What is Newton's Law of Conservation of Momentum?

Answer:

K.E = 100 J

Final P.E = 100 J

Explanation:

The kinetic energy of any object can be given by the following formula:

\(K.E = (\frac{1}{2})mv^{2}\)

where,

K.E = Kinetic Energy

m = mass of ball = 2 kg

v = speed of ball

Initially, v = 10 m/s. Therefore, the initial K.E is given as:

\(K.E = (\frac{1}{2})(2\ kg)(10\ m/s)^{2}\)

K.E = 100 J

Now, at the highest point the K.E of the ball becomes zero. because the ball stops for a moment at the highest point and its velocity becomes zero. So, from Law of Conservation of energy:

Initial K.E + Initial P.E = Final K.E + Final P.E

Initial P.E is also zero due to zero height initially.

K.E + 0 = 0 + Final P.E

Final P.E = 100 J

Answer:

Explanation:

From the given information, we are to compare the minimum energies required to remove a neutron from  \(^{41}_{20}Ca\),  \(^{42}_{20}Ca\)  and  \(^{43}_{20}Ca\)

To start with   \(^{41}_{20}Ca\); the minimum  energy required to remove a neutron from\(^{41}_{20}Ca\) is :

= \(E ( ^{41}_{20} Ca) - E ( ^{40}_{20} Ca) - E ( ^{1}_{0} n)\)

= (38156.36 - 37225.15 -939.57) MeV

= -8.36 MeV   Since energy is being given out

Thus, E = 8.36 MeV

the minimum  energy required to remove a neutron from \(^{42}_{20}Ca\) is :

= \(E ( ^{42}_{20} Ca) - E ( ^{41}_{20} Ca) - E ( ^{1}_{0} n)\)

= ( 39084.46 - 38156.36 - 939.57) MeV

= -11.47 MeV     Since energy is being given out

Thus, E = 11.47 MeV  

the minimum  energy required to remove a neutron from \(^{43}_{20}Ca\) is :

= \(E ( ^{43}_{20} Ca) - E ( ^{42}_{20} Ca) - E ( ^{1}_{0} n)\)

= (40016.10 -39084.46 -939.57) MeV

=  - 7.93 MeV     Since energy is being given out

Thus, E =7.93  MeV

Why there is a distinct increase of this energy for \(^{42}_{20}Ca\) ?

This is as a result of electronic configuration of \(^{42}_{20}Ca\) which posses the same number of proton and neutron, as such, \(^{42}_{20}Ca\) tends to acquire more stability. For this reason, it will be difficult to remove a neutron from \(^{42}_{20}Ca\) .

Answer:

Balanced forces.

Explanation:

The three main forces that stop moving objects are friction, gravity and wind resistance. Equal forces acting in opposite directions are called balanced forces. Balanced forces acting on an object will not change the object's motion. When you add equal forces in opposite direction, the net force is zero.

Given :

Liquid is poured into a burrete so that it reads 14cm³.

50 drops were run each of volume 0.1cm³ .

To Find :

The volume of liquid in burrete after 50 drops.

Solution :

Volume of each drop, v = 0.1 cm³.

Initial volume in burrete, V = 14 cm³.

Now, volume left after droping 50 drops are :

\(L = V - 50v\\\\L = 14 - 50\times 0.1 \ cm^3 \\\\L = 9 \ cm^3\)

Therefore, the volume left in burrete is 9 cm³ .

The equation ΔU=Q-W is commonly referred to as the first law of thermodynamics.

Where...

"ΔU" represents the change in internal energy of a system.

"Q" represents the sum of all heat transferred in and out of a system.

"W" represents the work done by the system.

The law simply states that energy is not created nor destroyed, it can only be converted from one form to another (such as heat, light, etc..).  

Answer: The  Answer Is A

Explanation:

Answer:

c

Explanation:

what poping

An example of the transfer of thermal energy by conduction is water in the entire pot is warmed when it is heated from the bottom. Hence, option B is correct.

When matter or particles physically touch each other, energy is transferred by conduction. Heat or electricity can be transferred as a result of the conduction phenomena.

The kinetic theory states that matter is composed of particles that move randomly and continuously. Thermal energy is produced by the random movement or vibration of the constituent parts of matter. Particles with more kinetic energy generate more heat, which increases the measurement of heat, or temperature. Temperature is an indicator of the typical kinetic energy contained in a group or volume of particles.

Conduction is the process in which direct contact between objects is required. Hence, it is concluded that option B is correct.

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Answer: An ice cube melts in a person's hand

Explanation:

just took the test

The equivalent resistance is always less than the smallest resistor in the parallel network.

Then the inverse of the equivalent resistance of two or more resistors connected in parallel is the algebraic sum of the inverses of the individual resistances.

If the two resistances or impedances in parallel are equal and of the same value, then the total or equivalent resistance, \(R_t\) is equal to half the value of one resistor. That is equal to R/2 and for three equal resistors in parallel, R/3, etc.

Note that the equivalent resistance is always less than the smallest resistor in the parallel network so the total resistance, \(R_t\) will always decrease as additional parallel resistors are added.

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The equation Jerry should use for the total resistance in a series circuit is R = R₁ + R₂ + R₃.

option A.

In a series circuit, all components are connected end-to-end, forming a single path for current flow.

A series circuit can contain any combination of resistors, capacitors, and inductors.

In a series circuit, the current flowing in each circuit component is the same  and the voltage drop in each circuit component is different.

Based on this, the total formula for the total resistance in a series circuit is given as;

R = R₁ + R₂ + R₃

where;

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The y-axis would represent the displacement/amplitude (y) of the wave, and the x-axis would represent time (t). This allows us to observe how the displacement of the wave changes over time during one complete period.

The correct answer is (c) y and t.

When representing one period of a wave on a string, the variable "y" represents the displacement or amplitude of the wave at a particular point on the string, and the variable "t" represents time.

Therefore, the y-axis would represent the displacement/amplitude (y) of the wave, and the x-axis would represent time (t). This allows us to observe how the displacement of the wave changes over time during one complete period.

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Answer:

I think this statement is true at least in modern day times. The world runs on nothing but technology. People use more technology instead of old school textbooks and papers. Imagine living in a world without technology… that means no cars, no trains, no devices, no machines like your stove or printer, no lights and lots more. John Wesley is 100 percent correct with this statement. Electricity is indeed the powerhouse of the universe.

Answer:

The Venusian atmosphere supports opaque clouds of sulfuric acid, making optical Earth-based and orbital observation of the surface impossible. Information about the topography has been obtained exclusively by radar imaging. Aside from carbon dioxide, the other main component is nitrogen

Explanation:

Because Venus has such a dense atmosphere which is some 100 times thicker than the earth's. Evidently, Venus is sufficiently close to the Sun that the little carbon dioxide it had in its early, Earth-like atmosphere caused the surface to warm up and leach out more carbon dioxide into the atmosphere.

Answer:

F = G M m / R^2

F1 = G M m / R1^2

F2 = 4 G M m / R2^2

F2 = 16 F1

The work done in stretching the spring from its natural length to 7 inches beyond its natural length is 112.5 ft-lb.

We are given a spring which is stretched beyond its natural length by 2 inches, by applying a force of 10 pounds.

We have to calculate the work done in stretching it further to 7 inches beyond its natural length, in ft-lb.

In order to calculate the work done, we need to know the spring constant (k) of the spring and then use the formula for work done by a spring, which is given by

W = (1/2)k(x2² - x1²)

Where, W is the work done, k is the spring constant, x1 is the initial position of the spring, and x2 is the final position of the spring.So, we need to find the spring constant k of the spring, in order to calculate the work done.Let the spring constant be k lb/inch.

We know that F = kx

where, F is the force applied, x is the displacement, and k is the spring constant.

Substituting the values, we get10 = k(2)k = 5 lb/inch.

Now, we can use the formula for work done, which is W = (1/2)k(x2² - x1²)

Substituting the values, we get W = (1/2)(5)(7² - 2²)W = (1/2)(5)(45)W = 112.5 ft-lb.

Therefore, the work done in stretching the spring from its natural length to 7 inches beyond its natural length is 112.5 ft-lb.

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Answer:

As the atmospheric pressure decreases with increase in altitude, when a sealed bag of chips is taken to higher altitude then the pressure of the gases inside the bag become greater than the outer atmospheric pressure and apply pressure on the side covering of the chips bag due to which the chips bag expand.

Answer: neutrinos

Explanation:

Answer:

B

Explanation:

The question does not specify any outside forces that could slow down the ball horizontally. There fore the ball does not accelerate or decelerate horizontally. Therefore,  a = 0m/s2

the speed of the fast train is: u = 1.4 x 10^2 m/s

The beat frequency is the difference between the frequencies of the two sound waves coming from the trains. We can use this information to calculate the speed of the fast train.

First, we need to know the frequency of the sound wave emitted by each train. Let's call the frequency of the sound wave from the fast train f1 and the frequency of the sound wave from the slow train f2.

We can use the formula for beat frequency:

beat frequency = |f1 - f2|

Plugging in the given beat frequency of 4.2 Hz, we get:

4.2 Hz = |f1 - f2|

Next, we can use the Doppler effect formula for sound:

f = (v +/- u) / (v +/- vs) * f0

where:
f = observed frequency
v = speed of sound (343 m/s)
u = speed of the observer (unknown)
vs = speed of the source (unknown)
f0 = frequency of the sound wave emitted by the source

For the observer standing near the tracks, we can assume that vs = 0.

So for the sound wave from the fast train, we have:

f1 = (v + u) / v * f0

And for the sound wave from the slow train, we have:

f2 = (v - u) / v * f0

Substituting these into the beat frequency equation and simplifying, we get:

4.2 Hz = u / v * f0

Solving for u, we get:

u = 4.2 Hz * v / f0

Plugging in the given frequency of the sound wave from the fast train (which is the same as f0), we get:

u = 4.2 Hz * 343 m/s / f1

Rounding to two significant figures, the speed of the fast train is:

u = 1.4 x 10^2 m/s

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Answer:

.

Explanation:

\(c_{water} = 2.25\times 10^{8}m/s\)

Explanation:

The speed of light in any medium is given by

\(c = \lambda \nu\)

where \(\lambda\) is the wavelength and \(\nu\) is the frequency. In water,

\(c_{water} = \lambda_{water} \nu\)

\(\:\:\:\:\:\:\:\:= (3.75\times 10^{-7}\:m)(6\times 10^{14})\:Hz\)

\(\:\:\:\:\:\:\:\:= 2.25\times 10^{8}\:m/s\)

The voltage-to-frequency ratio is 8 when using variable frequency speed control on a motor with a nameplate rating of 480v at 60 hz.

A drive that alters the frequency of the current going to a non-servo AC motor to change the motor's speed but not its precise location.

The Frequency Can Change An induction motor's speed can be managed by the application of control. By adjusting the supply frequency, the motor speed and synchronous speed can both be managed.

A variable speed limit is a flexible restriction on how fast drivers are allowed to travel along a certain section of road. Depending on the environment and the state of the roads, the posted speed limit fluctuates.

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Answer:

Brainliest please

Explanation:

I will start by saying that Metals by their very nature are conductors of electricity. Now metals exhibit “metallic bonding” which holds its structure together. Unlike other materials which exhibit covalent bonding, it's atoms are not bonded by “electron sharing”. Rather they are bonded by the availability of valence electrons. Now within a metals atomic structure, the metal atoms lose the electrons in thier outermost shell (valence electrons), thus becoming positively charged ions (cations )

The vertical rise of the load during 10 seconds is approximately 490.5 meters.

Uniformly accelerated motion is a type of motion in which an object moves along a straight line with a constant acceleration. This means that the object's velocity changes at a constant rate over time, with equal changes in velocity occurring during equal time intervals.

We can use the kinematic equation for uniformly accelerated motion to determine the vertical rise of the load:

h = vit + (1/2)at²

where:

h is the vertical rise of the load (in meters)

vi is the initial vertical velocity of the load (in meters per second)

a is the vertical acceleration of the load (in meters per second squared)

t is the time interval (in seconds)

Since the load is being hoisted upward, its initial vertical velocity is zero, so vi = 0. The vertical acceleration of the load is equal to the acceleration due to gravity, which is approximately 9.81 m/s².

To use this equation, we need to convert the constant rate of cable draw, 180 mm/s, to meters per second:

180 mm/s = 0.18 m/s

Now we can plug in the values:

h = (0 m/s)(10 s) + (1/2)(9.81 m/s²)(10 s)²

h = 490.5 meters

Therefore, the vertical rise of the load during 10 seconds is approximately 490.5 meters.

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Answer:

1298.5watt

Explanation:

Power is defined as the rate at which work is done

Expressed mathematically as;

P = F × d/ t; F = force or weight of object ;d is height or distance sustain and t is time covered

Hence for 1 person the power consumption is ;

Note weight =mass× acceleration of free fall due to gravity,g

g is known as 9.8m/S2

Time taken is 1min which is 60 sec

60 ×9.8 × 5.3/60 = 51.94 watt

Hence for 25 persons we have

25 × 51.94 =1298.5watt

1.3kilo watt( kilo is 1000)

The work done by the escalator is 3,080.4 joules and the power requirement of the escalator to move 25 passengers every minute is approximately 51.34 watts.

The Work Done is calculated as:

Force (F) = 60 × 9.8

Distance (d) = 5.30 meters

Work (W) = F × d

Work (W) = (60 × 9.8) × 5.30

Work (W) = 3,080.4 joules

The Power is calculated as:

Time (t) = 1 minute

Power (P) = Work / Tim (t)

Power (P) = 3,080.4 / 60

Power (P) = 51.34 watts

Therefore, the power requirement of the escalator to move 25 passengers every minute is approximately 51.34 watts.

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Buying or selling the Earth will go against the rights of the inhabitants of the world (humans and other living beings).

Solar influence

The relation to determine Roche limit is:

\(Roche Limit=(2.423) (Rp3) {{\sqrt[3]{\frac{D_{P} }{D_{m} } } } }\)

Here  is radius of planet and  are density of planet and moon respectively.

According to the problem,

Density of Earth, = 5.5 g/cm³

Density of Moon, = 3.34 g/cm³

Consider  be the radius of the Earth.

Substitute the suitable values in the equation (1).

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The length of the rubber band that the boy must use is 0.024 m or 24 mm.

To determine the length of the rubber band, we can use the formula for the potential energy stored in a stretched spring, which is also applicable to a stretched rubber band:

where U is the potential energy stored in the rubber band, k is the spring constant (or in this case, the rubber band constant), and x is the displacement of the rubber band from its natural length.

Since the rubber band is stretched by 0.25 of its natural length, the displacement x is 0.25 times the natural length of the rubber band.

We can solve for the rubber band constant k by using the formula for the velocity of a projectile launched by a spring (or in this case, a rubber band):

where v is the velocity of the projectile, m is the mass of the rubber band, M is the mass of the projectile, and k is the spring constant. We can rearrange this equation to solve for k:

k = (v² M) / (2 m)

We can now combine the two equations to solve for the length of the rubber band, L:

U = 1/2 k x²

U = 1/2 ((v² M) / (2 m)) (0.25 L)²

U = (v² M L²) / (32 m)

The potential energy stored in the rubber band must be equal to the kinetic energy of the projectile when it is launched:

U = 1/2 M v²

(v² M L²) / (32 m) = 1/2 M v²

L = ((16 m v²) / (k M))

L = ((16 m v²) / ((v² M) / (2 m) M))

L = √(32 m^2 / M)

L = (0.032 M)

Substituting the given values, we get:

L = √(0.032 * 0.006)

L = 0.024 m

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