A baseball is tossed straight up in the air. The table shows the height and velocity of the ball at different times as it moves through the air.

Time in Air (seconds) Height of Ball Above Ground (feet) Velocity

(feet per second)

0.00 4 32

0.25 11 24

0.50 16 16

0.75 19 8

1.00 20 0

1.25 19 −8

1.50 16 −16

1.75 11 −24

2.00 4 −32

Which statement is true about the kinetic energy of the baseball at the moment it reaches its maximum height?


The baseball's kinetic energy is less than zero at that instant.


At that moment, all the baseball's kinetic energy has been lost as heat to the atmosphere.


The baseball's kinetic energy is greater than zero at that instant.


✅ At that moment, all the baseball's kinetic energy has been converted to potential energy. (correct answer)

T = 2π√(L/g)

For earth , g ~ 10

18.9 = 2×3.14 √(L/g)

9 = L/g

L = 90 metres

Answer:

88m

Explanation:

T=2π*\(\sqrt{L/g}\)-->Τ/2π=\(\sqrt{L/g}\)-->18.9/2π=\(\sqrt{L/g}\)-->3=\(\sqrt{L/g}\)-->3^2=L/g-->9=L/9.8

so L=9*9.8-->L≈88m

In your business plan, the target market section should clearly identify both your primary and secondary market(s). The market analysis is basically the target market section of your business plan. It is a thorough examination of the ideal people to whom you intend to sell your products or services.

The diffusion coefficient based on the provided data is 3.651 x 10^(-5) cm^2/s. (Option C)

The diffusion coefficient refers to the ratio of flux density to the negative of the concentration gradient in direction of diffusion. The diffusion coefficient in solids at different temperatures is generally found to be well predicted by the Arrhenius equation:

D=Do exp (-E/RT)

Where D is the diffusion coefficient (in m2/s), Do is the maximal diffusion coefficient (at infinite temperature; in m2/s), E is the activation energy for diffusion (in J/mol), T is the absolute temperature (in K), and R ≈ 8.31446 J/(mol⋅K) is the universal gas constant.

In the given case,

Do = 0.0047 cm/s = 4.7 x 10^-5 m/s

E = 18300 cal/mol = 76567.2 J/mol

T = 700°C = 973.15 K

Hence,

D=(4.7 x 10^(-5)) exp (-76567.2/(8.31446*973.15))

D=(4.7 x 10^(-5)) exp (-9.463)

D=3.651 x 10^(-9) m^2/s or 3.651 x 10^(-5) cm^2/s

Note: The question is incomplete.  The complete question probably is: What is the diffusion coefficient (D) for iron at 700°C, with an activation energy (E) of 18,300 cal/mol, and Do = 0.0047cm/s. A) 2.43E3 cm2/s B) 9.08E-9 cm2/s C) 3.64E-5 cm2/s D) 60.66 cm2/s.

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The distance travelled by the car after the brake was applied is 125 m.

The distance travelled by the car is calculated by applying the following kinematic equation as shown below.

Mathematically, the distance travelled by the car at the given average speed is calculated as;

s = [ ( v + u ) / 2 ] t

where;

The distance travelled by the car is calculated as;

s = [ ( 0 + 25 m/s ) / 2 ] ( 10 s )

s = 125 m

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The correct answer isThe astronaut's b) mass remains the same.

The mass of an object remains constant regardless of its position or distance from the center of the Earth. Mass is a measure of the amount of matter in an object and is an intrinsic property. It does not change with the position or location of the object.

On the other hand, the weight of an object can vary depending on its distance from the center of the Earth. Weight is the force experienced by an object due to gravity and is dependent on the mass of the object and the gravitational acceleration at its location.

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As an astronaunt travels from the surface of the earth to a postion that is four times

as far away from the center of the earth, the astronaut's

a) mass decreases

b)

mass remains the same

c) weight increases

d) weight remains the same

The time it would take it to reach Earth if the Sun remained at its current position is 978,349.5 years.

The time of motion of the giant molecular cloud is the time take for the giant molecular cloud to reach the earth.

Mathematically, the time taken for the giant molecular cloud to reach the earth is given as;

time = distance / speed

where;

time of motion = (6.48 x 10¹⁴ km) / (21 km/s)

time of motion = 3.086 x 10¹³ seconds = 978,349.5 years.

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The time the wheel would take for the disk with twice the radius and twice the mass to come to a stop would be 480 seconds.

This is because the moment of inertia, which is the measure of an object's resistance to changes in its rotation rate, depends on both the mass and the radius of the disk. Specifically, the moment of inertia of a solid disk is given by

I = 1/2 * mass * radius^2.

Since the disk in question has twice the mass and twice the radius, its moment of inertia will be 8 times greater than the original disk. This means that it will take 8 times longer for the disk to come to a stop under the same frictional force.

Therefore, the time it would take for the disk with twice the radius and twice the mass to come to a stop is 8 * 60 seconds = 480 seconds.

Therefore, the time the wheel would take to come to a stop from the same initial rotational speed If the disk had twice the radius and twice the mass is 480 seconds.

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Answer:The direction a wave propagates is perpendicular to the direction it oscillates for transverse waves. A wave does not move mass in the direction of propagation; it transfers energy.

Explanation:

Answer:

The energy that is changing during a phase change is potential energy. During a phase change, the heat added (PE increases) or released (PE decreases) will allow the molecules to move apart or come together. Heat absorbed causes the molecules to move farther apart by overcoming the intermolecular forces of attraction.

To find the mass in kilograms, you need to know the object's weight in newtons and the acceleration due to gravity. The formula for finding mass is mass = weight / acceleration due to gravity. So if you have an object with a weight of 100 N and the acceleration due to gravity is 9.8 m/s^2, the mass would be 10.204 kg.

The mass of the block is 0.025 kg or 25 g, when the spring has k = 28 N/m, and compresses 0.11 m before bringing the block to rest.

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First we must calculate the current power the curling iron can handle:

where

I = current

V = tension

Then:

For the hair dryer we get:

Lets suppose all appliances are working in parallel together. The total current must be:

As we can see the appliances are drawning all current from the outlet fused.

Answer: the current that can be safely drawn from the outlet fused is zero.

The evaluation of the capacitor (in series) network is as follows;

Part A

Q = 3.2 μC

Part B

Q₁ = 3.2 μC

Part C

Q₂ = 3.2 μC

Part D

U = 76.8 μJ

Part E

U₁ = 34 2/15 μJ

Part F

U₂ = 53 1/3 μJ

Part G

V₁ = 21 1/3 V

Part H

V₂ = 26 2/3 V

A capacitor consists of pairs of conductors separated by insulators. Capacitors are used to store electric charge.

The specified parameters are;

The voltage across ab = 48 V

The capacitance of the first capacitor, C₁ = 150 nF

Capacitance of the second capacitor, C₂ = 120 nF

Part A

The total charge in a capacitor network can be found as follows;

\(C_{eq} = \left(\dfrac{1}{150} + \dfrac{1}{120} \right)^{-1} nF = \left(\dfrac{3}{200} \right)^{-1}nF\)

\(C_{eq} =\left(\dfrac{3}{200} \right)^{-1}nF=66\frac{2}{3} \, nF\)

\(Q_{eq} = C_{eq}\times V_{ab}\)

Therefore;

\(Q_{eq}\) = 66 2/3 nF × 48 V = 3,200 × 10⁻⁹ C = 3.2 μC

Part B

The charge in the 150 nF capacitor is obtained from the formula for the charge in a capacitor; Q = C × V as follows;

Q = C₁V₁ = C₂V₂

The charge in the capacitors, C₁ and C₂ are the same as the total charge of 3.2 μC

The charge, Q₁ on the 150 nF capacitor, C₁ is therefore, 3.2 nC

Part C

The capacitors, C₁ and C₂ are in series, therefore, the charge in each capacitor is equivalent to the charge in the circuit, which is 3.2 μC.

Therefore, the charge, Q₂, in the 120 nF capacitor, C₂ is 3.2 μC

Q₂ = 3.2 μF

Part D

The total energy stored in the network can be obtained using the formula;

U = (1/2)·C·V²

Where;

U = The energy in the capacitor

C = The equivalent capacitance of the network = 66 2/3 nF

V = The voltage

Therefore;

\(U = \dfrac{1}{2} \times C_{eq}\times V^2\)

\(U = \dfrac{1}{2} \times 66\frac{2}{3} \times 10^{-9}\times 48^2 = 76.8\)

Part E

The energy stored in the 150 nF capacitor is found as follows;

\(Q_{eq}\) = Q₁ = C₁ × V₁

V₁ = \(Q_{eq}\) ÷ C₁

Therefore;

V₁ = 3.2 μC ÷ 150 nF = \(21\frac{1}{3}\) V

U₁ = 0.5×C₁×V₁²

Part F

The energy stored in the 120 nF capacitor, U₂, can be found as follows;

V₂ = 3.2 μC ÷ 120 nF = \(26\frac{2}{3}\) V

U₂ = 0.5 × 150 nF × \(\left(26\frac{2}{3} \, V\right)^2\) = \(53\frac{1}{3}\, \mathrm{ \mu J}\)

Part G;

The potential difference across the 150 nF, obtained in Part E, is 21 1/3 V

Part H

The potential difference across the 120 nF, obtained in part F, is 26 2/3 V

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The medium in which electromagnetic waves and mechanical waves travel is one of their primary distinctions. Light and other electromagnetic waves, including radio waves, can move through void space without the aid of a physical medium.

They may move through vacuum, air, or other materials and are made up of oscillating electric and magnetic fields. The propagation of mechanical waves, such as sound or water waves, on the other hand, depends on a physical medium.

To transport energy, they rely on particle interactions and displacements in the medium. Since mechanical waves need a physical medium to carry their energy, they cannot move through a vacuum.

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If a person swims at a constant speed of 1 meter per second, than the linear function will be used to model the distance travelled by the swimmer.

The parent function is "the principal's of ice"

A linear function is a function that forms a straight line on a graph. It is generally a polynomial function whose degree is at most 1 or 0. Although linear functions are also represented in terms of calculus and linear algebra.

Here Y-axis represents Distance and X-axis represents Time.

Also speed is the rate of change of distance with respect to time i.e. distance is changing linearly with time

Mathematically it is  \(Speed = \frac{distance}{time}\).

Change in Distance = Change in time and hence speed is constant.

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Answer:

potential is at maximum

kinetic energy is zero

Answer:

a) a = 2.35 m/s^2

Explanation:

(a) In order to calculate the magnitude of the acceleration of the ball, you use the following formula, for the position of the ball:

\(x=v_ot+\frac{1}{2}at^2\)     (1)

x: position of the ball after t seconds = 87 m

t: time  = 8.6 s

a: acceleration of the ball = ?

vo: initial velocity of the ball = 0 m/s

You solve the equation (1) for a:

\(x=0+\frac{1}{2}at^2\\\\a=\frac{2x}{t^2}\)

You replace the values of the parameters in the previous equation:

\(a=\frac{2(87m)}{(8.6s)^2}=2.35\frac{m}{s^2}\)

The acceleration of the ball is 2.35 m/s^2

The distance travelled in that month is 870.92 miles

We'll begin by calculating the circumference of the tyre. This can be obatined as follow:

C = 2πr

C = 2 × 3.14 × 13

C = 81.64 in

63360 inches = 1 mile

Therefore,

81.64 inches = (81.64 inches × 1 mile) / 63360 inches

81.64 inches = 0.00129 mile

Distance = number × circumference

Distance = 0.00129 × 675135

Distance = 870.92 miles

Thus, the distance travelled in that month is 870.92 miles

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Answer:

The half-life of a radioactive substance is the amount of time it takes for half of the initial amount of the substance to decay. In this case, the initial number of atoms decayed to half of the initial number after 128 days. So the half-life of the radioactive substance is 128 days.

A potassium ion can be described as it is a positive ion that has one less valence electron than a neutral potassium atom. Therefore, option (C) is correct.

An ion can be described as a chemical specie that exhibits a positive or negative charge. The term ‘ion’ can be used to refer to atoms or molecules with non-zero charges associated with them.

Therefore, all ions possess either greater electrons than protons in their atomic structures or greater protons than electrons. If the protons are greater than electrons hold a net positive charge and are generally referred to as cations.

The electronic configuration of the Potassium is 1s²2s²2p⁶3s²3p⁶4s¹. As the Potassium atom donates one electron in its valence shell it becomes cation K⁺.

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Answer:

C) It is a negative ion that has one more valence electron than a neutral bromine atom.

Explanation:

A bromide is a synthetic composite including a bromide ion or ligand. Potassium bromide (KBr) is a salt, usually selected as an anticonvulsant and a drug in the late 19th and early 20th centuries, with over the stand value increasing to 1975 in the US. Potassium bromide is applied as a veterinary drug, as an antiepileptic medicine for dogs.

Hope this helps! <3

Explanation:

The mechanical energy can be expressed as kinetic and potential energy, given by the equation;

ME=KE+PE

but since the car isn't elevated off the ground nor is it subjected to the restoring force of a spring, we can then say PE=0

ME=KE

The equation of KE=0.5mv²

ME=0.5mv²

32 000=0.5(1600)v²

\(v {}^{2} = \frac{32 \: 000}{1600 \times 0.5} \)

\(v {}^{2} = \frac{32 \: 000}{800} \)

\( {v}^{2} = 40\)

\(v = \sqrt{40} = 6.324\)

v=6.324 m/s :)

Answer:

not using it too much and getting addicted

Explanation:

Answer:

yes it is possible

Explanation:

if the body is travelling with uniform speed in a circular track its speed remains the same but the velocity is non-uniform as the direction of the body is changing every time.

eg: a body in uniform circular motion has constant speed but its velocity changes at every point during the course of motion. Whenever, the direction changes, velcoity changes.

Answer:

Explanation:

acceleration of the object, a = 4 m/s²

          distance covered, d₁ = 2m and d₂ = 8m

To Find: average velocity, V.

Solution:

To calculate V, the formula used:

v² - u² = 2 as                                 ⇒ Third Law of Motion Equation

here, v is the final velocity

      u is the initial velocity, i.e. u =0 m/s

      a is the acceleration

      s is the distance covered

Average velocity, V = (velocity at d₁ + velocity at d₂) / 2

V = (v₁ + v₂)/ 2                                                    ⇒ 1

Applying the 3rd law of motion equation formula:

For v₁ :

v₁ ² - u² =  2 x a x d₁

v₁ ² - 0²  = 2 x 4 x 2

v₁ ² = 4 x 4

   = 16

v₁  = √16

   = 4

v₁  = 4 m/s

For v₁ :

v₂² - u² =  2 x a x d₂

v₂ ² - 0²  = 2 x 4 x 8

v₂ ² = 8 x 8

     = 64

v₂    = √64

      = 8

v₂     = 8 m/s

Putting the value of v₁ and v₂ in equation 1:

V = 4 + 8 / 2

  = 12 / 2

  = 6

V  = 6 m/s

Hence, the average speed of the object is 6 m/s.

Explanation:

Supernovae play a fundamental role in a great cosmic recycling program. We believe that almost all of the elements in the Universe that are heavier than hydrogen and helium are created either in the centres of stars during their lifetimes or in the supernova explosions that mark the demise of larger stars.

Answer: WORK

Explanation:

Answer:

work

Explanation:

got it right on edge:p

The acceleration of an hawk flying at 4m/s but later accelerates at 8m/s in 0.5s is 8m/s².

The acceleration of a moving body can be calculated using the following expression:

a = v - u/t

Where;

According to this question;

a = 8 - 4/0.5

a = 4/0.5

a = 8m/s²

Therefore, the acceleration of an hawk flying at 4m/s but later accelerates at 8m/s in 0.5s is 8m/s².

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Answer:

The limitations of sending information using electromagnetic waves is that when the electromagnetic waves move outward in all directions, wave transmitters need to be focused to transmit their signals to a single specified location.

Answer: 10 kg

Explanation:

Using dimensional analysis, we can find the unit of mass in the given system:

Force (F) = mass (m) × acceleration (a)

In the given system, the unit of force is 100 N, which can be written as:

100 N = (100 kg · m/s²) × (10 m/s²)

Thus, we can see that the unit of force is equivalent to 100 kg·m/s².

Now, we can rearrange the equation to solve for mass (m):

m = F/a

Substituting the units:

m = (100 kg·m/s²) / (10 m/s²)

m = 10 kg

Therefore, the unit of mass in the given system is 10 kg.