what is the best matral or mechaniazime to use in a egg drop form 30 feet

If you could hear it at all, it would sound very soft.

Answer:

molecules at higher teperature have higher speed & energy.

Explanation:

the higher they are the more it effects

Explanation:

As the source of sound waves approaches you the sound waves get closer together, increasing their frequency and the pitch of the sound. The opposite happens when the source of sound waves moves away from you

Answer:

A car weighing 2500 kg and travelling at 15 m/s stops at a distance of 25 m deceleration uniformly. What is the force exerted on it by the brakes?

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5 Answers

Naren Nagarajan

, Cambridge Examinations Officer at Kasiga School, Dehradun (2008-present)

Answered 3 years ago · Author has 1.1K answers and 1.9M answer views

(a) W= Fd ( energy = force x distance )

(b) KE = .5 m v*v ( Kinetic energy of the car )

KE =0.5 * 2500 * 225KE =281250 Joules

Using (a) , Reducing kinetic energy to zero over 25 m

281250 = F * 25

F = 281250 /25

F = 11250 N

To check or use a different method …..

v^2 = u^2 +2as ( Third equation of motion )

2as = v^2 -u^2 ( v = 0 and U = 15 )

as = -225/2

a = - 225/2 * 25

a= - 225/50

a= - 4.5 m sec ^ -2

F = ma

F = 2500 * - 4.5

F = - 11250 N ( the negative sign indicates that the force is opposite in direction to the motion of the car )

The answer is correct since both values for F are equal.

Answer:

4 independent of l and area of cross section

Option D

As

Answer:

13.8m/s

Explanation:

Speed = Distance/Time

Since the object moved 138m over 10s we just substitute it in.

Speed = 138/10s

Speed = 13.8m/s on Average

Answer:

My aunt died and I am felling down today

Answer: Seatbelts relate to Newton's first law of motion because in the case of a car accident, someone in the car would continue forward until they hit somethng else. A seat belt will help prevent this because it will push back on you (action-reaction force).

Explanation:

Answer:

They are inversely proportional with each other. [tex]R[/tex] ∝ [tex]\frac{1}{I}[/tex]

Explanation:

By the equation V=IR, assume V is constant.

Since I and R are on the same side,

if I increase, R decreases, or the vice versa.

Answer:

The bigger balloon will have a larger area and would experience a greater buoyant force exerted on it which would make it even lighter than a smaller balloon and will have higher payload capacity than a smaller one.

An ampere (AM-pir), or amp

Answer:

C

Explanation:

because it's new chemical substances

The angle the string makes with the vertical is : 34.6°

Given data :

mass of rubber stopper ( m ) = 45 g

Radius ( r ) = 2.9 m

Time to complete one revolution ( T ) = 4.1 secs

applying the formula below

Tan ∅ = [tex]\frac{mw^2r}{mg}[/tex] --- ( 1 )

cancel out m from equation ( 1  )

Tan ∅ = [tex]\frac{w^2r}{g}[/tex]    ----- ( 2 )

where ; w = [tex]\frac{2\pi }{T}[/tex]  

Therefore equation ( 2 ) becomes

Tan ∅ = [tex]\frac{4\pi ^2r}{T^2g}[/tex]   --- ( 3 )

where ; r = 2.9 m, T = 4.1 secs , g = 9.8

Insert values into equation ( 3 )

Tan ∅ = 0.69

      ∅ = Tan ( 0.69 )

         = 34.6°

Hence we can conclude that The angle the string makes with the vertical is : 34.6°.

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An ohmic resistor is a resistor that obeys Ohm's law V = IR (voltage = current x resistance). Therefore, if the voltage in such element is increased by n number of times, by the same number n has to increase the current.

[tex] \\ [/tex]

hope it helps:)

Ohmic resistors are materials that obeys ohms law.

An ohmic resistor is a material that obey's ohms law. This material does not allow passage of electricity through it.

V = IR

where;

Thus, ohmic resistors are materials that obeys ohms law.

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The intermolecular force is the closest representation to the interaction between the balloon and the water is Dipole-Dipole interaction.

What is  intermolecular force?

The intermolecular force is the force of attraction between atoms, molecules, and ions when they are placed close to each other.

This force denotes the miscibility of polar solvents and their interacting characteristics like melting points and boiling points.

Thus, the intermolecular force is the closest representation to the interaction between the balloon and the water is Dipole-Dipole interaction.

Learn more about  intermolecular force.

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Answer:

2.0 N is the answer

Explanation:

Hope this helps ;D

Answer:

P V = N R T    is the ideal gas equation

P2 / P1 = T2 / T1

The pressure will increase.

Answer:

a reflected sound wave completely bounces off an object and diffraction occurs when there is an opening in a wall and only the waves that can fit through the wall go and then the waves start to expand again after going through the hole.

Explanation:

The velocity of the fourth piece after the explosion is 118.5 m/s at 14.7⁰ east of north.

The principle of conservation of linear momentum states that the sum of the initial momentum is equal to sum of final momentum.

Initial momentum of the bomb before explosion is equal to the final momentum of pieces of bomb after explosion.

Pi = Pf

0 = P₁ + P₂ + P₃ + P₄

0 = mv₁ + mv₂ + mv₃ + mv₄

0 = v₁ + v₂ + v₃ + v₄

Consider x-y plane for the velocity of the piece of bomb;

[tex]0 = (v_1x + v_1y) + (v_2x + v_2_y) + (v_3x + v_3_y) + (v_4_x + v_4_y)\\\\0 = (0 - 50y) + (-80x + 0) + (-40cos30x + 40sin30y) + (v_4_x + v_4_y)\\\\0 = -50y -80x - 34.64x + 20y + v_4_x + v_4_y\\\\0 = -30y - 114.64x + v_4_x + v_4_y \\\\v_4_x + v_4_y = 114.64x + 30y\\\\|v_4| = \sqrt{114.64^2 + 30^2} \\\\|v_4| = 118.5 \ m/s\\\\tan(\theta ) = \frac{30}{114.64} \\\\tan(\theta) = 0.262\\\\\theta = tan^{-1} (0.262)\\\\\theta= 14.7 \ ^0[/tex]

Thus, the velocity of the fourth piece is 118.5 m/s at 14.7⁰ east of north.

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The metal ball lost energy while the putty ball gained energy.

Momentum is the product of mass and velocity of the body. We must note that momentum before collision is equal to momentum after collision.

1) Kinetic energy before collision = 1/2mv^2 = 0.5 * 6 * 4 = 12 J

2) kinetic energy after collision = 0.5 * 6 *  2= 6 J

3) Kinetic energy of putty ball = 0.5 * 6 *  2= 6 J

4) Energy lost by the metal ball = 12 J -  6 J = 6 J

5) Energy gained by the putty ball = 6 J - 0J = 6 J

6) The rest of the energy was converted to heat after the collision.

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The X and Y components of the force are 90.63 Newton and 42.26 Newton respectively.

Given the following data:

To determine the X and Y components of the force:

Mathematically, the horizontal component of a force is given by this formula:

[tex]F_x = Fcos \theta\\\\F_x =100 \times cos25\\\\F_x =100 \times 0.9063[/tex]

Fx = 90.63 Newton.

Mathematically, the vertical component of a force is given by this formula:

[tex]F_y = Fsin \theta\\\\F_y =100 \times sin25\\\\F_y =100 \times 0.4226[/tex]

Fy = 42.26 Newton.

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Explanation:

F =(frac{1}{4{pi}{varepsilon}_o}) x (frac {q_1q_2}{r^2})

F =(frac {5 {times} 10 {times} 8 {times} 10}{0.002 {times} 0.002}) x 9 x 10

F = 900N

Answer and Explanation:

The law of conversation of energy states that energy cannot be created or destroyed. The pendulum slows down and stops eventually not because the kinetic energy is destroyed, but it is transferred into sound and heat energy instead because there is air resistance and friction.

Kinetic energy => Gravitational potential energy (Loop but some energy transferring to heat and sound each time)

Answer:

Explanation:

Work = 1.31 × 10³ = 1310

F = W/D = 1310/76.2

≈ 17.19N

An amount of cement is lifted 76.2 m by arcane, which exerts a force on the cement that is slightly larger than the weight of the cement. If the network done on the cement is 1.31 × 103 J, 17.19N is the magnitude of the net force exerted on the cement.

In mechanics, force is defined as any action that seeks to sustain or modify the movement of a body or even to deform it. The idea of force is frequently defined in terms of Isaac Newton's three laws of motion, which are laid forward by book Principia Mathematica (1687).

Newton's first principle is that a body at rest and moving uniformly inside a single direction will continue in that condition unless another force is exerted to it.

Work = 1.31 × 10³ = 1310J

Force = Work/Distance

          = 1310/76.2

          ≈ 17.19N

Therefore,  17.19N is the magnitude of the net force exerted on the cement.

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Answer:

Horizontal translation of six units

Explanation:

Answer:

electromagnetic radiation

Answer:

A student is pushing a = 35 kg desk across a floor at a constant speed of 1 = 4 m/s. How

much work, to the nearest whole joule, must the student do on the desk to change the speed to

2 = 6 m/s?

Solution:

Work done = change of energy

=

2

2

2

−

1

2

2

=

35 × 36

2

−

35 × 16

2

= 630 − 280 = 350 J

Answer = 350 J

pls give me brainlieste

Answer: 40J

Explanation:

Gravitational potential energy is defined as the mass of the object, multiplied by the acceleration due to gravity, and the height from your arbitrary reference point. If we assume that the floor has a gravitational potential of zero, then the gravitational potential of the book on the shelf would be:

[tex]U=mgh[/tex]

We were given the weight of the book, not the mass. In order to find the mass of the book, we need to divide the weight by the acceleration of gravity. We have that:

[tex]Mass=Weight/Gravity[/tex]

[tex]Mass=16N/9.8m/s^2[/tex]

[tex]Mass=1.63kg[/tex]

Plug everything into the gravitational potential formula to get:

[tex]U=(1.63kg)*(9.8m/s^2)*(2.5m)[/tex]

[tex]U=40J[/tex]

The gravitational potential energy of the book placed 2.5 m above from the ground is 40 joules.

The energy of the body due to its position with reference to some other body is called the potential energy of the two - body system.

Given is an object whose weight is 16 N placed on a shelf that is 2.5 m from the ground.

The weight of the book is -

W = mg = 16 N

The gravitational potential energy of the book will be -

E = mgh = 16 x 2.5 = 40 joules

Therefore, the gravitational potential energy of the book placed 2.5 m above from the ground is 40 joules.

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