What is the representation of the momentum vector?
1. a number
2. a dot
3. a straight line
4. an arrow **

The height from which the engineer needs to release the ball is :  11.811 m

Given data:

Mass of wrecking ball = 52 kg

velocity of wrecking ball ( Vf ) = 12.3 m/s

Initial velocity of ball ( Vi ) = 0 m/s

final height ( hf ) = 4.1 m

Applying the principle of energy conservation

 Initial energy = final energy

= 1/2 mV²i  + mghi =  1/2 mV²f  + mghf  ----- ( 1 )

given that Vi = 0 also cancelling out m from both sides

Equation ( 1 ) becomes

=  0   +   hi   =  V²f / 2g  + hf

therefore :  hi = ( 12.3 )² / 2 * 9.81  + 4.1

                       = 151.29 / 19.62  + 4.1

                       = 11.811 m

Hence we can conclude that The height from which the engineer needs to release the ball is :  11.811 m

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Attached below is the missing image related to your question

Answer:

Acceleration = Final velocity - initial velocity / time take

65-35=30 , 30/5=6

Acceleration = 6m s-2

Explanation:

x(t)=voₓ.t = vo cos α.t

the greater the initial speed, the further the distance obtained

The horizontal distance traveled by a projectile (also known as the range of the projectile) is determined by the initial speed of the projectile, as well as other factors such as the angle at which it is launched and the gravitational acceleration acting on it.

A projectile is an object that is projected into the air and follows a parabolic path under the influence of gravity. Examples of projectiles include balls thrown or kicked in sports, bullets fired from guns, and rocks or other objects that are thrown or dropped.

To determine the effect of the initial speed on the horizontal distance traveled by a projectile, you can use the following formula:

[tex]Range = (Initial speed)^2 * sin(2 * Launch angle) / gravitational acceleration[/tex]

This formula shows that the range of a projectile is directly proportional to the initial speed of the projectile squared, and is also affected by the launch angle and gravitational acceleration.

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Answer:

D

Explanation:

Weight and friction are paired as vectors

Answer:

1. Strike one tuning fork on the edge of the table to make it vibrate.

2.  Hold the vibrating tuning fork right beside the other one.

3. The second tuning fork will begin to vibrate at the same rate as the first one.

Explanation:

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Answer:

P = 0.7 [kg*m/s]

Explanation:

The amount of linear momentum is defined as the product of mass by Velocity. This way you have the following equation:

P = m*v

P = momentum [kg*m/s]

m = mass = 140 [g] = 0.140 [kg]

v = velocity = 5 [m/s]

P = 0.140*5

P = 0.7 [kg*m/s]

Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

Answer:

50N

The table is managing to keep the dog up, the dog is not moving up or down so the force that the table applies to the dog must be equal to the dogs weight - I draw this conclusion from Newton's 3rd law.

W= mg

W = 5 × 9.8

W = 49N

round to.one significant figure = 50N

The force that the table applies on the dog is required.

The force that the table applies to the dog is [tex]10\ \text{N}[/tex]

m = Mass of dog = 5 kg

g = Acceleration due to gravity is assumed to be [tex]10\ \text{m/s}^2[/tex]

Force is given by

[tex]F=mg[/tex]

[tex]\Rightarrow F=5\times 10[/tex]

[tex]\Rightarrow F=10\ \text{N}[/tex]

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Answer:

Food and oxygen would eventually become major problems.

We would need HUGE banks of photocells which would be used to charge batteries (or some other energy storing system, liked pumped water)

The batteries would power banks of LED "grow lights" in greenhouses to provide us with food and oxygen.

This would have to be done on a monumental scale, largely to replace the huge quantities of oxygen generated by life in the oceans.

Answer:

True

Hope it will be

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Answer:

8.57 m

Explanation:

To solve the problem, we have to decompose the two vectors along the two directions first:Vector A:- x component: Ax = +9.66 m- y compoment: Ay = 0 (the vector lies along the x-axis)Vector B:- x component: - y component: So now we can find the sum of the two vectors by adding the components along each axis:And the magnitude of the sum is given by Pythagorean theorem:

Answer:

They have the same amount of energy

Explanation:

Electrons are said to be the subatomic particles that move around the nucleus of an atom. These electrons are negatively charged particles that are seen to be quite smaller than the nucleus of an atom.  

The electron shells of these atoms are usually being filled from the inside out with the low-energy shells closer to the nucleus being filled before they can go into the much higher-energy shells that are a bit out

The electrons in the same shell have the same amount of energy and the same principal energy level. The correct answer is (A).

An atom's fundamental energy level, commonly referred to as the energy "shell," is the same for electrons in the same shell. The major energy level, which also controls the electron's typical separation from the nucleus, closely correlates to the electron's energy level.

Electrons within the same shell have the same energy level, although they may have different sublevels or orbitals within that shell.

Therefore, The electrons in the same shell have the same amount of energy and the same principal energy level. The correct answer is (A).

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Which force is represented by the arrow at A?

Let us understand the situation first and then we will understand which type of force is represented by arrow A

Answer:

1650 meters

145=75+a.15

Answer:

1400 m

Explanation:

Given:

v₀ = 175 m/s

v = 105 m/s

t = 10.0 s

Find: Δx

Δx = ½ (v + v₀) t

Δx = ½ (105 m/s + 175 m/s) (10.0 s)

Δx = 1400 m

The mass of the helicopter is 3402 kg.

Kinetic energy is the energy possessed by a body as a result of its motion.

The kinetic energy of a body depends on its mass and velocity as shown below:

[tex]Kinetic\:energy = \frac{1}{2}mass*velocity[/tex]

[tex]mass = \frac{2KE}{{velocity}^{2} }[/tex]

velocity = 4.00x 10^2 km/h = 111.11 m/s

kinetic energy = 2.10 x 10^7J

[tex]mass = \frac{2 \times 2.1 \times {10}^{7} }{{111.11}^{2}} = 3402 \: kg[/tex]

Therefore, the mass of the helicopter is 3402 kg.

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Answer:

Acceleration is the rate of change of velocity. Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing. Comment on robshowsides's post “Speed is the magnitude of velocity.

Explanation:

hope it helped tee hee

Answer:

Displacement = 16.55 km

Explanation:

The straight line displacement can be found by finding the resultant of both the displacements. The displacements given to us are 15 km north and 7 km west.  Since, west and north directions are perpendicular to each other. Therefore, the displacements will also be perpendicular and they can be modelled as the rectangular components of resultant straight line displacement. So, the resultant straight line displacement can be found by using Pythagorean Theorem:

Displacement = √[(15 km)² + (7 km)²]

Displacement = 16.55 km

Hence, his straight line displacement during this part of trip will be 16.55 km

Answer:

Before coming into any conclusion, first we have to understand radiation and conduction.

Radiation is the type of mode of transmission of thermal energy in which the radiations travels through space or vacuum without heating the intervening medium.

On the other hand, conduction is the mode of transmission of heat from one body to another body which are in contact with each other or hotter part to the colder parts of a body without any transport of material particle.

Heat always flows from a body at higher temperature to a body at a lower temperature in absence of external work done. The reverse is not possible in normal case.

Heat is flowing  from hot body to cold body, and there is no direct contact between the body. It explains correctly the mode of transmission of thermal energy through the process of radiations.

For a steel piano wire, 0.721 m long has a cross-sectional area of 0.00633 cm2.  is mathematically given as

de=9.624723*10^{-4}m

Generally, the equation for the Hooks law  is mathematically given as

F/A=Yde/e

Therefore

dl=fe/Ay

de=\frac{169*0.721}{0.00633*10^{-4}*2 x 10^{11} }

de=9.624723*10^{-4}

In conclusion, the wire stretch

de=9.624723*10^{-4}m

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Note : Please discard your other answers as they are incorrect. I have personally solved this problem and have attached the appropriate image.

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Stay safe!

- Robert

Answer:

Elements: Hydrogen, Helium, Oxygen, Neon, Nitrogen

Mixtures: Smog, Mud, Cement, Gunpowder, Gasoline

Compounds: Water, Glucose, Carbon monoxide, Carbon dioxide, Methane

Explanation:

Element: any substance that cannot be separated into different substances by ordinary chemical methods.

Mixture: a material made up of two or more different chemical substances which are not chemically bonded.

Compounds: a distinct substance formed by chemical union of two or more ingredients in definite proportion by weight a new antibiotic compound.

Answer:

21.5 i did the assesment

Explanation:

[tex]\bold{\huge{\underline{ Solution }}}[/tex]

Here, we have

We know that,

That is,

[tex]\bold{\red{ C = }}{\bold{\red{\dfrac{ Q}{m{\delta}T}}}}[/tex]

So,

[tex]\sf{{\delta} T = }{\sf{\dfrac{ Q}{Cm}}}[/tex]

Subsitute the required values,

[tex]\sf{ T2 - 10 = }{\sf{\dfrac{ 7700}{3{\times}4186}}}[/tex]

[tex]\sf{ T2 - 10 = }{\sf{\dfrac{ 7700}{12558}}}[/tex]

[tex]\sf{ T2 - 10 = }{\sf{\cancel{\dfrac{ 7700}{12558}}}}[/tex]

[tex]\sf{ T2 - 10 = 0.61 }[/tex]

[tex]\sf{ T2 = 0.61 + 10 }[/tex]

[tex]\bold{ T2 = 10.61 {\degree} C}[/tex]

Hence, The final temperature of 3kg if 7,700 J of heat supplied is 10.61 °C

Answer:

The answer is see the person above is correct They must lose enough other kinetic energy so that the attractions between them hold in place has been vibrate

Explanation:Got it correct

For a substance to change from a liquid to a solid, the particles must lose enough of their kinetic energy so that the attractions between them hold in place as they vibrate. Thus, the correct option is C.

Kinetic energy is the energy which an object has because of its motion. If we want to accelerate an object, then it is required to apply a certain amount of force. Applying a force requires us to perform work. After work has been done on the object, then the energy has been transferred to the object, and the object will be moving with a new constant speed and no acceleration.

For a substance to change from a liquid to a solid, the particles must lose enough of their kinetic energy so that the attractions between them hold in place as they vibrate.

Therefore, the correct option is C.

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Answer:

The expectation that a larger object will feel heavy is presumably caused by the fact that larger objects generally contain more material and consequently have a larger mass than smaller objects. When, in contrast, the two objects have the same mass, an illusory heaviness difference occurs.

Explanation:

sorry if this is wrong

Answer:

PE=mgh

 Where; m is the mass

              g is the gravitational force.

               h is the height.  

   the mass is 1kg, the acceleration due to gravity has a constant value of 10ms² . And the height is 3m.

mgh= 1 x 10 x 3 = 30Joules

Answer:

E = K Q / R^2         electric field due to charge Q

Q = E * R^2 / K = 300 N / C * (10^5)^2 m^2 / (9.0E9 nt-m^2/C^2)

Q = 333 C