both absorbing and emitting radiant radiation in the thermal infrared range. Water vapour, carbon dioxide, methane, nitrous oxide, and ozone are the main greenhouse gases in the Earth's atmosphere (O3). Instead of the current average of 15 °C (59 °F), without greenhouse gases, the temperature of the Earth's surface would be closer to 18 °C (0 °F). Also containing greenhouse gases are the atmospheres of Venus, Mars, and Titan.

The amount of carbon dioxide in the atmosphere has grown by more than 50% due to human activity since the start of the Industrial Revolution (about 1750), rising from 280 parts per million in 1750 to 421 parts per million in 2022.

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The 4.0-m-long seesaw has a 5.0-kg cat and a 2.0-kg bowl of tuna fish at either end. To keep the seesaw balanced, a 4.0 kg cat must stand 1.5m to the left of the pivot.

Given length of seesaw (l) = 4m

Mass of first cat (m1) = 5kg

Mass of tuna fish (m) = 2kg

Mass of second cat (m2) = 4kg

Let the second cat is at a distance to the left of pivot = d

To keep the seesaw balanced we apply net momentum or torque theorem at pivot.

Torque net about pivot = 0

The pivot is situated at middle of seesaw so the distance from first cat to seesaw and from fish to seesaw = 2m

Force acted on first cat (F1) = m1xg = 5x9.8 = 49N

Force acted on second cat (F2) = m2xg = 4x9.8 = 39.2N

Force acted on tuna fish (F3) = mxg = 2x9.8 = 19.6N

Tourque(T) = force x distance (perpendicular)

Tnet= 49X2 - 39.2Xd - 19.6x2 = 0

58.8 = 39.2d

d = 1.5m

Hence the distance from the left of pivot where the second cat to be situated is 1.5m

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There are several reasons why you might want to keep your engine running when you are waiting to pick up your husband, even if you could stop the engine to save gas.

One reason is that keeping the engine running allows you to use the car's electrical systems, such as the lights, air conditioning, and wipers, without draining the battery. If you turn off the engine and use these systems, the battery will eventually drain, and you may have to jump-start the car to get it running again.

Another reason is that turning off the engine and restarting it can be hard on the engine and may reduce its lifespan. When you turn off the engine, all of the internal components come to a stop and may experience wear and tear when the engine is restarted. By keeping the engine running, you can avoid this additional wear and tear.

Finally, keeping the engine running may be more convenient and safer. It allows you to keep the car's systems running and be ready to drive at a moment's notice, which may be important if you are waiting in a potentially dangerous or unfamiliar location.

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The radius of the sphere is 0.065 meters

        Volume of the sphere: [tex]\frac{6 kg}{5000kg/m^{3} }[/tex] = 0.0012 [tex]m^{3}[/tex]

  3. Calculate the radius from the volume.

      The volume of sphere is defined with [tex]\frac{4}{3}[/tex] x [tex]\pi[/tex] x [tex]r^{3}[/tex]

From step 2, the volume is 0.0012 [tex]m^{3}[/tex]    so it can be written like this :

Volume =  [tex]\frac{4}{3}[/tex] x [tex]\pi[/tex] x [tex]r^{3}[/tex]

0.0012 =  [tex]\frac{4}{3}[/tex] x 3.14 x [tex]r^{3}[/tex]

   [tex]r^{3}[/tex] = [tex]\frac{0.0012 x 3}{4 x 3.14}[/tex]

[tex]r^{3}[/tex] = [tex]\frac{0.0036}{12.56}[/tex] = 0.000286

r = [tex]\sqrt[3]{0.000286}[/tex] = 0.065 meters

Thus, the radius of a sphere that has a density of 5000 kg/m3 and a mass of 6.00 kg is 0.065 meters.

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The average acceleration of the truck while making the turn is 5 m/s².

Average acceleration is defined as the change in velocity for a particular time interval.

Given that, initial velocity u = 30 m/s towards east = 30 m/s i

Final velocity v = 40 m/s towards south = 40 m/s j

We know the formula for average acceleration as the ratio of change in velocity upon time

⇒ (v - u)/t = (40 j - 30 i)/10 = 4 j - 3 i

The magnitude of average velocity | a'|

| a'| = √3²+4² =√(9 + 16) = √25 = 5 m/s²

Thus, the average acceleration of a truck while making the turn is 5 m/s².

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Centripetal refers to “center-seeking” Quantifies the change in directionof the velocity The acceleration is directed toward the center of the circle of motion.

The magnitude of the centripetal acceleration is given by V^2/r, the direction is toward the center of the circle. The tangential component of the acceleration is due to changing speed. The centripetal component of the acceleration is due to changing direction.

When an object is rotating at a constant angular velocity, the whole object has a constant angular velocity. Therefore, every mint on the turntable has the same, constant angular velocity.

The acceleration which causes the tangential velocity to change direction is called Centripetal acceleration. Centripetal acceleration is always in toward the center of the circle.

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Below is a list of the wavelengths in order of shortest to longest from left to right. Radiation comes in many different forms, including gamma rays, X-rays, UV, visible, infrared, microwaves, and radio waves.

The electromagnetic spectrum is made up of a wide variety of waves that are created when the electric field and magnetic field interact. It is believed that electromagnetic waves exhibit both wave and particle characteristics.

In essence, the photons—particle-like elements that make up electromagnetic waves and convey their energy, the wavelength and frequency of the waves. The class of electromagnetic waves is referred to as the "electromagnetic spectrum."

Electromagnetic waves are classified according to increasing wavelength: gamma rays, x-rays, ultraviolet, visible, infrared, microwaves, and radio waves.

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A man whose mass is 40kg walk up a flight of 20 step each 150mm height in 10 sec. The average power developed is 12.0 W.

The average power developed by the man as he walks up the stairs, you need to know the work he does and the time it takes him to do it. First, you can find the work done by the man by multiplying his weight (which is equal to his mass multiplied by the acceleration due to gravity) by the distance he travels:

= Work = (40 kg) x (10 m/s^2) x (20 steps x 0.150 m/step)

= 120 J

Then, you can divide the work done by the time it takes to do it to find the average power developed:

= Power = Work / Time

= 120 J / 10 s

= 12.0 W

So, the average power developed by the man as he walks up the stairs is 12.0 W.

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Typically, pulleys are used to raise objects, particularly heavy objects. The load is the thing that a pulley lifts. The effort is the force delivered to the pulley.

The first weight to be lifted up, if the man exerts enough force (T), is the one whose force of gravity (mass times g) is exceeded by 2T. Weights do matter since the force of gravity is proportional to mass; the lightest weight rises first. To lift the bucket out of the well, pulley systems are used. Pulleys are essential to the operation of numerous forms of workout equipment. Heavy materials can be lifted and moved using construction pulleys.

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The rate of change of observer to rocket distance is 864 ft/sec when the rocket is 2400ft from the ground.

This question can be solved using the Pythagorean theorem.

Let us assume that:

the distance between the observer and launch pad be x.

the vertical distance of rocket and the launch pad (ground) be y.

As it is given in the question that this scenario forms a right angled triangle. So let the distance BC be r as shown in figure.

We have to find the value [tex]\frac{dr}{dt}[/tex]. (rate of change of distance r)

According to the question,

AB=x= 700 ft

AC=y= 2400 ft

[tex]\frac{dy}{dt} =900 ft/sec[/tex]

By Pythagorean theorem,

[tex]x^{2} +y^{2} =r^{2} (equation 1)\\r^{2} =700^{2} +2400^2\\r=2500 ft\\[/tex]

On differentiating equation 1 we get,

[tex]2r\frac{dr}{dt} =0+2y\frac{dy}{dt} \\r\frac{dr}{dt} =y\frac{dy}{dt}[/tex]

On putting the values and solving we get

[tex]\frac{dr}{dt} =864 ft/sec\\[/tex]

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The refrigerant trace gas that should be used to identify a leak is the HCFC-22. Nitrogen gas should also be used along with trace gas.

HCFC-22, also known as chlorodifluoromethane, is a colorless gas that is used as a propellant and refrigerant. It was the most commonly used refrigerant for air-conditioning systems in buildings, but if it leaks, it may cause ozone depletion. Nowadays, it is still used but only when recovered and recycled.

One use of HCFC-22 is to detect a leak in a system. To do that, the system is pressurized with a trace quantity of HCFC-22 to a certain pressure, then dry nitrogen is used to further increase the system pressure. The trace refrigerant is enough to be detected by a leak detector.

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Answer: Average Velocity = Distance/Time

Average Velocity = 1.2km/5min

Average Velocity = 0.24km/min

Therefore, the average velocity of the traveller is 0.24km/min.

The main reason that the gravitational attraction between Earth and the Moon changes each day.

Option b is correct.

Tides are the result of the gravitational tug from the Moon and Sun that the Earth feels. If we disregard the Sun for now, the Earth's oceans facing the Moon bulge up in response to the lunar gravitational force: a high tide.

Even though the sun is much more massive and therefore has stronger overall gravity than the moon, the moon is closer to the earth so that its gravitational gradient is stronger than that of the sun.

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Nuclear fission reactions result in the release of kinetic energy.

What is nuclear fission ?

Nuclear fission is the procedure in nuclear physics whereby an atom's nucleus divides into two daughter cells

Nuclear fission is the process by which an atom's nucleus breaks into two lighter nuclei during a nuclear reaction. This decay may occur naturally as a result of spontaneous radioactive decay, or it may be replicated in a laboratory setting by meeting the appropriate circumstances (bombarding with neutrinos). The resultant fragments typically weigh less when combined than the initial bulk. In the aforementioned process, the missing mass is what is transformed into nuclear energy.The kinetic velocities of the neutrons and fission products make up the majority of the energy released. uranium-235, plutonium-239, a combination of the two typical of modern nuclear power reactors, and uranium-233 utilised in the thorium cycle thermal neutron fission product yields by mass.

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Answer: If you drop ice into hot water will result in the ice melting

Explanation: